Merge tag 'pwm/for-6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux

Pull pwm updates from Uwe Kleine-König:
 "Apart from the usual mix of new drivers (pwm-argon-fan-hat), adding
  support for variants to existing drivers, minor improvements to both
  drivers and docs, device tree documenation updates, the noteworthy
  changes are:

   - A hwmon companion driver to pwm-mc33xs2410 living in drivers/hwmon
     and acked by Guenter Roeck

   - chardev support for PWM devices. This leverages atomic PWM updates
     to userspace and at the same time simplifies and accelerates PWM
     configuration changes"

* tag 'pwm/for-6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux: (35 commits)
  pwm: raspberrypi-poe: Fix spelling mistake "Firwmware" -> "Firmware"
  hwmon: add support for MC33XS2410 hardware monitoring
  pwm: mc33xs2410: add hwmon support
  pwm: img: Remove redundant pm_runtime_mark_last_busy() calls
  pwm: Expose PWM_WFHWSIZE in public header
  dt-bindings: pwm: Convert lpc32xx-pwm.txt to yaml format
  docs: pwm: Adapt Locking paragraph to reality
  pwm: twl-led: Drop driver local locking
  pwm: sun4i: Drop driver local locking
  pwm: sti: Drop driver local locking
  pwm: microchip-core: Drop driver local locking
  pwm: lpc18xx-sct: Drop driver local locking
  pwm: fsl-ftm: Drop driver local locking
  pwm: clps711x: Drop driver local locking
  pwm: atmel: Drop driver local locking
  pwm: argon-fan-hat: Add Argon40 Fan HAT support
  dt-bindings: pwm: argon40,fan-hat: Document Argon40 Fan HAT
  dt-bindings: vendor-prefixes: Document Argon40
  pwm: pwm-mediatek: Add support for PWM IP V3.0.2 in MT6991/MT8196
  pwm: pwm-mediatek: Pass PWM_CK_26M_SEL from platform data
  ...

41 files changed, 1227 insertions, 306 deletions

diff --git a/Documentation/devicetree/bindings/pwm/adi,axi-pwmgen.yaml b/Documentation/devicetree/bindings/pwm/adi,axi-pwmgen.yaml
index 5575c58357d6..e4c2d5186ded 100644
--- a/Documentation/devicetree/bindings/pwm/adi,axi-pwmgen.yaml
+++ b/Documentation/devicetree/bindings/pwm/adi,axi-pwmgen.yaml
@@ -14,7 +14,7 @@ description:
   The Analog Devices AXI PWM generator can generate PWM signals
   with variable pulse width and period.
 
-  https://wiki.analog.com/resources/fpga/docs/axi_pwm_gen
+  https://analogdevicesinc.github.io/hdl/library/axi_pwm_gen/index.html
 
 allOf:
   - $ref: pwm.yaml#
diff --git a/Documentation/devicetree/bindings/pwm/argon40,fan-hat.yaml b/Documentation/devicetree/bindings/pwm/argon40,fan-hat.yaml
new file mode 100644
index 000000000000..7dbc7c2cd802
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/argon40,fan-hat.yaml
@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pwm/argon40,fan-hat.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Argon40 Fan HAT PWM controller
+
+maintainers:
+  - Marek Vasut <marek.vasut+renesas@mailbox.org>
+
+description:
+  The trivial PWM on Argon40 Fan HAT, which is a RaspberryPi blower fan
+  hat which can be controlled over I2C, generates a fixed 30 kHz period
+  PWM signal with configurable 0..100% duty cycle to control the fan
+  speed.
+
+allOf:
+  - $ref: pwm.yaml#
+
+properties:
+  compatible:
+    const: argon40,fan-hat
+
+  reg:
+    maxItems: 1
+
+  "#pwm-cells":
+    const: 3
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      pwm@1a {
+        compatible = "argon40,fan-hat";
+        reg = <0x1a>;
+        #pwm-cells = <3>;
+      };
+    };
diff --git a/Documentation/devicetree/bindings/pwm/lpc1850-sct-pwm.txt b/Documentation/devicetree/bindings/pwm/lpc1850-sct-pwm.txt
deleted file mode 100644
index 43d9f4f08a2e..000000000000
--- a/Documentation/devicetree/bindings/pwm/lpc1850-sct-pwm.txt
+++ /dev/null
@@ -1,20 +0,0 @@
-* NXP LPC18xx State Configurable Timer - Pulse Width Modulator driver
-
-Required properties:
-  - compatible: Should be "nxp,lpc1850-sct-pwm"
-  - reg: Should contain physical base address and length of pwm registers.
-  - clocks: Must contain an entry for each entry in clock-names.
-    See ../clock/clock-bindings.txt for details.
-  - clock-names: Must include the following entries.
-    - pwm: PWM operating clock.
-  - #pwm-cells: Should be 3. See pwm.yaml in this directory for the description
-    of the cells format.
-
-Example:
-  pwm: pwm@40000000 {
-    compatible = "nxp,lpc1850-sct-pwm";
-    reg = <0x40000000 0x1000>;
-    clocks =<&ccu1 CLK_CPU_SCT>;
-    clock-names = "pwm";
-    #pwm-cells = <3>;
-  };
diff --git a/Documentation/devicetree/bindings/pwm/lpc32xx-pwm.txt b/Documentation/devicetree/bindings/pwm/lpc32xx-pwm.txt
deleted file mode 100644
index 74b5bc5dd19a..000000000000
--- a/Documentation/devicetree/bindings/pwm/lpc32xx-pwm.txt
+++ /dev/null
@@ -1,17 +0,0 @@
-LPC32XX PWM controller
-
-Required properties:
-- compatible: should be "nxp,lpc3220-pwm"
-- reg: physical base address and length of the controller's registers
-
-Examples:
-
-pwm@4005c000 {
-	compatible = "nxp,lpc3220-pwm";
-	reg = <0x4005c000 0x4>;
-};
-
-pwm@4005c004 {
-	compatible = "nxp,lpc3220-pwm";
-	reg = <0x4005c004 0x4>;
-};
diff --git a/Documentation/devicetree/bindings/pwm/marvell,pxa-pwm.yaml b/Documentation/devicetree/bindings/pwm/marvell,pxa-pwm.yaml
index 9ee1946dc2e1..8df327e52810 100644
--- a/Documentation/devicetree/bindings/pwm/marvell,pxa-pwm.yaml
+++ b/Documentation/devicetree/bindings/pwm/marvell,pxa-pwm.yaml
@@ -11,26 +11,47 @@ maintainers:
 
 allOf:
   - $ref: pwm.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: spacemit,k1-pwm
+    then:
+      properties:
+        "#pwm-cells":
+          const: 3
+    else:
+      properties:
+        "#pwm-cells":
+          const: 1
+          description: |
+            Used for specifying the period length in nanoseconds.
 
 properties:
   compatible:
-    enum:
-      - marvell,pxa250-pwm
-      - marvell,pxa270-pwm
-      - marvell,pxa168-pwm
-      - marvell,pxa910-pwm
+    oneOf:
+      - enum:
+          - marvell,pxa250-pwm
+          - marvell,pxa270-pwm
+          - marvell,pxa168-pwm
+          - marvell,pxa910-pwm
+      - items:
+          - const: spacemit,k1-pwm
+          - const: marvell,pxa910-pwm
 
   reg:
     # Length should be 0x10
     maxItems: 1
 
   "#pwm-cells":
-    # Used for specifying the period length in nanoseconds
-    const: 1
+    description: Number of cells in a pwm specifier.
 
   clocks:
     maxItems: 1
 
+  resets:
+    maxItems: 1
+
 required:
   - compatible
   - reg
diff --git a/Documentation/devicetree/bindings/pwm/mediatek,mt2712-pwm.yaml b/Documentation/devicetree/bindings/pwm/mediatek,mt2712-pwm.yaml
index d515c09e1021..fc31758a40b0 100644
--- a/Documentation/devicetree/bindings/pwm/mediatek,mt2712-pwm.yaml
+++ b/Documentation/devicetree/bindings/pwm/mediatek,mt2712-pwm.yaml
@@ -18,6 +18,7 @@ properties:
       - enum:
           - mediatek,mt2712-pwm
           - mediatek,mt6795-pwm
+          - mediatek,mt6991-pwm
           - mediatek,mt7622-pwm
           - mediatek,mt7623-pwm
           - mediatek,mt7628-pwm
@@ -32,6 +33,10 @@ properties:
           - enum:
               - mediatek,mt8195-pwm
           - const: mediatek,mt8183-pwm
+      - items:
+          - enum:
+              - mediatek,mt8196-pwm
+          - const: mediatek,mt6991-pwm
 
   reg:
     maxItems: 1
diff --git a/Documentation/devicetree/bindings/pwm/nxp,lpc1850-sct-pwm.yaml b/Documentation/devicetree/bindings/pwm/nxp,lpc1850-sct-pwm.yaml
new file mode 100644
index 000000000000..ffda0123878e
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/nxp,lpc1850-sct-pwm.yaml
@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pwm/nxp,lpc1850-sct-pwm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP LPC18xx State Configurable Timer
+
+maintainers:
+  - Frank Li <Frank.Li@nxp.com>
+
+properties:
+  compatible:
+    const: nxp,lpc1850-sct-pwm
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: pwm
+
+  '#pwm-cells':
+    const: 3
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - '#pwm-cells'
+
+allOf:
+  - $ref: pwm.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/lpc18xx-ccu.h>
+
+    pwm@40000000 {
+        compatible = "nxp,lpc1850-sct-pwm";
+        reg = <0x40000000 0x1000>;
+        clocks =<&ccu1 CLK_CPU_SCT>;
+        clock-names = "pwm";
+        #pwm-cells = <3>;
+    };
diff --git a/Documentation/devicetree/bindings/pwm/nxp,lpc3220-pwm.yaml b/Documentation/devicetree/bindings/pwm/nxp,lpc3220-pwm.yaml
new file mode 100644
index 000000000000..d8ebb0735c96
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/nxp,lpc3220-pwm.yaml
@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pwm/nxp,lpc3220-pwm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP LPC32XX PWM controller
+
+maintainers:
+  - Frank Li <Frank.Li@nxp.com>
+
+properties:
+  compatible:
+    enum:
+      - nxp,lpc3220-pwm
+      - nxp,lpc3220-motor-pwm
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  '#pwm-cells':
+    const: 3
+
+required:
+  - compatible
+  - reg
+  - '#pwm-cells'
+
+allOf:
+  - $ref: pwm.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    pwm@4005c000 {
+        compatible = "nxp,lpc3220-pwm";
+        reg = <0x4005c000 0x4>;
+        #pwm-cells = <3>;
+    };
+
diff --git a/Documentation/devicetree/bindings/pwm/sophgo,sg2042-pwm.yaml b/Documentation/devicetree/bindings/pwm/sophgo,sg2042-pwm.yaml
index bbb6326d47d7..e0e91aa237ec 100644
--- a/Documentation/devicetree/bindings/pwm/sophgo,sg2042-pwm.yaml
+++ b/Documentation/devicetree/bindings/pwm/sophgo,sg2042-pwm.yaml
@@ -17,7 +17,9 @@ allOf:
 
 properties:
   compatible:
-    const: sophgo,sg2042-pwm
+    enum:
+      - sophgo,sg2042-pwm
+      - sophgo,sg2044-pwm
 
   reg:
     maxItems: 1
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index 5d2a7a8d3ac6..e5e5bd34136a 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -149,6 +149,8 @@ patternProperties:
     description: Arctic Sand
   "^arcx,.*":
     description: arcx Inc. / Archronix Inc.
+  "^argon40,.*":
+    description: Argon 40 Technologies Limited
   "^ariaboard,.*":
     description: Shanghai Novotech Co., Ltd. (Ariaboard)
   "^aries,.*":
diff --git a/Documentation/driver-api/pwm.rst b/Documentation/driver-api/pwm.rst
index b41b1c56477f..0d27a40f5818 100644
--- a/Documentation/driver-api/pwm.rst
+++ b/Documentation/driver-api/pwm.rst
@@ -173,10 +173,15 @@ Locking
 -------
 
 The PWM core list manipulations are protected by a mutex, so pwm_get()
-and pwm_put() may not be called from an atomic context. Currently the
-PWM core does not enforce any locking to pwm_enable(), pwm_disable() and
-pwm_config(), so the calling context is currently driver specific. This
-is an issue derived from the former barebone API and should be fixed soon.
+and pwm_put() may not be called from an atomic context.
+Most functions in the PWM consumer API might sleep and so must not be called
+from atomic context. The notable exception is pwm_apply_atomic() which has the
+same semantics as pwm_apply_might_sleep() but can be called from atomic context.
+(The price for that is that it doesn't work for all PWM devices, use
+pwm_might_sleep() to check if a given PWM supports atomic operation.
+
+Locking in the PWM core ensures that callbacks related to a single chip are
+serialized.
 
