summaryrefslogtreecommitdiff
path: root/drivers/i2c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2017-05-03 12:18:47 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-03 12:18:47 -0700
commit14b730723aac9cf3ba0a74e830491e9a43bfc80a (patch)
tree2d1591012ce62103a8c9fa0ebc4d002408f4d47f /drivers/i2c
parentd26f552ebbfb0f2c7fe712f457a038d60ed73daa (diff)
parent889ef45cd4b64cc4fd6dbebecddb8ea4df8cc1e7 (diff)
Merge branch 'i2c/for-4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c updates from Wilfram Sang: "I2C has the following updates for you: - an immutable cross-subsystem branch fixing PMIC access on Intel Baytrail - bigger driver updates to the designware, meson, exynos5 drivers - new i2c_acpi_new_device() function to create devices from ACPI - struct i2c_driver has now a flag 'disable_i2c_core_irq_mapping' to allow custom IRQ mapping in case the default does not fit - mux subsystem centralized error messages in its core - new driver for ltc4306 i2c mux - usual set of small updates" * 'i2c/for-4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (44 commits) i2c: thunderx: Enable HWMON class probing i2c: rcar: clarify PM handling with more comments i2c: rcar: fix resume by always initializing registers before transfer i2c: tegra: fix spelling mistake: "contoller" -> "controller" i2c: exynos5: use core helper to get driver data i2c: exynos5: de-duplicate error logs on clock setup i2c: exynos5: simplify clock frequency handling i2c: exynos5: simplify timings calculation i2c: designware-baytrail: fix potential null pointer dereference on dev i2c: designware: Get selected speed mode sda-hold-time via ACPI [media] cx231xx: stop double error reporting i2c: core: Allow drivers to disable i2c-core irq mapping i2c: core: Add new i2c_acpi_new_device helper function i2c: core: Allow getting ACPI info by index i2c: img-scb: use setup_timer i2c: i2c-scmi: add a MS HID i2c: mux: ltc4306: LTC4306 and LTC4305 I2C multiplexer/switch dt-bindings: i2c: mux: ltc4306: Add dt-bindings for I2C multiplexer/switch i2c: mux: reg: stop double error reporting i2c: mux: pinctrl: stop double error reporting ...
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/Kconfig3
-rw-r--r--drivers/i2c/busses/i2c-designware-baytrail.c8
-rw-r--r--drivers/i2c/busses/i2c-designware-core.c11
-rw-r--r--drivers/i2c/busses/i2c-designware-core.h4
-rw-r--r--drivers/i2c/busses/i2c-designware-platdrv.c56
-rw-r--r--drivers/i2c/busses/i2c-exynos5.c116
-rw-r--r--drivers/i2c/busses/i2c-img-scb.c5
-rw-r--r--drivers/i2c/busses/i2c-meson.c134
-rw-r--r--drivers/i2c/busses/i2c-mv64xxx.c15
-rw-r--r--drivers/i2c/busses/i2c-rcar.c8
-rw-r--r--drivers/i2c/busses/i2c-scmi.c4
-rw-r--r--drivers/i2c/busses/i2c-tegra-bpmp.c2
-rw-r--r--drivers/i2c/busses/i2c-thunderx-pcidrv.c25
-rw-r--r--drivers/i2c/busses/i2c-xlp9xx.c1
-rw-r--r--drivers/i2c/i2c-core.c62
-rw-r--r--drivers/i2c/i2c-mux.c9
-rw-r--r--drivers/i2c/muxes/Kconfig11
-rw-r--r--drivers/i2c/muxes/Makefile1
-rw-r--r--drivers/i2c/muxes/i2c-arb-gpio-challenge.c4
-rw-r--r--drivers/i2c/muxes/i2c-mux-gpio.c4
-rw-r--r--drivers/i2c/muxes/i2c-mux-ltc4306.c322
-rw-r--r--drivers/i2c/muxes/i2c-mux-pca9541.c4
-rw-r--r--drivers/i2c/muxes/i2c-mux-pca954x.c19
-rw-r--r--drivers/i2c/muxes/i2c-mux-pinctrl.c4
-rw-r--r--drivers/i2c/muxes/i2c-mux-reg.c4
25 files changed, 588 insertions, 248 deletions
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 8adc0f1d7ad0..144cbadc7c72 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -933,6 +933,7 @@ config I2C_TEGRA
config I2C_TEGRA_BPMP
tristate "NVIDIA Tegra BPMP I2C controller"
depends on TEGRA_BPMP
+ default y
help
If you say yes to this option, support will be included for the I2C
controller embedded in NVIDIA Tegra SoCs accessed via the BPMP.
@@ -1021,7 +1022,7 @@ config I2C_XLR
config I2C_XLP9XX
tristate "XLP9XX I2C support"
- depends on CPU_XLP || ARCH_VULCAN || COMPILE_TEST
+ depends on CPU_XLP || ARCH_THUNDER2 || COMPILE_TEST
help
This driver enables support for the on-chip I2C interface of
the Broadcom XLP9xx/XLP5xx MIPS and Vulcan ARM64 processors.
diff --git a/drivers/i2c/busses/i2c-designware-baytrail.c b/drivers/i2c/busses/i2c-designware-baytrail.c
index 1749a0f5a9fa..dbda8c9c8a1c 100644
--- a/drivers/i2c/busses/i2c-designware-baytrail.c
+++ b/drivers/i2c/busses/i2c-designware-baytrail.c
@@ -22,7 +22,7 @@
#include "i2c-designware-core.h"
-#define SEMAPHORE_TIMEOUT 100
+#define SEMAPHORE_TIMEOUT 500
#define PUNIT_SEMAPHORE 0x7
#define PUNIT_SEMAPHORE_CHT 0x10e
#define PUNIT_SEMAPHORE_BIT BIT(0)
@@ -70,7 +70,7 @@ static void reset_semaphore(struct dw_i2c_dev *dev)
static int baytrail_i2c_acquire(struct dw_i2c_dev *dev)
{
- u32 addr = get_sem_addr(dev);
+ u32 addr;
u32 sem = PUNIT_SEMAPHORE_ACQUIRE;
int ret;
unsigned long start, end;
@@ -94,6 +94,8 @@ static int baytrail_i2c_acquire(struct dw_i2c_dev *dev)
*/
pm_qos_update_request(&dev->pm_qos, 0);
+ addr = get_sem_addr(dev);
+
/* host driver writes to side band semaphore register */
ret = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE, addr, sem);
if (ret) {
@@ -170,7 +172,7 @@ int i2c_dw_probe_lock_support(struct dw_i2c_dev *dev)
dev_info(dev->dev, "I2C bus managed by PUNIT\n");
dev->acquire_lock = baytrail_i2c_acquire;
dev->release_lock = baytrail_i2c_release;
- dev->pm_runtime_disabled = true;
+ dev->pm_disabled = true;
pm_qos_add_request(&dev->pm_qos, PM_QOS_CPU_DMA_LATENCY,
PM_QOS_DEFAULT_VALUE);
diff --git a/drivers/i2c/busses/i2c-designware-core.c b/drivers/i2c/busses/i2c-designware-core.c
index 15a534818d4f..c453717b753b 100644
--- a/drivers/i2c/busses/i2c-designware-core.c
+++ b/drivers/i2c/busses/i2c-designware-core.c
@@ -960,6 +960,7 @@ EXPORT_SYMBOL_GPL(i2c_dw_read_comp_param);
int i2c_dw_probe(struct dw_i2c_dev *dev)
{
struct i2c_adapter *adap = &dev->adapter;
+ unsigned long irq_flags;
int r;
init_completion(&dev->cmd_complete);
@@ -975,9 +976,15 @@ int i2c_dw_probe(struct dw_i2c_dev *dev)
adap->dev.parent = dev->dev;
i2c_set_adapdata(adap, dev);
+ if (dev->pm_disabled) {
+ dev_pm_syscore_device(dev->dev, true);
+ irq_flags = IRQF_NO_SUSPEND;
+ } else {
+ irq_flags = IRQF_SHARED | IRQF_COND_SUSPEND;
+ }
+
i2c_dw_disable_int(dev);
- r = devm_request_irq(dev->dev, dev->irq, i2c_dw_isr,
- IRQF_SHARED | IRQF_COND_SUSPEND,
+ r = devm_request_irq(dev->dev, dev->irq, i2c_dw_isr, irq_flags,
dev_name(dev->dev), dev);
if (r) {
dev_err(dev->dev, "failure requesting irq %i: %d\n",
diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h
index 846ea57f85af..a7cf429daf60 100644
--- a/drivers/i2c/busses/i2c-designware-core.h
+++ b/drivers/i2c/busses/i2c-designware-core.h
@@ -79,7 +79,7 @@
* @pm_qos: pm_qos_request used while holding a hardware lock on the bus
* @acquire_lock: function to acquire a hardware lock on the bus
* @release_lock: function to release a hardware lock on the bus
- * @pm_runtime_disabled: true if pm runtime is disabled
+ * @pm_disabled: true if power-management should be disabled for this i2c-bus
*
* HCNT and LCNT parameters can be used if the platform knows more accurate
* values than the one computed based only on the input clock frequency.
