watchdog: da9063: Add restart handler support

Register a restart handler for the da9063 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.

The actual restart method was inspired by a platform-specific patch from
the BSP by Hisashi Nakamura <hisashi.nakamura.ak@renesas.com>.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Steve Twiss <stwiss.opensource@diasemi.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 31 insertions, 1 deletions

diff --git a/drivers/watchdog/da9063_wdt.c b/drivers/watchdog/da9063_wdt.c
index 2cd6b2c2dd2a..e2fe2ebdebd4 100644
--- a/drivers/watchdog/da9063_wdt.c
+++ b/drivers/watchdog/da9063_wdt.c
@@ -20,6 +20,7 @@
 #include <linux/delay.h>
 #include <linux/mfd/da9063/registers.h>
 #include <linux/mfd/da9063/core.h>
+#include <linux/reboot.h>
 #include <linux/regmap.h>
 
 /*
@@ -38,6 +39,7 @@ static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 };
 struct da9063_watchdog {
         struct da9063 *da9063;
         struct watchdog_device wdtdev;
+        struct notifier_block restart_handler;
 };
 
 static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs)
@@ -119,6 +121,23 @@ static int da9063_wdt_set_timeout(struct watchdog_device *wdd,
         return ret;
 }
 
+static int da9063_wdt_restart_handler(struct notifier_block *this,
+                                      unsigned long mode, void *cmd)
+{
+        struct da9063_watchdog *wdt = container_of(this,
+                                                   struct da9063_watchdog,
+                                                   restart_handler);
+        int ret;
+
+        ret = regmap_write(wdt->da9063->regmap, DA9063_REG_CONTROL_F,
+                           DA9063_SHUTDOWN);
+        if (ret)
+                dev_alert(wdt->da9063->dev, "Failed to shutdown (err = %d)\n",
+                          ret);
+
+        return NOTIFY_DONE;
+}
+
 static const struct watchdog_info da9063_watchdog_info = {
         .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
         .identity = "DA9063 Watchdog",
@@ -163,14 +182,25 @@ static int da9063_wdt_probe(struct platform_device *pdev)
         dev_set_drvdata(&pdev->dev, wdt);
 
         ret = watchdog_register_device(&wdt->wdtdev);
+        if (ret)
+                return ret;
 
-        return ret;
+        wdt->restart_handler.notifier_call = da9063_wdt_restart_handler;
+        wdt->restart_handler.priority = 128;
+        ret = register_restart_handler(&wdt->restart_handler);
+        if (ret)
+                dev_err(wdt->da9063->dev,
+                        "Failed to register restart handler (err = %d)\n", ret);
+
+        return 0;
 }
 
 static int da9063_wdt_remove(struct platform_device *pdev)
 {
         struct da9063_watchdog *wdt = dev_get_drvdata(&pdev->dev);
 
+        unregister_restart_handler(&wdt->restart_handler);
+
         watchdog_unregister_device(&wdt->wdtdev);
 
         return 0;