linux-kernel - Re: [v2,1/2] watchdog: mtk: add disable_wdt

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Date:   Tue, 14 Sep 2021 20:51:33 +0800
From:   Fengquan Chen <fengquan.chen@...iatek.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Rob Herring <robh+dt@...nel.org>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        <linux-watchdog@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <tinghan.shen@...iatek.com>, <randy.wu@...iatek.com>,
        <rex-bc.chen@...iatek.com>, <christine.zhu@...iatek.com>,
        <joe.yang@...iatek.com>, <zhishuang.zhang@...iatek.com>
Subject: Re: [v2,1/2] watchdog: mtk: add disable_wdt_extrst support

On Fri, 2021-09-03 at 07:05 -0700, Guenter Roeck wrote:
> On 9/2/21 11:16 PM, Fengquan Chen wrote:
> > In some cases, we may need watchdog just to trigger an
> > internal soc reset without sending any output signal.
> > 
> > Provide a disable_wdt_extrst parameter for configuration.
> > We can disable or enable it just by configuring dts.
> > 
> > Signed-off-by: fengquan.chen <fengquan.chen@...iatek.com>
> 
> Nit: You should set up git such that it uses "Fengquan Chen", not
> "fengquan.chen".
> 
> Other than that, for my reference,
> 
> Reviewed-by: Guenter Roeck <linux@...ck-us.net>
> 
> We'll have to wait for dt property approval before we can apply the
> patch.
> 
> Thanks,
> Guenter

Thanks, i have uploaded a new v3 to fix the signed-off name,
and move the dt-binding patch to the first patch.

Best Regards
Fengquan

> 
> > ---
> >   drivers/watchdog/mtk_wdt.c | 7 +++++++
> >   1 file changed, 7 insertions(+)
> > 
> > diff --git a/drivers/watchdog/mtk_wdt.c
> > b/drivers/watchdog/mtk_wdt.c
> > index 97ca993bd009..276b6cb7d225 100644
> > --- a/drivers/watchdog/mtk_wdt.c
> > +++ b/drivers/watchdog/mtk_wdt.c
> > @@ -63,6 +63,7 @@ struct mtk_wdt_dev {
> >   	void __iomem *wdt_base;
> >   	spinlock_t lock; /* protects WDT_SWSYSRST reg */
> >   	struct reset_controller_dev rcdev;
> > +	bool disable_wdt_extrst;
> >   };
> >   
> >   struct mtk_wdt_data {
> > @@ -240,6 +241,8 @@ static int mtk_wdt_start(struct watchdog_device
> > *wdt_dev)
> >   
> >   	reg = ioread32(wdt_base + WDT_MODE);
> >   	reg &= ~(WDT_MODE_IRQ_EN | WDT_MODE_DUAL_EN);
> > +	if (mtk_wdt->disable_wdt_extrst)
> > +		reg &= ~WDT_MODE_EXRST_EN;
> >   	reg |= (WDT_MODE_EN | WDT_MODE_KEY);
> >   	iowrite32(reg, wdt_base + WDT_MODE);
> >   
> > @@ -309,6 +312,10 @@ static int mtk_wdt_probe(struct
> > platform_device *pdev)
> >   		if (err)
> >   			return err;
> >   	}
> > +
> > +	mtk_wdt->disable_wdt_extrst =
> > +		of_property_read_bool(dev->of_node, "mediatek,disable-
> > extrst");
> > +
> >   	return 0;
> >   }
> >   
> > 
> 
>