 Helpers
 -------
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index b45bfb4ebf30..d292a86ac5da 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -167,6 +167,7 @@ Hardware Monitoring Kernel Drivers
    max77705
    max8688
    mc13783-adc
+   mc33xs2410_hwmon
    mc34vr500
    mcp3021
    menf21bmc
diff --git a/Documentation/hwmon/mc33xs2410_hwmon.rst b/Documentation/hwmon/mc33xs2410_hwmon.rst
new file mode 100644
index 000000000000..8a2136ef9139
--- /dev/null
+++ b/Documentation/hwmon/mc33xs2410_hwmon.rst
@@ -0,0 +1,34 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Kernel driver mc33xs2410_hwmon
+==============================
+
+Supported devices:
+
+  * NXPs MC33XS2410
+
+    Datasheet: https://www.nxp.com/docs/en/data-sheet/MC33XS2410.pdf
+
+Authors:
+
+	Dimitri Fedrau <dimitri.fedrau@liebherr.com>
+
+Description
+-----------
+
+The MC33XS2410 is a four channel self-protected high-side switch featuring
+hardware monitoring functions such as temperature, current and voltages for each
+of the four channels.
+
+Sysfs entries
+-------------
+
+======================= ======================================================
+temp1_label		"Central die temperature"
+temp1_input		Measured temperature of central die
+
+temp[2-5]_label		"Channel [1-4] temperature"
+temp[2-5]_input		Measured temperature of a single channel
+temp[2-5]_alarm		Temperature alarm
+temp[2-5]_max		Maximal temperature
+======================= ======================================================
diff --git a/arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dts b/arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dts
index 900a50526d77..06731b8c7bc3 100644
--- a/arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dts
+++ b/arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dts
@@ -49,32 +49,28 @@
 		compatible = "pwm-leds";
 
 		led-d1 {
-			pwms = <&pwm0 0 7812500 PWM_POLARITY_INVERTED>;
-			active-low;
+			pwms = <&pwm0 0 7812500 0>;
 			color = <LED_COLOR_ID_GREEN>;
 			max-brightness = <255>;
 			label = "d1";
 		};
 
 		led-d2 {
-			pwms = <&pwm0 1 7812500 PWM_POLARITY_INVERTED>;
-			active-low;
+			pwms = <&pwm0 1 7812500 0>;
 			color = <LED_COLOR_ID_GREEN>;
 			max-brightness = <255>;
 			label = "d2";
 		};
 
 		led-d3 {
-			pwms = <&pwm0 2 7812500 PWM_POLARITY_INVERTED>;
-			active-low;
+			pwms = <&pwm0 2 7812500 0>;
 			color = <LED_COLOR_ID_GREEN>;
 			max-brightness = <255>;
 			label = "d3";
 		};
 
 		led-d4 {
-			pwms = <&pwm0 3 7812500 PWM_POLARITY_INVERTED>;
-			active-low;
+			pwms = <&pwm0 3 7812500 0>;
 			color = <LED_COLOR_ID_GREEN>;
 			max-brightness = <255>;
 			label = "d4";
diff --git a/arch/riscv/boot/dts/sifive/hifive-unmatched-a00.dts b/arch/riscv/boot/dts/sifive/hifive-unmatched-a00.dts
index 72b87b08ab44..03ce2cee4e97 100644
--- a/arch/riscv/boot/dts/sifive/hifive-unmatched-a00.dts
+++ b/arch/riscv/boot/dts/sifive/hifive-unmatched-a00.dts
@@ -51,8 +51,7 @@
 		compatible = "pwm-leds";
 
 		led-d12 {
-			pwms = <&pwm0 0 7812500 PWM_POLARITY_INVERTED>;
-			active-low;
+			pwms = <&pwm0 0 7812500 0>;
 			color = <LED_COLOR_ID_GREEN>;
 			max-brightness = <255>;
 			label = "d12";
@@ -68,20 +67,17 @@
 			label = "d2";
 
 			led-red {
-				pwms = <&pwm0 2 7812500 PWM_POLARITY_INVERTED>;
-				active-low;
+				pwms = <&pwm0 2 7812500 0>;
 				color = <LED_COLOR_ID_RED>;
 			};
 
 			led-green {
-				pwms = <&pwm0 1 7812500 PWM_POLARITY_INVERTED>;
-				active-low;
+				pwms = <&pwm0 1 7812500 0>;
 				color = <LED_COLOR_ID_GREEN>;
 			};
 
 			led-blue {
-				pwms = <&pwm0 3 7812500 PWM_POLARITY_INVERTED>;
-				active-low;
+				pwms = <&pwm0 3 7812500 0>;
 				color = <LED_COLOR_ID_BLUE>;
 			};
 		};
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 079620dd4286..9d28fcf7cd2a 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -700,6 +700,16 @@ config SENSORS_MC13783_ADC
         help
           Support for the A/D converter on MC13783 and MC13892 PMIC.
 
+config SENSORS_MC33XS2410
+	tristate "MC33XS2410 HWMON support"
+	depends on PWM_MC33XS2410
+	help
+	  If you say yes here you get hardware monitoring support for
+	  MC33XS2410.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called mc33xs2410_hwmon.
+
 config SENSORS_FSCHMD
 	tristate "Fujitsu Siemens Computers sensor chips"
 	depends on (X86 || COMPILE_TEST) && I2C
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 48e5866c0c9a..cd8bc4752b4d 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -165,6 +165,7 @@ obj-$(CONFIG_SENSORS_MAX31790)	+= max31790.o
 obj-$(CONFIG_MAX31827) += max31827.o
 obj-$(CONFIG_SENSORS_MAX77705) += max77705-hwmon.o
 obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o
+obj-$(CONFIG_SENSORS_MC33XS2410) += mc33xs2410_hwmon.o
 obj-$(CONFIG_SENSORS_MC34VR500)	+= mc34vr500.o
 obj-$(CONFIG_SENSORS_MCP3021)	+= mcp3021.o
 obj-$(CONFIG_SENSORS_TC654)	+= tc654.o
diff --git a/drivers/hwmon/mc33xs2410_hwmon.c b/drivers/hwmon/mc33xs2410_hwmon.c
new file mode 100644
index 000000000000..23eb90e33709
--- /dev/null
+++ b/drivers/hwmon/mc33xs2410_hwmon.c
@@ -0,0 +1,178 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2025 Liebherr-Electronics and Drives GmbH
+ */
+
+#include <linux/auxiliary_bus.h>
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/hwmon.h>
+#include <linux/mc33xs2410.h>
+#include <linux/module.h>
+
+/* ctrl registers */
+
+#define MC33XS2410_TEMP_WT			0x29
+#define MC33XS2410_TEMP_WT_MASK			GENMASK(7, 0)
+
+/* diag registers */
+
+/* chan in { 1 ... 4 } */
+#define MC33XS2410_OUT_STA(chan)		(0x02 + (chan) - 1)
+#define MC33XS2410_OUT_STA_OTW			BIT(8)
+
+#define MC33XS2410_TS_TEMP_DIE			0x26
+#define MC33XS2410_TS_TEMP_MASK			GENMASK(9, 0)
+
+/* chan in { 1 ... 4 } */
+#define MC33XS2410_TS_TEMP(chan)		(0x2f + (chan) - 1)
+
+static const struct hwmon_channel_info * const mc33xs2410_hwmon_info[] = {
+	HWMON_CHANNEL_INFO(temp,
+			   HWMON_T_LABEL | HWMON_T_INPUT,
+			   HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX |
+			   HWMON_T_ALARM,
+			   HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX |
+			   HWMON_T_ALARM,
+			   HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX |
+			   HWMON_T_ALARM,
+			   HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX |
+			   HWMON_T_ALARM),
+	NULL,
+};
+
+static umode_t mc33xs2410_hwmon_is_visible(const void *data,
+					   enum hwmon_sensor_types type,
+					   u32 attr, int channel)
+{
+	switch (attr) {
+	case hwmon_temp_input:
+	case hwmon_temp_alarm:
+	case hwmon_temp_label:
+		return 0444;
+	case hwmon_temp_max:
+		return 0644;
+	default:
+		return 0;
+	}
+}
+
+static int mc33xs2410_hwmon_read(struct device *dev,
+				 enum hwmon_sensor_types type,
+				 u32 attr, int channel, long *val)
+{
+	struct spi_device *spi = dev_get_drvdata(dev);
+	u16 reg_val;
+	int ret;
+	u8 reg;
+
+	switch (attr) {
+	case hwmon_temp_input:
+		reg = (channel == 0) ? MC33XS2410_TS_TEMP_DIE :
+				       MC33XS2410_TS_TEMP(channel);
+		ret = mc33xs2410_read_reg_diag(spi, reg, &reg_val);
+		if (ret < 0)
+			return ret;
+
+		/* LSB is 0.25 degree celsius */
+		*val = FIELD_GET(MC33XS2410_TS_TEMP_MASK, reg_val) * 250 - 40000;
+		return 0;
+	case hwmon_temp_alarm:
+		ret = mc33xs2410_read_reg_diag(spi, MC33XS2410_OUT_STA(channel),
+					       &reg_val);
+		if (ret < 0)
+			return ret;
+
+		*val = FIELD_GET(MC33XS2410_OUT_STA_OTW, reg_val);
+		return 0;
+	case hwmon_temp_max:
+		ret = mc33xs2410_read_reg_ctrl(spi, MC33XS2410_TEMP_WT, &reg_val);
+		if (ret < 0)
+			return ret;
+
+		/* LSB is 1 degree celsius */
+		*val = FIELD_GET(MC33XS2410_TEMP_WT_MASK, reg_val) * 1000 - 40000;
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int mc33xs2410_hwmon_write(struct device *dev,
+				  enum hwmon_sensor_types type, u32 attr,
+				  int channel, long val)
+{
+	struct spi_device *spi = dev_get_drvdata(dev);
+
+	switch (attr) {
+	case hwmon_temp_max:
+		val = clamp_val(val, -40000, 215000);
+
+		/* LSB is 1 degree celsius */
+		val = (val / 1000) + 40;
+		return mc33xs2410_modify_reg(spi, MC33XS2410_TEMP_WT,
+					     MC33XS2410_TEMP_WT_MASK, val);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static const char *const mc33xs2410_temp_label[] = {
+	"Central die temperature",
+	"Channel 1 temperature",
+	"Channel 2 temperature",
+	"Channel 3 temperature",
+	"Channel 4 temperature",
+};
+
+static int mc33xs2410_read_string(struct device *dev,
+				  enum hwmon_sensor_types type,
+				  u32 attr, int channel, const char **str)
+{
+	*str = mc33xs2410_temp_label[channel];
+
+	return 0;
+}
+
+static const struct hwmon_ops mc33xs2410_hwmon_hwmon_ops = {
+	.is_visible = mc33xs2410_hwmon_is_visible,
+	.read = mc33xs2410_hwmon_read,
+	.read_string = mc33xs2410_read_string,
+	.write = mc33xs2410_hwmon_write,
+};
+
+static const struct hwmon_chip_info mc33xs2410_hwmon_chip_info = {
+	.ops = &mc33xs2410_hwmon_hwmon_ops,
+	.info = mc33xs2410_hwmon_info,
+};
+
+static int mc33xs2410_hwmon_probe(struct auxiliary_device *adev,
+				  const struct auxiliary_device_id *id)
+{
+	struct device *dev = &adev->dev;
+	struct spi_device *spi = container_of(dev->parent, struct spi_device, dev);
+	struct device *hwmon;
+
+	hwmon = devm_hwmon_device_register_with_info(dev, NULL, spi,
+						     &mc33xs2410_hwmon_chip_info,
+						     NULL);
+	return PTR_ERR_OR_ZERO(hwmon);
+}
+
+static const struct auxiliary_device_id mc33xs2410_hwmon_ids[] = {
+	{
+		.name = "pwm_mc33xs2410.hwmon",
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(auxiliary, mc33xs2410_hwmon_ids);
+
+static struct auxiliary_driver mc33xs2410_hwmon_driver = {
+	.probe = mc33xs2410_hwmon_probe,
+	.id_table = mc33xs2410_hwmon_ids,
+};
+module_auxiliary_driver(mc33xs2410_hwmon_driver);
+
+MODULE_DESCRIPTION("NXP MC33XS2410 hwmon driver");
+MODULE_AUTHOR("Dimitri Fedrau <dimitri.fedrau@liebherr.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index d9bcd1e8413e..f00ce973dddf 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -66,6 +66,15 @@ config PWM_APPLE
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-apple.
 
+config PWM_ARGON_FAN_HAT
+	tristate "Argon40 Fan HAT support"
+	depends on I2C && OF
+	help
+	  Generic PWM framework driver for Argon40 Fan HAT.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called pwm-argon-fan-hat.
+
 config PWM_ATMEL
 	tristate "Atmel PWM support"
 	depends on ARCH_AT91 || COMPILE_TEST
@@ -427,6 +436,7 @@ config PWM_MC33XS2410
 	tristate "MC33XS2410 PWM support"
 	depends on OF
 	depends on SPI
+	select AUXILIARY_BUS
 	help
 	  NXP MC33XS2410 high-side switch driver. The MC33XS2410 is a four
 	  channel high-side switch. The device is operational from 3.0 V
@@ -517,7 +527,7 @@ config PWM_PCA9685
 
 config PWM_PXA
 	tristate "PXA PWM support"
-	depends on ARCH_PXA || ARCH_MMP || COMPILE_TEST
+	depends on ARCH_PXA || ARCH_MMP || ARCH_SPACEMIT || COMPILE_TEST
 	depends on HAS_IOMEM
 	help
 	  Generic PWM framework driver for PXA.
@@ -526,7 +536,7 @@ config PWM_PXA
 	  will be called pwm-pxa.
 
 config PWM_RASPBERRYPI_POE
-	tristate "Raspberry Pi Firwmware PoE Hat PWM support"
+	tristate "Raspberry Pi Firmware PoE Hat PWM support"
 	# Make sure not 'y' when RASPBERRYPI_FIRMWARE is 'm'. This can only
 	# happen when COMPILE_TEST=y, hence the added !RASPBERRYPI_FIRMWARE.
 	depends on RASPBERRYPI_FIRMWARE || (COMPILE_TEST && !RASPBERRYPI_FIRMWARE)
diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
index 96160f4257fc..ff4f47e5fb7a 100644
--- a/drivers/pwm/Makefile
+++ b/drivers/pwm/Makefile
@@ -3,6 +3,7 @@ obj-$(CONFIG_PWM)		+= core.o
 obj-$(CONFIG_PWM_AB8500)	+= pwm-ab8500.o
 obj-$(CONFIG_PWM_ADP5585)	+= pwm-adp5585.o
 obj-$(CONFIG_PWM_APPLE)		+= pwm-apple.o
+obj-$(CONFIG_PWM_ARGON_FAN_HAT)	+= pwm-argon-fan-hat.o
 obj-$(CONFIG_PWM_ATMEL)		+= pwm-atmel.o
 obj-$(CONFIG_PWM_ATMEL_HLCDC_PWM)	+= pwm-atmel-hlcdc.o
 obj-$(CONFIG_PWM_ATMEL_TCB)	+= pwm-atmel-tcb.o
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index edf776b8ad53..0d66376a83ec 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -23,9 +23,13 @@
 
 #include <dt-bindings/pwm/pwm.h>
 
+#include <uapi/linux/pwm.h>
+
 #define CREATE_TRACE_POINTS
 #include <trace/events/pwm.h>
 
