linux-kernel - Re: [PATCH v5 1/3] drivers/thermal/exynos: Refactor clk_sec initialization inside SOC-specific case

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Message-ID: <0658a7d4-3048-4078-af14-574b87e4122a@arm.com>
Date: Tue, 15 Apr 2025 09:47:27 +0100
From: Lukasz Luba <lukasz.luba@....com>
To: Anand Moon <linux.amoon@...il.com>
Cc: open list <linux-kernel@...r.kernel.org>,
 Justin Stitt <justinstitt@...gle.com>, Bill Wendling <morbo@...gle.com>,
 Alim Akhtar <alim.akhtar@...sung.com>, Krzysztof Kozlowski
 <krzk@...nel.org>, Daniel Lezcano <daniel.lezcano@...aro.org>,
 Zhang Rui <rui.zhang@...el.com>,
 "open list:CLANG/LLVM BUILD SUPPORT:Keyword:b(?i:clang|llvm)b"
 <llvm@...ts.linux.dev>,
 "open list:SAMSUNG THERMAL DRIVER" <linux-samsung-soc@...r.kernel.org>,
 "open list:SAMSUNG THERMAL DRIVER" <linux-pm@...r.kernel.org>,
 "Rafael J. Wysocki" <rafael@...nel.org>,
 "moderated list:ARM/SAMSUNG S3C, S5P AND EXYNOS ARM ARCHITECTURES"
 <linux-arm-kernel@...ts.infradead.org>, Nathan Chancellor
 <nathan@...nel.org>, Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
 Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Subject: Re: [PATCH v5 1/3] drivers/thermal/exynos: Refactor clk_sec
 initialization inside SOC-specific case



On 4/10/25 07:37, Anand Moon wrote:
> Refactor the initialization of the clk_sec clock to be inside the
> SOC_ARCH_EXYNOS5420_TRIMINFO case. It ensures that the clk_sec clock
> is only initialized for the specified SOC and not for other SOCs,
> thereby simplifying the code. The clk_sec clock is used by the TMU
> for GPU on the Exynos 542x platform.
> 
> Removed redundant IS_ERR() checks for the clk_sec clock since error
> handling is already managed internally by clk_unprepare() functions.
> 
> Signed-off-by: Anand Moon <linux.amoon@...il.com>
> ---
> v5: None
> v4: Fix the aligment of code clk for clk_prepare in proper if/else block.
>      update the commit for clk_sec used.
>      checked to goto clean up all the clks are proper.
>      drop IS_ERR() check for clk_sec.
> v3: improve the commit message.
> ---
>   drivers/thermal/samsung/exynos_tmu.c | 37 ++++++++++++++--------------
>   1 file changed, 18 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
> index 47a99b3c5395..3657920de000 100644
> --- a/drivers/thermal/samsung/exynos_tmu.c
> +++ b/drivers/thermal/samsung/exynos_tmu.c
> @@ -1037,29 +1037,30 @@ static int exynos_tmu_probe(struct platform_device *pdev)
>   		return ret;
>   
>   	data->clk = devm_clk_get(dev, "tmu_apbif");
> -	if (IS_ERR(data->clk))
> +	if (IS_ERR(data->clk)) {
>   		return dev_err_probe(dev, PTR_ERR(data->clk), "Failed to get clock\n");
> -
> -	data->clk_sec = devm_clk_get(dev, "tmu_triminfo_apbif");
> -	if (IS_ERR(data->clk_sec)) {
> -		if (data->soc == SOC_ARCH_EXYNOS5420_TRIMINFO)
> -			return dev_err_probe(dev, PTR_ERR(data->clk_sec),
> -					     "Failed to get triminfo clock\n");
>   	} else {
> -		ret = clk_prepare(data->clk_sec);
> +		ret = clk_prepare(data->clk);
>   		if (ret) {
>   			dev_err(dev, "Failed to get clock\n");
>   			return ret;
>   		}
>   	}
>   
> -	ret = clk_prepare(data->clk);
> -	if (ret) {
> -		dev_err(dev, "Failed to get clock\n");
> -		goto err_clk_sec;
> -	}
> -
>   	switch (data->soc) {
> +	case SOC_ARCH_EXYNOS5420_TRIMINFO:
> +		data->clk_sec = devm_clk_get(dev, "tmu_triminfo_apbif");
> +		if (IS_ERR(data->clk_sec)) {
> +			ret = dev_err_probe(dev, PTR_ERR(data->clk_sec),
> +					    "Failed to get clk_sec clock\n");
> +			goto err_clk;
> +		}
> +		ret = clk_prepare(data->clk_sec);
> +		if (ret) {
> +			dev_err(dev, "Failed to prepare clk_sec clock\n");
> +			goto err_clk_sec;
> +		}
> +		break;
>   	case SOC_ARCH_EXYNOS5433:
>   	case SOC_ARCH_EXYNOS7:
>   		data->sclk = devm_clk_get(dev, "tmu_sclk");
> @@ -1112,11 +1113,10 @@ static int exynos_tmu_probe(struct platform_device *pdev)
>   
>   err_sclk:
>   	clk_disable_unprepare(data->sclk);
> +err_clk_sec:
> +	clk_unprepare(data->clk_sec);
>   err_clk:
>   	clk_unprepare(data->clk);
> -err_clk_sec:
> -	if (!IS_ERR(data->clk_sec))
> -		clk_unprepare(data->clk_sec);
>   	return ret;
>   }
>   
> @@ -1128,8 +1128,7 @@ static void exynos_tmu_remove(struct platform_device *pdev)
>   
>   	clk_disable_unprepare(data->sclk);
>   	clk_unprepare(data->clk);
> -	if (!IS_ERR(data->clk_sec))
> -		clk_unprepare(data->clk_sec);
> +	clk_unprepare(data->clk_sec);
>   }
>   
>   #ifdef CONFIG_PM_SLEEP

It looks good. I've missed the v4 where you addressed my comments.

Reviewed-by: Lukasz Luba <lukasz.luba@....com>