linux-kernel - Re: [PATCH v4 1/2] watchdog: New watchdog driver for MEN A21 watchdogs

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Message-ID: <20130528162218.GA22351@roeck-us.net>
Date:	Tue, 28 May 2013 09:22:18 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Johannes Thumshirn <johannes.thumshirn@....de>
Cc:	Wim Van Sebroeck <wim@...ana.be>, linux-watchdog@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/2] watchdog: New watchdog driver for MEN A21
 watchdogs

On Tue, May 28, 2013 at 10:10:53AM +0200, Johannes Thumshirn wrote:
> On Mon, May 27, 2013 at 08:25:54PM +0200, Wim Van Sebroeck wrote:
> [...]
> > > +	watchdog_set_drvdata(&a21_wdt, drv);
> >
> > I am missing the initialisation of the watchdog's timeout value here...
> 
> This watchdog only knows two timeout values, 1s and 30s with the constraint
> that you can't go back to 30s once your in a 1s timeout without a reset of the
> CPLD. I could initially set it to 30s but that would be redundant.
> 
I wonder - why bother with supporting one-second timeouts ?

Is this realistic, ie can you guarantee that the watchdog will be pinged fast
enough to keep the system alive under all load conditions ? As far as I know
you can not even configure the watchdog application for less than 1 second
ping intervals.

Thanks,
Guenter
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