watchdog: da9062: Add restart handler support

Web:        https://git.kernel.org/torvalds/c/540f635192bb222f252724f70b9240d17742f1b1
Commit:     540f635192bb222f252724f70b9240d17742f1b1
Parent:     d5433fd60df0d77b4751715e22a2dd715d26d926
Refname:    refs/heads/master
Author:     Michael Grzeschik <[email protected]>
AuthorDate: Tue Oct 17 17:30:22 2017 +0200
Committer:  Wim Van Sebroeck <[email protected]>
CommitDate: Thu Dec 28 20:45:07 2017 +0100

    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 <[email protected]>
    Reviewed-by: Guenter Roeck <[email protected]>
    Signed-off-by: Guenter Roeck <[email protected]>
    Signed-off-by: Wim Van Sebroeck <[email protected]>
---
 drivers/watchdog/da9062_wdt.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/watchdog/da9062_wdt.c b/drivers/watchdog/da9062_wdt.c
index 9083d3d922b0..4349a0221548 100644
--- a/drivers/watchdog/da9062_wdt.c
+++ b/drivers/watchdog/da9062_wdt.c
@@ -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);
--
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