[PATCH] watchdog: meson_gxbb: Use devm_clk_get_enabled() helper

[PATCH] watchdog: meson_gxbb: 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/meson_gxbb_wdt.c | 16 +---------------
 1 file changed, 1 insertion(+), 15 deletions(-)

diff --git a/drivers/watchdog/meson_gxbb_wdt.c b/drivers/watchdog/meson_gxbb_wdt.c
index 981a2f7c3bec..35d80cb39856 100644
--- a/drivers/watchdog/meson_gxbb_wdt.c
+++ b/drivers/watchdog/meson_gxbb_wdt.c
@@ -146,16 +146,10 @@ static const struct of_device_id meson_gxbb_wdt_dt_ids[] = {
 };
 MODULE_DEVICE_TABLE(of, meson_gxbb_wdt_dt_ids);
 
-static void meson_clk_disable_unprepare(void *data)
-{
-	clk_disable_unprepare(data);
-}
-
 static int meson_gxbb_wdt_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct meson_gxbb_wdt *data;
-	int ret;
 	u32 ctrl_reg;
 
 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
@@ -166,18 +160,10 @@ static int meson_gxbb_wdt_probe(struct platform_device *pdev)
 	if (IS_ERR(data->reg_base))
 		return PTR_ERR(data->reg_base);
 
-	data->clk = devm_clk_get(dev, NULL);
+	data->clk = devm_clk_get_enabled(dev, NULL);
 	if (IS_ERR(data->clk))
 		return PTR_ERR(data->clk);
 
-	ret = clk_prepare_enable(data->clk);
-	if (ret)
-		return ret;
-	ret = devm_add_action_or_reset(dev, meson_clk_disable_unprepare,
-				       data->clk);
-	if (ret)
-		return ret;
-
 	platform_set_drvdata(pdev, data);
 
 	data->wdt_dev.parent = dev;
-- 
2.34.1

Re: [PATCH] watchdog: meson_gxbb: Use devm_clk_get_enabled() helper

[Guenter Roeck]

On Sat, Dec 31, 2022 at 01:34:44PM +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/meson_gxbb_wdt.c | 16 +---------------
>  1 file changed, 1 insertion(+), 15 deletions(-)
> 
> diff --git a/drivers/watchdog/meson_gxbb_wdt.c b/drivers/watchdog/meson_gxbb_wdt.c
> index 981a2f7c3bec..35d80cb39856 100644
> --- a/drivers/watchdog/meson_gxbb_wdt.c
> +++ b/drivers/watchdog/meson_gxbb_wdt.c
> @@ -146,16 +146,10 @@ static const struct of_device_id meson_gxbb_wdt_dt_ids[] = {
>  };
>  MODULE_DEVICE_TABLE(of, meson_gxbb_wdt_dt_ids);
>  
> -static void meson_clk_disable_unprepare(void *data)
> -{
> -	clk_disable_unprepare(data);
> -}
> -
>  static int meson_gxbb_wdt_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
>  	struct meson_gxbb_wdt *data;
> -	int ret;
>  	u32 ctrl_reg;
>  
>  	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> @@ -166,18 +160,10 @@ static int meson_gxbb_wdt_probe(struct platform_device *pdev)
>  	if (IS_ERR(data->reg_base))
>  		return PTR_ERR(data->reg_base);
>  
> -	data->clk = devm_clk_get(dev, NULL);
> +	data->clk = devm_clk_get_enabled(dev, NULL);
>  	if (IS_ERR(data->clk))
>  		return PTR_ERR(data->clk);
>  
> -	ret = clk_prepare_enable(data->clk);
> -	if (ret)
> -		return ret;
> -	ret = devm_add_action_or_reset(dev, meson_clk_disable_unprepare,
> -				       data->clk);
> -	if (ret)
> -		return ret;
> -
>  	platform_set_drvdata(pdev, data);
>  
>  	data->wdt_dev.parent = dev;
> -- 
> 2.34.1
> 

Re: [PATCH] watchdog: meson_gxbb: Use devm_clk_get_enabled() helper

[Martin Blumenstingl]

On Sat, Dec 31, 2022 at 1:34 PM Christophe JAILLET
<christophe.jaillet@wanadoo.fr> 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>
Thank you for this patch! It's:
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>