linux-kernel - Re: [PATCH] watchdog: pnx4008: Use devm_clk_get

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Message-ID: <20230103211555.GF212337@roeck-us.net>
Date:   Tue, 3 Jan 2023 13:15:55 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Vladimir Zapolskiy <vz@...ia.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-watchdog@...r.kernel.org
Subject: Re: [PATCH] watchdog: pnx4008: Use devm_clk_get_enabled() helper

On Sat, Dec 31, 2022 at 03:25:31PM +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/pnx4008_wdt.c | 15 +--------------
>  1 file changed, 1 insertion(+), 14 deletions(-)
> 
> diff --git a/drivers/watchdog/pnx4008_wdt.c b/drivers/watchdog/pnx4008_wdt.c
> index e0ea133c1690..87a44a5675a1 100644
> --- a/drivers/watchdog/pnx4008_wdt.c
> +++ b/drivers/watchdog/pnx4008_wdt.c
> @@ -179,11 +179,6 @@ static struct watchdog_device pnx4008_wdd = {
>  	.max_timeout = MAX_HEARTBEAT,
>  };
>  
> -static void pnx4008_clk_disable_unprepare(void *data)
> -{
> -	clk_disable_unprepare(data);
> -}
> -
>  static int pnx4008_wdt_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> @@ -195,18 +190,10 @@ static int pnx4008_wdt_probe(struct platform_device *pdev)
>  	if (IS_ERR(wdt_base))
>  		return PTR_ERR(wdt_base);
>  
> -	wdt_clk = devm_clk_get(dev, NULL);
> +	wdt_clk = devm_clk_get_enabled(dev, NULL);
>  	if (IS_ERR(wdt_clk))
>  		return PTR_ERR(wdt_clk);
>  
> -	ret = clk_prepare_enable(wdt_clk);
> -	if (ret)
> -		return ret;
> -	ret = devm_add_action_or_reset(dev, pnx4008_clk_disable_unprepare,
> -				       wdt_clk);
> -	if (ret)
> -		return ret;
> -
>  	pnx4008_wdd.bootstatus = (readl(WDTIM_RES(wdt_base)) & WDOG_RESET) ?
>  			WDIOF_CARDRESET : 0;
>  	pnx4008_wdd.parent = dev;
> -- 
> 2.34.1
>