Merge tag 'pwm/for-4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm

Pull pwm updates from Thierry Reding:
 "This contains a couple of fixes and cleanups for the Meson and
  ACPI/LPSS drivers as well as capture support for STM32.

  Note that given the cross- subsystem changes, the STM32 patches were
  merged through the MFD and PWM trees, both sharing an immutable
  branch"

* tag 'pwm/for-4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm:
  pwm: stm32: Fix build warning with CONFIG_DMA_ENGINE disabled
  pwm: stm32: Enforce dependency on CONFIG_MFD_STM32_TIMERS
  ACPI / LPSS: Add missing prv_offset setting for byt/cht PWM devices
  pwm: lpss: platform: Save/restore the ctrl register over a suspend/resume
  dt-bindings: mfd: stm32-timers: Add support for dmas
  pwm: simplify getting .drvdata
  pwm: meson: Fix allocation of PWM channel array

8 files changed, 44 insertions, 12 deletions

diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index 4635cb3..a4d262d 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -401,7 +401,7 @@ config PWM_STI
 
 config PWM_STM32
 	tristate "STMicroelectronics STM32 PWM"
-	depends on MFD_STM32_TIMERS || COMPILE_TEST
+	depends on MFD_STM32_TIMERS
 	help
 	  Generic PWM framework driver for STM32 SoCs.
 
diff --git a/drivers/pwm/pwm-atmel-tcb.c b/drivers/pwm/pwm-atmel-tcb.c
index 4fb1be2..0d0f837 100644
--- a/drivers/pwm/pwm-atmel-tcb.c
+++ b/drivers/pwm/pwm-atmel-tcb.c
@@ -460,8 +460,7 @@ MODULE_DEVICE_TABLE(of, atmel_tcb_pwm_dt_ids);
 #ifdef CONFIG_PM_SLEEP
 static int atmel_tcb_pwm_suspend(struct device *dev)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct atmel_tcb_pwm_chip *tcbpwm = platform_get_drvdata(pdev);
+	struct atmel_tcb_pwm_chip *tcbpwm = dev_get_drvdata(dev);
 	void __iomem *base = tcbpwm->tc->regs;
 	int i;
 
@@ -478,8 +477,7 @@ static int atmel_tcb_pwm_suspend(struct device *dev)
 
 static int atmel_tcb_pwm_resume(struct device *dev)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct atmel_tcb_pwm_chip *tcbpwm = platform_get_drvdata(pdev);
+	struct atmel_tcb_pwm_chip *tcbpwm = dev_get_drvdata(dev);
 	void __iomem *base = tcbpwm->tc->regs;
 	int i;
 
diff --git a/drivers/pwm/pwm-lpss-platform.c b/drivers/pwm/pwm-lpss-platform.c
index 5d6ed15..5561b9e 100644
--- a/drivers/pwm/pwm-lpss-platform.c
+++ b/drivers/pwm/pwm-lpss-platform.c
@@ -74,6 +74,10 @@ static int pwm_lpss_remove_platform(struct platform_device *pdev)
 	return pwm_lpss_remove(lpwm);
 }
 
+static SIMPLE_DEV_PM_OPS(pwm_lpss_platform_pm_ops,
+			 pwm_lpss_suspend,
+			 pwm_lpss_resume);
+
 static const struct acpi_device_id pwm_lpss_acpi_match[] = {
 	{ "80860F09", (unsigned long)&pwm_lpss_byt_info },
 	{ "80862288", (unsigned long)&pwm_lpss_bsw_info },
@@ -86,6 +90,7 @@ static struct platform_driver pwm_lpss_driver_platform = {
 	.driver = {
 		.name = "pwm-lpss",
 		.acpi_match_table = pwm_lpss_acpi_match,
+		.pm = &pwm_lpss_platform_pm_ops,
 	},
 	.probe = pwm_lpss_probe_platform,
 	.remove = pwm_lpss_remove_platform,
diff --git a/drivers/pwm/pwm-lpss.c b/drivers/pwm/pwm-lpss.c
index 8db0d40..4721a26 100644
--- a/drivers/pwm/pwm-lpss.c
+++ b/drivers/pwm/pwm-lpss.c
@@ -32,10 +32,13 @@
 /* Size of each PWM register space if multiple */
 #define PWM_SIZE			0x400
 
+#define MAX_PWMS			4
+
 struct pwm_lpss_chip {
 	struct pwm_chip chip;
 	void __iomem *regs;
 	const struct pwm_lpss_boardinfo *info;
+	u32 saved_ctrl[MAX_PWMS];
 };
 
 static inline struct pwm_lpss_chip *to_lpwm(struct pwm_chip *chip)
@@ -177,6 +180,9 @@ struct pwm_lpss_chip *pwm_lpss_probe(struct device *dev, struct resource *r,
 	unsigned long c;
 	int ret;
 