@@ -128,7 +128,7 @@ struct dw_i2c_dev {
struct pm_qos_request pm_qos;
int (*acquire_lock)(struct dw_i2c_dev *dev);
void (*release_lock)(struct dw_i2c_dev *dev);
- bool pm_runtime_disabled;
+ bool pm_disabled;
};
#define ACCESS_SWAP 0x00000001
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index d8665098dce9..5a4eb6b6bd92 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -85,8 +85,7 @@ static void dw_i2c_acpi_params(struct platform_device *pdev, char method[],
*hcnt = (u16)objs[0].integer.value;
*lcnt = (u16)objs[1].integer.value;
- if (sda_hold)
- *sda_hold = (u32)objs[2].integer.value;
+ *sda_hold = (u32)objs[2].integer.value;
}
kfree(buf.pointer);
@@ -95,26 +94,55 @@ static void dw_i2c_acpi_params(struct platform_device *pdev, char method[],
static int dw_i2c_acpi_configure(struct platform_device *pdev)
{
struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
+ acpi_handle handle = ACPI_HANDLE(&pdev->dev);
const struct acpi_device_id *id;
+ struct acpi_device *adev;
+ const char *uid;
dev->adapter.nr = -1;
dev->tx_fifo_depth = 32;
dev->rx_fifo_depth = 32;
/*
- * Try to get SDA hold time and *CNT values from an ACPI method if
- * it exists for both supported speed modes.
+ * Try to get SDA hold time and *CNT values from an ACPI method for
+ * selected speed modes.
*/
- dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, NULL);
- dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt,
- &dev->sda_hold_time);
- dw_i2c_acpi_params(pdev, "FPCN", &dev->fp_hcnt, &dev->fp_lcnt, NULL);
- dw_i2c_acpi_params(pdev, "HSCN", &dev->hs_hcnt, &dev->hs_lcnt, NULL);
+ switch (dev->clk_freq) {
+ case 100000:
+ dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt,
+ &dev->sda_hold_time);
+ break;
+ case 1000000:
+ dw_i2c_acpi_params(pdev, "FPCN", &dev->fp_hcnt, &dev->fp_lcnt,
+ &dev->sda_hold_time);
+ break;
+ case 3400000:
+ dw_i2c_acpi_params(pdev, "HSCN", &dev->hs_hcnt, &dev->hs_lcnt,
+ &dev->sda_hold_time);
+ break;
+ case 400000:
+ default:
+ dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt,
+ &dev->sda_hold_time);
+ break;
+ }
id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
if (id && id->driver_data)
dev->flags |= (u32)id->driver_data;
+ if (acpi_bus_get_device(handle, &adev))
+ return -ENODEV;
+
+ /*
+ * Cherrytrail I2C7 gets used for the PMIC which gets accessed
+ * through ACPI opregions during late suspend / early resume
+ * disable pm for it.
+ */
+ uid = adev->pnp.unique_id;
+ if ((dev->flags & MODEL_CHERRYTRAIL) && !strcmp(uid, "7"))
+ dev->pm_disabled = true;
+
return 0;
}
@@ -286,7 +314,7 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
adap->dev.of_node = pdev->dev.of_node;
- if (dev->pm_runtime_disabled) {
+ if (dev->pm_disabled) {
pm_runtime_forbid(&pdev->dev);
} else {
pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
@@ -302,7 +330,7 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
return r;
exit_probe:
- if (!dev->pm_runtime_disabled)
+ if (!dev->pm_disabled)
pm_runtime_disable(&pdev->dev);
exit_reset:
if (!IS_ERR_OR_NULL(dev->rst))
@@ -322,7 +350,7 @@ static int dw_i2c_plat_remove(struct platform_device *pdev)
pm_runtime_dont_use_autosuspend(&pdev->dev);
pm_runtime_put_sync(&pdev->dev);
- if (!dev->pm_runtime_disabled)
+ if (!dev->pm_disabled)
pm_runtime_disable(&pdev->dev);
if (!IS_ERR_OR_NULL(dev->rst))
reset_control_assert(dev->rst);
@@ -374,9 +402,7 @@ static int dw_i2c_plat_resume(struct device *dev)
struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
i2c_dw_plat_prepare_clk(i_dev, true);
-
- if (!i_dev->pm_runtime_disabled)
- i2c_dw_init(i_dev);
+ i2c_dw_init(i_dev);
return 0;
}
diff --git a/drivers/i2c/busses/i2c-exynos5.c b/drivers/i2c/busses/i2c-exynos5.c
index 736a82472101..23ed4d67ecad 100644
--- a/drivers/i2c/busses/i2c-exynos5.c
+++ b/drivers/i2c/busses/i2c-exynos5.c
@@ -22,6 +22,7 @@
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/of_address.h>
+#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/spinlock.h>
@@ -168,8 +169,6 @@
*/
#define HSI2C_HS_TX_CLOCK 1000000
#define HSI2C_FS_TX_CLOCK 100000
-#define HSI2C_HIGH_SPD 1
-#define HSI2C_FAST_SPD 0
#define EXYNOS5_I2C_TIMEOUT (msecs_to_jiffies(1000))
@@ -200,18 +199,10 @@ struct exynos5_i2c {
int trans_done;
/* Controller operating frequency */
- unsigned int fs_clock;
- unsigned int hs_clock;
-
- /*
- * HSI2C Controller can operate in
- * 1. High speed upto 3.4Mbps
- * 2. Fast speed upto 1Mbps
- */
- int speed_mode;
+ unsigned int op_clock;
/* Version of HS-I2C Hardware */
- struct exynos_hsi2c_variant *variant;
+ const struct exynos_hsi2c_variant *variant;
};
/**
@@ -257,15 +248,6 @@ static const struct of_device_id exynos5_i2c_match[] = {
};
MODULE_DEVICE_TABLE(of, exynos5_i2c_match);
-static inline struct exynos_hsi2c_variant *exynos5_i2c_get_variant
- (struct platform_device *pdev)
-{
- const struct of_device_id *match;
-
- match = of_match_node(exynos5_i2c_match, pdev->dev.of_node);
- return (struct exynos_hsi2c_variant *)match->data;
-}
-
static void exynos5_i2c_clr_pend_irq(struct exynos5_i2c *i2c)
{
writel(readl(i2c->regs + HSI2C_INT_STATUS),
@@ -279,7 +261,7 @@ static void exynos5_i2c_clr_pend_irq(struct exynos5_i2c *i2c)
* Returns 0 on success, -EINVAL if the cycle length cannot
* be calculated.
*/
-static int exynos5_i2c_set_timing(struct exynos5_i2c *i2c, int mode)
+static int exynos5_i2c_set_timing(struct exynos5_i2c *i2c, bool hs_timings)
{
u32 i2c_timing_s1;
u32 i2c_timing_s2;
@@ -292,9 +274,10 @@ static int exynos5_i2c_set_timing(struct exynos5_i2c *i2c, int mode)
unsigned int t_sr_release;
unsigned int t_ftl_cycle;
unsigned int clkin = clk_get_rate(i2c->clk);
- unsigned int div, utemp0 = 0, utemp1 = 0, clk_cycle;
- unsigned int op_clk = (mode == HSI2C_HIGH_SPD) ?
