linux-kernel - Re: [PATCH 1/6] watchdog: davinci: change driver to use WDT core

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Message-ID: <528B8F1C.3090506@ti.com>
Date:	Tue, 19 Nov 2013 18:17:32 +0200
From:	Grygorii Strashko <grygorii.strashko@...com>
To:	Guenter Roeck <linux@...ck-us.net>,
	Ivan Khoronzhuk <ivan.khoronzhuk@...com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Wim Van Sebroeck <wim@...ana.be>,
	Sekhar Nori <nsekhar@...com>, <linux-watchdog@...r.kernel.org>,
	<devicetree@...r.kernel.org>
CC:	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Kumar Gala <galak@...nel.crashing.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/6] watchdog: davinci: change driver to use WDT core

On 11/19/2013 07:12 AM, Guenter Roeck wrote:
> On 11/18/2013 09:18 AM, Ivan Khoronzhuk wrote:
>> To reduce code duplicate and increase code readability use WDT core
>> code to handle WDT interface.
>>
>> Remove io_lock as the WDT core uses mutex to lock each wdt device.
>> Remove wdt_state as the WDT core track state with its own variable.
>>
>> The watchdog_init_timeout() can read timeout value from timeout-sec
>> property if the passed value is out of bounds. The heartbeat is
>> initialized in next way. If heartbeat is not set thought module
>> parameter, try to read it's value from WDT node timeout-sec property.
>> If node has no one, use default value.
>>
>> The heartbeat is hold in wdd->timeout by WDT core, so use it in
>> order to set timeout period.
>>
>> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...com>
>> Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>
>> ---
>>   drivers/watchdog/Kconfig       |    2 +
>>   drivers/watchdog/davinci_wdt.c |  152
>> ++++++++++------------------------------
>>   2 files changed, 39 insertions(+), 115 deletions(-)
>>
>> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
>> index d1d53f3..d7db13d 100644
>> --- a/drivers/watchdog/Kconfig
>> +++ b/drivers/watchdog/Kconfig
>> @@ -271,6 +271,8 @@ config IOP_WATCHDOG
>>   config DAVINCI_WATCHDOG
>>       tristate "DaVinci watchdog"
>>       depends on ARCH_DAVINCI
>> +    select WATCHDOG_CORE
>> +    select WATCHDOG_NOWAYOUT
>
> Is this mandatory, ie is it correct that the watchdog can not be stopped
> once started ?
>
> Assuming it is,

Yes, it is. Davinci WDT can't be stopped and once it's expired - it can 
be rearmed only after hardware reset.

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

Thanks a lot for your review.

Regards,
-grygorii


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