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

[Guenter Roeck <linux@roeck-us.net>]

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@crapouillou.net>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
>   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