linux-kernel - Re: [PATCH v10 4/5] Watchdog: introduce ARM SBSA watchdog driver

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Date:	Thu, 4 Feb 2016 16:31:02 +0000
From:	Will Deacon <will.deacon@....com>
To:	fu.wei@...aro.org
Cc:	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org, wim@...ana.be,
	linux@...ck-us.net, corbet@....net, catalin.marinas@....com,
	Suravee.Suthikulpanit@....com, 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 v10 4/5] Watchdog: introduce ARM SBSA watchdog driver

On Thu, Feb 04, 2016 at 01:18:42AM +0800, fu.wei@...aro.org wrote:
> +static int sbsa_gwdt_keepalive(struct watchdog_device *wdd)
> +{
> +	struct sbsa_gwdt *gwdt = to_sbsa_gwdt(wdd);
> +
> +	/*
> +	* Writing WRR for an explicit watchdog refresh.
> +	* You can write anyting(like 0xc0ffee).
> +	*/
> +	writel(0xc0ffee, gwdt->refresh_base + SBSA_GWDT_WRR);
> +
> +	return 0;
> +}

You might get in trouble for that. 0xd09f00d is probably less poisonous.

http://www.petpoisonhelpline.com/poison/caffeine/

Will