linux-kernel - Re: [PATCH v3 1/1] watchdog: imx7ulp_wdt: move post_rcs_wait into struct imx_wdt_hw

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Message-ID: <3ae98ea1-23a4-4e0f-9a1c-62eed84b42ef@roeck-us.net>
Date: Mon, 15 Jul 2024 11:01:04 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Frank Li <Frank.Li@....com>
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,
 s.hauer@...gutronix.de, shawnguo@...nel.org, wim@...ux-watchdog.org,
 ye.li@....com
Subject: Re: [PATCH v3 1/1] watchdog: imx7ulp_wdt: move post_rcs_wait into
 struct imx_wdt_hw_feature

On 7/15/24 10:07, Frank Li wrote:
> Move post_rcs_wait into struct imx_wdt_hw_feature to simplify code logic
> for different compatible strings
> 
> i.MX93 and i.MX8ULP watchdog do not need to wait 2.5 clocks after RCS is
> done. Set post_rcs_wait to false explicitly to maintain code consistency.
> 

Why ? That is not necessary and typically frowned upon for static variables.

> Reviewed-by: Guenter Roeck <linux@...ck-us.net>

Please drop. I did not approve this change.

Guenter

> Signed-off-by: Alice Guo <alice.guo@....com>
> Reviewed-by: Ye Li <ye.li@....com>
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
> 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 | 23 +++++++++++------------
>   1 file changed, 11 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/watchdog/imx7ulp_wdt.c b/drivers/watchdog/imx7ulp_wdt.c
> index 94914a22daff7..a4aa02f388b15 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;
> @@ -402,16 +393,24 @@ static const struct dev_pm_ops imx7ulp_wdt_pm_ops = {
>   
>   static const struct imx_wdt_hw_feature imx7ulp_wdt_hw = {
>   	.prescaler_enable = false,
> +	.post_rcs_wait = true,
> +	.wdog_clock_rate = 1000,
> +};
> +
> +static const struct imx_wdt_hw_feature imx8ulp_wdt_hw = {
> +	.prescaler_enable = false,
> +	.post_rcs_wait = false,
>   	.wdog_clock_rate = 1000,
>   };
>   
>   static const struct imx_wdt_hw_feature imx93_wdt_hw = {
>   	.prescaler_enable = true,
> +	.post_rcs_wait = false,
>   	.wdog_clock_rate = 125,
>   };
>   
>   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, },
>   	{ .compatible = "fsl,imx7ulp-wdt", .data = &imx7ulp_wdt_hw, },
>   	{ .compatible = "fsl,imx93-wdt", .data = &imx93_wdt_hw, },
>   	{ /* sentinel */ }