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| author | Xiubo Li <Li.Xiubo@freescale.com> | 2014-09-22 14:00:52 +0400 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2014-12-18 18:01:14 +0300 |
| commit | aefbaf3a3fa030ed7ef3cc9456ed82e6611c1dcb (patch) | |
| tree | bf8ce53c22151c69efb03f333b81becc7b6220d6 | |
| parent | 44e8967d591686463e84a88b46b03beba3ab49fb (diff) | |
| download | linux-aefbaf3a3fa030ed7ef3cc9456ed82e6611c1dcb.tar.xz | |
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>
| -rw-r--r-- | drivers/watchdog/imx2_wdt.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c index 65b84d8c0b93..51d940beb311 100644 --- a/drivers/watchdog/imx2_wdt.c +++ b/drivers/watchdog/imx2_wdt.c @@ -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, }, }; |