- i2c->hs_clock : i2c->fs_clock;
+ unsigned int op_clk = hs_timings ? i2c->op_clock :
+ (i2c->op_clock >= HSI2C_HS_TX_CLOCK) ? HSI2C_FS_TX_CLOCK :
+ i2c->op_clock;
+ int div, clk_cycle, temp;
/*
* In case of HSI2C controller in Exynos5 series
@@ -305,33 +288,22 @@ static int exynos5_i2c_set_timing(struct exynos5_i2c *i2c, int mode)
* FPCLK / FI2C =
* (CLK_DIV + 1) * (TSCLK_L + TSCLK_H + 2) + 8 + FLT_CYCLE
*
- * utemp0 = (CLK_DIV + 1) * (TSCLK_L + TSCLK_H + 2)
- * utemp1 = (TSCLK_L + TSCLK_H + 2)
+ * clk_cycle := TSCLK_L + TSCLK_H
+ * temp := (CLK_DIV + 1) * (clk_cycle + 2)
+ *
+ * Constraints: 4 <= temp, 0 <= CLK_DIV < 256, 2 <= clk_cycle <= 510
+ *
*/
t_ftl_cycle = (readl(i2c->regs + HSI2C_CONF) >> 16) & 0x7;
- utemp0 = (clkin / op_clk) - 8;
-
- if (i2c->variant->hw == HSI2C_EXYNOS7)
- utemp0 -= t_ftl_cycle;
- else
- utemp0 -= 2 * t_ftl_cycle;
-
- /* CLK_DIV max is 256 */
- for (div = 0; div < 256; div++) {
- utemp1 = utemp0 / (div + 1);
-
- /*
- * SCL_L and SCL_H each has max value of 255
- * Hence, For the clk_cycle to the have right value
- * utemp1 has to be less then 512 and more than 4.
- */
- if ((utemp1 < 512) && (utemp1 > 4)) {
- clk_cycle = utemp1 - 2;
- break;
- } else if (div == 255) {
- dev_warn(i2c->dev, "Failed to calculate divisor");
- return -EINVAL;
- }
+ temp = clkin / op_clk - 8 - t_ftl_cycle;
+ if (i2c->variant->hw != HSI2C_EXYNOS7)
+ temp -= t_ftl_cycle;
+ div = temp / 512;
+ clk_cycle = temp / (div + 1) - 2;
+ if (temp < 4 || div >= 256 || clk_cycle < 2) {
+ dev_err(i2c->dev, "%s clock set-up failed\n",
+ hs_timings ? "HS" : "FS");
+ return -EINVAL;
}
t_scl_l = clk_cycle / 2;
@@ -356,7 +328,7 @@ static int exynos5_i2c_set_timing(struct exynos5_i2c *i2c, int mode)
div, t_sr_release);
dev_dbg(i2c->dev, "tDATA_HD: %X\n", t_data_hd);
- if (mode == HSI2C_HIGH_SPD) {
+ if (hs_timings) {
writel(i2c_timing_s1, i2c->regs + HSI2C_TIMING_HS1);
writel(i2c_timing_s2, i2c->regs + HSI2C_TIMING_HS2);
writel(i2c_timing_s3, i2c->regs + HSI2C_TIMING_HS3);
@@ -372,24 +344,13 @@ static int exynos5_i2c_set_timing(struct exynos5_i2c *i2c, int mode)
static int exynos5_hsi2c_clock_setup(struct exynos5_i2c *i2c)
{
- /*
- * Configure the Fast speed timing values
- * Even the High Speed mode initially starts with Fast mode
- */
- if (exynos5_i2c_set_timing(i2c, HSI2C_FAST_SPD)) {
- dev_err(i2c->dev, "HSI2C FS Clock set up failed\n");
- return -EINVAL;
- }
+ /* always set Fast Speed timings */
+ int ret = exynos5_i2c_set_timing(i2c, false);
- /* configure the High speed timing values */
- if (i2c->speed_mode == HSI2C_HIGH_SPD) {
- if (exynos5_i2c_set_timing(i2c, HSI2C_HIGH_SPD)) {
- dev_err(i2c->dev, "HSI2C HS Clock set up failed\n");
- return -EINVAL;
- }
- }
+ if (ret < 0 || i2c->op_clock < HSI2C_HS_TX_CLOCK)
+ return ret;
- return 0;
+ return exynos5_i2c_set_timing(i2c, true);
}
/*
@@ -409,7 +370,7 @@ static void exynos5_i2c_init(struct exynos5_i2c *i2c)
i2c->regs + HSI2C_CTL);
writel(HSI2C_TRAILING_COUNT, i2c->regs + HSI2C_TRAILIG_CTL);
- if (i2c->speed_mode == HSI2C_HIGH_SPD) {
+ if (i2c->op_clock >= HSI2C_HS_TX_CLOCK) {
writel(HSI2C_MASTER_ID(MASTER_ID(i2c->adap.nr)),
i2c->regs + HSI2C_ADDR);
i2c_conf |= HSI2C_HS_MODE;
@@ -747,26 +708,14 @@ static int exynos5_i2c_probe(struct platform_device *pdev)
struct device_node *np = pdev->dev.of_node;
struct exynos5_i2c *i2c;
struct resource *mem;
- unsigned int op_clock;
int ret;
i2c = devm_kzalloc(&pdev->dev, sizeof(struct exynos5_i2c), GFP_KERNEL);
if (!i2c)
return -ENOMEM;
- if (of_property_read_u32(np, "clock-frequency", &op_clock)) {
- i2c->speed_mode = HSI2C_FAST_SPD;
- i2c->fs_clock = HSI2C_FS_TX_CLOCK;
- } else {
- if (op_clock >= HSI2C_HS_TX_CLOCK) {
- i2c->speed_mode = HSI2C_HIGH_SPD;
- i2c->fs_clock = HSI2C_FS_TX_CLOCK;
- i2c->hs_clock = op_clock;
- } else {
- i2c->speed_mode = HSI2C_FAST_SPD;
- i2c->fs_clock = op_clock;
- }
- }
+ if (of_property_read_u32(np, "clock-frequency", &i2c->op_clock))
+ i2c->op_clock = HSI2C_FS_TX_CLOCK;
strlcpy(i2c->adap.name, "exynos5-i2c", sizeof(i2c->adap.name));
i2c->adap.owner = THIS_MODULE;
@@ -817,8 +766,7 @@ static int exynos5_i2c_probe(struct platform_device *pdev)
goto err_clk;
}
- /* Need to check the variant before setting up. */
- i2c->variant = exynos5_i2c_get_variant(pdev);
+ i2c->variant = of_device_get_match_data(&pdev->dev);
ret = exynos5_hsi2c_clock_setup(i2c);
if (ret)
diff --git a/drivers/i2c/busses/i2c-img-scb.c b/drivers/i2c/busses/i2c-img-scb.c
index db8e8b40569d..84fb35f6837f 100644
--- a/drivers/i2c/busses/i2c-img-scb.c
+++ b/drivers/i2c/busses/i2c-img-scb.c
@@ -1362,9 +1362,8 @@ static int img_i2c_probe(struct platform_device *pdev)
}
/* Set up the exception check timer */
- init_timer(&i2c->check_timer);
- i2c->check_timer.function = img_i2c_check_timer;
- i2c->check_timer.data = (unsigned long)i2c;
+ setup_timer(&i2c->check_timer, img_i2c_check_timer,
+ (unsigned long)i2c);
i2c->bitrate = timings[0].max_bitrate;
if (!of_property_read_u32(node, "clock-frequency", &val))
diff --git a/drivers/i2c/busses/i2c-meson.c b/drivers/i2c/busses/i2c-meson.c
index 73b97c71a484..88d15b92ec35 100644
--- a/drivers/i2c/busses/i2c-meson.c
+++ b/drivers/i2c/busses/i2c-meson.c
@@ -35,10 +35,11 @@
#define REG_CTRL_STATUS BIT(2)
#define REG_CTRL_ERROR BIT(3)
#define REG_CTRL_CLKDIV_SHIFT 12
-#define REG_CTRL_CLKDIV_MASK ((BIT(10) - 1) << REG_CTRL_CLKDIV_SHIFT)
+#define REG_CTRL_CLKDIV_MASK GENMASK(21, 12)
+#define REG_CTRL_CLKDIVEXT_SHIFT 28
+#define REG_CTRL_CLKDIVEXT_MASK GENMASK(29, 28)
#define I2C_TIMEOUT_MS 500
-#define DEFAULT_FREQ 100000
enum {
TOKEN_END = 0,
@@ -54,7 +55,6 @@ enum {
STATE_IDLE,
STATE_READ,
STATE_WRITE,
- STATE_STOP,
};
/**
@@ -73,7 +73,6 @@ enum {
* @error: Flag set when an error is received
* @lock: To avoid race conditions between irq handler and xfer code
* @done: Completion used to wait for transfer termination
- * @frequency: Operating frequency of I2C bus clock
