linux-kernel - RE: [PATCH v4 2/2] watchdog: Add watchdog driver for Sunplus SP7021

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Date:   Tue, 4 Jan 2022 02:48:17 +0000
From:   xt.hu[胡先韬] <xt.hu@...lus1.com>
To:     Guenter Roeck <linux@...ck-us.net>
CC:     "wim@...ux-watchdog.org" <wim@...ux-watchdog.org>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Wells Lu 呂芳騰 <wells.lu@...plus.com>,
        qinjian[覃健] <qinjian@...lus1.com>
Subject: RE: [PATCH v4 2/2] watchdog: Add watchdog driver for Sunplus SP7021

> -----Original Message-----
> From: Guenter Roeck [mailto:groeck7@...il.com] On Behalf Of Guenter Roeck
> Sent: Sunday, January 2, 2022 11:00 PM
> To: xt.hu[胡先韬] <xt.hu@...lus1.com>
> Cc: wim@...ux-watchdog.org; p.zabel@...gutronix.de; linux-kernel@...r.kernel.org;
> linux-watchdog@...r.kernel.org; robh+dt@...nel.org; devicetree@...r.kernel.org; Wells Lu 呂芳騰
> <wells.lu@...plus.com>; qinjian[覃健] <qinjian@...lus1.com>
> Subject: Re: [PATCH v4 2/2] watchdog: Add watchdog driver for Sunplus SP7021
> 
> On Wed, Dec 29, 2021 at 01:43:08PM +0800, Xiantao Hu wrote:
> > Sunplus SP7021 requires watchdog timer support.
> > Add watchdog driver to enable this.
> >
> > Signed-off-by: Xiantao Hu <xt.hu@...lus1.com>
> > ---
> > Changes in v4
> >  - Drop the unused varible struct resource *wdt_res.
> >  - Drop the operations related to address 0x9c000274.
> >    Put it in bootloader before entry kernel boot in v3.
> >
> >...
> > +{
> > +	wdev->timeout = timeout;
> > +	sp_wdt_ping(wdev);
> 
> This is exactly what the calling code does if there is no set_timeout
> function, so you can just drop this function,
> 

OK. I will drop it.

> > ...
> > +
> > +	err = clk_prepare_enable(priv->clk);
> > +	if (err) {
> > +		dev_err(dev, "Clock can't be enabled correctly\n");
> > +		return err;
> > +	}
> > +
> > +	/* The timer and watchdog shared the STC reset */
> > +	priv->rstc = devm_reset_control_get_shared(dev, NULL);
> > +	if (!IS_ERR(priv->rstc))
> > +		reset_control_deassert(priv->rstc);
> > +
> > +	err = devm_add_action_or_reset(dev, sp_reset_control_assert,
> > +				       priv->rstc);
> > +	if (err)
> > +		return err;
> > +
> 
> devm_add_action_or_reset() above should only be called if
> devm_reset_control_get_shared succeeds.
> 

OK. I will modify it.

> > +	err = devm_add_action_or_reset(dev, sp_clk_disable_unprepare,
> > +				       priv->clk);
> 
> This should be called immediately after clk_prepare_enable().
> 

OK. I will modify it.

> > +	if (err)
> > +		return err;
> > ...