[RFC PATCH 4/6] watchdog: moxart: Register restart handler with restart notifier

[Guenter Roeck]

The kernel now provides an API to trigger a system restart.
Register with it instead of setting arm_pm_restart.

Signed-off-by: Guenter Roeck <linux at roeck-us.net>
---
 drivers/watchdog/moxart_wdt.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/watchdog/moxart_wdt.c b/drivers/watchdog/moxart_wdt.c
index 4aa3a8a..9a862bf 100644
--- a/drivers/watchdog/moxart_wdt.c
+++ b/drivers/watchdog/moxart_wdt.c
@@ -15,12 +15,12 @@
 #include <linux/module.h>
 #include <linux/err.h>
 #include <linux/kernel.h>
+#include <linux/notifier.h>
 #include <linux/platform_device.h>
+#include <linux/reboot.h>
 #include <linux/watchdog.h>
 #include <linux/moduleparam.h>
 
-#include <asm/system_misc.h>
-
 #define REG_COUNT			0x4
 #define REG_MODE			0x8
 #define REG_ENABLE			0xC
@@ -35,13 +35,20 @@ static struct moxart_wdt_dev *moxart_restart_ctx;
 
 static int heartbeat;
 
-static void moxart_wdt_restart(enum reboot_mode reboot_mode, const char *cmd)
+static int moxart_restart_notify(struct notifier_block *this, unsigned long mode,
+				 void *cmd)
 {
 	writel(1, moxart_restart_ctx->base + REG_COUNT);
 	writel(0x5ab9, moxart_restart_ctx->base + REG_MODE);
 	writel(0x03, moxart_restart_ctx->base + REG_ENABLE);
+
+	return NOTIFY_DONE;
 }
 
+static struct notifier_block moxart_restart_notifier = {
+	.notifier_call = moxart_restart_notify,
+};
+
 static int moxart_wdt_stop(struct watchdog_device *wdt_dev)
 {
 	struct moxart_wdt_dev *moxart_wdt = watchdog_get_drvdata(wdt_dev);
@@ -137,7 +144,9 @@ static int moxart_wdt_probe(struct platform_device *pdev)
 		return err;
 
 	moxart_restart_ctx = moxart_wdt;
-	arm_pm_restart = moxart_wdt_restart;
+	err = register_restart_notifier(&moxart_restart_notifier);
+	if (err)
+		dev_err(dev, "cannot register reset notifier (err=%d)\n", err);
 
 	dev_dbg(dev, "Watchdog enabled (heartbeat=%d sec, nowayout=%d)\n",
 		moxart_wdt->dev.timeout, nowayout);
@@ -149,9 +158,8 @@ static int moxart_wdt_remove(struct platform_device *pdev)
 {
 	struct moxart_wdt_dev *moxart_wdt = platform_get_drvdata(pdev);
 
-	arm_pm_restart = NULL;
+	unregister_restart_notifier(&moxart_restart_notifier);
 	moxart_wdt_stop(&moxart_wdt->dev);
-	watchdog_unregister_device(&moxart_wdt->dev);
 
 	return 0;
 }
-- 
1.9.1