+#define PWM_MINOR_COUNT 256
+
 /* protects access to pwm_chips */
 static DEFINE_MUTEX(pwm_lock);
 
@@ -206,8 +210,6 @@ static int __pwm_write_waveform(struct pwm_chip *chip, struct pwm_device *pwm, c
 	return ret;
 }
 
-#define WFHWSIZE 20
-
 /**
  * pwm_round_waveform_might_sleep - Query hardware capabilities
  * Cannot be used in atomic context.
@@ -244,10 +246,10 @@ int pwm_round_waveform_might_sleep(struct pwm_device *pwm, struct pwm_waveform *
 	struct pwm_chip *chip = pwm->chip;
 	const struct pwm_ops *ops = chip->ops;
 	struct pwm_waveform wf_req = *wf;
-	char wfhw[WFHWSIZE];
+	char wfhw[PWM_WFHWSIZE];
 	int ret_tohw, ret_fromhw;
 
-	BUG_ON(WFHWSIZE < ops->sizeof_wfhw);
+	BUG_ON(PWM_WFHWSIZE < ops->sizeof_wfhw);
 
 	if (!pwmchip_supports_waveform(chip))
 		return -EOPNOTSUPP;
@@ -302,10 +304,10 @@ int pwm_get_waveform_might_sleep(struct pwm_device *pwm, struct pwm_waveform *wf
 {
 	struct pwm_chip *chip = pwm->chip;
 	const struct pwm_ops *ops = chip->ops;
-	char wfhw[WFHWSIZE];
+	char wfhw[PWM_WFHWSIZE];
 	int err;
 
-	BUG_ON(WFHWSIZE < ops->sizeof_wfhw);
+	BUG_ON(PWM_WFHWSIZE < ops->sizeof_wfhw);
 
 	if (!pwmchip_supports_waveform(chip) || !ops->read_waveform)
 		return -EOPNOTSUPP;
@@ -330,11 +332,11 @@ static int __pwm_set_waveform(struct pwm_device *pwm,
 {
 	struct pwm_chip *chip = pwm->chip;
 	const struct pwm_ops *ops = chip->ops;
-	char wfhw[WFHWSIZE];
+	char wfhw[PWM_WFHWSIZE];
 	struct pwm_waveform wf_rounded;
 	int err, ret_tohw;
 
-	BUG_ON(WFHWSIZE < ops->sizeof_wfhw);
+	BUG_ON(PWM_WFHWSIZE < ops->sizeof_wfhw);
 
 	if (!pwmchip_supports_waveform(chip))
 		return -EOPNOTSUPP;
@@ -646,9 +648,9 @@ static int __pwm_apply(struct pwm_device *pwm, const struct pwm_state *state)
 
 	if (pwmchip_supports_waveform(chip)) {
 		struct pwm_waveform wf;
-		char wfhw[WFHWSIZE];
+		char wfhw[PWM_WFHWSIZE];
 
-		BUG_ON(WFHWSIZE < ops->sizeof_wfhw);
+		BUG_ON(PWM_WFHWSIZE < ops->sizeof_wfhw);
 
 		pwm_state2wf(state, &wf);
 
@@ -805,10 +807,10 @@ int pwm_get_state_hw(struct pwm_device *pwm, struct pwm_state *state)
 		return -ENODEV;
 
 	if (pwmchip_supports_waveform(chip) && ops->read_waveform) {
-		char wfhw[WFHWSIZE];
+		char wfhw[PWM_WFHWSIZE];
 		struct pwm_waveform wf;
 
-		BUG_ON(WFHWSIZE < ops->sizeof_wfhw);
+		BUG_ON(PWM_WFHWSIZE < ops->sizeof_wfhw);
 
 		ret = __pwm_read_waveform(chip, pwm, &wfhw);
 		if (ret)
@@ -1692,8 +1694,8 @@ static bool pwm_ops_check(const struct pwm_chip *chip)
 		    !ops->write_waveform)
 			return false;
 
-		if (WFHWSIZE < ops->sizeof_wfhw) {
-			dev_warn(pwmchip_parent(chip), "WFHWSIZE < %zu\n", ops->sizeof_wfhw);
+		if (PWM_WFHWSIZE < ops->sizeof_wfhw) {
+			dev_warn(pwmchip_parent(chip), "PWM_WFHWSIZE < %zu\n", ops->sizeof_wfhw);
 			return false;
 		}
 	} else {
@@ -2007,20 +2009,9 @@ struct pwm_device *pwm_get(struct device *dev, const char *con_id)
 }
 EXPORT_SYMBOL_GPL(pwm_get);
 
-/**
- * pwm_put() - release a PWM device
- * @pwm: PWM device
- */
-void pwm_put(struct pwm_device *pwm)
+static void __pwm_put(struct pwm_device *pwm)
 {
-	struct pwm_chip *chip;
-
-	if (!pwm)
-		return;
-
-	chip = pwm->chip;
-
-	guard(mutex)(&pwm_lock);
+	struct pwm_chip *chip = pwm->chip;
 
 	/*
 	 * Trigger a warning if a consumer called pwm_put() twice.
@@ -2041,6 +2032,20 @@ void pwm_put(struct pwm_device *pwm)
 
 	module_put(chip->owner);
 }
+
+/**
+ * pwm_put() - release a PWM device
+ * @pwm: PWM device
+ */
+void pwm_put(struct pwm_device *pwm)
+{
+	if (!pwm)
+		return;
+
+	guard(mutex)(&pwm_lock);
+
+	__pwm_put(pwm);
+}
 EXPORT_SYMBOL_GPL(pwm_put);
 
 static void devm_pwm_release(void *pwm)
@@ -2110,6 +2115,274 @@ struct pwm_device *devm_fwnode_pwm_get(struct device *dev,
 }
 EXPORT_SYMBOL_GPL(devm_fwnode_pwm_get);
 
+struct pwm_cdev_data {
+	struct pwm_chip *chip;
+	struct pwm_device *pwm[];
+};
+
+static int pwm_cdev_open(struct inode *inode, struct file *file)
+{
+	struct pwm_chip *chip = container_of(inode->i_cdev, struct pwm_chip, cdev);
+	struct pwm_cdev_data *cdata;
+
+	guard(mutex)(&pwm_lock);
+
+	if (!chip->operational)
+		return -ENXIO;
+
+	cdata = kzalloc(struct_size(cdata, pwm, chip->npwm), GFP_KERNEL);
+	if (!cdata)
+		return -ENOMEM;
+
+	cdata->chip = chip;
+
+	file->private_data = cdata;
+
+	return nonseekable_open(inode, file);
+}
+
+static int pwm_cdev_release(struct inode *inode, struct file *file)
+{
+	struct pwm_cdev_data *cdata = file->private_data;
+	unsigned int i;
+
+	for (i = 0; i < cdata->chip->npwm; ++i) {
+		struct pwm_device *pwm = cdata->pwm[i];
+
+		if (pwm) {
+			const char *label = pwm->label;
+
+			pwm_put(cdata->pwm[i]);
+			kfree(label);
+		}
+	}
+	kfree(cdata);
+
+	return 0;
+}
+
+static int pwm_cdev_request(struct pwm_cdev_data *cdata, unsigned int hwpwm)
+{
+	struct pwm_chip *chip = cdata->chip;
+
+	if (hwpwm >= chip->npwm)
+		return -EINVAL;
+
+	if (!cdata->pwm[hwpwm]) {
+		struct pwm_device *pwm = &chip->pwms[hwpwm];
+		const char *label;
+		int ret;
+
+		label = kasprintf(GFP_KERNEL, "pwm-cdev (pid=%d)", current->pid);
+		if (!label)
+			return -ENOMEM;
+
+		ret = pwm_device_request(pwm, label);
+		if (ret < 0) {
+			kfree(label);
+			return ret;
+		}
+
+		cdata->pwm[hwpwm] = pwm;
+	}
+
+	return 0;
+}
+
+static int pwm_cdev_free(struct pwm_cdev_data *cdata, unsigned int hwpwm)
+{
+	struct pwm_chip *chip = cdata->chip;
+
+	if (hwpwm >= chip->npwm)
+		return -EINVAL;
+
+	if (cdata->pwm[hwpwm]) {
+		struct pwm_device *pwm = cdata->pwm[hwpwm];
+		const char *label = pwm->label;
+
+		__pwm_put(pwm);
+
+		kfree(label);
+
+		cdata->pwm[hwpwm] = NULL;
+	}
+
+	return 0;
+}
+
+static struct pwm_device *pwm_cdev_get_requested_pwm(struct pwm_cdev_data *cdata,
+						     u32 hwpwm)
+{
+	struct pwm_chip *chip = cdata->chip;
+
+	if (hwpwm >= chip->npwm)
+		return ERR_PTR(-EINVAL);
+
+	if (cdata->pwm[hwpwm])
+		return cdata->pwm[hwpwm];
+
+	return ERR_PTR(-EINVAL);
+}
+
+static long pwm_cdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	int ret = 0;
+	struct pwm_cdev_data *cdata = file->private_data;
+	struct pwm_chip *chip = cdata->chip;
+
+	guard(mutex)(&pwm_lock);
+
+	if (!chip->operational)
+		return -ENODEV;
+
+	switch (cmd) {
+	case PWM_IOCTL_REQUEST:
+		{
+			unsigned int hwpwm = arg;
+
+			return pwm_cdev_request(cdata, hwpwm);
+		}
+
+	case PWM_IOCTL_FREE:
+		{
+			unsigned int hwpwm = arg;
+
+			return pwm_cdev_free(cdata, hwpwm);
+		}
+
+	case PWM_IOCTL_ROUNDWF:
+		{
+			struct pwmchip_waveform cwf;
+			struct pwm_waveform wf;
+			struct pwm_device *pwm;
+
+			ret = copy_from_user(&cwf,
+					     (struct pwmchip_waveform __user *)arg,
+					     sizeof(cwf));
+			if (ret)
+				return -EFAULT;
+
+			if (cwf.__pad != 0)
+				return -EINVAL;
+
+			pwm = pwm_cdev_get_requested_pwm(cdata, cwf.hwpwm);
+			if (IS_ERR(pwm))
+				return PTR_ERR(pwm);
+
+			wf = (struct pwm_waveform) {
+				.period_length_ns = cwf.period_length_ns,
+				.duty_length_ns = cwf.duty_length_ns,
+				.duty_offset_ns = cwf.duty_offset_ns,
+			};
+
+			ret = pwm_round_waveform_might_sleep(pwm, &wf);
+			if (ret < 0)
+				return ret;
+
+			cwf = (struct pwmchip_waveform) {
+				.hwpwm = cwf.hwpwm,
+				.period_length_ns = wf.period_length_ns,
+				.duty_length_ns = wf.duty_length_ns,
+				.duty_offset_ns = wf.duty_offset_ns,
+			};
+
+			return copy_to_user((struct pwmchip_waveform __user *)arg,
+					    &cwf, sizeof(cwf));
+		}
+
+	case PWM_IOCTL_GETWF:
+		{
+			struct pwmchip_waveform cwf;
+			struct pwm_waveform wf;
+			struct pwm_device *pwm;
+
+			ret = copy_from_user(&cwf,
+					     (struct pwmchip_waveform __user *)arg,
+					     sizeof(cwf));
+			if (ret)
+				return -EFAULT;
+
+			if (cwf.__pad != 0)
+				return -EINVAL;
+
+			pwm = pwm_cdev_get_requested_pwm(cdata, cwf.hwpwm);
+			if (IS_ERR(pwm))
+				return PTR_ERR(pwm);
+
+			ret = pwm_get_waveform_might_sleep(pwm, &wf);
+			if (ret)
+				return ret;
+
+			cwf = (struct pwmchip_waveform) {
+				.hwpwm = cwf.hwpwm,
+				.period_length_ns = wf.period_length_ns,
+				.duty_length_ns = wf.duty_length_ns,
+				.duty_offset_ns = wf.duty_offset_ns,
+			};
+
+			return copy_to_user((struct pwmchip_waveform __user *)arg,
+					    &cwf, sizeof(cwf));
+		}
+
+	case PWM_IOCTL_SETROUNDEDWF:
+	case PWM_IOCTL_SETEXACTWF:
+		{
+			struct pwmchip_waveform cwf;
+			struct pwm_waveform wf;
+			struct pwm_device *pwm;
+
+			ret = copy_from_user(&cwf,
+					     (struct pwmchip_waveform __user *)arg,
+					     sizeof(cwf));
+			if (ret)
+				return -EFAULT;
+
+			if (cwf.__pad != 0)
+				return -EINVAL;
+
+			wf = (struct pwm_waveform){
+				.period_length_ns = cwf.period_length_ns,
+				.duty_length_ns = cwf.duty_length_ns,
+				.duty_offset_ns = cwf.duty_offset_ns,
+			};
+
+			if (!pwm_wf_valid(&wf))
+				return -EINVAL;
+
+			pwm = pwm_cdev_get_requested_pwm(cdata, cwf.hwpwm);
+			if (IS_ERR(pwm))
+				return PTR_ERR(pwm);
+
+			ret = pwm_set_waveform_might_sleep(pwm, &wf,
+							   cmd == PWM_IOCTL_SETEXACTWF);
+
+			/*
+			 * If userspace cares about rounding deviations it has
+			 * to check the values anyhow, so simplify handling for
+			 * them and don't signal uprounding. This matches the
+			 * behaviour of PWM_IOCTL_ROUNDWF which also returns 0
+			 * in that case.
+			 */
+			if (ret == 1)
+				ret = 0;
+
+			return ret;
+		}
+
+	default:
+		return -ENOTTY;
+	}
+}
+
+static const struct file_operations pwm_cdev_fileops = {
+	.open = pwm_cdev_open,
+	.release = pwm_cdev_release,
+	.owner = THIS_MODULE,
+	.unlocked_ioctl = pwm_cdev_ioctl,
+};
+
+static dev_t pwm_devt;
+
 /**
  * __pwmchip_add() - register a new PWM chip
  * @chip: the PWM chip to add
@@ -2162,7 +2435,17 @@ int __pwmchip_add(struct pwm_chip *chip, struct module *owner)
 	scoped_guard(pwmchip, chip)
 		chip->operational = true;
 
