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watchdog: sama5d4: Implement resume hook 

When resuming for the deepest state on sama5d2, it is necessary to restore
MR as the registers are lost.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Alexandre Belloni 2017-01-30 18:18:48 +01:00 committed by Guenter Roeck
parent 722ce6356d
commit f201353273
1 changed files with 17 additions and 0 deletions
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17
drivers/watchdog/sama5d4_wdt.c
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@ -258,11 +258,28 @@ static const struct of_device_id sama5d4_wdt_of_match[] = {
};
MODULE_DEVICE_TABLE(of, sama5d4_wdt_of_match);
#ifdef CONFIG_PM_SLEEP
static int sama5d4_wdt_resume(struct device *dev)
{
struct sama5d4_wdt *wdt = dev_get_drvdata(dev);
wdt_write(wdt, AT91_WDT_MR, wdt->mr & ~AT91_WDT_WDDIS);
if (wdt->mr & AT91_WDT_WDDIS)
wdt_write(wdt, AT91_WDT_MR, wdt->mr);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(sama5d4_wdt_pm_ops, NULL,
sama5d4_wdt_resume);
static struct platform_driver sama5d4_wdt_driver = {
.probe = sama5d4_wdt_probe,
.remove = sama5d4_wdt_remove,
.driver = {
.name = "sama5d4_wdt",
.pm = &sama5d4_wdt_pm_ops,
.of_match_table = sama5d4_wdt_of_match,
}
};