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

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Message-ID: <20130319200209.GA16827@roeck-us.net>
Date:	Tue, 19 Mar 2013 13:02:09 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Pádraig Brady <P@...igBrady.com>
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 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.

Guenter
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