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

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Date:   Sat, 31 Dec 2022 13:55:37 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Michal Simek <michal.simek@...inx.com>
Cc:     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: of_xilinx_wdt: Use devm_clk_get_enabled()
 helper

Le 31/12/2022 à 13:51, Christophe JAILLET a écrit :
> 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>
> ---
> Note that the order of operations is slightly modified by this patch. The
> clk is now prepare_enable()'ed before calling clk_get_rate().
> ---
>   drivers/watchdog/of_xilinx_wdt.c | 11 +----------
>   1 file changed, 1 insertion(+), 10 deletions(-)
> 
> diff --git a/drivers/watchdog/of_xilinx_wdt.c b/drivers/watchdog/of_xilinx_wdt.c
> index 3318544366b8..f184843380a3 100644
> --- a/drivers/watchdog/of_xilinx_wdt.c
> +++ b/drivers/watchdog/of_xilinx_wdt.c
> @@ -193,7 +193,7 @@ static int xwdt_probe(struct platform_device *pdev)
>   
>   	watchdog_set_nowayout(xilinx_wdt_wdd, enable_once);
>   
> -	xdev->clk = devm_clk_get(dev, NULL);
> +	xdev->clk = devm_clk_get_enabled(dev, NULL);
>   	if (IS_ERR(xdev->clk)) {
>   		if (PTR_ERR(xdev->clk) != -ENOENT)
>   			return PTR_ERR(xdev->clk);
> @@ -211,15 +211,6 @@ static int xwdt_probe(struct platform_device *pdev)
>   				 "The watchdog clock freq cannot be obtained\n");
>   	} else {
>   		pfreq = clk_get_rate(xdev->clk);
> -		rc = clk_prepare_enable(xdev->clk);
> -		if (rc) {
> -			dev_err(dev, "unable to enable clock\n");
> -			return rc;
> -		}
> -		rc = devm_add_action_or_reset(dev, xwdt_clk_disable_unprepare,
> -					      xdev->clk);
> -		if (rc)
> -			return rc;
>   	}
>   
>   	/*

NACK.

This one is incomplet, xwdt_clk_disable_unprepare() should be removed 
as-well.

I'll send a v2.

CJ