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Commit f9bb9da7 authored by Boris Brezillon's avatar Boris Brezillon Committed by Thierry Reding
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pwm: atmel-hlcdc: Implement the suspend/resume hooks 



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

Signed-off-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: default avatarThierry Reding <thierry.reding@gmail.com>
parent 2267517c

drivers/pwm/pwm-atmel-hlcdc.c

+35 −0
Original line number Diff line number Diff line
@@ -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,