linux-kernel - Re: [PATCH v3 2/2] thermal: mediatek: change clk_prepare_enable to devm_clk_get_enabled in mtk_thermal

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Message-ID: <4fed91ef.3c256.18783c407e3.Coremail.void0red@hust.edu.cn>
Date:   Sat, 15 Apr 2023 15:14:35 +0800 (GMT+08:00)
From:   void0red@...t.edu.cn
To:     daniel.lezcano@...aro.org
Cc:     amitk@...nel.org, angelogioacchino.delregno@...labora.com,
        bchihi@...libre.com, daniel@...rotopia.org, dzm91@...t.edu.cn,
        error27@...il.com, henry.yen@...iatek.com,
        hust-os-kernel-patches@...glegroups.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-pm@...r.kernel.org,
        matthias.bgg@...il.com, rafael@...nel.org, rdunlap@...radead.org,
        rui.zhang@...el.com, void0red@...il.com
Subject: Re: [PATCH v3 2/2] thermal: mediatek: change clk_prepare_enable to
 devm_clk_get_enabled in mtk_thermal_probe




> -----Original Messages-----
> From: "Kang Chen" <void0red@...t.edu.cn>
> Sent Time: 2023-04-11 14:35:31 (Tuesday)
> To: daniel.lezcano@...aro.org
> Cc: amitk@...nel.org, angelogioacchino.delregno@...labora.com, bchihi@...libre.com, daniel@...rotopia.org, dzm91@...t.edu.cn, error27@...il.com, henry.yen@...iatek.com, hust-os-kernel-patches@...glegroups.com, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org, linux-pm@...r.kernel.org, matthias.bgg@...il.com, rafael@...nel.org, rdunlap@...radead.org, rui.zhang@...el.com, void0red@...il.com, void0red@...t.edu.cn
> Subject: [PATCH v3 2/2] thermal: mediatek: change clk_prepare_enable to devm_clk_get_enabled in mtk_thermal_probe
> 
> use devm_clk_get_enabled to do automatic resource management.
> Meanwhile, remove error handling labels in the probe function and
> the whole remove function.
> 
> Signed-off-by: Kang Chen <void0red@...t.edu.cn>
> Reviewed-by: Dongliang Mu <dzm91@...t.edu.cn>
> ---
> v3 -> v2: remove some useles func calls.
> v2 -> v1: init
> 
> Notice the devm_clk_get_enabled do the clk_get and clk_prepare_enable
> at the same time.
> I'm not sure if this has any side effects in initialization.
> 
>  drivers/thermal/mediatek/auxadc_thermal.c | 48 +++++------------------
>  1 file changed, 10 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/thermal/mediatek/auxadc_thermal.c b/drivers/thermal/mediatek/auxadc_thermal.c
> index 3372f7c29626..995837ce3ea2 100644
> --- a/drivers/thermal/mediatek/auxadc_thermal.c
> +++ b/drivers/thermal/mediatek/auxadc_thermal.c
> @@ -1116,14 +1116,6 @@ static int mtk_thermal_probe(struct platform_device *pdev)
>  
>  	mt->conf = of_device_get_match_data(&pdev->dev);
>  
> -	mt->clk_peri_therm = devm_clk_get(&pdev->dev, "therm");
> -	if (IS_ERR(mt->clk_peri_therm))
> -		return PTR_ERR(mt->clk_peri_therm);
> -
> -	mt->clk_auxadc = devm_clk_get(&pdev->dev, "auxadc");
> -	if (IS_ERR(mt->clk_auxadc))
> -		return PTR_ERR(mt->clk_auxadc);
> -
>  	mt->thermal_base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
>  	if (IS_ERR(mt->thermal_base))
>  		return PTR_ERR(mt->thermal_base);
> @@ -1182,16 +1174,16 @@ static int mtk_thermal_probe(struct platform_device *pdev)
>  	if (ret)
>  		return ret;
>  
> -	ret = clk_prepare_enable(mt->clk_auxadc);
> -	if (ret) {
> -		dev_err(&pdev->dev, "Can't enable auxadc clk: %d\n", ret);
> -		return ret;
> +	mt->clk_auxadc = devm_clk_get_enabled(&pdev->dev, "auxadc");
> +	if (IS_ERR(mt->clk_auxadc)) {
> +		dev_err(&pdev->dev, "Can't enable auxadc clk: %d\n", mt->clk_auxadc);
> +		return PTR_ERR(mt->clk_auxadc);
>  	}
>  
> -	ret = clk_prepare_enable(mt->clk_peri_therm);
> -	if (ret) {
> -		dev_err(&pdev->dev, "Can't enable peri clk: %d\n", ret);
> -		goto err_disable_clk_auxadc;
> +	mt->clk_peri_therm = devm_clk_get_enabled(&pdev->dev, "therm");
> +	if (IS_ERR(mt->clk_peri_therm)) {
> +		dev_err(&pdev->dev, "Can't enable peri clk: %d\n", mt->clk_peri_therm);
> +		return PTR_ERR(mt->clk_peri_therm);
>  	}
>  
>  	if (mt->conf->version != MTK_THERMAL_V1) {
> @@ -1215,38 +1207,18 @@ static int mtk_thermal_probe(struct platform_device *pdev)
>  
>  	tzdev = devm_thermal_of_zone_register(&pdev->dev, 0, mt,
>  					      &mtk_thermal_ops);
> -	if (IS_ERR(tzdev)) {
> -		ret = PTR_ERR(tzdev);
> -		goto err_disable_clk_peri_therm;
> -	}
> +	if (IS_ERR(tzdev))
> +		return PTR_ERR(tzdev);
>  
>  	ret = devm_thermal_add_hwmon_sysfs(tzdev);
>  	if (ret)
>  		dev_warn(&pdev->dev, "error in thermal_add_hwmon_sysfs");
>  
>  	return 0;
> -
> -err_disable_clk_peri_therm:
> -	clk_disable_unprepare(mt->clk_peri_therm);
> -err_disable_clk_auxadc:
> -	clk_disable_unprepare(mt->clk_auxadc);
> -
> -	return ret;
> -}
> -
> -static int mtk_thermal_remove(struct platform_device *pdev)
> -{
> -	struct mtk_thermal *mt = platform_get_drvdata(pdev);
> -
> -	clk_disable_unprepare(mt->clk_peri_therm);
> -	clk_disable_unprepare(mt->clk_auxadc);
> -
> -	return 0;
>  }
>  
>  static struct platform_driver mtk_thermal_driver = {
>  	.probe = mtk_thermal_probe,
> -	.remove = mtk_thermal_remove,
>  	.driver = {
>  		.name = "mtk-thermal",
>  		.of_match_table = mtk_thermal_of_match,
> -- 
> 2.34.1

ping?