Re: [PATCH 5/9] remoteproc: imx_rproc: make clk optional

From: Mathieu Poirier <mathieu.poirier@linaro.org>
To: "Peng Fan (OSS)" <peng.fan@oss.nxp.com>
Cc: bjorn.andersson@linaro.org, shawnguo@kernel.org,
	s.hauer@pengutronix.de, kernel@pengutronix.de,
	festevam@gmail.com, linux-imx@nxp.com,
	linux-remoteproc@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, Peng Fan <peng.fan@nxp.com>
Subject: Re: [PATCH 5/9] remoteproc: imx_rproc: make clk optional
Date: Tue, 18 Jan 2022 11:50:19 -0700	[thread overview]
Message-ID: <20220118185019.GG1119324@p14s> (raw)
In-Reply-To: <20220111033333.403448-8-peng.fan@oss.nxp.com>

On Tue, Jan 11, 2022 at 11:33:29AM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@nxp.com>
> 
> To i.MX8QXP/QM/ULP and i.MX7ULP, Mcore maybe out of control of Linux.
> And in such case, no need clk, so make clk optional with has_clk.
> 
> Signed-off-by: Peng Fan <peng.fan@nxp.com>
> ---
>  drivers/remoteproc/imx_rproc.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
> index 7b2578177ea8..0e99a3ca6fbc 100644
> --- a/drivers/remoteproc/imx_rproc.c
> +++ b/drivers/remoteproc/imx_rproc.c
> @@ -89,6 +89,7 @@ struct imx_rproc {
>  	struct work_struct		rproc_work;
>  	struct workqueue_struct		*workqueue;
>  	void __iomem			*rsc_table;
> +	bool				has_clk;

I am usually weary of bloating structures with flags.  I suggest achieving the
same functionality with a macro that compares priv->dcfg with the right
imx_rproc_dcfg structure. 

>  };
>  
>  static const struct imx_rproc_att imx_rproc_att_imx8mn[] = {
> @@ -724,6 +725,9 @@ static int imx_rproc_clk_enable(struct imx_rproc *priv)
>  	if (dcfg->method == IMX_RPROC_NONE)
>  		return 0;
>  
> +	if (!priv->has_clk)
> +		return 0;
> +
>  	priv->clk = devm_clk_get(dev, NULL);
>  	if (IS_ERR(priv->clk)) {
>  		dev_err(dev, "Failed to get clock\n");
> @@ -768,6 +772,7 @@ static int imx_rproc_probe(struct platform_device *pdev)
>  	priv->rproc = rproc;
>  	priv->dcfg = dcfg;
>  	priv->dev = dev;
> +	priv->has_clk = true;
>  
>  	dev_set_drvdata(dev, rproc);
>  	priv->workqueue = create_workqueue(dev_name(dev));
> -- 
> 2.25.1
> 