* @tokens: Sequence of tokens to be written to the device
* @num_tokens: Number of tokens
*/
@@ -82,7 +81,6 @@ struct meson_i2c {
struct device *dev;
void __iomem *regs;
struct clk *clk;
- int irq;
struct i2c_msg *msg;
int state;
@@ -93,7 +91,6 @@ struct meson_i2c {
spinlock_t lock;
struct completion done;
- unsigned int frequency;
u32 tokens[2];
int num_tokens;
};
@@ -126,23 +123,27 @@ static void meson_i2c_add_token(struct meson_i2c *i2c, int token)
i2c->num_tokens++;
}
-static void meson_i2c_write_tokens(struct meson_i2c *i2c)
-{
- writel(i2c->tokens[0], i2c->regs + REG_TOK_LIST0);
- writel(i2c->tokens[1], i2c->regs + REG_TOK_LIST1);
-}
-
-static void meson_i2c_set_clk_div(struct meson_i2c *i2c)
+static void meson_i2c_set_clk_div(struct meson_i2c *i2c, unsigned int freq)
{
unsigned long clk_rate = clk_get_rate(i2c->clk);
unsigned int div;
- div = DIV_ROUND_UP(clk_rate, i2c->frequency * 4);
+ div = DIV_ROUND_UP(clk_rate, freq * 4);
+
+ /* clock divider has 12 bits */
+ if (div >= (1 << 12)) {
+ dev_err(i2c->dev, "requested bus frequency too low\n");
+ div = (1 << 12) - 1;
+ }
+
meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_CLKDIV_MASK,
- div << REG_CTRL_CLKDIV_SHIFT);
+ (div & GENMASK(9, 0)) << REG_CTRL_CLKDIV_SHIFT);
+
+ meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_CLKDIVEXT_MASK,
+ (div >> 10) << REG_CTRL_CLKDIVEXT_SHIFT);
dev_dbg(i2c->dev, "%s: clk %lu, freq %u, div %u\n", __func__,
- clk_rate, i2c->frequency, div);
+ clk_rate, freq, div);
}
static void meson_i2c_get_data(struct meson_i2c *i2c, char *buf, int len)
@@ -156,10 +157,10 @@ static void meson_i2c_get_data(struct meson_i2c *i2c, char *buf, int len)
dev_dbg(i2c->dev, "%s: data %08x %08x len %d\n", __func__,
rdata0, rdata1, len);
- for (i = 0; i < min_t(int, 4, len); i++)
+ for (i = 0; i < min(4, len); i++)
*buf++ = (rdata0 >> i * 8) & 0xff;
- for (i = 4; i < min_t(int, 8, len); i++)
+ for (i = 4; i < min(8, len); i++)
*buf++ = (rdata1 >> (i - 4) * 8) & 0xff;
}
@@ -168,10 +169,10 @@ static void meson_i2c_put_data(struct meson_i2c *i2c, char *buf, int len)
u32 wdata0 = 0, wdata1 = 0;
int i;
- for (i = 0; i < min_t(int, 4, len); i++)
+ for (i = 0; i < min(4, len); i++)
wdata0 |= *buf++ << (i * 8);
- for (i = 4; i < min_t(int, 8, len); i++)
+ for (i = 4; i < min(8, len); i++)
wdata1 |= *buf++ << ((i - 4) * 8);
writel(wdata0, i2c->regs + REG_TOK_WDATA0);
@@ -186,7 +187,7 @@ static void meson_i2c_prepare_xfer(struct meson_i2c *i2c)
bool write = !(i2c->msg->flags & I2C_M_RD);
int i;
- i2c->count = min_t(int, i2c->msg->len - i2c->pos, 8);
+ i2c->count = min(i2c->msg->len - i2c->pos, 8);
for (i = 0; i < i2c->count - 1; i++)
meson_i2c_add_token(i2c, TOKEN_DATA);
@@ -200,19 +201,12 @@ static void meson_i2c_prepare_xfer(struct meson_i2c *i2c)
if (write)
meson_i2c_put_data(i2c, i2c->msg->buf + i2c->pos, i2c->count);
-}
-
-static void meson_i2c_stop(struct meson_i2c *i2c)
-{
- dev_dbg(i2c->dev, "%s: last %d\n", __func__, i2c->last);
- if (i2c->last) {
- i2c->state = STATE_STOP;
+ if (i2c->last && i2c->pos + i2c->count >= i2c->msg->len)
meson_i2c_add_token(i2c, TOKEN_STOP);
- } else {
- i2c->state = STATE_IDLE;
- complete(&i2c->done);
- }
+
+ writel(i2c->tokens[0], i2c->regs + REG_TOK_LIST0);
+ writel(i2c->tokens[1], i2c->regs + REG_TOK_LIST1);
}
static irqreturn_t meson_i2c_irq(int irqno, void *dev_id)
@@ -223,12 +217,18 @@ static irqreturn_t meson_i2c_irq(int irqno, void *dev_id)
spin_lock(&i2c->lock);
meson_i2c_reset_tokens(i2c);
+ meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_START, 0);
ctrl = readl(i2c->regs + REG_CTRL);
dev_dbg(i2c->dev, "irq: state %d, pos %d, count %d, ctrl %08x\n",
i2c->state, i2c->pos, i2c->count, ctrl);
- if (ctrl & REG_CTRL_ERROR && i2c->state != STATE_IDLE) {
+ if (i2c->state == STATE_IDLE) {
+ spin_unlock(&i2c->lock);
+ return IRQ_NONE;
+ }
+
+ if (ctrl & REG_CTRL_ERROR) {
/*
* The bit is set when the IGNORE_NAK bit is cleared
* and the device didn't respond. In this case, the
@@ -242,48 +242,21 @@ static irqreturn_t meson_i2c_irq(int irqno, void *dev_id)
goto out;
}
- switch (i2c->state) {
- case STATE_READ:
- if (i2c->count > 0) {
- meson_i2c_get_data(i2c, i2c->msg->buf + i2c->pos,
- i2c->count);
- i2c->pos += i2c->count;
- }
-
- if (i2c->pos >= i2c->msg->len) {
- meson_i2c_stop(i2c);
- break;
- }
-
- meson_i2c_prepare_xfer(i2c);
- break;
- case STATE_WRITE:
- i2c->pos += i2c->count;
+ if (i2c->state == STATE_READ && i2c->count)
+ meson_i2c_get_data(i2c, i2c->msg->buf + i2c->pos, i2c->count);
- if (i2c->pos >= i2c->msg->len) {
- meson_i2c_stop(i2c);
- break;
- }
+ i2c->pos += i2c->count;
- meson_i2c_prepare_xfer(i2c);
- break;
- case STATE_STOP:
+ if (i2c->pos >= i2c->msg->len) {
i2c->state = STATE_IDLE;
complete(&i2c->done);
- break;
- case STATE_IDLE:
- break;
+ goto out;
}
+ /* Restart the processing */
+ meson_i2c_prepare_xfer(i2c);
+ meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_START, REG_CTRL_START);
out:
- if (i2c->state != STATE_IDLE) {
- /* Restart the processing */
- meson_i2c_write_tokens(i2c);
- meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_START, 0);
- meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_START,
- REG_CTRL_START);
- }
-
spin_unlock(&i2c->lock);
return IRQ_HANDLED;
@@ -323,7 +296,6 @@ static int meson_i2c_xfer_msg(struct meson_i2c *i2c, struct i2c_msg *msg,
i2c->state = (msg->flags & I2C_M_RD) ? STATE_READ : STATE_WRITE;
meson_i2c_prepare_xfer(i2c);
- meson_i2c_write_tokens(i2c);
reinit_completion(&i2c->done);
/* Start the transfer */
@@ -359,21 +331,19 @@ static int meson_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
int num)
{
struct meson_i2c *i2c = adap->algo_data;
- int i, ret = 0, count = 0;
+ int i, ret = 0;
clk_enable(i2c->clk);
- meson_i2c_set_clk_div(i2c);
for (i = 0; i < num; i++) {
ret = meson_i2c_xfer_msg(i2c, msgs + i, i == num - 1);
if (ret)
break;
- count++;
}
clk_disable(i2c->clk);
