linux-kernel - Re: [PATCH 1/2] watchdog: s3c2410_wdt: Use Use devm_clk_get[_optional]

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Date:   Sat, 4 Mar 2023 22:46:34 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Guenter Roeck <linux@...ck-us.net>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Alim Akhtar <alim.akhtar@...sung.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-watchdog@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH 1/2] watchdog: s3c2410_wdt: Use Use
 devm_clk_get[_optional]_enabled() helpers

Le 04/03/2023 à 17:56, Guenter Roeck a écrit :
> The devm_clk_get[_optional]_enabled() helpers:
>      - call devm_clk_get[_optional]()
>      - call clk_prepare_enable() and register what is needed in order to
>        call clk_disable_unprepare() when needed, as a managed resource.
> 
> This simplifies the code and avoids the calls to clk_disable_unprepare().
> 
> While at it, use dev_err_probe consistently, and use its return value
> to return the error code.
> 
> Cc: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>   drivers/watchdog/s3c2410_wdt.c | 45 +++++++---------------------------
>   1 file changed, 9 insertions(+), 36 deletions(-)
> 
> diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
> index 200ba236a72e..a1fcb79b0b7c 100644
> --- a/drivers/watchdog/s3c2410_wdt.c
> +++ b/drivers/watchdog/s3c2410_wdt.c
> @@ -661,35 +661,17 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
>   	if (IS_ERR(wdt->reg_base))
>   		return PTR_ERR(wdt->reg_base);
>   
> -	wdt->bus_clk = devm_clk_get(dev, "watchdog");
> -	if (IS_ERR(wdt->bus_clk)) {
> -		dev_err(dev, "failed to find bus clock\n");
> -		return PTR_ERR(wdt->bus_clk);
> -	}
> -
> -	ret = clk_prepare_enable(wdt->bus_clk);
> -	if (ret < 0) {
> -		dev_err(dev, "failed to enable bus clock\n");
> -		return ret;
> -	}
> +	wdt->bus_clk = devm_clk_get_enabled(dev, "watchdog");
> +	if (IS_ERR(wdt->bus_clk))
> +		return dev_err_probe(dev, PTR_ERR(wdt->bus_clk), "failed to get bus clock\n");
>   
>   	/*
>   	 * "watchdog_src" clock is optional; if it's not present -- just skip it
>   	 * and use "watchdog" clock as both bus and source clock.
>   	 */
> -	wdt->src_clk = devm_clk_get_optional(dev, "watchdog_src");
> -	if (IS_ERR(wdt->src_clk)) {
> -		dev_err_probe(dev, PTR_ERR(wdt->src_clk),
> -			      "failed to get source clock\n");
> -		ret = PTR_ERR(wdt->src_clk);
> -		goto err_bus_clk;
> -	}
> -
> -	ret = clk_prepare_enable(wdt->src_clk);
> -	if (ret) {
> -		dev_err(dev, "failed to enable source clock\n");
> -		goto err_bus_clk;
> -	}
> +	wdt->src_clk = devm_clk_get_optional_enabled(dev, "watchdog_src");
> +	if (IS_ERR(wdt->src_clk))
> +		return dev_err_probe(dev, PTR_ERR(wdt->src_clk), "failed to get source clock\n");
>   
>   	wdt->wdt_device.min_timeout = 1;
>   	wdt->wdt_device.max_timeout = s3c2410wdt_max_timeout(wdt);
> @@ -710,7 +692,7 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
>   				 S3C2410_WATCHDOG_DEFAULT_TIME);
>   		} else {
>   			dev_err(dev, "failed to use default timeout\n");
> -			goto err_src_clk;
> +			return ret;

Hi,

Nit: this also could be "return dev_err_probe()"

>   		}
>   	}
>   
> @@ -718,7 +700,7 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
>   			       pdev->name, pdev);
>   	if (ret != 0) {
>   		dev_err(dev, "failed to install irq (%d)\n", ret);
> -		goto err_src_clk;
> +		return ret;

Nit: this also could be "return dev_err_probe()"

CJ

>   	}
>   
>   	watchdog_set_nowayout(&wdt->wdt_device, nowayout);
> @@ -744,7 +726,7 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
>   
>   	ret = watchdog_register_device(&wdt->wdt_device);
>   	if (ret)
> -		goto err_src_clk;
> +		return ret;
>   
>   	ret = s3c2410wdt_enable(wdt, true);
>   	if (ret < 0)
> @@ -766,12 +748,6 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
>    err_unregister:
>   	watchdog_unregister_device(&wdt->wdt_device);
>   
> - err_src_clk:
> -	clk_disable_unprepare(wdt->src_clk);
> -
> - err_bus_clk:
> -	clk_disable_unprepare(wdt->bus_clk);
> -
>   	return ret;
>   }
>   
> @@ -786,9 +762,6 @@ static int s3c2410wdt_remove(struct platform_device *dev)
>   
>   	watchdog_unregister_device(&wdt->wdt_device);
>   
> -	clk_disable_unprepare(wdt->src_clk);
> -	clk_disable_unprepare(wdt->bus_clk);
> -
>   	return 0;
>   }
>