Merge tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc

Pull ARM SoC driver updates from Olof Johansson:
 "Various driver updates for platforms:

   - A larger set of work on Tegra 2/3 around memory controller and
     regulator features, some fuse cleanups, etc..

   - MMP platform drivers, in particular for USB PHY, and other smaller
     additions.

   - Samsung Exynos 5422 driver for DMC (dynamic memory configuration),
     and ASV (adaptive voltage), allowing the platform to run at more
     optimal operating points.

   - Misc refactorings and support for RZ/G2N and R8A774B1 from Renesas

   - Clock/reset control driver for TI/OMAP

   - Meson-A1 reset controller support

   - Qualcomm sdm845 and sda845 SoC IDs for socinfo"

* tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (150 commits)
  firmware: arm_scmi: Fix doorbell ring logic for !CONFIG_64BIT
  soc: fsl: add RCPM driver
  dt-bindings: fsl: rcpm: Add 'little-endian' and update Chassis definition
  memory: tegra: Consolidate registers definition into common header
  memory: tegra: Ensure timing control debug features are disabled
  memory: tegra: Introduce Tegra30 EMC driver
  memory: tegra: Do not handle error from wait_for_completion_timeout()
  memory: tegra: Increase handshake timeout on Tegra20
  memory: tegra: Print a brief info message about EMC timings
  memory: tegra: Pre-configure debug register on Tegra20
  memory: tegra: Include io.h instead of iopoll.h
  memory: tegra: Adapt for Tegra20 clock driver changes
  memory: tegra: Don't set EMC rate to maximum on probe for Tegra20
  memory: tegra: Add gr2d and gr3d to DRM IOMMU group
  memory: tegra: Set DMA mask based on supported address bits
  soc: at91: Add Atmel SFR SN (Serial Number) support
  memory: atmel-ebi: switch to SPDX license identifiers
  memory: atmel-ebi: move NUM_CS definition inside EBI driver
  soc: mediatek: Refactor bus protection control
  soc: mediatek: Refactor sram control
  ...

2 files changed, 54 insertions, 29 deletions

diff --git a/drivers/soc/imx/soc-imx-scu.c b/drivers/soc/imx/soc-imx-scu.c
index c68882eb80f7..fb70b8a3f7c5 100644
--- a/drivers/soc/imx/soc-imx-scu.c
+++ b/drivers/soc/imx/soc-imx-scu.c
@@ -33,12 +33,10 @@ struct imx_sc_msg_misc_get_soc_uid {
 	u32 uid_high;
 } __packed;
 
-static ssize_t soc_uid_show(struct device *dev,
-			    struct device_attribute *attr, char *buf)
+static int imx_scu_soc_uid(u64 *soc_uid)
 {
 	struct imx_sc_msg_misc_get_soc_uid msg;
 	struct imx_sc_rpc_msg *hdr = &msg.hdr;
-	u64 soc_uid;
 	int ret;
 
 	hdr->ver = IMX_SC_RPC_VERSION;
@@ -52,15 +50,13 @@ static ssize_t soc_uid_show(struct device *dev,
 		return ret;
 	}
 
-	soc_uid = msg.uid_high;
-	soc_uid <<= 32;
-	soc_uid |= msg.uid_low;
+	*soc_uid = msg.uid_high;
+	*soc_uid <<= 32;
+	*soc_uid |= msg.uid_low;
 
-	return sprintf(buf, "%016llX\n", soc_uid);
+	return 0;
 }
 
-static DEVICE_ATTR_RO(soc_uid);
-
 static int imx_scu_soc_id(void)
 {
 	struct imx_sc_msg_misc_get_soc_id msg;
@@ -89,6 +85,7 @@ static int imx_scu_soc_probe(struct platform_device *pdev)
 	struct soc_device_attribute *soc_dev_attr;
 	struct soc_device *soc_dev;
 	int id, ret;
+	u64 uid = 0;
 	u32 val;
 
 	ret = imx_scu_get_handle(&soc_ipc_handle);
@@ -112,6 +109,10 @@ static int imx_scu_soc_probe(struct platform_device *pdev)
 	if (id < 0)
 		return -EINVAL;
 
+	ret = imx_scu_soc_uid(&uid);
+	if (ret < 0)
+		return -EINVAL;
+
 	/* format soc_id value passed from SCU firmware */
 	val = id & 0x1f;
 	soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "0x%x", val);
@@ -130,19 +131,22 @@ static int imx_scu_soc_probe(struct platform_device *pdev)
 		goto free_soc_id;
 	}
 
