linux-kernel - Re: [PATCH v4 1/1] watchdog: imx7ulp_wdt: move post_rcs_wait into struct imx_wdt_hw

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Message-ID: <ZqgGtzLvV0QGR0PW@lizhi-Precision-Tower-5810>
Date: Mon, 29 Jul 2024 17:16:39 -0400
From: Frank Li <Frank.li@....com>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc: alice.guo@....com, festevam@...il.com, imx@...ts.linux.dev,
	kernel@...gutronix.de, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org,
	linux@...ck-us.net, s.hauer@...gutronix.de, shawnguo@...nel.org,
	wim@...ux-watchdog.org, ye.li@....com
Subject: Re: [PATCH v4 1/1] watchdog: imx7ulp_wdt: move post_rcs_wait into
 struct imx_wdt_hw_feature

On Mon, Jul 29, 2024 at 11:12:13PM +0200, Christophe JAILLET wrote:
> Le 29/07/2024 à 22:06, Frank Li a écrit :
> > Move post_rcs_wait into struct imx_wdt_hw_feature to simple code logic for
> > difference compatible string.
> > 
> > i.MX93 watchdog needn't wait 2.5 clocks after RCS is done. So needn't set
> > post_rcs_wait.
> > 
> > Reviewed-by: Guenter Roeck <linux-0h96xk9xTtrk1uMJSBkQmQ@...lic.gmane.org>
> > Signed-off-by: Alice Guo <alice.guo-3arQi8VN3Tc@...lic.gmane.org>
> > Reviewed-by: Ye Li <ye.li-3arQi8VN3Tc@...lic.gmane.org>
> > Signed-off-by: Frank Li <Frank.Li-3arQi8VN3Tc@...lic.gmane.org>
> > ---
> > Chagne from v3 to v4:
> > - Go back to v2 according to Guenter's feedback
> > Change from v2 to v3:
> > - Set post_rcs_wait to false explicitly to maintain code consistency
> > - Add Guenter review tag.
> > Change from v1 to v2:
> > - Combine to one patch
> > ---
> >   drivers/watchdog/imx7ulp_wdt.c | 21 +++++++++------------
> >   1 file changed, 9 insertions(+), 12 deletions(-)
> > 
> > diff --git a/drivers/watchdog/imx7ulp_wdt.c b/drivers/watchdog/imx7ulp_wdt.c
> > index 94914a22daff7..3a75a6f98f8f0 100644
> > --- a/drivers/watchdog/imx7ulp_wdt.c
> > +++ b/drivers/watchdog/imx7ulp_wdt.c
> > @@ -55,6 +55,7 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
> >   struct imx_wdt_hw_feature {
> >   	bool prescaler_enable;
> > +	bool post_rcs_wait;
> >   	u32 wdog_clock_rate;
> >   };
> > @@ -62,7 +63,6 @@ struct imx7ulp_wdt_device {
> >   	struct watchdog_device wdd;
> >   	void __iomem *base;
> >   	struct clk *clk;
> > -	bool post_rcs_wait;
> >   	bool ext_reset;
> >   	const struct imx_wdt_hw_feature *hw;
> >   };
> > @@ -95,7 +95,7 @@ static int imx7ulp_wdt_wait_rcs(struct imx7ulp_wdt_device *wdt)
> >   		ret = -ETIMEDOUT;
> >   	/* Wait 2.5 clocks after RCS done */
> > -	if (wdt->post_rcs_wait)
> > +	if (wdt->hw->post_rcs_wait)
> >   		usleep_range(wait_min, wait_min + 2000);
> >   	return ret;
> > @@ -334,15 +334,6 @@ static int imx7ulp_wdt_probe(struct platform_device *pdev)
> >   	/* The WDOG may need to do external reset through dedicated pin */
> >   	imx7ulp_wdt->ext_reset = of_property_read_bool(dev->of_node, "fsl,ext-reset-output");
> > -	imx7ulp_wdt->post_rcs_wait = true;
> > -	if (of_device_is_compatible(dev->of_node,
> > -				    "fsl,imx8ulp-wdt")) {
> > -		dev_info(dev, "imx8ulp wdt probe\n");
> > -		imx7ulp_wdt->post_rcs_wait = false;
> > -	} else {
> > -		dev_info(dev, "imx7ulp wdt probe\n");
> > -	}
> > -
> >   	wdog = &imx7ulp_wdt->wdd;
> >   	wdog->info = &imx7ulp_wdt_info;
> >   	wdog->ops = &imx7ulp_wdt_ops;
> > @@ -403,6 +394,12 @@ static const struct dev_pm_ops imx7ulp_wdt_pm_ops = {
> >   static const struct imx_wdt_hw_feature imx7ulp_wdt_hw = {
> >   	.prescaler_enable = false,
> >   	.wdog_clock_rate = 1000,
> > +	.post_rcs_wait = true,
> > +};
> > +
> > +static const struct imx_wdt_hw_feature imx8ulp_wdt_hw = {
> > +	.prescaler_enable = false,
> > +	.wdog_clock_rate = 1000,
> >   };
> >   static const struct imx_wdt_hw_feature imx93_wdt_hw = {
> > @@ -411,7 +408,7 @@ static const struct imx_wdt_hw_feature imx93_wdt_hw = {
> >   };
> >   static const struct of_device_id imx7ulp_wdt_dt_ids[] = {
> > -	{ .compatible = "fsl,imx8ulp-wdt", .data = &imx7ulp_wdt_hw, },
> > +	{ .compatible = "fsl,imx8ulp-wdt", .data = &imx8ulp_wdt_hw, },
> 
> Nitpick: while touching something here, should imx8ulp be after imx7ulp?

Yes, it should be better. 

Guenter: do you think it is okay to move it after 7ulp?

Frank

> 
> CJ
> 
> >   	{ .compatible = "fsl,imx7ulp-wdt", .data = &imx7ulp_wdt_hw, },
> >   	{ .compatible = "fsl,imx93-wdt", .data = &imx93_wdt_hw, },
> >   	{ /* sentinel */ }
>