Merge tag 'for-3.9-rc1' of git://gitorious.org/linux-pwm/linux-pwm

Pull PWM changes from Thierry Reding:
 "A new driver has been added to support the PWM mode of the timer
  counter blocks found on Atmel AT91 SoCs.  The VT8500 driver now
  supports changing the PWM signal polarity and the TI drivers (EHRPWM
  and ECAP) gained suspend and resume functionality.

  User drivers can now query the core for whether access to a PWM device
  will sleep (if the PWM chip is on a slow bus such as I2C or SPI).

  The pwm-backlight driver now handles the backlight BL_CORE_FBBLANK
  state in addition to the FB layer's blanking states.

  To round things off, a few fixes and cleanups are also included"

* tag 'for-3.9-rc1' of git://gitorious.org/linux-pwm/linux-pwm:
  pwm: twl: Use to_twl() instead of container_of()
  pwm: tegra: assume CONFIG_OF
  pwm_backlight: Validate dft_brightness in main probe function
  pwm: Export pwm_{set,get}_chip_data()
  pwm: Make Kconfig entries more consistent
  pwm: Add can_sleep property to drivers
  pwm: Add pwm_can_sleep() as exported API to users
  pwm-backlight: handle BL_CORE_FBBLANK state
  pwm: pwm-tiecap: Low power sleep support
  pwm: pwm-tiehrpwm: Low power sleep support
  pwm: pwm-tiehrpwm: Update the clock handling of pwm-tiehrpwm driver
  pwm: vt8500: Add polarity support
  pwm: vt8500: Register write busy test performed incorrectly
  pwm: atmel: add Timer Counter Block PWM driver

1 files changed, 53 insertions, 0 deletions

diff --git a/drivers/pwm/pwm-tiecap.c b/drivers/pwm/pwm-tiecap.c
index 27a67d6b27c1..22e96e2bffd3 100644
--- a/drivers/pwm/pwm-tiecap.c
+++ b/drivers/pwm/pwm-tiecap.c
@@ -41,10 +41,17 @@
 #define ECCTL2_SYNC_SEL_DISA    (BIT(7) | BIT(6))
 #define ECCTL2_TSCTR_FREERUN    BIT(4)
 
+struct ecap_context {
+        u32     cap3;
+        u32     cap4;
+        u16     ecctl2;
+};
+
 struct ecap_pwm_chip {
         struct pwm_chip chip;
         unsigned int    clk_rate;
         void __iomem    *mmio_base;
+        struct ecap_context ctx;
 };
 
 static inline struct ecap_pwm_chip *to_ecap_pwm_chip(struct pwm_chip *chip)
@@ -288,11 +295,57 @@ static int ecap_pwm_remove(struct platform_device *pdev)
         return pwmchip_remove(&pc->chip);
 }
 
+void ecap_pwm_save_context(struct ecap_pwm_chip *pc)
+{
+        pm_runtime_get_sync(pc->chip.dev);
+        pc->ctx.ecctl2 = readw(pc->mmio_base + ECCTL2);
+        pc->ctx.cap4 = readl(pc->mmio_base + CAP4);
+        pc->ctx.cap3 = readl(pc->mmio_base + CAP3);
+        pm_runtime_put_sync(pc->chip.dev);
+}
+
+void ecap_pwm_restore_context(struct ecap_pwm_chip *pc)
+{
+        writel(pc->ctx.cap3, pc->mmio_base + CAP3);
+        writel(pc->ctx.cap4, pc->mmio_base + CAP4);
+        writew(pc->ctx.ecctl2, pc->mmio_base + ECCTL2);
+}
+
+static int ecap_pwm_suspend(struct device *dev)
+{
+        struct ecap_pwm_chip *pc = dev_get_drvdata(dev);
+        struct pwm_device *pwm = pc->chip.pwms;
+
+        ecap_pwm_save_context(pc);
+
+        /* Disable explicitly if PWM is running */
+        if (test_bit(PWMF_ENABLED, &pwm->flags))
+                pm_runtime_put_sync(dev);
+
+        return 0;
+}
+
+static int ecap_pwm_resume(struct device *dev)
+{
+        struct ecap_pwm_chip *pc = dev_get_drvdata(dev);
+        struct pwm_device *pwm = pc->chip.pwms;
+
+        /* Enable explicitly if PWM was running */
+        if (test_bit(PWMF_ENABLED, &pwm->flags))
+                pm_runtime_get_sync(dev);
+
+        ecap_pwm_restore_context(pc);
+        return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(ecap_pwm_pm_ops, ecap_pwm_suspend, ecap_pwm_resume);
+
 static struct platform_driver ecap_pwm_driver = {
         .driver = {
                 .name   = "ecap",
                 .owner  = THIS_MODULE,
                 .of_match_table = ecap_of_match,
+                .pm     = &ecap_pwm_pm_ops,
         },
         .probe = ecap_pwm_probe,
         .remove = ecap_pwm_remove,