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Commit aefbaf3a authored by Xiubo Li's avatar Xiubo Li Committed by Wim Van Sebroeck
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watchdog: imx2_wdt: Add power management support. 



Add power management operations(suspend and resume) as part of
dev_pm_ops for IMX2 watchdog driver.

Signed-off-by: default avatarXiubo Li <Li.Xiubo@freescale.com>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent 44e8967d

drivers/watchdog/imx2_wdt.c

+47 −0
Original line number Diff line number Diff line
@@ -326,6 +326,52 @@ static void imx2_wdt_shutdown(struct platform_device *pdev) 
	}

}



#ifdef CONFIG_PM_SLEEP

/* Disable watchdog if it is active during suspend */

static int imx2_wdt_suspend(struct device *dev)

{

	struct watchdog_device *wdog = dev_get_drvdata(dev);

	struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);



	imx2_wdt_set_timeout(wdog, IMX2_WDT_MAX_TIME);

	imx2_wdt_ping(wdog);



	/* Watchdog has been stopped but IP block is still running */

	if (!watchdog_active(&wdog) && imx2_wdt_is_running(wdev))

		del_timer_sync(&wdev->timer);



	clk_disable_unprepare(wdev->clk);



	return 0;

}



/* Enable watchdog and configure it if necessary */

static int imx2_wdt_resume(struct device *dev)

{

	struct watchdog_device *wdog = dev_get_drvdata(dev);

	struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);



	clk_prepare_enable(wdev->clk);



	if (watchdog_active(wdog) && !imx2_wdt_is_running(wdev)) {

		/* Resumes from deep sleep we need restart

		 * the watchdog again.

		 */

		imx2_wdt_setup(wdog);

		imx2_wdt_set_timeout(wdog, wdog->timeout);

		imx2_wdt_ping(wdog);

	} else if (imx2_wdt_is_running(wdev)) {

		imx2_wdt_ping(wdog);

		mod_timer(&wdev->timer, jiffies + wdog->timeout * HZ / 2);

	}



	return 0;

}

#endif



static SIMPLE_DEV_PM_OPS(imx2_wdt_pm_ops, imx2_wdt_suspend,

			 imx2_wdt_resume);



static const struct of_device_id imx2_wdt_dt_ids[] = {

	{ .compatible = "fsl,imx21-wdt", },

	{ /* sentinel */ }
@@ -337,6 +383,7 @@ static struct platform_driver imx2_wdt_driver = { 
	.shutdown	= imx2_wdt_shutdown,

	.driver		= {

		.name	= DRIVER_NAME,

		.pm     = &imx2_wdt_pm_ops,

		.of_match_table = imx2_wdt_dt_ids,

	},

};