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


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