+	if (WARN_ON(info->npwm > MAX_PWMS))
+		return ERR_PTR(-ENODEV);
+
 	lpwm = devm_kzalloc(dev, sizeof(*lpwm), GFP_KERNEL);
 	if (!lpwm)
 		return ERR_PTR(-ENOMEM);
@@ -212,6 +218,30 @@ int pwm_lpss_remove(struct pwm_lpss_chip *lpwm)
 }
 EXPORT_SYMBOL_GPL(pwm_lpss_remove);
 
+int pwm_lpss_suspend(struct device *dev)
+{
+	struct pwm_lpss_chip *lpwm = dev_get_drvdata(dev);
+	int i;
+
+	for (i = 0; i < lpwm->info->npwm; i++)
+		lpwm->saved_ctrl[i] = readl(lpwm->regs + i * PWM_SIZE + PWM);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pwm_lpss_suspend);
+
+int pwm_lpss_resume(struct device *dev)
+{
+	struct pwm_lpss_chip *lpwm = dev_get_drvdata(dev);
+	int i;
+
+	for (i = 0; i < lpwm->info->npwm; i++)
+		writel(lpwm->saved_ctrl[i], lpwm->regs + i * PWM_SIZE + PWM);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pwm_lpss_resume);
+
 MODULE_DESCRIPTION("PWM driver for Intel LPSS");
 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
 MODULE_LICENSE("GPL v2");
diff --git a/drivers/pwm/pwm-lpss.h b/drivers/pwm/pwm-lpss.h
index 98306bb..7a4238a 100644
--- a/drivers/pwm/pwm-lpss.h
+++ b/drivers/pwm/pwm-lpss.h
@@ -28,5 +28,7 @@ struct pwm_lpss_boardinfo {
 struct pwm_lpss_chip *pwm_lpss_probe(struct device *dev, struct resource *r,
 				     const struct pwm_lpss_boardinfo *info);
 int pwm_lpss_remove(struct pwm_lpss_chip *lpwm);
+int pwm_lpss_suspend(struct device *dev);
+int pwm_lpss_resume(struct device *dev);
 
 #endif	/* __PWM_LPSS_H */
diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
index 0767deb..822860b 100644
--- a/drivers/pwm/pwm-meson.c
+++ b/drivers/pwm/pwm-meson.c
@@ -541,8 +541,8 @@ static int meson_pwm_probe(struct platform_device *pdev)
 	meson->data = of_device_get_match_data(&pdev->dev);
 	meson->inverter_mask = BIT(meson->chip.npwm) - 1;
 
-	channels = devm_kcalloc(&pdev->dev, meson->chip.npwm, sizeof(*meson),
-				GFP_KERNEL);
+	channels = devm_kcalloc(&pdev->dev, meson->chip.npwm,
+				sizeof(*channels), GFP_KERNEL);
 	if (!channels)
 		return -ENOMEM;
 
diff --git a/drivers/pwm/pwm-rcar.c b/drivers/pwm/pwm-rcar.c
index 91d11f2..748f614 100644
--- a/drivers/pwm/pwm-rcar.c
+++ b/drivers/pwm/pwm-rcar.c
@@ -261,8 +261,7 @@ MODULE_DEVICE_TABLE(of, rcar_pwm_of_table);
 #ifdef CONFIG_PM_SLEEP
 static struct pwm_device *rcar_pwm_dev_to_pwm_dev(struct device *dev)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct rcar_pwm_chip *rcar_pwm = platform_get_drvdata(pdev);
+	struct rcar_pwm_chip *rcar_pwm = dev_get_drvdata(dev);
 	struct pwm_chip *chip = &rcar_pwm->chip;
 
 	return &chip->pwms[0];
diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c
index 09383c6..4f84255 100644
--- a/drivers/pwm/pwm-stm32.c
+++ b/drivers/pwm/pwm-stm32.c
@@ -484,9 +484,7 @@ static int stm32_pwm_apply_locked(struct pwm_chip *chip, struct pwm_device *pwm,
 static const struct pwm_ops stm32pwm_ops = {
 	.owner = THIS_MODULE,
 	.apply = stm32_pwm_apply_locked,
-#if IS_ENABLED(CONFIG_DMA_ENGINE)
-	.capture = stm32_pwm_capture,
-#endif
+	.capture = IS_ENABLED(CONFIG_DMA_ENGINE) ? stm32_pwm_capture : NULL,
 };
 
 static int stm32_pwm_set_breakinput(struct stm32_pwm *priv,