linux-kernel - Re: [PATCH 6/6] watchdog: sama5d4: try to set timeout from device tree first

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Message-ID: <20151012090930.GA747@gradator.net>
Date:	Mon, 12 Oct 2015 11:09:30 +0200
From:	Sylvain Rochet <sylvain.rochet@...secur.com>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Guenter Roeck <linux@...ck-us.net>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	linux-kernel@...r.kernel.org,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	linux-arm-kernel@...ts.infradead.org,
	Wenyou Yang <wenyou.yang@...el.com>,
	Wim Van Sebroeck <wim@...ana.be>
Subject: Re: [PATCH 6/6] watchdog: sama5d4: try to set timeout from device
 tree first

Hi Alexandre,

On Mon, Oct 12, 2015 at 09:50:01AM +0200, Alexandre Belloni wrote:
> Hi Sylvain,
> 
> The rest of the series looks good to me, one comment below:
> 
> On 08/10/2015 at 23:34:34 +0200, Sylvain Rochet wrote :
> > watchdog_init_timeout function doesn't try to get the "timeout-sec" DT
> > property if timeout_parm is not zero. This change makes this DT property
> > working for the sama5d4 watchdog driver.
> 
> While I'm not sure of the feasibility, I think that the module parameter
> should override the DT property.

That's not that hard, we can remove the initialisation of wdt_timeout to 
WDT_DEFAULT_TIMEOUT and use the 0 magic value, which is not an 
acceptable timeout value, to tell whether the variable was set with a 
module parameter or not.

I followed what was done in the at91sam9_wdt driver but I agree the 
module parameter should override the DT property, if we all agree on 
that, I will also change this behavior in at91sam9_wdt in v2, at least 
for the sake of coherency between drivers.

Sylvain
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