linux-kernel - Re: [PATCH v6 1/2] drivers: watchdog: add a driver to support SAMA5D4 watchdog timer

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Message-ID: <55C4CDEB.9020505@roeck-us.net>
Date:	Fri, 07 Aug 2015 08:25:31 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Wenyou Yang <wenyou.yang@...el.com>, wim@...ana.be,
	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org
CC:	sylvain.rochet@...secur.com, nicolas.ferre@...el.com,
	boris.brezillon@...e-electrons.com, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org
Subject: Re: [PATCH v6 1/2] drivers: watchdog: add a driver to support SAMA5D4
 watchdog timer

On 08/06/2015 03:16 AM, Wenyou Yang wrote:
>>>From SAMA5D4, the watchdog timer is upgrated with a new feature,
> which is describled as in the datasheet, "WDT_MR can be written
> until a LOCKMR command is issued in WDT_CR".
> That is to say, as long as the bootstrap and u-boot don't issue
> a LOCKMR command, WDT_MR can be written more than once in the driver.
>
> So the SAMA5D4 watchdog driver's implementation is different from
> the at91sam9260 watchdog driver implemented in file at91sam9_wdt.c.
> The user application open the device file to enable the watchdog timer
> hardware, and close to disable it, and set the watchdog timer timeout
> by seting WDV and WDD fields of WDT_MR register, and ping the watchdog
> by issuing WDRSTT command to WDT_CR register with hard-coded key.
>
> Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>

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

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