-	ret = device_add(&chip->dev);
+	if (chip->ops->write_waveform) {
+		if (chip->id < PWM_MINOR_COUNT)
+			chip->dev.devt = MKDEV(MAJOR(pwm_devt), chip->id);
+		else
+			dev_warn(&chip->dev, "chip id too high to create a chardev\n");
+	}
+
+	cdev_init(&chip->cdev, &pwm_cdev_fileops);
+	chip->cdev.owner = owner;
+
+	ret = cdev_device_add(&chip->cdev, &chip->dev);
 	if (ret)
 		goto err_device_add;
 
@@ -2213,7 +2496,7 @@ void pwmchip_remove(struct pwm_chip *chip)
 		idr_remove(&pwm_chips, chip->id);
 	}
 
-	device_del(&chip->dev);
+	cdev_device_del(&chip->cdev, &chip->dev);
 }
 EXPORT_SYMBOL_GPL(pwmchip_remove);
 
@@ -2357,9 +2640,16 @@ static int __init pwm_init(void)
 {
 	int ret;
 
+	ret = alloc_chrdev_region(&pwm_devt, 0, PWM_MINOR_COUNT, "pwm");
+	if (ret) {
+		pr_err("Failed to initialize chrdev region for PWM usage\n");
+		return ret;
+	}
+
 	ret = class_register(&pwm_class);
 	if (ret) {
 		pr_err("Failed to initialize PWM class (%pe)\n", ERR_PTR(ret));
+		unregister_chrdev_region(pwm_devt, 256);
 		return ret;
 	}
 
diff --git a/drivers/pwm/pwm-argon-fan-hat.c b/drivers/pwm/pwm-argon-fan-hat.c
new file mode 100644
index 000000000000..2c59bd142d40
--- /dev/null
+++ b/drivers/pwm/pwm-argon-fan-hat.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2025 Marek Vasut
+ *
+ * Limitations:
+ * - no support for offset/polarity
+ * - fixed 30 kHz period
+ *
+ * Argon Fan HAT https://argon40.com/products/argon-fan-hat
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/pwm.h>
+
+#define ARGON40_FAN_HAT_PERIOD_NS	33333	/* ~30 kHz */
+
+#define ARGON40_FAN_HAT_REG_DUTY_CYCLE	0x80
+
+static int argon_fan_hat_round_waveform_tohw(struct pwm_chip *chip,
+					     struct pwm_device *pwm,
+					     const struct pwm_waveform *wf,
+					     void *_wfhw)
+{
+	u8 *wfhw = _wfhw;
+
+	if (wf->duty_length_ns > ARGON40_FAN_HAT_PERIOD_NS)
+		*wfhw = 100;
+	else
+		*wfhw = mul_u64_u64_div_u64(wf->duty_length_ns, 100, ARGON40_FAN_HAT_PERIOD_NS);
+
+	return 0;
+}
+
+static int argon_fan_hat_round_waveform_fromhw(struct pwm_chip *chip,
+					       struct pwm_device *pwm,
+					       const void *_wfhw,
+					       struct pwm_waveform *wf)
+{
+	const u8 *wfhw = _wfhw;
+
+	wf->period_length_ns = ARGON40_FAN_HAT_PERIOD_NS;
+	wf->duty_length_ns = DIV64_U64_ROUND_UP(wf->period_length_ns * *wfhw, 100);
+	wf->duty_offset_ns = 0;
+
+	return 0;
+}
+
+static int argon_fan_hat_write_waveform(struct pwm_chip *chip,
+					struct pwm_device *pwm,
+					const void *_wfhw)
+{
+	struct i2c_client *i2c = pwmchip_get_drvdata(chip);
+	const u8 *wfhw = _wfhw;
+
+	return i2c_smbus_write_byte_data(i2c, ARGON40_FAN_HAT_REG_DUTY_CYCLE, *wfhw);
+}
+
+static const struct pwm_ops argon_fan_hat_pwm_ops = {
+	.sizeof_wfhw = sizeof(u8),
+	.round_waveform_fromhw = argon_fan_hat_round_waveform_fromhw,
+	.round_waveform_tohw = argon_fan_hat_round_waveform_tohw,
+	.write_waveform = argon_fan_hat_write_waveform,
+	/*
+	 * The controller does not provide any way to read info back,
+	 * reading from the controller stops the fan, therefore there
+	 * is no .read_waveform here.
+	 */
+};
+
+static int argon_fan_hat_i2c_probe(struct i2c_client *i2c)
+{
+	struct pwm_chip *chip = devm_pwmchip_alloc(&i2c->dev, 1, 0);
+	int ret;
+
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+
+	chip->ops = &argon_fan_hat_pwm_ops;
+	pwmchip_set_drvdata(chip, i2c);
+
+	ret = devm_pwmchip_add(&i2c->dev, chip);
+	if (ret)
+		return dev_err_probe(&i2c->dev, ret, "Could not add PWM chip\n");
+
+	return 0;
+}
+
+static const struct of_device_id argon_fan_hat_dt_ids[] = {
+	{ .compatible = "argon40,fan-hat" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, argon_fan_hat_dt_ids);
+
+static struct i2c_driver argon_fan_hat_driver = {
+	.driver = {
+		.name = "argon-fan-hat",
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+		.of_match_table = argon_fan_hat_dt_ids,
+	},
+	.probe = argon_fan_hat_i2c_probe,
+};
+
+module_i2c_driver(argon_fan_hat_driver);
+
+MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@mailbox.org>");
+MODULE_DESCRIPTION("Argon40 Fan HAT");
+MODULE_LICENSE("GPL");
diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
index b2f0abbbad63..06d22d0f7b26 100644
--- a/drivers/pwm/pwm-atmel.c
+++ b/drivers/pwm/pwm-atmel.c
@@ -91,9 +91,6 @@ struct atmel_pwm_chip {
 	 * hardware.
 	 */
 	u32 update_pending;
-
-	/* Protects .update_pending */
-	spinlock_t lock;
 };
 
 static inline struct atmel_pwm_chip *to_atmel_pwm_chip(struct pwm_chip *chip)
@@ -145,8 +142,6 @@ static void atmel_pwm_update_pending(struct atmel_pwm_chip *chip)
 
 static void atmel_pwm_set_pending(struct atmel_pwm_chip *chip, unsigned int ch)
 {
-	spin_lock(&chip->lock);
-
 	/*
 	 * Clear pending flags in hardware because otherwise there might still
 	 * be a stale flag in ISR.
@@ -154,16 +149,12 @@ static void atmel_pwm_set_pending(struct atmel_pwm_chip *chip, unsigned int ch)
 	atmel_pwm_update_pending(chip);
 
 	chip->update_pending |= (1 << ch);
-
-	spin_unlock(&chip->lock);
 }
 
 static int atmel_pwm_test_pending(struct atmel_pwm_chip *chip, unsigned int ch)
 {
 	int ret = 0;
 
-	spin_lock(&chip->lock);
-
 	if (chip->update_pending & (1 << ch)) {
 		atmel_pwm_update_pending(chip);
 
@@ -171,8 +162,6 @@ static int atmel_pwm_test_pending(struct atmel_pwm_chip *chip, unsigned int ch)
 			ret = 1;
 	}
 
-	spin_unlock(&chip->lock);
-
 	return ret;
 }
 
@@ -509,7 +498,6 @@ static int atmel_pwm_probe(struct platform_device *pdev)
 	atmel_pwm->data = of_device_get_match_data(&pdev->dev);
 
 	atmel_pwm->update_pending = 0;
-	spin_lock_init(&atmel_pwm->lock);
 
 	atmel_pwm->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(atmel_pwm->base))
diff --git a/drivers/pwm/pwm-clps711x.c b/drivers/pwm/pwm-clps711x.c
index 04559a9de718..2c92ce754872 100644
--- a/drivers/pwm/pwm-clps711x.c
+++ b/drivers/pwm/pwm-clps711x.c
@@ -14,7 +14,6 @@
 struct clps711x_chip {
 	void __iomem *pmpcon;
 	struct clk *clk;
-	spinlock_t lock;
 };
 
 static inline struct clps711x_chip *to_clps711x_chip(struct pwm_chip *chip)
@@ -42,7 +41,6 @@ static int clps711x_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	struct clps711x_chip *priv = to_clps711x_chip(chip);
 	/* PWM0 - bits 4..7, PWM1 - bits 8..11 */
 	u32 shift = (pwm->hwpwm + 1) * 4;
-	unsigned long flags;
 	u32 pmpcon, val;
 
 	if (state->polarity != PWM_POLARITY_NORMAL)
@@ -56,15 +54,11 @@ static int clps711x_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	else
 		val = 0;
 
-	spin_lock_irqsave(&priv->lock, flags);
-
 	pmpcon = readl(priv->pmpcon);
 	pmpcon &= ~(0xf << shift);
 	pmpcon |= val << shift;
 	writel(pmpcon, priv->pmpcon);
 
-	spin_unlock_irqrestore(&priv->lock, flags);
-
 	return 0;
 }
 
@@ -93,8 +87,6 @@ static int clps711x_pwm_probe(struct platform_device *pdev)
 
 	chip->ops = &clps711x_pwm_ops;
 
-	spin_lock_init(&priv->lock);
-
 	return devm_pwmchip_add(&pdev->dev, chip);
 }
 
diff --git a/drivers/pwm/pwm-fsl-ftm.c b/drivers/pwm/pwm-fsl-ftm.c
index c45a5fca4cbb..6683931872fc 100644
--- a/drivers/pwm/pwm-fsl-ftm.c
+++ b/drivers/pwm/pwm-fsl-ftm.c
@@ -10,7 +10,6 @@
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/mutex.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pm.h>
@@ -40,7 +39,6 @@ struct fsl_pwm_periodcfg {
 };
 
 struct fsl_pwm_chip {
-	struct mutex lock;
 	struct regmap *regmap;
 
 	/* This value is valid iff a pwm is running */
@@ -89,11 +87,8 @@ static int fsl_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
 	struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
 
 	ret = clk_prepare_enable(fpc->ipg_clk);
-	if (!ret && fpc->soc->has_enable_bits) {
-		mutex_lock(&fpc->lock);
+	if (!ret && fpc->soc->has_enable_bits)
 		regmap_set_bits(fpc->regmap, FTM_SC, BIT(pwm->hwpwm + 16));
-		mutex_unlock(&fpc->lock);
-	}
 
 	return ret;
 }
@@ -102,11 +97,8 @@ static void fsl_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
 {
 	struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
 
-	if (fpc->soc->has_enable_bits) {
-		mutex_lock(&fpc->lock);
+	if (fpc->soc->has_enable_bits)
 		regmap_clear_bits(fpc->regmap, FTM_SC, BIT(pwm->hwpwm + 16));
-		mutex_unlock(&fpc->lock);
-	}
 
 	clk_disable_unprepare(fpc->ipg_clk);
 }
@@ -304,7 +296,7 @@ static int fsl_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 {
 	struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
 	struct pwm_state *oldstate = &pwm->state;
-	int ret = 0;
+	int ret;
 
 	/*
 	 * oldstate to newstate : action
@@ -315,8 +307,6 @@ static int fsl_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	 * disabled to enabled : update settings + enable
 	 */
 
-	mutex_lock(&fpc->lock);
-
 	if (!newstate->enabled) {
 		if (oldstate->enabled) {
 			regmap_set_bits(fpc->regmap, FTM_OUTMASK,
@@ -325,30 +315,28 @@ static int fsl_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 			clk_disable_unprepare(fpc->clk[fpc->period.clk_select]);
 		}
 
-		goto end_mutex;
+		return 0;
 	}
 
 	ret = fsl_pwm_apply_config(chip, pwm, newstate);
 	if (ret)
-		goto end_mutex;
+		return ret;
 
 	/* check if need to enable */
 	if (!oldstate->enabled) {
 		ret = clk_prepare_enable(fpc->clk[fpc->period.clk_select]);
 		if (ret)
-			goto end_mutex;
+			return ret;
 
 		ret = clk_prepare_enable(fpc->clk[FSL_PWM_CLK_CNTEN]);
 		if (ret) {
 			clk_disable_unprepare(fpc->clk[fpc->period.clk_select]);
-			goto end_mutex;
+			return ret;
 		}
 
 		regmap_clear_bits(fpc->regmap, FTM_OUTMASK, BIT(pwm->hwpwm));
 	}
 
-end_mutex:
-	mutex_unlock(&fpc->lock);
 	return ret;
 }
 
@@ -408,8 +396,6 @@ static int fsl_pwm_probe(struct platform_device *pdev)
 		return PTR_ERR(chip);
 	fpc = to_fsl_chip(chip);
 
-	mutex_init(&fpc->lock);
-
 	fpc->soc = of_device_get_match_data(&pdev->dev);
 
 	base = devm_platform_ioremap_resource(pdev, 0);
diff --git a/drivers/pwm/pwm-img.c b/drivers/pwm/pwm-img.c
index 71542956feca..91e0b19f0c08 100644
--- a/drivers/pwm/pwm-img.c
+++ b/drivers/pwm/pwm-img.c
@@ -139,7 +139,6 @@ static int img_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	      (timebase << PWM_CH_CFG_TMBASE_SHIFT);
 	img_pwm_writel(imgchip, PWM_CH_CFG(pwm->hwpwm), val);
 
-	pm_runtime_mark_last_busy(pwmchip_parent(chip));
 	pm_runtime_put_autosuspend(pwmchip_parent(chip));
 
 	return 0;
@@ -175,7 +174,6 @@ static void img_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 	val &= ~BIT(pwm->hwpwm);
 	img_pwm_writel(imgchip, PWM_CTRL_CFG, val);
 
-	pm_runtime_mark_last_busy(pwmchip_parent(chip));
 	pm_runtime_put_autosuspend(pwmchip_parent(chip));
 }
 
diff --git a/drivers/pwm/pwm-lpc18xx-sct.c b/drivers/pwm/pwm-lpc18xx-sct.c
index f351baa63453..1e614b2a0227 100644
--- a/drivers/pwm/pwm-lpc18xx-sct.c
+++ b/drivers/pwm/pwm-lpc18xx-sct.c
@@ -100,8 +100,6 @@ struct lpc18xx_pwm_chip {
 	u64 max_period_ns;
 	unsigned int period_event;
 	unsigned long event_map;
-	struct mutex res_lock;
-	struct mutex period_lock;
 	struct lpc18xx_pwm_data channeldata[LPC18XX_NUM_PWMS];
 };
 
