pwm: bcm2835: Add support for suspend/resume

Similar to other drivers, we need to make sure that the clock is
disabled during suspend and re-enabled during resume.

Reported-by: Angus Clark <angus.clark@broadcom.com>
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

diff --git a/drivers/pwm/pwm-bcm2835.c b/drivers/pwm/pwm-bcm2835.c
index 8c69ddfea2d0fb9b4756c8116e5cb2cd69249c47..9777babd5b95cd9fc3a4388745840ab1a7e2bbdc 100644 (file)
--- a/drivers/pwm/pwm-bcm2835.c
+++ b/drivers/pwm/pwm-bcm2835.c
@@ -163,6 +163,25 @@ static int bcm2835_pwm_probe(struct platform_device *pdev)
        return 0;
 }
 
+static int bcm2835_pwm_suspend(struct device *dev)
+{
+       struct bcm2835_pwm *pc = dev_get_drvdata(dev);
+
+       clk_disable_unprepare(pc->clk);
+
+       return 0;
+}
+
+static int bcm2835_pwm_resume(struct device *dev)
+{
+       struct bcm2835_pwm *pc = dev_get_drvdata(dev);
+
+       return clk_prepare_enable(pc->clk);
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(bcm2835_pwm_pm_ops, bcm2835_pwm_suspend,
+                               bcm2835_pwm_resume);
+
 static const struct of_device_id bcm2835_pwm_of_match[] = {
        { .compatible = "brcm,bcm2835-pwm", },
        { /* sentinel */ }
@@ -173,6 +192,7 @@ static struct platform_driver bcm2835_pwm_driver = {
        .driver = {
                .name = "bcm2835-pwm",
                .of_match_table = bcm2835_pwm_of_match,
+               .pm = pm_ptr(&bcm2835_pwm_pm_ops),
        },
        .probe = bcm2835_pwm_probe,
 };