linux-kernel - Re: [PATCH] hwmon: (sparx5) Use devm_clk_get

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Date:   Mon, 29 Aug 2022 06:53:38 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Jean Delvare <jdelvare@...e.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        UNGLinuxDriver@...rochip.com, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-hwmon@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] hwmon: (sparx5) Use devm_clk_get_enabled() helper

On Wed, Aug 24, 2022 at 12:25:13PM +0200, Christophe JAILLET wrote:
> The devm_clk_get_enabled() helper:
>    - calls devm_clk_get()
>    - calls clk_prepare_enable() and registers what is needed in order to
>      call clk_disable_unprepare() when needed, as a managed resource.
> 
> This simplifies the code, the error handling paths and avoid the need of
> a dedicated function used with devm_add_action_or_reset().
> 
> Based on my test with allyesconfig, this reduces the .o size from:
>    text	   data	    bss	    dec	    hex	filename
>    2419	   1472	      0	   3891	    f33	drivers/hwmon/sparx5-temp.o
> down to:
>    2155	   1472	      0	   3627	    e2b	drivers/hwmon/sparx5-temp.o
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Applied to hwmon-next.

Thanks,
Guenter

> ---
> devm_clk_get_enabled() is new and is part of 6.0-rc1
> ---
>  drivers/hwmon/sparx5-temp.c | 19 +------------------
>  1 file changed, 1 insertion(+), 18 deletions(-)
> 
> diff --git a/drivers/hwmon/sparx5-temp.c b/drivers/hwmon/sparx5-temp.c
> index 98be48e3a22a..04fd8505e5d6 100644
> --- a/drivers/hwmon/sparx5-temp.c
> +++ b/drivers/hwmon/sparx5-temp.c
> @@ -26,13 +26,6 @@ struct s5_hwmon {
>  	struct clk *clk;
>  };
>  
> -static void s5_temp_clk_disable(void *data)
> -{
> -	struct clk *clk = data;
> -
> -	clk_disable_unprepare(clk);
> -}
> -
>  static void s5_temp_enable(struct s5_hwmon *hwmon)
>  {
>  	u32 val = readl(hwmon->base + TEMP_CFG);
> @@ -113,7 +106,6 @@ static int s5_temp_probe(struct platform_device *pdev)
>  {
>  	struct device *hwmon_dev;
>  	struct s5_hwmon *hwmon;
> -	int ret;
>  
>  	hwmon = devm_kzalloc(&pdev->dev, sizeof(*hwmon), GFP_KERNEL);
>  	if (!hwmon)
> @@ -123,19 +115,10 @@ static int s5_temp_probe(struct platform_device *pdev)
>  	if (IS_ERR(hwmon->base))
>  		return PTR_ERR(hwmon->base);
>  
> -	hwmon->clk = devm_clk_get(&pdev->dev, NULL);
> +	hwmon->clk = devm_clk_get_enabled(&pdev->dev, NULL);
>  	if (IS_ERR(hwmon->clk))
>  		return PTR_ERR(hwmon->clk);
>  
> -	ret = clk_prepare_enable(hwmon->clk);
> -	if (ret)
> -		return ret;
> -
> -	ret = devm_add_action_or_reset(&pdev->dev, s5_temp_clk_disable,
> -				       hwmon->clk);
> -	if (ret)
> -		return ret;
> -
>  	s5_temp_enable(hwmon);
>  
>  	hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev,