linux-kernel - Re: [PATCH 4/6] remoteproc: imx_rproc: Use devm_clk_get

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Message-ID: <aNF8GgKGvokLq0mf@p14s>
Date: Mon, 22 Sep 2025 10:40:58 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Peng Fan <peng.fan@....com>
Cc: Bjorn Andersson <andersson@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Hiago De Franco <hiago.franco@...adex.com>,
	linux-remoteproc@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] remoteproc: imx_rproc: Use devm_clk_get_enabled()
 and simplify cleanup

On Wed, Sep 17, 2025 at 09:19:16PM +0800, Peng Fan wrote:
> Replace separate calls to devm_clk_get() and clk_prepare_enable() with
> devm_clk_get_enabled(), which combines clock acquisition and enabling
> into a single managed step. Simplify the probe logic and remove the need
> for manual clock disable in error and remove paths.
> 
> Also, update error handling to eliminate redundant cleanup steps and use
> return-based error propagation where appropriate. Improve code clarity and
> reduce the chance of resource leaks or incorrect ordering in cleanup paths.
> 
> No functional changes.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/remoteproc/imx_rproc.c | 28 +++++++++-------------------
>  1 file changed, 9 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
> index e30b61ee39dacc88f9e938f8c6ffe61fef63dbda..c6cfb308ddb376f370fd4492f8a84f734602bac8 100644
> --- a/drivers/remoteproc/imx_rproc.c
> +++ b/drivers/remoteproc/imx_rproc.c
> @@ -1006,26 +1006,19 @@ static int imx_rproc_clk_enable(struct imx_rproc *priv)
>  {
>  	const struct imx_rproc_dcfg *dcfg = priv->dcfg;
>  	struct device *dev = priv->dev;
> -	int ret;
>  
>  	/* Remote core is not under control of Linux or it is managed by SCU API */
>  	if (dcfg->method == IMX_RPROC_NONE || dcfg->method == IMX_RPROC_SCU_API)
>  		return 0;
>  
> -	priv->clk = devm_clk_get(dev, NULL);
> -	if (IS_ERR(priv->clk)) {
> -		dev_err(dev, "Failed to get clock\n");
> -		return PTR_ERR(priv->clk);
> -	}
> -
>  	/*
>  	 * clk for M4 block including memory. Should be
>  	 * enabled before .start for FW transfer.
>  	 */
> -	ret = clk_prepare_enable(priv->clk);
> -	if (ret) {
> +	priv->clk = devm_clk_get_enabled(dev, NULL);
> +	if (IS_ERR(priv->clk)) {
>  		dev_err(dev, "Failed to enable clock\n");
> -		return ret;
> +		return PTR_ERR(priv->clk);
>  	}
>  
>  	return 0;
> @@ -1134,7 +1127,7 @@ static int imx_rproc_probe(struct platform_device *pdev)
>  						    imx_rproc_sys_off_handler, rproc);
>  		if (ret) {
>  			dev_err(dev, "register power off handler failure\n");
> -			goto err_put_clk;
> +			goto err_put_scu;
>  		}
>  
>  		ret = devm_register_sys_off_handler(dev, SYS_OFF_MODE_RESTART_PREPARE,
> @@ -1142,7 +1135,7 @@ static int imx_rproc_probe(struct platform_device *pdev)
>  						    imx_rproc_sys_off_handler, rproc);
>  		if (ret) {
>  			dev_err(dev, "register restart handler failure\n");
> -			goto err_put_clk;
> +			goto err_put_scu;
>  		}
>  	}
>  
> @@ -1150,32 +1143,30 @@ static int imx_rproc_probe(struct platform_device *pdev)
>  		ret = devm_pm_runtime_enable(dev);
>  		if (ret) {
>  			dev_err(dev, "Failed to enable runtime PM, %d\n", ret);
> -			goto err_put_clk;
> +			goto err_put_scu;
>  		}
>  
>  		ret = pm_runtime_resume_and_get(dev);
>  		if (ret) {
>  			dev_err(dev, "pm_runtime get failed: %d\n", ret);
> -			goto err_put_clk;
> +			goto err_put_scu;
>  		}
>  
>  		ret = devm_add_action_or_reset(dev, imx_rproc_pm_runtime_put, dev);
>  		if (ret) {
>  			dev_err(dev, "Failed to add devm disable pm action: %d\n", ret);
> -			goto err_put_clk;
> +			goto err_put_scu;
>  		}
>  	}
>  
>  	ret = rproc_add(rproc);
>  	if (ret) {
>  		dev_err(dev, "rproc_add failed\n");
> -		goto err_put_clk;
> +		goto err_put_scu;
>  	}
>  
>  	return 0;
>  
> -err_put_clk:
> -	clk_disable_unprepare(priv->clk);
>  err_put_scu:
>  	imx_rproc_put_scu(rproc);
>  
> @@ -1187,7 +1178,6 @@ static void imx_rproc_remove(struct platform_device *pdev)
>  	struct rproc *rproc = platform_get_drvdata(pdev);
>  	struct imx_rproc *priv = rproc->priv;
>  
> -	clk_disable_unprepare(priv->clk);

/home/mpoirier/work/remoteproc/kernel/drivers/remoteproc/imx_rproc.c: In
function ‘imx_rproc_remove’:
/home/mpoirier/work/remoteproc/kernel/drivers/remoteproc/imx_rproc.c:1179:27:
warning: unused variable ‘priv’ [-Wunused-variable]
 1179 |         struct imx_rproc *priv = rproc->priv;
      |                           ^~~~
  AR      drivers/remoteproc/built-in.a
  AR      drivers/built-in.a
  AR      kernel/module/built-in.a
  AR      kernel/built-in.a

>  	rproc_del(rproc);
>  	imx_rproc_put_scu(rproc);
>  }
> 
> -- 
> 2.37.1
>