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watchdog: da9062: Add restart handler support 

Register a restart handler for the da9062 watchdog.  System restart is
triggered by sending the shutdown command to the PMIC.
As more-suitable restart handlers may exist, the priority of the
watchdog restart handler is set to 128.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Michael Grzeschik 2017-10-17 17:30:22 +02:00 committed by Wim Van Sebroeck
parent d5433fd60d
commit 540f635192
1 changed files with 22 additions and 0 deletions
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22
drivers/watchdog/da9062_wdt.c
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@ -175,6 +175,25 @@ static int da9062_wdt_set_timeout(struct watchdog_device *wdd,
return ret;
}
static int da9062_wdt_restart(struct watchdog_device *wdd, unsigned long action,
void *data)
{
struct da9062_watchdog *wdt = watchdog_get_drvdata(wdd);
int ret;
ret = regmap_write(wdt->hw->regmap,
DA9062AA_CONTROL_F,
DA9062AA_SHUTDOWN_MASK);
if (ret)
dev_alert(wdt->hw->dev, "Failed to shutdown (err = %d)\n",
ret);
/* wait for reset to assert... */
mdelay(500);
return ret;
}
static const struct watchdog_info da9062_watchdog_info = {
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
.identity = "DA9062 WDT",
@ -186,6 +205,7 @@ static const struct watchdog_ops da9062_watchdog_ops = {
.stop = da9062_wdt_stop,
.ping = da9062_wdt_ping,
.set_timeout = da9062_wdt_set_timeout,
.restart = da9062_wdt_restart,
};
static const struct of_device_id da9062_compatible_id_table[] = {
@ -219,6 +239,8 @@ static int da9062_wdt_probe(struct platform_device *pdev)
wdt->wdtdev.status = WATCHDOG_NOWAYOUT_INIT_STATUS;
wdt->wdtdev.parent = &pdev->dev;
watchdog_set_restart_priority(&wdt->wdtdev, 128);
watchdog_set_drvdata(&wdt->wdtdev, wdt);
ret = devm_watchdog_register_device(&pdev->dev, &wdt->wdtdev);