linux-kernel - Re: [PATCH] Add support for always enabled watchdog timers

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Date:	Sat, 06 Sep 2014 20:49:14 +0400
From:	Evgeny Boger <boger@...tactless.ru>
To:	Guenter Roeck <linux@...ck-us.net>,
	Alexander Shiyan <shc_work@...l.ru>
CC:	linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Add support for always enabled watchdog timers

On 08/23/2014 09:33 PM, Guenter Roeck wrote:
> On 08/23/2014 10:25 AM, Alexander Shiyan wrote:
>> Sat, 23 Aug 2014 10:16:08 -0700 от Guenter Roeck <linux@...ck-us.net>:
>>> On 08/16/2014 05:45 PM, Evgeny Boger wrote:
>>>> From: Evgeny Boger <boger@...tactless.ru>
>>>>
>>>> Add option to use with watchdog timers which are always enabled
>>>> in hardware, i.e. there is no way to enable/disable it via GPIO pin.
>>>> The driver will start pinging WDT immediately upon loading
>>>> and will continue to do so even after stopping the watchdog.
>>>>
>>> The headline needs a reference to the affected driver.
>>>
>>> Also, please copy the dt mailing list and maintainers.
>>>
>>>> Signed-off-by: Evgeny Boger <boger@...tactless.ru>
>>>> ---
>>>>    .../devicetree/bindings/watchdog/gpio-wdt.txt      | 14 ++++++-
>>>>    drivers/watchdog/gpio_wdt.c                        | 45 
>>>> +++++++++++++++++-----
>>>>    2 files changed, 48 insertions(+), 11 deletions(-)
>>>>
>>>> diff --git 
>>>> a/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt 
>>>> b/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt
>>>> index 37afec1..1f8ca46 100644
>>>> --- a/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt
>>>> +++ b/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt
>>>> @@ -12,8 +12,11 @@ Required Properties:
>>>>        the opposite level disables the WDT. Active level is determined
>>>>        by the GPIO flags.
>>>>    - hw_margin_ms: Maximum time to reset watchdog circuit 
>>>> (milliseconds).
>>>> +- always-enabled: Use with wathdog timer which is always enabled
>>
>> Similar to NOWAYOUT?
>>
> I think this one is different. NOWAYOUT is a software flag, while
> the flag here is supposed to mean that the hardware watchdog
> is always enabled and running, and can not be disabled. Or at least
> this is my understanding.

exactly

>
> Guenter
>


-- 
С уважением,
     Евгений Богер
     ООО Бесконтактные устройства
     http://contactless.ru
     +7 (919) 965 88 36

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