linux-kernel - Re: [PATCH] watchdog: imx7ulp: Use devm_clk_get

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Date:   Sat, 31 Dec 2022 15:10:43 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-watchdog@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] watchdog: imx7ulp: Use devm_clk_get_enabled() helper

On Sat, Dec 31, 2022 at 11:59:57AM +0100, 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 and avoids the need of a dedicated function used
> with devm_add_action_or_reset().
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

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

> ---
>  drivers/watchdog/imx7ulp_wdt.c | 15 +--------------
>  1 file changed, 1 insertion(+), 14 deletions(-)
> 
> diff --git a/drivers/watchdog/imx7ulp_wdt.c b/drivers/watchdog/imx7ulp_wdt.c
> index 2897902090b3..7ca486794ba7 100644
> --- a/drivers/watchdog/imx7ulp_wdt.c
> +++ b/drivers/watchdog/imx7ulp_wdt.c
> @@ -299,11 +299,6 @@ static int imx7ulp_wdt_init(struct imx7ulp_wdt_device *wdt, unsigned int timeout
>  	return ret;
>  }
>  
> -static void imx7ulp_wdt_action(void *data)
> -{
> -	clk_disable_unprepare(data);
> -}
> -
>  static int imx7ulp_wdt_probe(struct platform_device *pdev)
>  {
>  	struct imx7ulp_wdt_device *imx7ulp_wdt;
> @@ -321,7 +316,7 @@ static int imx7ulp_wdt_probe(struct platform_device *pdev)
>  	if (IS_ERR(imx7ulp_wdt->base))
>  		return PTR_ERR(imx7ulp_wdt->base);
>  
> -	imx7ulp_wdt->clk = devm_clk_get(dev, NULL);
> +	imx7ulp_wdt->clk = devm_clk_get_enabled(dev, NULL);
>  	if (IS_ERR(imx7ulp_wdt->clk)) {
>  		dev_err(dev, "Failed to get watchdog clock\n");
>  		return PTR_ERR(imx7ulp_wdt->clk);
> @@ -336,14 +331,6 @@ static int imx7ulp_wdt_probe(struct platform_device *pdev)
>  		dev_info(dev, "imx7ulp wdt probe\n");
>  	}
>  
> -	ret = clk_prepare_enable(imx7ulp_wdt->clk);
> -	if (ret)
> -		return ret;
> -
> -	ret = devm_add_action_or_reset(dev, imx7ulp_wdt_action, imx7ulp_wdt->clk);
> -	if (ret)
> -		return ret;
> -
>  	wdog = &imx7ulp_wdt->wdd;
>  	wdog->info = &imx7ulp_wdt_info;
>  	wdog->ops = &imx7ulp_wdt_ops;
> -- 
> 2.34.1
>