Re: [PATCH v2] clk: palmas: Balance external-control clock prepare

[Brian Masney <bmasney@redhat.com>]

Hi Myeonghun,

On Wed, Jun 24, 2026 at 04:05:42PM +0900, Myeonghun Pak wrote:
> palmas_clks_init_configure() prepares the clock when an external control
> pin is configured.  The current driver only drops that prepare reference
> when external control configuration fails.
> 
> If provider registration fails after that point, or if the driver is later
> removed, the prepare reference remains held.
> 
> Use devm_add_action_or_reset() to manage the prepare reference.  Use
> devm_of_clk_add_hw_provider() to manage provider registration.  This
> balances the prepare reference on probe failure and driver removal.
> 
> Fixes: 942d1d674931 ("clk: Add driver for Palmas clk32kg and clk32kgaudio clocks")
> Co-developed-by: Ijae Kim <ae878000@gmail.com>
> Signed-off-by: Ijae Kim <ae878000@gmail.com>
> Signed-off-by: Myeonghun Pak <mhun512@gmail.com>

Please split these into two separate patches. Otherwise, it looks good
to me.

Brian


> ---
> Changes in v2:
> - Use devm_of_clk_add_hw_provider() for provider cleanup.
> - Manage the external-control clk_prepare() with devm_add_action_or_reset().
> - Remove the manual provider remove callback.
> 
>  drivers/clk/clk-palmas.c | 24 +++++++++++++++---------
>  1 file changed, 15 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/clk/clk-palmas.c b/drivers/clk/clk-palmas.c
> index 39049f62db..fdbf8445eb 100644
> --- a/drivers/clk/clk-palmas.c
> +++ b/drivers/clk/clk-palmas.c
> @@ -194,6 +194,13 @@ static void palmas_clks_get_clk_data(struct platform_device *pdev,
>  	cinfo->ext_control_pin = prop;
>  }
>  
> +static void palmas_clks_unprepare_ext_control(void *data)
> +{
> +	struct palmas_clock_info *cinfo = data;
> +
> +	clk_unprepare(cinfo->hw.clk);
> +}
> +
>  static int palmas_clks_init_configure(struct palmas_clock_info *cinfo)
>  {
>  	int ret;
> @@ -214,13 +221,18 @@ static int palmas_clks_init_configure(struct palmas_clock_info *cinfo)
>  			return ret;
>  		}
>  
> +		ret = devm_add_action_or_reset(cinfo->dev,
> +					       palmas_clks_unprepare_ext_control,
> +					       cinfo);
> +		if (ret)
> +			return ret;
> +
>  		ret = palmas_ext_control_req_config(cinfo->palmas,
>  					cinfo->clk_desc->sleep_reqstr_id,
>  					cinfo->ext_control_pin, true);
>  		if (ret < 0) {
>  			dev_err(cinfo->dev, "Ext config for %s failed, %d\n",
>  				cinfo->clk_desc->clk_name, ret);
> -			clk_unprepare(cinfo->hw.clk);
>  			return ret;
>  		}
>  	}
> @@ -230,7 +242,6 @@ static int palmas_clks_init_configure(struct palmas_clock_info *cinfo)
>  static int palmas_clks_probe(struct platform_device *pdev)
>  {
>  	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
> -	struct device_node *node = pdev->dev.of_node;
>  	const struct palmas_clks_of_match_data *match_data;
>  	struct palmas_clock_info *cinfo;
>  	int ret;
> @@ -264,24 +275,19 @@ static int palmas_clks_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> -	ret = of_clk_add_hw_provider(node, of_clk_hw_simple_get, &cinfo->hw);
> +	ret = devm_of_clk_add_hw_provider(&pdev->dev, of_clk_hw_simple_get,
> +					  &cinfo->hw);
>  	if (ret < 0)
>  		dev_err(&pdev->dev, "Fail to add clock driver, %d\n", ret);
>  	return ret;
>  }
>  
> -static void palmas_clks_remove(struct platform_device *pdev)
> -{
> -	of_clk_del_provider(pdev->dev.of_node);
> -}
> -
>  static struct platform_driver palmas_clks_driver = {
>  	.driver = {
>  		.name = "palmas-clk",
>  		.of_match_table = palmas_clks_of_match,
>  	},
>  	.probe = palmas_clks_probe,
> -	.remove = palmas_clks_remove,
>  };
>  
>  module_platform_driver(palmas_clks_driver);
> -- 
> 2.47.1