linux-kernel - Re: [PATCH v3 06/12] watchdog: s3c2410: Extract disable and mask code into separate functions

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Message-ID: <20211117133535.GF2435591@roeck-us.net>
Date:   Wed, 17 Nov 2021 05:35:35 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Sam Protsenko <semen.protsenko@...aro.org>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH v3 06/12] watchdog: s3c2410: Extract disable and mask
 code into separate functions

On Sun, Nov 07, 2021 at 10:29:37PM +0200, Sam Protsenko wrote:
> The s3c2410wdt_mask_and_disable_reset() function content is bound to be
> changed further. Prepare it for upcoming changes by splitting into
> separate "mask reset" and "disable reset" functions. But keep
> s3c2410wdt_mask_and_disable_reset() function present as a facade.
> 
> This commit doesn't bring any functional change to existing devices, but
> merely provides an infrastructure for upcoming chips support.
> 
> Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>

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

> ---
> Changes in v3:
>   - Added R-b tag by Krzysztof Kozlowski
> 
> Changes in v2:
>   - (none): it's a new patch
> 
>  drivers/watchdog/s3c2410_wdt.c | 54 ++++++++++++++++++++++------------
>  1 file changed, 35 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
> index 2cc4923a98a5..4ac0a30e835e 100644
> --- a/drivers/watchdog/s3c2410_wdt.c
> +++ b/drivers/watchdog/s3c2410_wdt.c
> @@ -202,37 +202,53 @@ static inline struct s3c2410_wdt *freq_to_wdt(struct notifier_block *nb)
>  	return container_of(nb, struct s3c2410_wdt, freq_transition);
>  }
>  
> -static int s3c2410wdt_mask_and_disable_reset(struct s3c2410_wdt *wdt, bool mask)
> +static int s3c2410wdt_disable_wdt_reset(struct s3c2410_wdt *wdt, bool mask)
>  {
> +	const u32 mask_val = BIT(wdt->drv_data->mask_bit);
> +	const u32 val = mask ? mask_val : 0;
>  	int ret;
> -	u32 mask_val = 1 << wdt->drv_data->mask_bit;
> -	u32 val = 0;
>  
> -	/* No need to do anything if no PMU CONFIG needed */
> -	if (!(wdt->drv_data->quirks & QUIRK_HAS_PMU_CONFIG))
> -		return 0;
> +	ret = regmap_update_bits(wdt->pmureg, wdt->drv_data->disable_reg,
> +				 mask_val, val);
> +	if (ret < 0)
> +		dev_err(wdt->dev, "failed to update reg(%d)\n", ret);
>  
> -	if (mask)
> -		val = mask_val;
> +	return ret;
> +}
>  
> -	if (wdt->drv_data->quirks & QUIRK_HAS_PMU_AUTO_DISABLE) {
> -		ret = regmap_update_bits(wdt->pmureg,
> -					 wdt->drv_data->disable_reg, mask_val,
> -					 val);
> -		if (ret < 0)
> -			goto error;
> -	}
> +static int s3c2410wdt_mask_wdt_reset(struct s3c2410_wdt *wdt, bool mask)
> +{
> +	const u32 mask_val = BIT(wdt->drv_data->mask_bit);
> +	const u32 val = mask ? mask_val : 0;
> +	int ret;
>  
> -	ret = regmap_update_bits(wdt->pmureg,
> -			wdt->drv_data->mask_reset_reg,
> -			mask_val, val);
> - error:
> +	ret = regmap_update_bits(wdt->pmureg, wdt->drv_data->mask_reset_reg,
> +				 mask_val, val);
>  	if (ret < 0)
>  		dev_err(wdt->dev, "failed to update reg(%d)\n", ret);
>  
>  	return ret;
>  }
>  
> +static int s3c2410wdt_mask_and_disable_reset(struct s3c2410_wdt *wdt, bool mask)
> +{
> +	int ret;
> +
> +	if (wdt->drv_data->quirks & QUIRK_HAS_PMU_AUTO_DISABLE) {
> +		ret = s3c2410wdt_disable_wdt_reset(wdt, mask);
> +		if (ret < 0)
> +			return ret;
> +	}
> +
> +	if (wdt->drv_data->quirks & QUIRK_HAS_PMU_CONFIG) {
> +		ret = s3c2410wdt_mask_wdt_reset(wdt, mask);
> +		if (ret < 0)
> +			return ret;
> +	}
> +
> +	return 0;
> +}
> +
>  static int s3c2410wdt_keepalive(struct watchdog_device *wdd)
>  {
>  	struct s3c2410_wdt *wdt = watchdog_get_drvdata(wdd);
> -- 
> 2.30.2
>