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Commit 97d0b42e authored by Xiubo Li's avatar Xiubo Li Committed by Thierry Reding
Browse files

pwm: ftm: Add Power Management support for FTM PWM 



Add PM support for FTM PWM driver using callback function suspend
and resume in .driver.pm of platform_driver.

Signed-off-by: default avatarXiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: default avatarThierry Reding <thierry.reding@gmail.com>
parent 49599cf6

drivers/pwm/pwm-fsl-ftm.c

+48 −1
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
#include <linux/mutex.h>

#include <linux/of_address.h>

#include <linux/platform_device.h>

#include <linux/pm.h>

#include <linux/pwm.h>

#include <linux/regmap.h>

#include <linux/slab.h>
@@ -436,7 +437,7 @@ static int fsl_pwm_probe(struct platform_device *pdev) 
	if (IS_ERR(base))

		return PTR_ERR(base);



	fpc->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,

	fpc->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "ftm_sys", base,

						&fsl_pwm_regmap_config);

	if (IS_ERR(fpc->regmap)) {

		dev_err(&pdev->dev, "regmap init failed\n");
@@ -487,6 +488,51 @@ static int fsl_pwm_remove(struct platform_device *pdev) 
	return pwmchip_remove(&fpc->chip);

}



#ifdef CONFIG_PM_SLEEP

static int fsl_pwm_suspend(struct device *dev)

{

	struct fsl_pwm_chip *fpc = dev_get_drvdata(dev);

	u32 val;



	regcache_cache_only(fpc->regmap, true);

	regcache_mark_dirty(fpc->regmap);



	/* read from cache */

	regmap_read(fpc->regmap, FTM_OUTMASK, &val);

	if ((val & 0xFF) != 0xFF) {

		clk_disable_unprepare(fpc->clk[FSL_PWM_CLK_CNTEN]);

		clk_disable_unprepare(fpc->clk[fpc->cnt_select]);

		clk_disable_unprepare(fpc->clk[FSL_PWM_CLK_SYS]);

	}



	return 0;

}



static int fsl_pwm_resume(struct device *dev)

{

	struct fsl_pwm_chip *fpc = dev_get_drvdata(dev);

	u32 val;



	/* read from cache */

	regmap_read(fpc->regmap, FTM_OUTMASK, &val);

	if ((val & 0xFF) != 0xFF) {

		clk_prepare_enable(fpc->clk[FSL_PWM_CLK_SYS]);

		clk_prepare_enable(fpc->clk[fpc->cnt_select]);

		clk_prepare_enable(fpc->clk[FSL_PWM_CLK_CNTEN]);

	}



	/* restore all registers from cache */

	regcache_cache_only(fpc->regmap, false);

	regcache_sync(fpc->regmap);



	return 0;

}

#endif



static const struct dev_pm_ops fsl_pwm_pm_ops = {

	SET_SYSTEM_SLEEP_PM_OPS(fsl_pwm_suspend, fsl_pwm_resume)

};



static const struct of_device_id fsl_pwm_dt_ids[] = {

	{ .compatible = "fsl,vf610-ftm-pwm", },

	{ /* sentinel */ }
@@ -497,6 +543,7 @@ static struct platform_driver fsl_pwm_driver = { 
	.driver = {

		.name = "fsl-ftm-pwm",

		.of_match_table = fsl_pwm_dt_ids,

		.pm = &fsl_pwm_pm_ops,

	},

	.probe = fsl_pwm_probe,

	.remove = fsl_pwm_remove,