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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: Xiubo Li <Li.Xiubo@freescale.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Xiubo Li 2014-09-22 18:00:52 +08:00 committed by Wim Van Sebroeck
parent 44e8967d59
commit aefbaf3a3f
1 changed files with 47 additions and 0 deletions
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47
drivers/watchdog/imx2_wdt.c
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@ -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,
},
};