linux-kernel - Re: [PATCH V4 6/8] remoteproc: imx

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Message-ID: <20210416174622.GC1050209@xps15>
Date:   Fri, 16 Apr 2021 11:46:22 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     peng.fan@....nxp.com
Cc:     ohad@...ery.com, bjorn.andersson@...aro.org,
        o.rempel@...gutronix.de, robh+dt@...nel.org,
        devicetree@...r.kernel.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-remoteproc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Peng Fan <peng.fan@....com>
Subject: Re: [PATCH V4 6/8] remoteproc: imx_rproc: make clk optional

On Thu, Apr 15, 2021 at 09:27:39PM +0800, peng.fan@....nxp.com wrote:
> From: Peng Fan <peng.fan@....com>
> 
> To i.MX7ULP, M4 is the master to control everything, no need to provide
> clk from Linux side. So make clk optional when method is IMX_RPROC_NONE.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/remoteproc/imx_rproc.c | 46 ++++++++++++++++++++++++++++--------------
>  1 file changed, 31 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
> index 2b633fd..56dfcc1 100644
> --- a/drivers/remoteproc/imx_rproc.c
> +++ b/drivers/remoteproc/imx_rproc.c
> @@ -606,6 +606,35 @@ static int imx_rproc_detect_mode(struct imx_rproc *priv)
>  	return 0;
>  }
>  
> +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 */
> +	if (dcfg->method == IMX_RPROC_NONE)
> +		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) {
> +		dev_err(dev, "Failed to enable clock\n");
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
>  static int imx_rproc_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> @@ -654,22 +683,9 @@ static int imx_rproc_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto err_put_mbox;
>  
> -	priv->clk = devm_clk_get(dev, NULL);
> -	if (IS_ERR(priv->clk)) {
> -		dev_err(dev, "Failed to get clock\n");
> -		ret = PTR_ERR(priv->clk);
> -		goto err_put_mbox;
> -	}
> -
> -	/*
> -	 * clk for M4 block including memory. Should be
> -	 * enabled before .start for FW transfer.
> -	 */
> -	ret = clk_prepare_enable(priv->clk);
> -	if (ret) {
> -		dev_err(&rproc->dev, "Failed to enable clock\n");
> +	ret = imx_rproc_clk_enable(priv);
> +	if (ret)

Much better

Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>

>  		goto err_put_mbox;
> -	}
>  
>  	INIT_WORK(&priv->rproc_work, imx_rproc_vq_work);
>  
> -- 
> 2.7.4
>