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/bcm7038_wdt.c | 15 +--------------
 1 file changed, 1 insertion(+), 14 deletions(-)

diff --git a/drivers/watchdog/bcm7038_wdt.c b/drivers/watchdog/bcm7038_wdt.c
index 9388838899ac..e038dd66b819 100644
--- a/drivers/watchdog/bcm7038_wdt.c
+++ b/drivers/watchdog/bcm7038_wdt.c
@@ -127,11 +127,6 @@ static const struct watchdog_ops bcm7038_wdt_ops = {
 	.get_timeleft	= bcm7038_wdt_get_timeleft,
 };
 
-static void bcm7038_clk_disable_unprepare(void *data)
-{
-	clk_disable_unprepare(data);
-}
-
 static int bcm7038_wdt_probe(struct platform_device *pdev)
 {
 	struct bcm7038_wdt_platform_data *pdata = pdev->dev.platform_data;
@@ -153,17 +148,9 @@ static int bcm7038_wdt_probe(struct platform_device *pdev)
 	if (pdata && pdata->clk_name)
 		clk_name = pdata->clk_name;
 
-	wdt->clk = devm_clk_get(dev, clk_name);
+	wdt->clk = devm_clk_get_enabled(dev, clk_name);
 	/* If unable to get clock, use default frequency */
 	if (!IS_ERR(wdt->clk)) {
-		err = clk_prepare_enable(wdt->clk);
-		if (err)
-			return err;
-		err = devm_add_action_or_reset(dev,
-					       bcm7038_clk_disable_unprepare,
-					       wdt->clk);
-		if (err)
-			return err;
 		wdt->rate = clk_get_rate(wdt->clk);
 		/* Prevent divide-by-zero exception */
 		if (!wdt->rate)
-- 
2.34.1

On Sat, Dec 31, 2022 at 09:10:17AM +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/bcm7038_wdt.c | 15 +--------------
>  1 file changed, 1 insertion(+), 14 deletions(-)
> 
> diff --git a/drivers/watchdog/bcm7038_wdt.c b/drivers/watchdog/bcm7038_wdt.c
> index 9388838899ac..e038dd66b819 100644
> --- a/drivers/watchdog/bcm7038_wdt.c
> +++ b/drivers/watchdog/bcm7038_wdt.c
> @@ -127,11 +127,6 @@ static const struct watchdog_ops bcm7038_wdt_ops = {
>  	.get_timeleft	= bcm7038_wdt_get_timeleft,
>  };
>  
> -static void bcm7038_clk_disable_unprepare(void *data)
> -{
> -	clk_disable_unprepare(data);
> -}
> -
>  static int bcm7038_wdt_probe(struct platform_device *pdev)
>  {
>  	struct bcm7038_wdt_platform_data *pdata = pdev->dev.platform_data;
> @@ -153,17 +148,9 @@ static int bcm7038_wdt_probe(struct platform_device *pdev)
>  	if (pdata && pdata->clk_name)
>  		clk_name = pdata->clk_name;
>  
> -	wdt->clk = devm_clk_get(dev, clk_name);
> +	wdt->clk = devm_clk_get_enabled(dev, clk_name);
>  	/* If unable to get clock, use default frequency */
>  	if (!IS_ERR(wdt->clk)) {
> -		err = clk_prepare_enable(wdt->clk);
> -		if (err)
> -			return err;
> -		err = devm_add_action_or_reset(dev,
> -					       bcm7038_clk_disable_unprepare,
> -					       wdt->clk);
> -		if (err)
> -			return err;
>  		wdt->rate = clk_get_rate(wdt->clk);
>  		/* Prevent divide-by-zero exception */
>  		if (!wdt->rate)
> -- 
> 2.34.1
>

On 12/31/2022 12:10 AM, 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>

Acked-by: Florian Fainelli <f.fainelli@gmail.com>
-- 
Florian