@@ -129,8 +127,6 @@ static void lpc18xx_pwm_set_conflict_res(struct lpc18xx_pwm_chip *lpc18xx_pwm,
 {
 	u32 val;
 
-	mutex_lock(&lpc18xx_pwm->res_lock);
-
 	/*
 	 * Simultaneous set and clear may happen on an output, that is the case
 	 * when duty_ns == period_ns. LPC18xx SCT allows to set a conflict
@@ -140,8 +136,6 @@ static void lpc18xx_pwm_set_conflict_res(struct lpc18xx_pwm_chip *lpc18xx_pwm,
 	val &= ~LPC18XX_PWM_RES_MASK(pwm->hwpwm);
 	val |= LPC18XX_PWM_RES(pwm->hwpwm, action);
 	lpc18xx_pwm_writel(lpc18xx_pwm, LPC18XX_PWM_RES_BASE, val);
-
-	mutex_unlock(&lpc18xx_pwm->res_lock);
 }
 
 static void lpc18xx_pwm_config_period(struct pwm_chip *chip, u64 period_ns)
@@ -200,8 +194,6 @@ static int lpc18xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 		return -ERANGE;
 	}
 
-	mutex_lock(&lpc18xx_pwm->period_lock);
-
 	requested_events = bitmap_weight(&lpc18xx_pwm->event_map,
 					 LPC18XX_PWM_EVENT_MAX);
 
@@ -214,7 +206,6 @@ static int lpc18xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	    lpc18xx_pwm->period_ns) {
 		dev_err(pwmchip_parent(chip), "conflicting period requested for PWM %u\n",
 			pwm->hwpwm);
-		mutex_unlock(&lpc18xx_pwm->period_lock);
 		return -EBUSY;
 	}
 
@@ -224,8 +215,6 @@ static int lpc18xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 		lpc18xx_pwm_config_period(chip, period_ns);
 	}
 
-	mutex_unlock(&lpc18xx_pwm->period_lock);
-
 	lpc18xx_pwm_config_duty(chip, pwm, duty_ns);
 
 	return 0;
@@ -377,9 +366,6 @@ static int lpc18xx_pwm_probe(struct platform_device *pdev)
 	if (lpc18xx_pwm->clk_rate > NSEC_PER_SEC)
 		return dev_err_probe(&pdev->dev, -EINVAL, "pwm clock to fast\n");
 
-	mutex_init(&lpc18xx_pwm->res_lock);
-	mutex_init(&lpc18xx_pwm->period_lock);
-
 	lpc18xx_pwm->max_period_ns =
 		mul_u64_u64_div_u64(NSEC_PER_SEC, LPC18XX_PWM_TIMER_MAX, lpc18xx_pwm->clk_rate);
 
diff --git a/drivers/pwm/pwm-mc33xs2410.c b/drivers/pwm/pwm-mc33xs2410.c
index a1ac3445ccdb..6d99e3ff7239 100644
--- a/drivers/pwm/pwm-mc33xs2410.c
+++ b/drivers/pwm/pwm-mc33xs2410.c
@@ -17,11 +17,14 @@
  *   behavior of the output pin that is neither the old nor the new state,
  *   rather something in between.
  */
+#define DEFAULT_SYMBOL_NAMESPACE		"PWM_MC33XS2410"
 
+#include <linux/auxiliary_bus.h>
 #include <linux/bitfield.h>
 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/math64.h>
+#include <linux/mc33xs2410.h>
 #include <linux/minmax.h>
 #include <linux/module.h>
 #include <linux/of.h>
@@ -120,12 +123,19 @@ static int mc33xs2410_read_reg(struct spi_device *spi, u8 reg, u16 *val, u8 flag
 	return mc33xs2410_read_regs(spi, &reg, flag, val, 1);
 }
 
-static int mc33xs2410_read_reg_ctrl(struct spi_device *spi, u8 reg, u16 *val)
+int mc33xs2410_read_reg_ctrl(struct spi_device *spi, u8 reg, u16 *val)
 {
 	return mc33xs2410_read_reg(spi, reg, val, MC33XS2410_FRAME_IN_DATA_RD);
 }
+EXPORT_SYMBOL_GPL(mc33xs2410_read_reg_ctrl);
 
-static int mc33xs2410_modify_reg(struct spi_device *spi, u8 reg, u8 mask, u8 val)
+int mc33xs2410_read_reg_diag(struct spi_device *spi, u8 reg, u16 *val)
+{
+	return mc33xs2410_read_reg(spi, reg, val, 0);
+}
+EXPORT_SYMBOL_GPL(mc33xs2410_read_reg_diag);
+
+int mc33xs2410_modify_reg(struct spi_device *spi, u8 reg, u8 mask, u8 val)
 {
 	u16 tmp;
 	int ret;
@@ -139,6 +149,7 @@ static int mc33xs2410_modify_reg(struct spi_device *spi, u8 reg, u8 mask, u8 val
 
 	return mc33xs2410_write_reg(spi, reg, tmp);
 }
+EXPORT_SYMBOL_GPL(mc33xs2410_modify_reg);
 
 static u8 mc33xs2410_pwm_get_freq(u64 period)
 {
@@ -314,6 +325,7 @@ static int mc33xs2410_reset(struct device *dev)
 static int mc33xs2410_probe(struct spi_device *spi)
 {
 	struct device *dev = &spi->dev;
+	struct auxiliary_device *adev;
 	struct pwm_chip *chip;
 	int ret;
 
@@ -361,6 +373,10 @@ static int mc33xs2410_probe(struct spi_device *spi)
 	if (ret < 0)
 		return dev_err_probe(dev, ret, "Failed to add pwm chip\n");
 
+	adev = devm_auxiliary_device_create(dev, "hwmon", NULL);
+	if (!adev)
+		return dev_err_probe(dev, -ENODEV, "Failed to register hwmon device\n");
+
 	return 0;
 }
 
diff --git a/drivers/pwm/pwm-mediatek.c b/drivers/pwm/pwm-mediatek.c
index 33d3554b9197..6777c511622a 100644
--- a/drivers/pwm/pwm-mediatek.c
+++ b/drivers/pwm/pwm-mediatek.c
@@ -29,6 +29,7 @@
 #define PWM45DWIDTH_FIXUP	0x30
 #define PWMTHRES		0x30
 #define PWM45THRES_FIXUP	0x34
+#define PWM_CK_26M_SEL_V3	0x74
 #define PWM_CK_26M_SEL		0x210
 
 #define PWM_CLK_DIV_MAX		7
@@ -36,7 +37,7 @@
 struct pwm_mediatek_of_data {
 	unsigned int num_pwms;
 	bool pwm45_fixup;
-	bool has_ck_26m_sel;
+	u16 pwm_ck_26m_sel_reg;
 	const unsigned int *reg_offset;
 };
 
@@ -64,6 +65,11 @@ static const unsigned int mtk_pwm_reg_offset_v2[] = {
 	0x0080, 0x00c0, 0x0100, 0x0140, 0x0180, 0x01c0, 0x0200, 0x0240
 };
 
+/* PWM IP Version 3.0.2 */
+static const unsigned int mtk_pwm_reg_offset_v3[] = {
+	0x0100, 0x0200, 0x0300, 0x0400, 0x0500, 0x0600, 0x0700, 0x0800
+};
+
 static inline struct pwm_mediatek_chip *
 to_pwm_mediatek_chip(struct pwm_chip *chip)
 {
@@ -136,8 +142,8 @@ static int pwm_mediatek_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	}
 
 	/* Make sure we use the bus clock and not the 26MHz clock */
-	if (pc->soc->has_ck_26m_sel)
-		writel(0, pc->regs + PWM_CK_26M_SEL);
+	if (pc->soc->pwm_ck_26m_sel_reg)
+		writel(0, pc->regs + pc->soc->pwm_ck_26m_sel_reg);
 
 	/* Using resolution in picosecond gets accuracy higher */
 	resolution = (u64)NSEC_PER_SEC * 1000;
@@ -294,90 +300,92 @@ static int pwm_mediatek_probe(struct platform_device *pdev)
 static const struct pwm_mediatek_of_data mt2712_pwm_data = {
 	.num_pwms = 8,
 	.pwm45_fixup = false,
-	.has_ck_26m_sel = false,
 	.reg_offset = mtk_pwm_reg_offset_v1,
 };
 
 static const struct pwm_mediatek_of_data mt6795_pwm_data = {
 	.num_pwms = 7,
 	.pwm45_fixup = false,
-	.has_ck_26m_sel = false,
 	.reg_offset = mtk_pwm_reg_offset_v1,
 };
 
 static const struct pwm_mediatek_of_data mt7622_pwm_data = {
 	.num_pwms = 6,
 	.pwm45_fixup = false,
-	.has_ck_26m_sel = true,
+	.pwm_ck_26m_sel_reg = PWM_CK_26M_SEL,
 	.reg_offset = mtk_pwm_reg_offset_v1,
 };
 
 static const struct pwm_mediatek_of_data mt7623_pwm_data = {
 	.num_pwms = 5,
 	.pwm45_fixup = true,
-	.has_ck_26m_sel = false,
 	.reg_offset = mtk_pwm_reg_offset_v1,
 };
 
 static const struct pwm_mediatek_of_data mt7628_pwm_data = {
 	.num_pwms = 4,
 	.pwm45_fixup = true,
-	.has_ck_26m_sel = false,
 	.reg_offset = mtk_pwm_reg_offset_v1,
 };
 
 static const struct pwm_mediatek_of_data mt7629_pwm_data = {
 	.num_pwms = 1,
 	.pwm45_fixup = false,
-	.has_ck_26m_sel = false,
 	.reg_offset = mtk_pwm_reg_offset_v1,
 };
 
 static const struct pwm_mediatek_of_data mt7981_pwm_data = {
 	.num_pwms = 3,
 	.pwm45_fixup = false,
-	.has_ck_26m_sel = true,
+	.pwm_ck_26m_sel_reg = PWM_CK_26M_SEL,
 	.reg_offset = mtk_pwm_reg_offset_v2,
 };
 
 static const struct pwm_mediatek_of_data mt7986_pwm_data = {
 	.num_pwms = 2,
 	.pwm45_fixup = false,
-	.has_ck_26m_sel = true,
+	.pwm_ck_26m_sel_reg = PWM_CK_26M_SEL,
 	.reg_offset = mtk_pwm_reg_offset_v1,
 };
 
 static const struct pwm_mediatek_of_data mt7988_pwm_data = {
 	.num_pwms = 8,
 	.pwm45_fixup = false,
-	.has_ck_26m_sel = false,
 	.reg_offset = mtk_pwm_reg_offset_v2,
 };
 
 static const struct pwm_mediatek_of_data mt8183_pwm_data = {
 	.num_pwms = 4,
 	.pwm45_fixup = false,
-	.has_ck_26m_sel = true,
+	.pwm_ck_26m_sel_reg = PWM_CK_26M_SEL,
 	.reg_offset = mtk_pwm_reg_offset_v1,
 };
 
 static const struct pwm_mediatek_of_data mt8365_pwm_data = {
 	.num_pwms = 3,
 	.pwm45_fixup = false,
-	.has_ck_26m_sel = true,
+	.pwm_ck_26m_sel_reg = PWM_CK_26M_SEL,
 	.reg_offset = mtk_pwm_reg_offset_v1,
 };
 
 static const struct pwm_mediatek_of_data mt8516_pwm_data = {
 	.num_pwms = 5,
 	.pwm45_fixup = false,
-	.has_ck_26m_sel = true,
+	.pwm_ck_26m_sel_reg = PWM_CK_26M_SEL,
 	.reg_offset = mtk_pwm_reg_offset_v1,
 };
 
+static const struct pwm_mediatek_of_data mt6991_pwm_data = {
+	.num_pwms = 4,
+	.pwm45_fixup = false,
+	.pwm_ck_26m_sel_reg = PWM_CK_26M_SEL_V3,
+	.reg_offset = mtk_pwm_reg_offset_v3,
+};
+
 static const struct of_device_id pwm_mediatek_of_match[] = {
 	{ .compatible = "mediatek,mt2712-pwm", .data = &mt2712_pwm_data },
 	{ .compatible = "mediatek,mt6795-pwm", .data = &mt6795_pwm_data },
+	{ .compatible = "mediatek,mt6991-pwm", .data = &mt6991_pwm_data },
 	{ .compatible = "mediatek,mt7622-pwm", .data = &mt7622_pwm_data },
 	{ .compatible = "mediatek,mt7623-pwm", .data = &mt7623_pwm_data },
 	{ .compatible = "mediatek,mt7628-pwm", .data = &mt7628_pwm_data },
diff --git a/drivers/pwm/pwm-microchip-core.c b/drivers/pwm/pwm-microchip-core.c
index 12821b4bbf97..4ff32bb4c205 100644
--- a/drivers/pwm/pwm-microchip-core.c
+++ b/drivers/pwm/pwm-microchip-core.c
@@ -36,7 +36,6 @@
 #include <linux/ktime.h>
 #include <linux/math.h>
 #include <linux/module.h>
-#include <linux/mutex.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pwm.h>
@@ -56,7 +55,6 @@
 struct mchp_core_pwm_chip {
 	struct clk *clk;
 	void __iomem *base;
-	struct mutex lock; /* protects the shared period */
 	ktime_t update_timestamp;
 	u32 sync_update_mask;
 	u16 channel_enabled;
@@ -360,17 +358,10 @@ static int mchp_core_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 			       const struct pwm_state *state)
 {
 	struct mchp_core_pwm_chip *mchp_core_pwm = to_mchp_core_pwm(chip);
-	int ret;
-
-	mutex_lock(&mchp_core_pwm->lock);
 
 	mchp_core_pwm_wait_for_sync_update(mchp_core_pwm, pwm->hwpwm);
 
-	ret = mchp_core_pwm_apply_locked(chip, pwm, state);
-
-	mutex_unlock(&mchp_core_pwm->lock);
-
-	return ret;
+	return mchp_core_pwm_apply_locked(chip, pwm, state);
 }
 
 static int mchp_core_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -381,8 +372,6 @@ static int mchp_core_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm
 	u16 prescale, period_steps;
 	u8 duty_steps, posedge, negedge;
 
