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pwm: atmel-hlcdc: Implement the suspend/resume hooks

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Implement the suspend/resume hooks to make sure the PWM device is
restored to a correct state after a suspend.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Boris Brezillon 2017-03-01 15:52:27 +01:00 committed by Thierry Reding
parent 2267517cd3
commit f9bb9da7c0
1 changed files with 35 additions and 0 deletions
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35
drivers/pwm/pwm-atmel-hlcdc.c
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@ -191,6 +191,40 @@ static const struct atmel_hlcdc_pwm_errata atmel_hlcdc_pwm_sama5d3_errata = {
.div1_clk_erratum = true,
};
#ifdef CONFIG_PM_SLEEP
static int atmel_hlcdc_pwm_suspend(struct device *dev)
{
struct atmel_hlcdc_pwm *chip = dev_get_drvdata(dev);
/* Keep the periph clock enabled if the PWM is still running. */
if (pwm_is_enabled(&chip->chip.pwms[0]))
clk_disable_unprepare(chip->hlcdc->periph_clk);
return 0;
}
static int atmel_hlcdc_pwm_resume(struct device *dev)
{
struct atmel_hlcdc_pwm *chip = dev_get_drvdata(dev);
struct pwm_state state;
int ret;
pwm_get_state(&chip->chip.pwms[0], &state);
/* Re-enable the periph clock it was stopped during suspend. */
if (!state.enabled) {
ret = clk_prepare_enable(chip->hlcdc->periph_clk);
if (ret)
return ret;
}
return atmel_hlcdc_pwm_apply(&chip->chip, &chip->chip.pwms[0], &state);
}
#endif
static SIMPLE_DEV_PM_OPS(atmel_hlcdc_pwm_pm_ops,
atmel_hlcdc_pwm_suspend, atmel_hlcdc_pwm_resume);
static const struct of_device_id atmel_hlcdc_dt_ids[] = {
{
.compatible = "atmel,at91sam9n12-hlcdc",
@ -280,6 +314,7 @@ static struct platform_driver atmel_hlcdc_pwm_driver = {
.driver = {
.name = "atmel-hlcdc-pwm",
.of_match_table = atmel_hlcdc_pwm_dt_ids,
.pm = &atmel_hlcdc_pwm_pm_ops,
},
.probe = atmel_hlcdc_pwm_probe,
.remove = atmel_hlcdc_pwm_remove,