linux-kernel - Re: [PATCH v13 4/4] Watchdog: introduce ARM SBSA watchdog driver

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Date:	Tue, 16 Feb 2016 19:42:56 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	fu.wei@...aro.org, robh+dt@...nel.org, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, wim@...ana.be, corbet@....net,
	catalin.marinas@....com, will.deacon@....com,
	Suravee.Suthikulpanit@....com
Cc:	linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org,
	linux-doc@...r.kernel.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linaro-acpi@...ts.linaro.org,
	rruigrok@...eaurora.org, harba@...eaurora.org, cov@...eaurora.org,
	timur@...eaurora.org, dyoung@...hat.com, panand@...hat.com,
	graeme.gregory@...aro.org, al.stone@...aro.org,
	hanjun.guo@...aro.org, jcm@...hat.com, arnd@...db.de,
	leo.duran@....com, sudeep.holla@....com
Subject: Re: [PATCH v13 4/4] Watchdog: introduce ARM SBSA watchdog driver

On 02/16/2016 09:08 AM, fu.wei@...aro.org wrote:
> From: Fu Wei <fu.wei@...aro.org>
>
> According to Server Base System Architecture (SBSA) specification,
> the SBSA Generic Watchdog has two stage timeouts: the first signal (WS0)
> is for alerting the system by interrupt, the second one (WS1) is a real
> hardware reset.
> More details about the hardware specification of this device:
> ARM DEN0029B - Server Base System Architecture (SBSA)
>
> This driver can operate ARM SBSA Generic Watchdog as a single stage watchdog
> or a two stages watchdog, it's set up by the module parameter "action".
> In the single stage mode, when the timeout is reached, your system
> will be reset by WS1. The first signal (WS0) is ignored.
> In the two stages mode, when the timeout is reached, the first signal (WS0)
> will trigger panic. If the system is getting into trouble and cannot be reset
> by panic or restart properly by the kdump kernel(if supported), then the
> second stage (as long as the first stage) will be reached, system will be
> reset by WS1. This function can help administrator to backup the system
> context info by panic console output or kdump.
>
> This driver bases on linux kernel watchdog framework, so it can get
> timeout from module parameter and FDT at the driver init stage.
>
> Signed-off-by: Fu Wei <fu.wei@...aro.org>
> Reviewed-by: Graeme Gregory <graeme.gregory@...aro.org>
> Tested-by: Pratyush Anand <panand@...hat.com>
> Acked-by: Timur Tabi <timur@...eaurora.org>
> Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> Tested-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>

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