-	mutex_lock(&mchp_core_pwm->lock);
-
 	mchp_core_pwm_wait_for_sync_update(mchp_core_pwm, pwm->hwpwm);
 
 	if (mchp_core_pwm->channel_enabled & (1 << pwm->hwpwm))
@@ -415,8 +404,6 @@ static int mchp_core_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm
 	posedge = readb_relaxed(mchp_core_pwm->base + MCHPCOREPWM_POSEDGE(pwm->hwpwm));
 	negedge = readb_relaxed(mchp_core_pwm->base + MCHPCOREPWM_NEGEDGE(pwm->hwpwm));
 
-	mutex_unlock(&mchp_core_pwm->lock);
-
 	if (negedge == posedge) {
 		state->duty_cycle = state->period;
 		state->period *= 2;
@@ -469,8 +456,6 @@ static int mchp_core_pwm_probe(struct platform_device *pdev)
 				 &mchp_core_pwm->sync_update_mask))
 		mchp_core_pwm->sync_update_mask = 0;
 
-	mutex_init(&mchp_core_pwm->lock);
-
 	chip->ops = &mchp_core_pwm_ops;
 
 	mchp_core_pwm->channel_enabled = readb_relaxed(mchp_core_pwm->base + MCHPCOREPWM_EN(0));
diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c
index 8a4a3d2df30d..0f5bdb0e395e 100644
--- a/drivers/pwm/pwm-pxa.c
+++ b/drivers/pwm/pwm-pxa.c
@@ -25,6 +25,7 @@
 #include <linux/io.h>
 #include <linux/pwm.h>
 #include <linux/of.h>
+#include <linux/reset.h>
 
 #include <asm/div64.h>
 
@@ -161,6 +162,7 @@ static int pwm_probe(struct platform_device *pdev)
 	struct pwm_chip *chip;
 	struct pxa_pwm_chip *pc;
 	struct device *dev = &pdev->dev;
+	struct reset_control *rst;
 	int ret = 0;
 
 	if (IS_ENABLED(CONFIG_OF) && id == NULL)
@@ -179,6 +181,10 @@ static int pwm_probe(struct platform_device *pdev)
 	if (IS_ERR(pc->clk))
 		return dev_err_probe(dev, PTR_ERR(pc->clk), "Failed to get clock\n");
 
+	rst = devm_reset_control_get_optional_exclusive_deasserted(dev, NULL);
+	if (IS_ERR(rst))
+		return PTR_ERR(rst);
+
 	chip->ops = &pxa_pwm_ops;
 
 	if (IS_ENABLED(CONFIG_OF))
diff --git a/drivers/pwm/pwm-rockchip.c b/drivers/pwm/pwm-rockchip.c
index c5f50e5eaf41..67b85bdb491b 100644
--- a/drivers/pwm/pwm-rockchip.c
+++ b/drivers/pwm/pwm-rockchip.c
@@ -8,6 +8,8 @@
 
 #include <linux/clk.h>
 #include <linux/io.h>
+#include <linux/limits.h>
+#include <linux/math64.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
@@ -61,6 +63,7 @@ static int rockchip_pwm_get_state(struct pwm_chip *chip,
 				  struct pwm_state *state)
 {
 	struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip);
+	u64 prescaled_ns = (u64)pc->data->prescaler * NSEC_PER_SEC;
 	u32 enable_conf = pc->data->enable_conf;
 	unsigned long clk_rate;
 	u64 tmp;
@@ -78,12 +81,12 @@ static int rockchip_pwm_get_state(struct pwm_chip *chip,
 	clk_rate = clk_get_rate(pc->clk);
 
 	tmp = readl_relaxed(pc->base + pc->data->regs.period);
-	tmp *= pc->data->prescaler * NSEC_PER_SEC;
-	state->period = DIV_ROUND_CLOSEST_ULL(tmp, clk_rate);
+	tmp *= prescaled_ns;
+	state->period = DIV_U64_ROUND_UP(tmp, clk_rate);
 
 	tmp = readl_relaxed(pc->base + pc->data->regs.duty);
-	tmp *= pc->data->prescaler * NSEC_PER_SEC;
-	state->duty_cycle =  DIV_ROUND_CLOSEST_ULL(tmp, clk_rate);
+	tmp *= prescaled_ns;
+	state->duty_cycle =  DIV_U64_ROUND_UP(tmp, clk_rate);
 
 	val = readl_relaxed(pc->base + pc->data->regs.ctrl);
 	state->enabled = (val & enable_conf) == enable_conf;
@@ -103,8 +106,9 @@ static void rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 			       const struct pwm_state *state)
 {
 	struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip);
-	unsigned long period, duty;
-	u64 clk_rate, div;
+	u64 prescaled_ns = (u64)pc->data->prescaler * NSEC_PER_SEC;
+	u64 clk_rate, tmp;
+	u32 period_ticks, duty_ticks;
 	u32 ctrl;
 
 	clk_rate = clk_get_rate(pc->clk);
@@ -114,12 +118,15 @@ static void rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	 * bits, every possible input period can be obtained using the
 	 * default prescaler value for all practical clock rate values.
 	 */
-	div = clk_rate * state->period;
-	period = DIV_ROUND_CLOSEST_ULL(div,
-				       pc->data->prescaler * NSEC_PER_SEC);
+	tmp = mul_u64_u64_div_u64(clk_rate, state->period, prescaled_ns);
+	if (tmp > U32_MAX)
+		tmp = U32_MAX;
+	period_ticks = tmp;
 
-	div = clk_rate * state->duty_cycle;
-	duty = DIV_ROUND_CLOSEST_ULL(div, pc->data->prescaler * NSEC_PER_SEC);
+	tmp = mul_u64_u64_div_u64(clk_rate, state->duty_cycle, prescaled_ns);
+	if (tmp > U32_MAX)
+		tmp = U32_MAX;
+	duty_ticks = tmp;
 
 	/*
 	 * Lock the period and duty of previous configuration, then
@@ -131,8 +138,8 @@ static void rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 		writel_relaxed(ctrl, pc->base + pc->data->regs.ctrl);
 	}
 
-	writel(period, pc->base + pc->data->regs.period);
-	writel(duty, pc->base + pc->data->regs.duty);
+	writel(period_ticks, pc->base + pc->data->regs.period);
+	writel(duty_ticks, pc->base + pc->data->regs.duty);
 
 	if (pc->data->supports_polarity) {
 		ctrl &= ~PWM_POLARITY_MASK;
diff --git a/drivers/pwm/pwm-sifive.c b/drivers/pwm/pwm-sifive.c
index d5b647e6be78..4a07315b0744 100644
--- a/drivers/pwm/pwm-sifive.c
+++ b/drivers/pwm/pwm-sifive.c
@@ -4,11 +4,28 @@
  * For SiFive's PWM IP block documentation please refer Chapter 14 of
  * Reference Manual : https://static.dev.sifive.com/FU540-C000-v1.0.pdf
  *
+ * PWM output inversion: According to the SiFive Reference manual
+ * the output of each comparator is high whenever the value of pwms is
+ * greater than or equal to the corresponding pwmcmpX[Reference Manual].
+ *
+ * Figure 29 in the same manual shows that the pwmcmpXcenter bit is
+ * hard-tied to 0 (XNOR), which effectively inverts the comparison so that
+ * the output goes HIGH when  `pwms < pwmcmpX`.
+ *
+ * In other words, each pwmcmp register actually defines the **inactive**
+ * (low) period of the pulse, not the active time exactly opposite to what
+ * the documentation text implies.
+ *
+ * To compensate, this driver always **inverts** the duty value when reading
+ * or writing pwmcmp registers , so that users interact with a conventional
+ * **active-high** PWM interface.
+ *
+ *
  * Limitations:
  * - When changing both duty cycle and period, we cannot prevent in
  *   software that the output might produce a period with mixed
  *   settings (new period length and old duty cycle).
- * - The hardware cannot generate a 100% duty cycle.
+ * - The hardware cannot generate a 0% duty cycle.
  * - The hardware generates only inverted output.
  */
 #include <linux/clk.h>
@@ -101,7 +118,7 @@ static void pwm_sifive_update_clock(struct pwm_sifive_ddata *ddata,
 
 	/* As scale <= 15 the shift operation cannot overflow. */
 	num = (unsigned long long)NSEC_PER_SEC << (PWM_SIFIVE_CMPWIDTH + scale);
-	ddata->real_period = div64_ul(num, rate);
+	ddata->real_period = DIV_ROUND_UP_ULL(num, rate);
 	dev_dbg(ddata->parent,
 		"New real_period = %u ns\n", ddata->real_period);
 }
@@ -110,9 +127,14 @@ static int pwm_sifive_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 				struct pwm_state *state)
 {
 	struct pwm_sifive_ddata *ddata = pwm_sifive_chip_to_ddata(chip);
-	u32 duty, val;
+	u32 duty, val, inactive;
 
-	duty = readl(ddata->regs + PWM_SIFIVE_PWMCMP(pwm->hwpwm));
+	inactive = readl(ddata->regs + PWM_SIFIVE_PWMCMP(pwm->hwpwm));
+	/*
+	 * PWM hardware uses 'inactive' counts in pwmcmp, so invert to get actual duty.
+	 * Here, 'inactive' is the low time and we compute duty as max_count - inactive.
+	 */
+	duty = (1U << PWM_SIFIVE_CMPWIDTH) - 1 - inactive;
 
 	state->enabled = duty > 0;
 
@@ -121,9 +143,9 @@ static int pwm_sifive_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 		state->enabled = false;
 
 	state->period = ddata->real_period;
-	state->duty_cycle =
-		(u64)duty * ddata->real_period >> PWM_SIFIVE_CMPWIDTH;
-	state->polarity = PWM_POLARITY_INVERSED;
+	state->duty_cycle = DIV_ROUND_UP_ULL((u64)duty * ddata->real_period,
+					     (1U << PWM_SIFIVE_CMPWIDTH));
+	state->polarity = PWM_POLARITY_NORMAL;
 
 	return 0;
 }
@@ -137,9 +159,10 @@ static int pwm_sifive_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	unsigned long long num;
 	bool enabled;
 	int ret = 0;
-	u32 frac;
+	u64 frac;
+	u32 inactive;
 
-	if (state->polarity != PWM_POLARITY_INVERSED)
+	if (state->polarity != PWM_POLARITY_NORMAL)
 		return -EINVAL;
 
 	cur_state = pwm->state;
@@ -156,9 +179,12 @@ static int pwm_sifive_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	 * consecutively
 	 */
 	num = (u64)duty_cycle * (1U << PWM_SIFIVE_CMPWIDTH);
-	frac = DIV64_U64_ROUND_CLOSEST(num, state->period);
-	/* The hardware cannot generate a 100% duty cycle */
-	frac = min(frac, (1U << PWM_SIFIVE_CMPWIDTH) - 1);
+	frac = num;
+	do_div(frac, state->period);
+	/* The hardware cannot generate a 0% duty cycle */
+	frac = min(frac, (u64)(1U << PWM_SIFIVE_CMPWIDTH) - 1);
+	/* pwmcmp register must be loaded with the inactive(invert the duty) */
+	inactive = (1U << PWM_SIFIVE_CMPWIDTH) - 1 - frac;
 
 	mutex_lock(&ddata->lock);
 	if (state->period != ddata->approx_period) {
@@ -190,7 +216,7 @@ static int pwm_sifive_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 		}
 	}
 
-	writel(frac, ddata->regs + PWM_SIFIVE_PWMCMP(pwm->hwpwm));
+	writel(inactive, ddata->regs + PWM_SIFIVE_PWMCMP(pwm->hwpwm));
 
 	if (!state->enabled)
 		clk_disable(ddata->clk);
diff --git a/drivers/pwm/pwm-sophgo-sg2042.c b/drivers/pwm/pwm-sophgo-sg2042.c
index ff4639d849ce..7d07b0ca7d29 100644
--- a/drivers/pwm/pwm-sophgo-sg2042.c
+++ b/drivers/pwm/pwm-sophgo-sg2042.c
@@ -13,6 +13,7 @@
  *   the running period.
  * - When PERIOD and HLPERIOD is set to 0, the PWM wave output will
  *   be stopped and the output is pulled to high.
+ * - SG2044 supports both polarities, SG2042 only normal polarity.
  * See the datasheet [1] for more details.
  * [1]:https://github.com/sophgo/sophgo-doc/tree/main/SG2042/TRM
  */
@@ -41,6 +42,10 @@
 #define SG2042_PWM_HLPERIOD(chan) ((chan) * 8 + 0)
 #define SG2042_PWM_PERIOD(chan) ((chan) * 8 + 4)
 
+#define SG2044_PWM_POLARITY		0x40
+#define SG2044_PWM_PWMSTART		0x44
+#define SG2044_PWM_OE			0xd0
+
 #define SG2042_PWM_CHANNELNUM	4
 
 /**
@@ -53,6 +58,10 @@ struct sg2042_pwm_ddata {
 	unsigned long clk_rate_hz;
 };
 
+struct sg2042_chip_data {
+	const struct pwm_ops ops;
+};
+
 /*
  * period_ticks: PERIOD
  * hlperiod_ticks: HLPERIOD
@@ -66,21 +75,13 @@ static void pwm_sg2042_config(struct sg2042_pwm_ddata *ddata, unsigned int chan,
 	writel(hlperiod_ticks, base + SG2042_PWM_HLPERIOD(chan));
 }
 
-static int pwm_sg2042_apply(struct pwm_chip *chip, struct pwm_device *pwm,
-			    const struct pwm_state *state)
+static void pwm_sg2042_set_dutycycle(struct pwm_chip *chip, struct pwm_device *pwm,
+				     const struct pwm_state *state)
 {
 	struct sg2042_pwm_ddata *ddata = pwmchip_get_drvdata(chip);
 	u32 hlperiod_ticks;
 	u32 period_ticks;
 
