Re: [PATCH 3/7] watchdog: JZ4740: Register a restart handler

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On 12/28/2017 08:29 AM, Paul Cercueil wrote:
The watchdog driver can restart the system by simply configuring the
hardware for a timeout of 0 seconds.

Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>

Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>

---
  drivers/watchdog/jz4740_wdt.c | 9 +++++++++
  1 file changed, 9 insertions(+)

diff --git a/drivers/watchdog/jz4740_wdt.c b/drivers/watchdog/jz4740_wdt.c
index 92d6ca8ceb49..fa7f49a3212c 100644
--- a/drivers/watchdog/jz4740_wdt.c
+++ b/drivers/watchdog/jz4740_wdt.c
@@ -130,6 +130,14 @@ static int jz4740_wdt_stop(struct watchdog_device *wdt_dev)
  	return 0;
  }
+static int jz4740_wdt_restart(struct watchdog_device *wdt_dev,
+			      unsigned long action, void *data)
+{
+	wdt_dev->timeout = 0;
+	jz4740_wdt_start(wdt_dev);
+	return 0;
+}
+
  static const struct watchdog_info jz4740_wdt_info = {
  	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
  	.identity = "jz4740 Watchdog",
@@ -141,6 +149,7 @@ static const struct watchdog_ops jz4740_wdt_ops = {
  	.stop = jz4740_wdt_stop,
  	.ping = jz4740_wdt_ping,
  	.set_timeout = jz4740_wdt_set_timeout,
+	.restart = jz4740_wdt_restart,
  };
#ifdef CONFIG_OF


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