linux-kernel - Re: [PATCH v2 1/2] watchdog: Add driver for Mediatek watchdog

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Date:	Mon, 15 Dec 2014 11:37:31 +0800
From:	Eddie Huang <eddie.huang@...iatek.com>
To:	Matthias Brugger <matthias.bgg@...il.com>
CC:	<wim@...ana.be>, <robh+dt@...nel.org>, <pawel.moll@....com>,
	<mark.rutland@....com>, <ijc+devicetree@...lion.org.uk>,
	<galak@...eaurora.org>, <grant.likely@...aro.org>,
	<heiko@...ech.de>, <yingjoe.chen@...il.com>,
	<linux-kernel@...r.kernel.org>, <ibanezchen@...il.com>,
	<greta.zhang@...iatek.com>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-watchdog@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] watchdog: Add driver for Mediatek watchdog

Hi,

On Fri, 2014-12-12 at 15:50 +0100, Matthias Brugger wrote:
> This patch adds a driver for the Mediatek SoC integrated
> watchdog. This driver supports watchdog and software reset
> for mt65xx and mt81xx SoCs.
> 
> Signed-off-by: Matthias Brugger <matthias.bgg@...il.com>

> +static int mtk_reset_handler(struct notifier_block *this, unsigned long mode,
> +				void *cmd)
> +{
> +	struct mtk_wdt_dev *mtk_wdt = container_of(this,
> +						       struct mtk_wdt_dev,
> +						       restart_handler);
> +	void __iomem *wdt_base = mtk_wdt->wdt_base;
> +	u32 reg;
> +
> +	/* Reset system */
> +	writel(WDT_SWRST_KEY, wdt_base + WDT_SWRST);
> +
> +	while (1) {
> +		mdelay(5);
> +		writel(WDT_SWRST_KEY, wdt_base + WDT_SWRST);
> +	}
> +	return NOTIFY_DONE;
> +
> +}

Build warning
../drivers/watchdog/mtk_wdt.c:78:6: warning: unused variable
'reg' [-Wunused-variable]

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