- return ret ? ret : count;
+ return ret ?: i;
}
static u32 meson_i2c_func(struct i2c_adapter *adap)
@@ -391,15 +361,14 @@ static int meson_i2c_probe(struct platform_device *pdev)
struct device_node *np = pdev->dev.of_node;
struct meson_i2c *i2c;
struct resource *mem;
- int ret = 0;
+ struct i2c_timings timings;
+ int irq, ret = 0;
i2c = devm_kzalloc(&pdev->dev, sizeof(struct meson_i2c), GFP_KERNEL);
if (!i2c)
return -ENOMEM;
- if (of_property_read_u32(pdev->dev.of_node, "clock-frequency",
- &i2c->frequency))
- i2c->frequency = DEFAULT_FREQ;
+ i2c_parse_fw_timings(&pdev->dev, &timings, true);
i2c->dev = &pdev->dev;
platform_set_drvdata(pdev, i2c);
@@ -418,14 +387,13 @@ static int meson_i2c_probe(struct platform_device *pdev)
if (IS_ERR(i2c->regs))
return PTR_ERR(i2c->regs);
- i2c->irq = platform_get_irq(pdev, 0);
- if (i2c->irq < 0) {
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
dev_err(&pdev->dev, "can't find IRQ\n");
- return i2c->irq;
+ return irq;
}
- ret = devm_request_irq(&pdev->dev, i2c->irq, meson_i2c_irq,
- 0, dev_name(&pdev->dev), i2c);
+ ret = devm_request_irq(&pdev->dev, irq, meson_i2c_irq, 0, NULL, i2c);
if (ret < 0) {
dev_err(&pdev->dev, "can't request IRQ\n");
return ret;
@@ -457,6 +425,8 @@ static int meson_i2c_probe(struct platform_device *pdev)
return ret;
}
+ meson_i2c_set_clk_div(i2c, timings.bus_freq_hz);
+
return 0;
}
diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
index a50bd6891e27..cf737ec8563b 100644
--- a/drivers/i2c/busses/i2c-mv64xxx.c
+++ b/drivers/i2c/busses/i2c-mv64xxx.c
@@ -823,13 +823,10 @@ mv64xxx_of_config(struct mv64xxx_i2c_data *drv_data,
drv_data->rstc = devm_reset_control_get_optional(dev, NULL);
if (IS_ERR(drv_data->rstc)) {
- if (PTR_ERR(drv_data->rstc) == -EPROBE_DEFER) {
- rc = -EPROBE_DEFER;
- goto out;
- }
- } else {
- reset_control_deassert(drv_data->rstc);
+ rc = PTR_ERR(drv_data->rstc);
+ goto out;
}
+ reset_control_deassert(drv_data->rstc);
/* Its not yet defined how timeouts will be specified in device tree.
* So hard code the value to 1 second.
@@ -951,8 +948,7 @@ mv64xxx_i2c_probe(struct platform_device *pd)
exit_free_irq:
free_irq(drv_data->irq, drv_data);
exit_reset:
- if (!IS_ERR_OR_NULL(drv_data->rstc))
- reset_control_assert(drv_data->rstc);
+ reset_control_assert(drv_data->rstc);
exit_clk:
/* Not all platforms have a clk */
if (!IS_ERR(drv_data->clk))
@@ -968,8 +964,7 @@ mv64xxx_i2c_remove(struct platform_device *dev)
i2c_del_adapter(&drv_data->adapter);
free_irq(drv_data->irq, drv_data);
- if (!IS_ERR_OR_NULL(drv_data->rstc))
- reset_control_assert(drv_data->rstc);
+ reset_control_assert(drv_data->rstc);
/* Not all platforms have a clk */
if (!IS_ERR(drv_data->clk))
clk_disable_unprepare(drv_data->clk);
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 26f2ff22e97e..214bf2835d1f 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -700,6 +700,8 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
pm_runtime_get_sync(dev);
+ rcar_i2c_init(priv);
+
ret = rcar_i2c_bus_barrier(priv);
if (ret < 0)
goto out;
@@ -751,6 +753,7 @@ static int rcar_reg_slave(struct i2c_client *slave)
if (slave->flags & I2C_CLIENT_TEN)
return -EAFNOSUPPORT;
+ /* Keep device active for slave address detection logic */
pm_runtime_get_sync(rcar_i2c_priv_to_dev(priv));
priv->slave = slave;
@@ -854,15 +857,14 @@ static int rcar_i2c_probe(struct platform_device *pdev)
priv->dma_direction = DMA_NONE;
priv->dma_rx = priv->dma_tx = ERR_PTR(-EPROBE_DEFER);
+ /* Activate device for clock calculation */
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
ret = rcar_i2c_clock_calculate(priv, &i2c_t);
if (ret < 0)
goto out_pm_put;
- rcar_i2c_init(priv);
-
- /* Don't suspend when multi-master to keep arbitration working */
+ /* Stay always active when multi-master to keep arbitration working */
if (of_property_read_bool(dev->of_node, "multi-master"))
priv->flags |= ID_P_PM_BLOCKED;
else
diff --git a/drivers/i2c/busses/i2c-scmi.c b/drivers/i2c/busses/i2c-scmi.c
index dfc98df7b1b6..7aa7b9cb6203 100644
--- a/drivers/i2c/busses/i2c-scmi.c
+++ b/drivers/i2c/busses/i2c-scmi.c
@@ -18,6 +18,9 @@
#define ACPI_SMBUS_HC_CLASS "smbus"
#define ACPI_SMBUS_HC_DEVICE_NAME "cmi"
+/* SMBUS HID definition as supported by Microsoft Windows */
+#define ACPI_SMBUS_MS_HID "SMB0001"
+
ACPI_MODULE_NAME("smbus_cmi");
struct smbus_methods_t {
@@ -51,6 +54,7 @@ static const struct smbus_methods_t ibm_smbus_methods = {
static const struct acpi_device_id acpi_smbus_cmi_ids[] = {
{"SMBUS01", (kernel_ulong_t)&smbus_methods},
{ACPI_SMBUS_IBM_HID, (kernel_ulong_t)&ibm_smbus_methods},
+ {ACPI_SMBUS_MS_HID, (kernel_ulong_t)&smbus_methods},
{"", 0}
};
MODULE_DEVICE_TABLE(acpi, acpi_smbus_cmi_ids);
diff --git a/drivers/i2c/busses/i2c-tegra-bpmp.c b/drivers/i2c/busses/i2c-tegra-bpmp.c
index 9eed69d5e17e..f6cd35d0a2ac 100644
--- a/drivers/i2c/busses/i2c-tegra-bpmp.c
+++ b/drivers/i2c/busses/i2c-tegra-bpmp.c
@@ -340,7 +340,7 @@ static struct platform_driver tegra_bpmp_i2c_driver = {
};
module_platform_driver(tegra_bpmp_i2c_driver);
-MODULE_DESCRIPTION("NVIDIA Tegra BPMP I2C bus contoller driver");
+MODULE_DESCRIPTION("NVIDIA Tegra BPMP I2C bus controller driver");
MODULE_AUTHOR("Shardar Shariff Md <smohammed@nvidia.com>");
MODULE_AUTHOR("Juha-Matti Tilli");
MODULE_LICENSE("GPL v2");
diff --git a/drivers/i2c/busses/i2c-thunderx-pcidrv.c b/drivers/i2c/busses/i2c-thunderx-pcidrv.c
index 1d4c2beacf2e..ea35a895b568 100644
--- a/drivers/i2c/busses/i2c-thunderx-pcidrv.c
+++ b/drivers/i2c/busses/i2c-thunderx-pcidrv.c
@@ -85,17 +85,23 @@ static void thunder_i2c_clock_enable(struct device *dev, struct octeon_i2c *i2c)
{
int ret;
- i2c->clk = clk_get(dev, NULL);
- if (IS_ERR(i2c->clk)) {
- i2c->clk = NULL;
- goto skip;
+ if (acpi_disabled) {
+ /* DT */
+ i2c->clk = clk_get(dev, NULL);
+ if (IS_ERR(i2c->clk)) {
+ i2c->clk = NULL;
+ goto skip;
+ }
+
+ ret = clk_prepare_enable(i2c->clk);
