On 01/19/2018 11:31 PM, PrasannaKumar Muralidharan wrote:
Hi Paul, On 30 December 2017 at 19:21, Paul Cercueil <paul@xxxxxxxxxxxxxxx> 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(+) v2: No change 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 -- 2.11.0Noticed that min_timeout of the watchdog device is set to 1 but this function calls start with timeout set to 0. Even though this works I feel it is better to set min_timeout to 0.
No. That would be wrong. If you want to be pedantic, write a new function __jz4740_wdt_set_timeout(u16 clock_div, u16 timeout_value) and call it instead, but don't mess with min_timeout. Guenter
