linux-kernel - Re: [PATCH v2 2/7] watchdog: w83627hf: Enable watchdog only once

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Message-ID: <514B5431.8080608@draigBrady.com>
Date:	Thu, 21 Mar 2013 18:40:49 +0000
From:	Pádraig Brady <P@...igBrady.com>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	linux-watchdog@...r.kernel.org, Wim Van Sebroeck <wim@...ana.be>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/7] watchdog: w83627hf: Enable watchdog only once

On 03/19/2013 08:02 PM, Guenter Roeck wrote:
> On Tue, Mar 19, 2013 at 05:26:26PM +0000, Pádraig Brady wrote:
>> On 03/10/2013 11:14 PM, Guenter Roeck wrote:
>>> It is unnecessary to enable the logical device and WDT0 each time
>>> the watchdog is accessed. Do it only once during initialization.
>>
>> Is this also the case on systems where the superio
>> chip is used for other things? I've the impression
>> that this may break some systems (though I no longer
>> have the hardware to test). Arbitration of multiple
>> users of the superio device may be managed be a central
>> user space app, or by a kernel level arbitrator.
>>
> Not sure if I understand you correctly.
> 
> You mean some entity might actually disable the watchdog between accesses
> to it by the watchdog driver ? That would make it pretty useless.
> Might as well turn it off entirely if that is the case.
> 
> Or do you refer to _selecting_ the hwmon logical device ? If so, this patch
> is about enabling it only once, not about selecting it only once.

I meant selecting.
Enabling only once is fine.

sorry for the noise,

thanks,
Pádraig.
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