+ if (ret)
+ goto skip;
+ i2c->sys_freq = clk_get_rate(i2c->clk);
+ } else {
+ /* ACPI */
+ device_property_read_u32(dev, "sclk", &i2c->sys_freq);
}
- ret = clk_prepare_enable(i2c->clk);
- if (ret)
- goto skip;
- i2c->sys_freq = clk_get_rate(i2c->clk);
-
skip:
if (!i2c->sys_freq)
i2c->sys_freq = SYS_FREQ_DEFAULT;
@@ -205,6 +211,7 @@ static int thunder_i2c_probe_pci(struct pci_dev *pdev,
i2c->adap = thunderx_i2c_ops;
i2c->adap.retries = 5;
+ i2c->adap.class = I2C_CLASS_HWMON;
i2c->adap.bus_recovery_info = &octeon_i2c_recovery_info;
i2c->adap.dev.parent = dev;
i2c->adap.dev.of_node = pdev->dev.of_node;
diff --git a/drivers/i2c/busses/i2c-xlp9xx.c b/drivers/i2c/busses/i2c-xlp9xx.c
index 66b464d52c9c..ae80228104e9 100644
--- a/drivers/i2c/busses/i2c-xlp9xx.c
+++ b/drivers/i2c/busses/i2c-xlp9xx.c
@@ -432,6 +432,7 @@ MODULE_DEVICE_TABLE(of, xlp9xx_i2c_of_match);
#ifdef CONFIG_ACPI
static const struct acpi_device_id xlp9xx_i2c_acpi_ids[] = {
{"BRCM9007", 0},
+ {"CAV9007", 0},
{}
};
MODULE_DEVICE_TABLE(acpi, xlp9xx_i2c_acpi_ids);
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index d2402bbf6729..7a065c4260f3 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -112,6 +112,8 @@ struct i2c_acpi_lookup {
acpi_handle adapter_handle;
acpi_handle device_handle;
acpi_handle search_handle;
+ int n;
+ int index;
u32 speed;
u32 min_speed;
};
@@ -130,6 +132,9 @@ static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data)
if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C)
return 1;
+ if (lookup->index != -1 && lookup->n++ != lookup->index)
+ return 1;
+
status = acpi_get_handle(lookup->device_handle,
sb->resource_source.string_ptr,
&lookup->adapter_handle);
@@ -182,6 +187,7 @@ static int i2c_acpi_get_info(struct acpi_device *adev,
memset(&lookup, 0, sizeof(lookup));
lookup.info = info;
+ lookup.index = -1;
ret = i2c_acpi_do_lookup(adev, &lookup);
if (ret)
@@ -328,6 +334,7 @@ u32 i2c_acpi_find_bus_speed(struct device *dev)
lookup.search_handle = ACPI_HANDLE(dev);
lookup.min_speed = UINT_MAX;
lookup.info = &dummy;
+ lookup.index = -1;
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
I2C_ACPI_MAX_SCAN_DEPTH,
@@ -414,6 +421,55 @@ static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value,
static struct notifier_block i2c_acpi_notifier = {
.notifier_call = i2c_acpi_notify,
};
+
+/**
+ * i2c_acpi_new_device - Create i2c-client for the Nth I2cSerialBus resource
+ * @dev: Device owning the ACPI resources to get the client from
+ * @index: Index of ACPI resource to get
+ * @info: describes the I2C device; note this is modified (addr gets set)
+ * Context: can sleep
+ *
+ * By default the i2c subsys creates an i2c-client for the first I2cSerialBus
+ * resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus
+ * resources, in that case this function can be used to create an i2c-client
+ * for other I2cSerialBus resources in the Current Resource Settings table.
+ *
+ * Also see i2c_new_device, which this function calls to create the i2c-client.
+ *
+ * Returns a pointer to the new i2c-client, or NULL if the adapter is not found.
+ */
+struct i2c_client *i2c_acpi_new_device(struct device *dev, int index,
+ struct i2c_board_info *info)
+{
+ struct i2c_acpi_lookup lookup;
+ struct i2c_adapter *adapter;
+ struct acpi_device *adev;
+ LIST_HEAD(resource_list);
+ int ret;
+
+ adev = ACPI_COMPANION(dev);
+ if (!adev)
+ return NULL;
+
+ memset(&lookup, 0, sizeof(lookup));
+ lookup.info = info;
+ lookup.device_handle = acpi_device_handle(adev);
+ lookup.index = index;
+
+ ret = acpi_dev_get_resources(adev, &resource_list,
+ i2c_acpi_fill_info, &lookup);
+ acpi_dev_free_resource_list(&resource_list);
+
+ if (ret < 0 || !info->addr)
+ return NULL;
+
+ adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle);
+ if (!adapter)
+ return NULL;
+
+ return i2c_new_device(adapter, info);
+}
+EXPORT_SYMBOL_GPL(i2c_acpi_new_device);
#else /* CONFIG_ACPI */
static inline void i2c_acpi_register_devices(struct i2c_adapter *adap) { }
extern struct notifier_block i2c_acpi_notifier;
@@ -929,7 +985,9 @@ static int i2c_device_probe(struct device *dev)
if (!client)
return 0;
- if (!client->irq) {
+ driver = to_i2c_driver(dev->driver);
+
+ if (!client->irq && !driver->disable_i2c_core_irq_mapping) {
int irq = -ENOENT;
if (client->flags & I2C_CLIENT_HOST_NOTIFY) {
@@ -951,8 +1009,6 @@ static int i2c_device_probe(struct device *dev)
client->irq = irq;
}
- driver = to_i2c_driver(dev->driver);
-
/*
* An I2C ID table is not mandatory, if and only if, a suitable Device
* Tree match table entry is supplied for the probing device.
diff --git a/drivers/i2c/i2c-mux.c b/drivers/i2c/i2c-mux.c
index 2178266bca79..26f7237558ba 100644
--- a/drivers/i2c/i2c-mux.c
+++ b/drivers/i2c/i2c-mux.c
@@ -395,13 +395,16 @@ int i2c_mux_add_adapter(struct i2c_mux_core *muxc,
if (force_nr) {
priv->adap.nr = force_nr;
ret = i2c_add_numbered_adapter(&priv->adap);
+ dev_err(&parent->dev,
+ "failed to add mux-adapter %u as bus %u (error=%d)\n",
+ chan_id, force_nr, ret);
} else {
ret = i2c_add_adapter(&priv->adap);
+ dev_err(&parent->dev,
+ "failed to add mux-adapter %u (error=%d)\n",
+ chan_id, ret);
}
if (ret < 0) {
- dev_err(&parent->dev,
- "failed to add mux-adapter (error=%d)\n",
- ret);
kfree(priv);
return ret;
}
diff --git a/drivers/i2c/muxes/Kconfig b/drivers/i2c/muxes/Kconfig
index 10b3d17ae3ea..1e160fc37ecc 100644
--- a/drivers/i2c/muxes/Kconfig
+++ b/drivers/i2c/muxes/Kconfig
@@ -30,6 +30,17 @@ config I2C_MUX_GPIO
This driver can also be built as a module. If so, the module
will be called i2c-mux-gpio.
+config I2C_MUX_LTC4306
+ tristate "LTC LTC4306/5 I2C multiplexer"
+ select GPIOLIB
+ select REGMAP_I2C
+ help
+ If you say yes here you get support for the Analog Devices
+ LTC4306 or LTC4305 I2C mux/switch devices.
+
+ This driver can also be built as a module. If so, the module
+ will be called i2c-mux-ltc4306.
