linux-kernel - Re: [PATCH v3] watchdog: sp805: add restart handler

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Date:   Wed, 9 May 2018 11:40:19 +0900
From:   Jongsung Kim <neidhard.kim@....com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Chanho Min <chanho.min@....com>
Subject: Re: [PATCH v3] watchdog: sp805: add restart handler

On 05/04/2018 10:11 PM, Guenter Roeck wrote:
> On 05/03/2018 11:05 PM, Jongsung Kim wrote:
>> Add restart handler for SP805 watchdog so that the driver can be
>> used to reboot the system.
>>
>> Signed-off-by: Jongsung Kim <neidhard.kim@....com>
>> Cc: Guenter Roeck <linux@...ck-us.net>
>
> Reviewed-by: Guenter Roeck <linux@...ck-us.net>
>
>> ---
>
> For future patches: change log goes here, please.
>
> Thanks,
> Guenter

Thank you for your review and kind comments.
JS

>
>>   drivers/watchdog/sp805_wdt.c | 14 ++++++++++++++
>>   1 file changed, 14 insertions(+)
>>
>> diff --git a/drivers/watchdog/sp805_wdt.c b/drivers/watchdog/sp805_wdt.c
>> index 03805bc..9849db0 100644
>> --- a/drivers/watchdog/sp805_wdt.c
>> +++ b/drivers/watchdog/sp805_wdt.c
>> @@ -121,6 +121,18 @@ static unsigned int wdt_timeleft(struct watchdog_device *wdd)
>>       return div_u64(load, rate);
>>   }
>>   +static int
>> +wdt_restart(struct watchdog_device *wdd, unsigned long mode, void *cmd)
>> +{
>> +    struct sp805_wdt *wdt = watchdog_get_drvdata(wdd);
>> +
>> +    writel_relaxed(0, wdt->base + WDTCONTROL);
>> +    writel_relaxed(0, wdt->base + WDTLOAD);
>> +    writel_relaxed(INT_ENABLE | RESET_ENABLE, wdt->base + WDTCONTROL);
>> +
>> +    return 0;
>> +}
>> +
>>   static int wdt_config(struct watchdog_device *wdd, bool ping)
>>   {
>>       struct sp805_wdt *wdt = watchdog_get_drvdata(wdd);
>> @@ -197,6 +209,7 @@ static const struct watchdog_ops wdt_ops = {
>>       .ping        = wdt_ping,
>>       .set_timeout    = wdt_setload,
>>       .get_timeleft    = wdt_timeleft,
>> +    .restart    = wdt_restart,
>>   };
>>     static int
>> @@ -230,6 +243,7 @@ sp805_wdt_probe(struct amba_device *adev, const struct amba_id *id)
>>       spin_lock_init(&wdt->lock);
>>       watchdog_set_nowayout(&wdt->wdd, nowayout);
>>       watchdog_set_drvdata(&wdt->wdd, wdt);
>> +    watchdog_set_restart_priority(&wdt->wdd, 128);
>>       wdt_setload(&wdt->wdd, DEFAULT_TIMEOUT);
>>         ret = watchdog_register_device(&wdt->wdd);
>>
>
>