| Message ID | 20231009204226.3224521-1-florian.fainelli@broadcom.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] pwm: bcm2835: Add support for suspend/resume | expand |
On Mon, Oct 09, 2023 at 01:42:26PM -0700, Florian Fainelli wrote: > 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> > --- > Changes in v2: > > - use DEFINE_SIMPLE_DEV_PM_OPS as suggested by Uwe > > drivers/pwm/pwm-bcm2835.c | 20 ++++++++++++++++++++ > 1 file changed, 20 insertions(+) > > diff --git a/drivers/pwm/pwm-bcm2835.c b/drivers/pwm/pwm-bcm2835.c > index bdfc2a5ec0d6..938f993ae746 100644 > --- a/drivers/pwm/pwm-bcm2835.c > +++ b/drivers/pwm/pwm-bcm2835.c > @@ -182,6 +182,25 @@ static void bcm2835_pwm_remove(struct platform_device *pdev) > clk_disable_unprepare(pc->clk); > } > > +static int __maybe_unused bcm2835_pwm_suspend(struct device *dev) > +{ > + struct bcm2835_pwm *pc = dev_get_drvdata(dev); > + > + clk_disable_unprepare(pc->clk); > + > + return 0; > +} > + > +static int __maybe_unused bcm2835_pwm_resume(struct device *dev) With DEFINE_SIMPLE_DEV_PM_OPS you don't need the __maybe_unused (which is one of the upsides of DEFINE_SIMPLE_DEV_PM_OPS compared to SIMPLE_DEV_PM_OPS) > +{ > + 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 */ } > @@ -192,6 +211,7 @@ static struct platform_driver bcm2835_pwm_driver = { > .driver = { > .name = "bcm2835-pwm", > .of_match_table = bcm2835_pwm_of_match, > + .pm = &bcm2835_pwm_pm_ops, I think + .pm = pm_ptr(&bcm2835_pwm_pm_ops), is the right thing here. Best regards Uwe
diff --git a/drivers/pwm/pwm-bcm2835.c b/drivers/pwm/pwm-bcm2835.c index bdfc2a5ec0d6..938f993ae746 100644 --- a/drivers/pwm/pwm-bcm2835.c +++ b/drivers/pwm/pwm-bcm2835.c @@ -182,6 +182,25 @@ static void bcm2835_pwm_remove(struct platform_device *pdev) clk_disable_unprepare(pc->clk); } +static int __maybe_unused bcm2835_pwm_suspend(struct device *dev) +{ + struct bcm2835_pwm *pc = dev_get_drvdata(dev); + + clk_disable_unprepare(pc->clk); + + return 0; +} + +static int __maybe_unused 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 */ } @@ -192,6 +211,7 @@ static struct platform_driver bcm2835_pwm_driver = { .driver = { .name = "bcm2835-pwm", .of_match_table = bcm2835_pwm_of_match, + .pm = &bcm2835_pwm_pm_ops, }, .probe = bcm2835_pwm_probe, .remove_new = bcm2835_pwm_remove,
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> --- Changes in v2: - use DEFINE_SIMPLE_DEV_PM_OPS as suggested by Uwe drivers/pwm/pwm-bcm2835.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)