+
config I2C_MUX_PCA9541
tristate "NXP PCA9541 I2C Master Selector"
help
diff --git a/drivers/i2c/muxes/Makefile b/drivers/i2c/muxes/Makefile
index 9948fa45037f..ff7618cd5312 100644
--- a/drivers/i2c/muxes/Makefile
+++ b/drivers/i2c/muxes/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_I2C_ARB_GPIO_CHALLENGE) += i2c-arb-gpio-challenge.o
obj-$(CONFIG_I2C_DEMUX_PINCTRL) += i2c-demux-pinctrl.o
obj-$(CONFIG_I2C_MUX_GPIO) += i2c-mux-gpio.o
+obj-$(CONFIG_I2C_MUX_LTC4306) += i2c-mux-ltc4306.o
obj-$(CONFIG_I2C_MUX_MLXCPLD) += i2c-mux-mlxcpld.o
obj-$(CONFIG_I2C_MUX_PCA9541) += i2c-mux-pca9541.o
obj-$(CONFIG_I2C_MUX_PCA954x) += i2c-mux-pca954x.o
diff --git a/drivers/i2c/muxes/i2c-arb-gpio-challenge.c b/drivers/i2c/muxes/i2c-arb-gpio-challenge.c
index 86fc2d4c081b..812b8cff265f 100644
--- a/drivers/i2c/muxes/i2c-arb-gpio-challenge.c
+++ b/drivers/i2c/muxes/i2c-arb-gpio-challenge.c
@@ -202,10 +202,8 @@ static int i2c_arbitrator_probe(struct platform_device *pdev)
/* Actually add the mux adapter */
ret = i2c_mux_add_adapter(muxc, 0, 0, 0);
- if (ret) {
- dev_err(dev, "Failed to add adapter\n");
+ if (ret)
i2c_put_adapter(muxc->parent);
- }
return ret;
}
diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
index 655684d621a4..1a9973ede443 100644
--- a/drivers/i2c/muxes/i2c-mux-gpio.c
+++ b/drivers/i2c/muxes/i2c-mux-gpio.c
@@ -245,10 +245,8 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
unsigned int class = mux->data.classes ? mux->data.classes[i] : 0;
ret = i2c_mux_add_adapter(muxc, nr, mux->data.values[i], class);
- if (ret) {
- dev_err(&pdev->dev, "Failed to add adapter %d\n", i);
+ if (ret)
goto add_adapter_failed;
- }
}
dev_info(&pdev->dev, "%d port mux on %s adapter\n",
diff --git a/drivers/i2c/muxes/i2c-mux-ltc4306.c b/drivers/i2c/muxes/i2c-mux-ltc4306.c
new file mode 100644
index 000000000000..311b1cced0c0
--- /dev/null
+++ b/drivers/i2c/muxes/i2c-mux-ltc4306.c
@@ -0,0 +1,322 @@
+/*
+ * Linear Technology LTC4306 and LTC4305 I2C multiplexer/switch
+ *
+ * Copyright (C) 2017 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ *
+ * Based on: i2c-mux-pca954x.c
+ *
+ * Datasheet: http://cds.linear.com/docs/en/datasheet/4306.pdf
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/gpio/driver.h>
+#include <linux/i2c-mux.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#define LTC4305_MAX_NCHANS 2
+#define LTC4306_MAX_NCHANS 4
+
+#define LTC_REG_STATUS 0x0
+#define LTC_REG_CONFIG 0x1
+#define LTC_REG_MODE 0x2
+#define LTC_REG_SWITCH 0x3
+
+#define LTC_DOWNSTREAM_ACCL_EN BIT(6)
+#define LTC_UPSTREAM_ACCL_EN BIT(7)
+
+#define LTC_GPIO_ALL_INPUT 0xC0
+#define LTC_SWITCH_MASK 0xF0
+
+enum ltc_type {
+ ltc_4305,
+ ltc_4306,
+};
+
+struct chip_desc {
+ u8 nchans;
+ u8 num_gpios;
+};
+
+struct ltc4306 {
+ struct regmap *regmap;
+ struct gpio_chip gpiochip;
+ const struct chip_desc *chip;
+};
+
+static const struct chip_desc chips[] = {
+ [ltc_4305] = {
+ .nchans = LTC4305_MAX_NCHANS,
+ },
+ [ltc_4306] = {
+ .nchans = LTC4306_MAX_NCHANS,
+ .num_gpios = 2,
+ },
+};
+
+static bool ltc4306_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+ return (reg == LTC_REG_CONFIG) ? true : false;
+}
+
+static const struct regmap_config ltc4306_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = LTC_REG_SWITCH,
+ .volatile_reg = ltc4306_is_volatile_reg,
+ .cache_type = REGCACHE_FLAT,
+};
+
+static int ltc4306_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct ltc4306 *data = gpiochip_get_data(chip);
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(data->regmap, LTC_REG_CONFIG, &val);
+ if (ret < 0)
+ return ret;
+
+ return !!(val & BIT(1 - offset));
+}
+
+static void ltc4306_gpio_set(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ struct ltc4306 *data = gpiochip_get_data(chip);
+
+ regmap_update_bits(data->regmap, LTC_REG_CONFIG, BIT(5 - offset),
+ value ? BIT(5 - offset) : 0);
+}
+
+static int ltc4306_gpio_get_direction(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ struct ltc4306 *data = gpiochip_get_data(chip);
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(data->regmap, LTC_REG_MODE, &val);
+ if (ret < 0)
+ return ret;
+
+ return !!(val & BIT(7 - offset));
+}
+
+static int ltc4306_gpio_direction_input(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ struct ltc4306 *data = gpiochip_get_data(chip);
+
+ return regmap_update_bits(data->regmap, LTC_REG_MODE,
+ BIT(7 - offset), BIT(7 - offset));
+}
+
+static int ltc4306_gpio_direction_output(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ struct ltc4306 *data = gpiochip_get_data(chip);
+
+ ltc4306_gpio_set(chip, offset, value);
+ return regmap_update_bits(data->regmap, LTC_REG_MODE,
+ BIT(7 - offset), 0);
+}
+
+static int ltc4306_gpio_set_config(struct gpio_chip *chip,
+ unsigned int offset, unsigned long config)
+{
+ struct ltc4306 *data = gpiochip_get_data(chip);
+ unsigned int val;
+
+ switch (pinconf_to_config_param(config)) {
+ case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+ val = 0;
+ break;
+ case PIN_CONFIG_DRIVE_PUSH_PULL:
+ val = BIT(4 - offset);
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ return regmap_update_bits(data->regmap, LTC_REG_MODE,
+ BIT(4 - offset), val);
+}
+
+static int ltc4306_gpio_init(struct ltc4306 *data)
+{
+ struct device *dev = regmap_get_device(data->regmap);
+
+ if (!data->chip->num_gpios)
+ return 0;
+
+ data->gpiochip.label = dev_name(dev);
+ data->gpiochip.base = -1;
+ data->gpiochip.ngpio = data->chip->num_gpios;
+ data->gpiochip.parent = dev;
+ data->gpiochip.can_sleep = true;
+ data->gpiochip.get_direction = ltc4306_gpio_get_direction;
+ data->gpiochip.direction_input = ltc4306_gpio_direction_input;
+ data->gpiochip.direction_output = ltc4306_gpio_direction_output;
+ data->gpiochip.get = ltc4306_gpio_get;
+ data->gpiochip.set = ltc4306_gpio_set;
+ data->gpiochip.set_config = ltc4306_gpio_set_config;
+ data->gpiochip.owner = THIS_MODULE;
+
+ /* gpiolib assumes all GPIOs default input */
+ regmap_write(data->regmap, LTC_REG_MODE, LTC_GPIO_ALL_INPUT);
+
+ return devm_gpiochip_add_data(dev, &data->gpiochip, data);
+}
+
+static int ltc4306_select_mux(struct i2c_mux_core *muxc, u32 chan)
+{
+ struct ltc4306 *data = i2c_mux_priv(muxc);
+
+ return regmap_update_bits(data->regmap, LTC_REG_SWITCH,
+ LTC_SWITCH_MASK, BIT(7 - chan));
+}
+
+static int ltc4306_deselect_mux(struct i2c_mux_core *muxc, u32 chan)
+{
+ struct ltc4306 *data = i2c_mux_priv(muxc);
+
+ return regmap_update_bits(data->regmap, LTC_REG_SWITCH,
+ LTC_SWITCH_MASK, 0);
+}
+
+static const struct i2c_device_id ltc4306_id[] = {
+ { "ltc4305", ltc_4305 },
+ { "ltc4306", ltc_4306 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ltc4306_id);
+
+static const struct of_device_id ltc4306_of_match[] = {
+ { .compatible = "lltc,ltc4305", .data = &chips[ltc_4305] },
+ { .compatible = "lltc,ltc4306", .data = &chips[ltc_4306] },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ltc4306_of_match);
+
+static int ltc4306_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct i2c_adapter *adap = to_i2c_adapter(client->dev.parent);
+ const struct chip_desc *chip;
+ struct i2c_mux_core *muxc;
+ struct ltc4306 *data;
+ struct gpio_desc *gpio;
+ bool idle_disc;
+ unsigned int val = 0;
+ int num, ret;
+
+ chip = of_device_get_match_data(&client->dev);
+
+ if (!chip)
+ chip = &chips[id->driver_data];
+
+ idle_disc = device_property_read_bool(&client->dev,
+ "i2c-mux-idle-disconnect");
+
+ muxc = i2c_mux_alloc(adap, &client->dev,
+ chip->nchans, sizeof(*data),
+ I2C_MUX_LOCKED, ltc4306_select_mux,
+ idle_disc ? ltc4306_deselect_mux : NULL);
+ if (!muxc)
+ return -ENOMEM;
+ data = i2c_mux_priv(muxc);
+ data->chip = chip;
+
+ i2c_set_clientdata(client, muxc);
+
+ data->regmap = devm_regmap_init_i2c(client, &ltc4306_regmap_config);
+ if (IS_ERR(data->regmap)) {
+ ret = PTR_ERR(data->regmap);
+ dev_err(&client->dev, "Failed to allocate register map: %d\n",
+ ret);
+ return ret;
+ }
+
+ /* Reset and enable the mux if an enable GPIO is specified. */
+ gpio = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_LOW);
+ if (IS_ERR(gpio))
+ return PTR_ERR(gpio);
+
+ if (gpio) {
+ udelay(1);
+ gpiod_set_value(gpio, 1);
+ }
+
+ /*
+ * Write the mux register at addr to verify
+ * that the mux is in fact present. This also
+ * initializes the mux to disconnected state.