-	if (state->polarity == PWM_POLARITY_INVERSED)
-		return -EINVAL;
-
-	if (!state->enabled) {
-		pwm_sg2042_config(ddata, pwm->hwpwm, 0, 0);
-		return 0;
-	}
-
 	/*
 	 * Duration of High level (duty_cycle) = HLPERIOD x Period_of_input_clk
 	 * Duration of One Cycle (period) = PERIOD x Period_of_input_clk
@@ -88,10 +89,26 @@ static int pwm_sg2042_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	period_ticks = min(mul_u64_u64_div_u64(ddata->clk_rate_hz, state->period, NSEC_PER_SEC), U32_MAX);
 	hlperiod_ticks = min(mul_u64_u64_div_u64(ddata->clk_rate_hz, state->duty_cycle, NSEC_PER_SEC), U32_MAX);
 
-	dev_dbg(pwmchip_parent(chip), "chan[%u]: PERIOD=%u, HLPERIOD=%u\n",
-		pwm->hwpwm, period_ticks, hlperiod_ticks);
+	dev_dbg(pwmchip_parent(chip), "chan[%u]: ENABLE=%u, PERIOD=%u, HLPERIOD=%u, POLARITY=%u\n",
+		pwm->hwpwm, state->enabled, period_ticks, hlperiod_ticks, state->polarity);
 
 	pwm_sg2042_config(ddata, pwm->hwpwm, period_ticks, hlperiod_ticks);
+}
+
+static int pwm_sg2042_apply(struct pwm_chip *chip, struct pwm_device *pwm,
+			    const struct pwm_state *state)
+{
+	struct sg2042_pwm_ddata *ddata = pwmchip_get_drvdata(chip);
+
+	if (state->polarity == PWM_POLARITY_INVERSED)
+		return -EINVAL;
+
+	if (!state->enabled) {
+		pwm_sg2042_config(ddata, pwm->hwpwm, 0, 0);
+		return 0;
+	}
+
+	pwm_sg2042_set_dutycycle(chip, pwm, state);
 
 	return 0;
 }
@@ -123,13 +140,97 @@ static int pwm_sg2042_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 	return 0;
 }
 
-static const struct pwm_ops pwm_sg2042_ops = {
-	.apply = pwm_sg2042_apply,
-	.get_state = pwm_sg2042_get_state,
+static void pwm_sg2044_set_outputen(struct sg2042_pwm_ddata *ddata, struct pwm_device *pwm,
+				    bool enabled)
+{
+	u32 pwmstart;
+
+	pwmstart = readl(ddata->base + SG2044_PWM_PWMSTART);
+
+	if (enabled)
+		pwmstart |= BIT(pwm->hwpwm);
+	else
+		pwmstart &= ~BIT(pwm->hwpwm);
+
+	writel(pwmstart, ddata->base + SG2044_PWM_PWMSTART);
+}
+
+static void pwm_sg2044_set_outputdir(struct sg2042_pwm_ddata *ddata, struct pwm_device *pwm,
+				     bool enabled)
+{
+	u32 pwm_oe;
+
+	pwm_oe = readl(ddata->base + SG2044_PWM_OE);
+
+	if (enabled)
+		pwm_oe |= BIT(pwm->hwpwm);
+	else
+		pwm_oe &= ~BIT(pwm->hwpwm);
+
+	writel(pwm_oe, ddata->base + SG2044_PWM_OE);
+}
+
+static void pwm_sg2044_set_polarity(struct sg2042_pwm_ddata *ddata, struct pwm_device *pwm,
+				    const struct pwm_state *state)
+{
+	u32 pwm_polarity;
+
+	pwm_polarity = readl(ddata->base + SG2044_PWM_POLARITY);
+
+	if (state->polarity == PWM_POLARITY_NORMAL)
+		pwm_polarity &= ~BIT(pwm->hwpwm);
+	else
+		pwm_polarity |= BIT(pwm->hwpwm);
+
+	writel(pwm_polarity, ddata->base + SG2044_PWM_POLARITY);
+}
+
+static int pwm_sg2044_apply(struct pwm_chip *chip, struct pwm_device *pwm,
+			    const struct pwm_state *state)
+{
+	struct sg2042_pwm_ddata *ddata = pwmchip_get_drvdata(chip);
+
+	pwm_sg2044_set_polarity(ddata, pwm, state);
+
+	pwm_sg2042_set_dutycycle(chip, pwm, state);
+
+	/*
+	 * re-enable PWMSTART to refresh the register period
+	 */
+	pwm_sg2044_set_outputen(ddata, pwm, false);
+
+	if (!state->enabled)
+		return 0;
+
+	pwm_sg2044_set_outputdir(ddata, pwm, true);
+	pwm_sg2044_set_outputen(ddata, pwm, true);
+
+	return 0;
+}
+
+static const struct sg2042_chip_data sg2042_chip_data = {
+	.ops = {
+		.apply = pwm_sg2042_apply,
+		.get_state = pwm_sg2042_get_state,
+	},
+};
+
+static const struct sg2042_chip_data sg2044_chip_data = {
+	.ops = {
+		.apply = pwm_sg2044_apply,
+		.get_state = pwm_sg2042_get_state,
+	},
 };
 
 static const struct of_device_id sg2042_pwm_ids[] = {
-	{ .compatible = "sophgo,sg2042-pwm" },
+	{
+		.compatible = "sophgo,sg2042-pwm",
+		.data = &sg2042_chip_data
+	},
+	{
+		.compatible = "sophgo,sg2044-pwm",
+		.data = &sg2044_chip_data
+	},
 	{ }
 };
 MODULE_DEVICE_TABLE(of, sg2042_pwm_ids);
@@ -137,12 +238,17 @@ MODULE_DEVICE_TABLE(of, sg2042_pwm_ids);
 static int pwm_sg2042_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	const struct sg2042_chip_data *chip_data;
 	struct sg2042_pwm_ddata *ddata;
 	struct reset_control *rst;
 	struct pwm_chip *chip;
 	struct clk *clk;
 	int ret;
 
+	chip_data = device_get_match_data(dev);
+	if (!chip_data)
+		return -ENODEV;
+
 	chip = devm_pwmchip_alloc(dev, SG2042_PWM_CHANNELNUM, sizeof(*ddata));
 	if (IS_ERR(chip))
 		return PTR_ERR(chip);
@@ -170,7 +276,7 @@ static int pwm_sg2042_probe(struct platform_device *pdev)
 	if (IS_ERR(rst))
 		return dev_err_probe(dev, PTR_ERR(rst), "Failed to get reset\n");
 
-	chip->ops = &pwm_sg2042_ops;
+	chip->ops = &chip_data->ops;
 	chip->atomic = true;
 
 	ret = devm_pwmchip_add(dev, chip);
@@ -190,5 +296,6 @@ static struct platform_driver pwm_sg2042_driver = {
 module_platform_driver(pwm_sg2042_driver);
 
 MODULE_AUTHOR("Chen Wang");
+MODULE_AUTHOR("Longbin Li <looong.bin@gmail.com>");
 MODULE_DESCRIPTION("Sophgo SG2042 PWM driver");
 MODULE_LICENSE("GPL");
diff --git a/drivers/pwm/pwm-sti.c b/drivers/pwm/pwm-sti.c
index 396b52672ce0..3b702b8f0c7f 100644
--- a/drivers/pwm/pwm-sti.c
+++ b/drivers/pwm/pwm-sti.c
@@ -92,7 +92,6 @@ struct sti_pwm_chip {
 	struct pwm_device *cur;
 	unsigned long configured;
 	unsigned int en_count;
-	struct mutex sti_pwm_lock; /* To sync between enable/disable calls */
 	void __iomem *mmio;
 };
 
@@ -244,55 +243,46 @@ static int sti_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 {
 	struct sti_pwm_chip *pc = to_sti_pwmchip(chip);
 	struct device *dev = pc->dev;
-	int ret = 0;
+	int ret;
 
 	/*
 	 * Since we have a common enable for all PWM devices, do not enable if
 	 * already enabled.
 	 */
-	mutex_lock(&pc->sti_pwm_lock);
 
 	if (!pc->en_count) {
 		ret = clk_enable(pc->pwm_clk);
 		if (ret)
-			goto out;
+			return ret;
 
 		ret = clk_enable(pc->cpt_clk);
 		if (ret)
-			goto out;
+			return ret;
 
 		ret = regmap_field_write(pc->pwm_out_en, 1);
 		if (ret) {
 			dev_err(dev, "failed to enable PWM device %u: %d\n",
 				pwm->hwpwm, ret);
-			goto out;
+			return ret;
 		}
 	}
 
 	pc->en_count++;
 
-out:
-	mutex_unlock(&pc->sti_pwm_lock);
-	return ret;
+	return 0;
 }
 
 static void sti_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 {
 	struct sti_pwm_chip *pc = to_sti_pwmchip(chip);
 
-	mutex_lock(&pc->sti_pwm_lock);
-
-	if (--pc->en_count) {
-		mutex_unlock(&pc->sti_pwm_lock);
+	if (--pc->en_count)
 		return;
-	}
 
 	regmap_field_write(pc->pwm_out_en, 0);
 
 	clk_disable(pc->pwm_clk);
 	clk_disable(pc->cpt_clk);
-
-	mutex_unlock(&pc->sti_pwm_lock);
 }
 
 static void sti_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
@@ -594,7 +584,6 @@ static int sti_pwm_probe(struct platform_device *pdev)
 
 	pc->dev = dev;
 	pc->en_count = 0;
-	mutex_init(&pc->sti_pwm_lock);
 
 	ret = sti_pwm_probe_regmap(pc);
 	if (ret)
diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c
index 4b148f0afeb9..2594fb771b04 100644
--- a/drivers/pwm/pwm-stm32.c
+++ b/drivers/pwm/pwm-stm32.c
@@ -19,6 +19,7 @@
 #define CCMR_CHANNEL_SHIFT 8
 #define CCMR_CHANNEL_MASK  0xFF
 #define MAX_BREAKINPUT 2
+#define STM32_MAX_PWM_OUTPUT 4
 
 struct stm32_breakinput {
 	u32 index;
@@ -768,10 +769,19 @@ static int stm32_pwm_probe_breakinputs(struct stm32_pwm *priv,
 	return stm32_pwm_apply_breakinputs(priv);
 }
 
-static void stm32_pwm_detect_complementary(struct stm32_pwm *priv)
+static void stm32_pwm_detect_complementary(struct stm32_pwm *priv, struct stm32_timers *ddata)
 {
 	u32 ccer;
 
+	if (ddata->ipidr) {
+		u32 val;
+
+		/* Simply read from HWCFGR the number of complementary outputs (MP25). */
+		regmap_read(priv->regmap, TIM_HWCFGR1, &val);
+		priv->have_complementary_output = !!FIELD_GET(TIM_HWCFGR1_NB_OF_DT, val);
+		return;
+	}
+
 	/*
 	 * If complementary bit doesn't exist writing 1 will have no
 	 * effect so we can detect it.
@@ -783,22 +793,39 @@ static void stm32_pwm_detect_complementary(struct stm32_pwm *priv)
 	priv->have_complementary_output = (ccer != 0);
 }
 
-static unsigned int stm32_pwm_detect_channels(struct regmap *regmap,
+static unsigned int stm32_pwm_detect_channels(struct stm32_timers *ddata,
 					      unsigned int *num_enabled)
 {
+	struct regmap *regmap = ddata->regmap;
 	u32 ccer, ccer_backup;
 
+	regmap_read(regmap, TIM_CCER, &ccer_backup);
+	*num_enabled = hweight32(ccer_backup & TIM_CCER_CCXE);
+
+	if (ddata->ipidr) {
+		u32 hwcfgr;
+		unsigned int npwm;
+
+		/* Deduce from HWCFGR the number of outputs (MP25). */
+		regmap_read(regmap, TIM_HWCFGR1, &hwcfgr);
+
+		/*
+		 * Timers may have more capture/compare channels than the
+		 * actual number of PWM channel outputs (e.g. TIM_CH[1..4]).
+		 */
+		npwm = FIELD_GET(TIM_HWCFGR1_NB_OF_CC, hwcfgr);
+
+		return npwm < STM32_MAX_PWM_OUTPUT ? npwm : STM32_MAX_PWM_OUTPUT;
+	}
+
 	/*
 	 * If channels enable bits don't exist writing 1 will have no
 	 * effect so we can detect and count them.
 	 */
-	regmap_read(regmap, TIM_CCER, &ccer_backup);
 	regmap_set_bits(regmap, TIM_CCER, TIM_CCER_CCXE);
 	regmap_read(regmap, TIM_CCER, &ccer);
 	regmap_write(regmap, TIM_CCER, ccer_backup);
 
-	*num_enabled = hweight32(ccer_backup & TIM_CCER_CCXE);
-
 	return hweight32(ccer & TIM_CCER_CCXE);
 }
 
@@ -813,7 +840,7 @@ static int stm32_pwm_probe(struct platform_device *pdev)
 	unsigned int i;
 	int ret;
 
-	npwm = stm32_pwm_detect_channels(ddata->regmap, &num_enabled);
+	npwm = stm32_pwm_detect_channels(ddata, &num_enabled);
 
 	chip = devm_pwmchip_alloc(dev, npwm, sizeof(*priv));
 	if (IS_ERR(chip))
@@ -834,7 +861,7 @@ static int stm32_pwm_probe(struct platform_device *pdev)
 		return dev_err_probe(dev, ret,
 				     "Failed to configure breakinputs\n");
 
-	stm32_pwm_detect_complementary(priv);
+	stm32_pwm_detect_complementary(priv, ddata);
 
 	ret = devm_clk_rate_exclusive_get(dev, priv->clk);
 	if (ret)
@@ -907,6 +934,7 @@ static DEFINE_SIMPLE_DEV_PM_OPS(stm32_pwm_pm_ops, stm32_pwm_suspend, stm32_pwm_r
 
 static const struct of_device_id stm32_pwm_of_match[] = {
 	{ .compatible = "st,stm32-pwm",	},
+	{ .compatible = "st,stm32mp25-pwm", },
 	{ /* end node */ },
 };
 MODULE_DEVICE_TABLE(of, stm32_pwm_of_match);
diff --git a/drivers/pwm/pwm-sun4i.c b/drivers/pwm/pwm-sun4i.c
index e60dc7d6b591..6c5591ca868b 100644
--- a/drivers/pwm/pwm-sun4i.c
+++ b/drivers/pwm/pwm-sun4i.c
@@ -21,7 +21,6 @@
 #include <linux/pwm.h>
 #include <linux/reset.h>
 #include <linux/slab.h>
-#include <linux/spinlock.h>
 #include <linux/time.h>
 
