[PATCH] watchdog: pic32-dmt: Use devm_clk_get_enabled() helper

[PATCH] watchdog: pic32-dmt: Use devm_clk_get_enabled() helper

[Christophe JAILLET]

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@wanadoo.fr>
---
 drivers/watchdog/pic32-dmt.c | 15 +--------------
 1 file changed, 1 insertion(+), 14 deletions(-)

diff --git a/drivers/watchdog/pic32-dmt.c b/drivers/watchdog/pic32-dmt.c
index f43062b3c4c8..bc4ccddc75a3 100644
--- a/drivers/watchdog/pic32-dmt.c
+++ b/drivers/watchdog/pic32-dmt.c
@@ -164,11 +164,6 @@ static struct watchdog_device pic32_dmt_wdd = {
 	.ops		= &pic32_dmt_fops,
 };
 
-static void pic32_clk_disable_unprepare(void *data)
-{
-	clk_disable_unprepare(data);
-}
-
 static int pic32_dmt_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -184,20 +179,12 @@ static int pic32_dmt_probe(struct platform_device *pdev)
 	if (IS_ERR(dmt->regs))
 		return PTR_ERR(dmt->regs);
 
-	dmt->clk = devm_clk_get(dev, NULL);
+	dmt->clk = devm_clk_get_enabled(dev, NULL);
 	if (IS_ERR(dmt->clk)) {
 		dev_err(dev, "clk not found\n");
 		return PTR_ERR(dmt->clk);
 	}
 
-	ret = clk_prepare_enable(dmt->clk);
-	if (ret)
-		return ret;
-	ret = devm_add_action_or_reset(dev, pic32_clk_disable_unprepare,
-				       dmt->clk);
-	if (ret)
-		return ret;
-
 	wdd->timeout = pic32_dmt_get_timeout_secs(dmt);
 	if (!wdd->timeout) {
 		dev_err(dev, "failed to read watchdog register timeout\n");
-- 
2.34.1

Re: [PATCH] watchdog: pic32-dmt: Use devm_clk_get_enabled() helper

[Guenter Roeck]

On Sat, Dec 31, 2022 at 03:20:29PM +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@wanadoo.fr>

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

> ---
>  drivers/watchdog/pic32-dmt.c | 15 +--------------
>  1 file changed, 1 insertion(+), 14 deletions(-)
> 
> diff --git a/drivers/watchdog/pic32-dmt.c b/drivers/watchdog/pic32-dmt.c
> index f43062b3c4c8..bc4ccddc75a3 100644
> --- a/drivers/watchdog/pic32-dmt.c
> +++ b/drivers/watchdog/pic32-dmt.c
> @@ -164,11 +164,6 @@ static struct watchdog_device pic32_dmt_wdd = {
>  	.ops		= &pic32_dmt_fops,
>  };
>  
> -static void pic32_clk_disable_unprepare(void *data)
> -{
> -	clk_disable_unprepare(data);
> -}
> -
>  static int pic32_dmt_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> @@ -184,20 +179,12 @@ static int pic32_dmt_probe(struct platform_device *pdev)
>  	if (IS_ERR(dmt->regs))
>  		return PTR_ERR(dmt->regs);
>  
> -	dmt->clk = devm_clk_get(dev, NULL);
> +	dmt->clk = devm_clk_get_enabled(dev, NULL);
>  	if (IS_ERR(dmt->clk)) {
>  		dev_err(dev, "clk not found\n");
>  		return PTR_ERR(dmt->clk);
>  	}
>  
> -	ret = clk_prepare_enable(dmt->clk);
> -	if (ret)
> -		return ret;
> -	ret = devm_add_action_or_reset(dev, pic32_clk_disable_unprepare,
> -				       dmt->clk);
> -	if (ret)
> -		return ret;
> -
>  	wdd->timeout = pic32_dmt_get_timeout_secs(dmt);
>  	if (!wdd->timeout) {
>  		dev_err(dev, "failed to read watchdog register timeout\n");
> -- 
> 2.34.1
>