+	soc_dev_attr->serial_number = kasprintf(GFP_KERNEL, "%016llX", uid);
+	if (!soc_dev_attr->serial_number) {
+		ret = -ENOMEM;
+		goto free_revision;
+	}
+
 	soc_dev = soc_device_register(soc_dev_attr);
 	if (IS_ERR(soc_dev)) {
 		ret = PTR_ERR(soc_dev);
-		goto free_revision;
+		goto free_serial_number;
 	}
 
-	ret = device_create_file(soc_device_to_device(soc_dev),
-				 &dev_attr_soc_uid);
-	if (ret)
-		goto free_revision;
-
 	return 0;
 
+free_serial_number:
+	kfree(soc_dev_attr->serial_number);
 free_revision:
 	kfree(soc_dev_attr->revision);
 free_soc_id:
diff --git a/drivers/soc/imx/soc-imx8.c b/drivers/soc/imx/soc-imx8.c
index b9831576dd25..d84ed736cdb0 100644
--- a/drivers/soc/imx/soc-imx8.c
+++ b/drivers/soc/imx/soc-imx8.c
@@ -9,6 +9,7 @@
 #include <linux/slab.h>
 #include <linux/sys_soc.h>
 #include <linux/platform_device.h>
+#include <linux/arm-smccc.h>
 #include <linux/of.h>
 
 #define REV_B1				0x21
@@ -16,6 +17,8 @@
 #define IMX8MQ_SW_INFO_B1		0x40
 #define IMX8MQ_SW_MAGIC_B1		0xff0055aa
 
+#define IMX_SIP_GET_SOC_INFO		0xc2000006
+
 #define OCOTP_UID_LOW			0x410
 #define OCOTP_UID_HIGH			0x420
 
@@ -29,13 +32,21 @@ struct imx8_soc_data {
 
 static u64 soc_uid;
 
-static ssize_t soc_uid_show(struct device *dev,
-			    struct device_attribute *attr, char *buf)
+#ifdef CONFIG_HAVE_ARM_SMCCC
+static u32 imx8mq_soc_revision_from_atf(void)
 {
-	return sprintf(buf, "%016llX\n", soc_uid);
-}
+	struct arm_smccc_res res;
 
-static DEVICE_ATTR_RO(soc_uid);
+	arm_smccc_smc(IMX_SIP_GET_SOC_INFO, 0, 0, 0, 0, 0, 0, 0, &res);
+
+	if (res.a0 == SMCCC_RET_NOT_SUPPORTED)
+		return 0;
+	else
+		return res.a0 & 0xff;
+}
+#else
+static inline u32 imx8mq_soc_revision_from_atf(void) { return 0; };
+#endif
 
 static u32 __init imx8mq_soc_revision(void)
 {
@@ -51,9 +62,16 @@ static u32 __init imx8mq_soc_revision(void)
 	ocotp_base = of_iomap(np, 0);
 	WARN_ON(!ocotp_base);
 
-	magic = readl_relaxed(ocotp_base + IMX8MQ_SW_INFO_B1);
-	if (magic == IMX8MQ_SW_MAGIC_B1)
-		rev = REV_B1;
+	/*
+	 * SOC revision on older imx8mq is not available in fuses so query
+	 * the value from ATF instead.
+	 */
+	rev = imx8mq_soc_revision_from_atf();
+	if (!rev) {
+		magic = readl_relaxed(ocotp_base + IMX8MQ_SW_INFO_B1);
+		if (magic == IMX8MQ_SW_MAGIC_B1)
+			rev = REV_B1;
+	}
 
 	soc_uid = readl_relaxed(ocotp_base + OCOTP_UID_HIGH);
 	soc_uid <<= 32;
@@ -174,22 +192,25 @@ static int __init imx8_soc_init(void)
 		goto free_soc;
 	}
 
+	soc_dev_attr->serial_number = kasprintf(GFP_KERNEL, "%016llX", soc_uid);
+	if (!soc_dev_attr->serial_number) {
+		ret = -ENOMEM;
+		goto free_rev;
+	}
+
 	soc_dev = soc_device_register(soc_dev_attr);
 	if (IS_ERR(soc_dev)) {
 		ret = PTR_ERR(soc_dev);
-		goto free_rev;
+		goto free_serial_number;
 	}
 
-	ret = device_create_file(soc_device_to_device(soc_dev),
-				 &dev_attr_soc_uid);
-	if (ret)
-		goto free_rev;
-
 	if (IS_ENABLED(CONFIG_ARM_IMX_CPUFREQ_DT))
 		platform_device_register_simple("imx-cpufreq-dt", -1, NULL, 0);
 
 	return 0;
 
+free_serial_number:
+	kfree(soc_dev_attr->serial_number);
 free_rev:
 	if (strcmp(soc_dev_attr->revision, "unknown"))
 		kfree(soc_dev_attr->revision);