 #define PWM_CTRL_REG		0x0
@@ -85,7 +84,6 @@ struct sun4i_pwm_chip {
 	struct clk *clk;
 	struct reset_control *rst;
 	void __iomem *base;
-	spinlock_t ctrl_lock;
 	const struct sun4i_pwm_data *data;
 };
 
@@ -258,7 +256,6 @@ static int sun4i_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 		return ret;
 	}
 
-	spin_lock(&sun4ichip->ctrl_lock);
 	ctrl = sun4i_pwm_readl(sun4ichip, PWM_CTRL_REG);
 
 	if (sun4ichip->data->has_direct_mod_clk_output) {
@@ -266,7 +263,6 @@ static int sun4i_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 			ctrl |= BIT_CH(PWM_BYPASS, pwm->hwpwm);
 			/* We can skip other parameter */
 			sun4i_pwm_writel(sun4ichip, ctrl, PWM_CTRL_REG);
-			spin_unlock(&sun4ichip->ctrl_lock);
 			return 0;
 		}
 
@@ -297,8 +293,6 @@ static int sun4i_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	sun4i_pwm_writel(sun4ichip, ctrl, PWM_CTRL_REG);
 
-	spin_unlock(&sun4ichip->ctrl_lock);
-
 	if (state->enabled)
 		return 0;
 
@@ -309,12 +303,10 @@ static int sun4i_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	else
 		usleep_range(delay_us, delay_us * 2);
 
-	spin_lock(&sun4ichip->ctrl_lock);
 	ctrl = sun4i_pwm_readl(sun4ichip, PWM_CTRL_REG);
 	ctrl &= ~BIT_CH(PWM_CLK_GATING, pwm->hwpwm);
 	ctrl &= ~BIT_CH(PWM_EN, pwm->hwpwm);
 	sun4i_pwm_writel(sun4ichip, ctrl, PWM_CTRL_REG);
-	spin_unlock(&sun4ichip->ctrl_lock);
 
 	clk_disable_unprepare(sun4ichip->clk);
 
@@ -456,8 +448,6 @@ static int sun4i_pwm_probe(struct platform_device *pdev)
 
 	chip->ops = &sun4i_pwm_ops;
 
-	spin_lock_init(&sun4ichip->ctrl_lock);
-
 	ret = pwmchip_add(chip);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
diff --git a/drivers/pwm/pwm-twl-led.c b/drivers/pwm/pwm-twl-led.c
index 4b10a8dab312..a555cc3be4b3 100644
--- a/drivers/pwm/pwm-twl-led.c
+++ b/drivers/pwm/pwm-twl-led.c
@@ -61,10 +61,6 @@
 #define TWL6040_LED_MODE_OFF	0x02
 #define TWL6040_LED_MODE_MASK	0x03
 
-struct twl_pwmled_chip {
-	struct mutex mutex;
-};
-
 static inline struct twl_pwmled_chip *to_twl(struct pwm_chip *chip)
 {
 	return pwmchip_get_drvdata(chip);
@@ -106,15 +102,13 @@ static int twl4030_pwmled_config(struct pwm_chip *chip, struct pwm_device *pwm,
 
 static int twl4030_pwmled_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 {
-	struct twl_pwmled_chip *twl = to_twl(chip);
 	int ret;
 	u8 val;
 
-	mutex_lock(&twl->mutex);
 	ret = twl_i2c_read_u8(TWL4030_MODULE_LED, &val, TWL4030_LEDEN_REG);
 	if (ret < 0) {
 		dev_err(pwmchip_parent(chip), "%s: Failed to read LEDEN\n", pwm->label);
-		goto out;
+		return ret;
 	}
 
 	val |= TWL4030_LED_TOGGLE(pwm->hwpwm, TWL4030_LED_PINS);
@@ -123,23 +117,19 @@ static int twl4030_pwmled_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 	if (ret < 0)
 		dev_err(pwmchip_parent(chip), "%s: Failed to enable PWM\n", pwm->label);
 
-out:
-	mutex_unlock(&twl->mutex);
 	return ret;
 }
 
 static void twl4030_pwmled_disable(struct pwm_chip *chip,
 				   struct pwm_device *pwm)
 {
-	struct twl_pwmled_chip *twl = to_twl(chip);
 	int ret;
 	u8 val;
 
-	mutex_lock(&twl->mutex);
 	ret = twl_i2c_read_u8(TWL4030_MODULE_LED, &val, TWL4030_LEDEN_REG);
 	if (ret < 0) {
 		dev_err(pwmchip_parent(chip), "%s: Failed to read LEDEN\n", pwm->label);
-		goto out;
+		return;
 	}
 
 	val &= ~TWL4030_LED_TOGGLE(pwm->hwpwm, TWL4030_LED_PINS);
@@ -147,9 +137,6 @@ static void twl4030_pwmled_disable(struct pwm_chip *chip,
 	ret = twl_i2c_write_u8(TWL4030_MODULE_LED, val, TWL4030_LEDEN_REG);
 	if (ret < 0)
 		dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);
-
-out:
-	mutex_unlock(&twl->mutex);
 }
 
 static int twl4030_pwmled_apply(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -209,16 +196,14 @@ static int twl6030_pwmled_config(struct pwm_chip *chip, struct pwm_device *pwm,
 
 static int twl6030_pwmled_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 {
-	struct twl_pwmled_chip *twl = to_twl(chip);
 	int ret;
 	u8 val;
 
-	mutex_lock(&twl->mutex);
 	ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2);
 	if (ret < 0) {
 		dev_err(pwmchip_parent(chip), "%s: Failed to read PWM_CTRL2\n",
 			pwm->label);
-		goto out;
+		return ret;
 	}
 
 	val &= ~TWL6040_LED_MODE_MASK;
@@ -228,24 +213,20 @@ static int twl6030_pwmled_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 	if (ret < 0)
 		dev_err(pwmchip_parent(chip), "%s: Failed to enable PWM\n", pwm->label);
 
-out:
-	mutex_unlock(&twl->mutex);
 	return ret;
 }
 
 static void twl6030_pwmled_disable(struct pwm_chip *chip,
 				   struct pwm_device *pwm)
 {
-	struct twl_pwmled_chip *twl = to_twl(chip);
 	int ret;
 	u8 val;
 
-	mutex_lock(&twl->mutex);
 	ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2);
 	if (ret < 0) {
 		dev_err(pwmchip_parent(chip), "%s: Failed to read PWM_CTRL2\n",
 			pwm->label);
-		goto out;
+		return;
 	}
 
 	val &= ~TWL6040_LED_MODE_MASK;
@@ -254,9 +235,6 @@ static void twl6030_pwmled_disable(struct pwm_chip *chip,
 	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2);
 	if (ret < 0)
 		dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);
-
-out:
-	mutex_unlock(&twl->mutex);
 }
 
 static int twl6030_pwmled_apply(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -287,16 +265,14 @@ static int twl6030_pwmled_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 static int twl6030_pwmled_request(struct pwm_chip *chip, struct pwm_device *pwm)
 {
-	struct twl_pwmled_chip *twl = to_twl(chip);
 	int ret;
 	u8 val;
 
-	mutex_lock(&twl->mutex);
 	ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2);
 	if (ret < 0) {
 		dev_err(pwmchip_parent(chip), "%s: Failed to read PWM_CTRL2\n",
 			pwm->label);
-		goto out;
+		return ret;
 	}
 
 	val &= ~TWL6040_LED_MODE_MASK;
@@ -306,23 +282,19 @@ static int twl6030_pwmled_request(struct pwm_chip *chip, struct pwm_device *pwm)
 	if (ret < 0)
 		dev_err(pwmchip_parent(chip), "%s: Failed to request PWM\n", pwm->label);
 
-out:
-	mutex_unlock(&twl->mutex);
 	return ret;
 }
 
 static void twl6030_pwmled_free(struct pwm_chip *chip, struct pwm_device *pwm)
 {
-	struct twl_pwmled_chip *twl = to_twl(chip);
 	int ret;
 	u8 val;
 
-	mutex_lock(&twl->mutex);
 	ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2);
 	if (ret < 0) {
 		dev_err(pwmchip_parent(chip), "%s: Failed to read PWM_CTRL2\n",
 			pwm->label);
-		goto out;
+		return;
 	}
 
 	val &= ~TWL6040_LED_MODE_MASK;
@@ -331,9 +303,6 @@ static void twl6030_pwmled_free(struct pwm_chip *chip, struct pwm_device *pwm)
 	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2);
 	if (ret < 0)
 		dev_err(pwmchip_parent(chip), "%s: Failed to free PWM\n", pwm->label);
-
-out:
-	mutex_unlock(&twl->mutex);
 }
 
 static const struct pwm_ops twl6030_pwmled_ops = {
@@ -345,7 +314,6 @@ static const struct pwm_ops twl6030_pwmled_ops = {
 static int twl_pwmled_probe(struct platform_device *pdev)
 {
 	struct pwm_chip *chip;
-	struct twl_pwmled_chip *twl;
 	unsigned int npwm;
 	const struct pwm_ops *ops;
 
@@ -357,15 +325,12 @@ static int twl_pwmled_probe(struct platform_device *pdev)
 		npwm = 1;
 	}
 
-	chip = devm_pwmchip_alloc(&pdev->dev, npwm, sizeof(*twl));
+	chip = devm_pwmchip_alloc(&pdev->dev, npwm, 0);
 	if (IS_ERR(chip))
 		return PTR_ERR(chip);
-	twl = to_twl(chip);
 
 	chip->ops = ops;
 
-	mutex_init(&twl->mutex);
-
 	return devm_pwmchip_add(&pdev->dev, chip);
 }
 
diff --git a/include/linux/mc33xs2410.h b/include/linux/mc33xs2410.h
new file mode 100644
index 000000000000..31c0edf10dd7
--- /dev/null
+++ b/include/linux/mc33xs2410.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2024 Liebherr-Electronics and Drives GmbH
+ */
+#ifndef _MC33XS2410_H
+#define _MC33XS2410_H
+
+#include <linux/spi/spi.h>
+
+MODULE_IMPORT_NS("PWM_MC33XS2410");
+
+int mc33xs2410_read_reg_ctrl(struct spi_device *spi, u8 reg, u16 *val);
+int mc33xs2410_read_reg_diag(struct spi_device *spi, u8 reg, u16 *val);
+int mc33xs2410_modify_reg(struct spi_device *spi, u8 reg, u8 mask, u8 val);
+
+#endif /* _MC33XS2410_H */
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 63a17d2b4ec8..8cafc483db53 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -2,6 +2,7 @@
 #ifndef __LINUX_PWM_H
 #define __LINUX_PWM_H
 
+#include <linux/cdev.h>
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/module.h>
@@ -273,6 +274,8 @@ struct pwm_capture {
 	unsigned int duty_cycle;
 };
 
+#define PWM_WFHWSIZE 20
+
 /**
  * struct pwm_ops - PWM controller operations
  * @request: optional hook for requesting a PWM
@@ -311,6 +314,7 @@ struct pwm_ops {
 /**
  * struct pwm_chip - abstract a PWM controller
  * @dev: device providing the PWMs
+ * @cdev: &struct cdev for this device
  * @ops: callbacks for this PWM controller
  * @owner: module providing this chip
  * @id: unique number of this PWM chip
@@ -325,6 +329,7 @@ struct pwm_ops {
  */
 struct pwm_chip {
 	struct device dev;
+	struct cdev cdev;
 	const struct pwm_ops *ops;
 	struct module *owner;
 	unsigned int id;
diff --git a/include/uapi/linux/pwm.h b/include/uapi/linux/pwm.h
new file mode 100644
index 000000000000..182d59cc07ee
--- /dev/null
+++ b/include/uapi/linux/pwm.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
+
+#ifndef _UAPI_PWM_H_
+#define _UAPI_PWM_H_
+
+#include <linux/ioctl.h>
+#include <linux/types.h>
+
+/**
+ * struct pwmchip_waveform - Describe a PWM waveform for a pwm_chip's PWM channel
+ * @hwpwm: per-chip relative index of the PWM device
+ * @__pad: padding, must be zero
+ * @period_length_ns: duration of the repeating period.
+ *    A value of 0 represents a disabled PWM.
+ * @duty_length_ns: duration of the active part in each period
+ * @duty_offset_ns: offset of the rising edge from a period's start
+ */
+struct pwmchip_waveform {
+	__u32 hwpwm;
+	__u32 __pad;
+	__u64 period_length_ns;
+	__u64 duty_length_ns;
+	__u64 duty_offset_ns;
+};
+
+/* Reserves the passed hwpwm for exclusive control. */
+#define PWM_IOCTL_REQUEST	_IO(0x75, 1)
+
+/* counter part to PWM_IOCTL_REQUEST */
+#define PWM_IOCTL_FREE		_IO(0x75, 2)
+
+/*
+ * Modifies the passed wf according to hardware constraints. All parameters are
+ * rounded down to the next possible value, unless there is no such value, then
+ * values are rounded up. Note that zero isn't considered for rounding down
+ * period_length_ns.
+ */
+#define PWM_IOCTL_ROUNDWF	_IOWR(0x75, 3, struct pwmchip_waveform)
+
+/* Get the currently implemented waveform */
+#define PWM_IOCTL_GETWF		_IOWR(0x75, 4, struct pwmchip_waveform)
+
+/* Like PWM_IOCTL_ROUNDWF + PWM_IOCTL_SETEXACTWF in one go. */
+#define PWM_IOCTL_SETROUNDEDWF	_IOW(0x75, 5, struct pwmchip_waveform)
+
+/*
+ * Program the PWM to emit exactly the passed waveform, subject only to rounding
+ * down each value less than 1 ns. Returns 0 on success, -EDOM if the waveform
+ * cannot be implemented exactly, or other negative error codes.
+ */
+#define PWM_IOCTL_SETEXACTWF	_IOW(0x75, 6, struct pwmchip_waveform)
+
+#endif /* _UAPI_PWM_H_ */