+ */
+ if (regmap_write(data->regmap, LTC_REG_SWITCH, 0) < 0) {
+ dev_warn(&client->dev, "probe failed\n");
+ return -ENODEV;
+ }
+
+ if (device_property_read_bool(&client->dev,
+ "ltc,downstream-accelerators-enable"))
+ val |= LTC_DOWNSTREAM_ACCL_EN;
+
+ if (device_property_read_bool(&client->dev,
+ "ltc,upstream-accelerators-enable"))
+ val |= LTC_UPSTREAM_ACCL_EN;
+
+ if (regmap_write(data->regmap, LTC_REG_CONFIG, val) < 0)
+ return -ENODEV;
+
+ ret = ltc4306_gpio_init(data);
+ if (ret < 0)
+ return ret;
+
+ /* Now create an adapter for each channel */
+ for (num = 0; num < chip->nchans; num++) {
+ ret = i2c_mux_add_adapter(muxc, 0, num, 0);
+ if (ret) {
+ i2c_mux_del_adapters(muxc);
+ return ret;
+ }
+ }
+
+ dev_info(&client->dev,
+ "registered %d multiplexed busses for I2C switch %s\n",
+ num, client->name);
+
+ return 0;
+}
+
+static int ltc4306_remove(struct i2c_client *client)
+{
+ struct i2c_mux_core *muxc = i2c_get_clientdata(client);
+
+ i2c_mux_del_adapters(muxc);
+
+ return 0;
+}
+
+static struct i2c_driver ltc4306_driver = {
+ .driver = {
+ .name = "ltc4306",
+ .of_match_table = of_match_ptr(ltc4306_of_match),
+ },
+ .probe = ltc4306_probe,
+ .remove = ltc4306_remove,
+ .id_table = ltc4306_id,
+};
+
+module_i2c_driver(ltc4306_driver);
+
+MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
+MODULE_DESCRIPTION("Linear Technology LTC4306, LTC4305 I2C mux/switch driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/i2c/muxes/i2c-mux-pca9541.c b/drivers/i2c/muxes/i2c-mux-pca9541.c
index 77840f7845a1..9e318c9516c7 100644
--- a/drivers/i2c/muxes/i2c-mux-pca9541.c
+++ b/drivers/i2c/muxes/i2c-mux-pca9541.c
@@ -369,10 +369,8 @@ static int pca9541_probe(struct i2c_client *client,
i2c_set_clientdata(client, muxc);
ret = i2c_mux_add_adapter(muxc, force, 0, 0);
- if (ret) {
- dev_err(&client->dev, "failed to register master selector\n");
+ if (ret)
return ret;
- }
dev_info(&client->dev, "registered master selector for I2C %s\n",
client->name);
diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c
index ad31d21da316..f1751c290af6 100644
--- a/drivers/i2c/muxes/i2c-mux-pca954x.c
+++ b/drivers/i2c/muxes/i2c-mux-pca954x.c
@@ -84,7 +84,7 @@ struct pca954x {
struct irq_domain *irq;
unsigned int irq_mask;
- spinlock_t lock;
+ raw_spinlock_t lock;
};
/* Provide specs for the PCA954x types we know about */
@@ -252,13 +252,13 @@ static void pca954x_irq_mask(struct irq_data *idata)
unsigned int pos = idata->hwirq;
unsigned long flags;
- spin_lock_irqsave(&data->lock, flags);
+ raw_spin_lock_irqsave(&data->lock, flags);
data->irq_mask &= ~BIT(pos);
if (!data->irq_mask)
disable_irq(data->client->irq);
- spin_unlock_irqrestore(&data->lock, flags);
+ raw_spin_unlock_irqrestore(&data->lock, flags);
}
static void pca954x_irq_unmask(struct irq_data *idata)
@@ -267,13 +267,13 @@ static void pca954x_irq_unmask(struct irq_data *idata)
unsigned int pos = idata->hwirq;
unsigned long flags;
- spin_lock_irqsave(&data->lock, flags);
+ raw_spin_lock_irqsave(&data->lock, flags);
if (!data->irq_mask)
enable_irq(data->client->irq);
data->irq_mask |= BIT(pos);
- spin_unlock_irqrestore(&data->lock, flags);
+ raw_spin_unlock_irqrestore(&data->lock, flags);
}
static int pca954x_irq_set_type(struct irq_data *idata, unsigned int type)
@@ -299,7 +299,7 @@ static int pca954x_irq_setup(struct i2c_mux_core *muxc)
if (!data->chip->has_irq || client->irq <= 0)
return 0;
- spin_lock_init(&data->lock);
+ raw_spin_lock_init(&data->lock);
data->irq = irq_domain_add_linear(client->dev.of_node,
data->chip->nchans,
@@ -413,13 +413,8 @@ static int pca954x_probe(struct i2c_client *client,
idle_disconnect_dt) << num;
ret = i2c_mux_add_adapter(muxc, force, num, class);
-
- if (ret) {
- dev_err(&client->dev,
- "failed to register multiplexed adapter"
- " %d as bus %d\n", num, force);
+ if (ret)
goto fail_del_adapters;
- }
}
dev_info(&client->dev,
diff --git a/drivers/i2c/muxes/i2c-mux-pinctrl.c b/drivers/i2c/muxes/i2c-mux-pinctrl.c
index 35bb775e1b74..7c0c264b07bc 100644
--- a/drivers/i2c/muxes/i2c-mux-pinctrl.c
+++ b/drivers/i2c/muxes/i2c-mux-pinctrl.c
@@ -245,10 +245,8 @@ static int i2c_mux_pinctrl_probe(struct platform_device *pdev)
(mux->pdata->base_bus_num + i) : 0;
ret = i2c_mux_add_adapter(muxc, bus, i, 0);
- if (ret) {
- dev_err(&pdev->dev, "Failed to add adapter %d\n", i);
+ if (ret)
goto err_del_adapter;
- }
}
return 0;
diff --git a/drivers/i2c/muxes/i2c-mux-reg.c b/drivers/i2c/muxes/i2c-mux-reg.c
index c6a90b4a9c62..406d5059072c 100644
--- a/drivers/i2c/muxes/i2c-mux-reg.c
+++ b/drivers/i2c/muxes/i2c-mux-reg.c
@@ -222,10 +222,8 @@ static int i2c_mux_reg_probe(struct platform_device *pdev)
class = mux->data.classes ? mux->data.classes[i] : 0;
ret = i2c_mux_add_adapter(muxc, nr, mux->data.values[i], class);
- if (ret) {
- dev_err(&pdev->dev, "Failed to add adapter %d\n", i);
+ if (ret)
goto add_adapter_failed;
- }
}
dev_dbg(&pdev->dev, "%d port mux on %s adapter\n",