linux-kernel - Re: [PATCH V5 4/9] firmware: imx: scu: use soc name for soc

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Date:   Mon, 7 Aug 2023 10:51:53 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc:     s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com, aisheng.dong@....com,
        alexander.stein@...tq-group.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Peng Fan <peng.fan@....com>
Subject: Re: [PATCH V5 4/9] firmware: imx: scu: use soc name for soc_id

On Mon, Jul 31, 2023 at 05:04:44PM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
> 
> Same as soc-imx8m and soc-imx driver, use soc name for soc_id
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/firmware/imx/imx-scu-soc.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/firmware/imx/imx-scu-soc.c b/drivers/firmware/imx/imx-scu-soc.c
> index ef9103987e76..cb8377670a7d 100644
> --- a/drivers/firmware/imx/imx-scu-soc.c
> +++ b/drivers/firmware/imx/imx-scu-soc.c
> @@ -107,10 +107,12 @@ int imx_scu_soc_init(struct device *dev)
>  		return -EINVAL;
>  
>  	/* format soc_id value passed from SCU firmware */
> -	val = id & 0x1f;
> -	soc_dev_attr->soc_id = devm_kasprintf(dev, GFP_KERNEL, "0x%x", val);
> -	if (!soc_dev_attr->soc_id)
> -		return -ENOMEM;
> +	if (of_machine_is_compatible("fsl,imx8qm"))
> +		soc_dev_attr->soc_id = "i.MX8QM";
> +	else if (of_machine_is_compatible("fsl,imx8qxp"))
> +		soc_dev_attr->soc_id = "i.MX8QXP";
> +	else if (of_machine_is_compatible("fsl,imx8dxl"))
> +		soc_dev_attr->soc_id = "i.MX8DXL";

Is it possible to deduce SoC name from the id retrieved from SCU firmware?
IMO, device tree should be the last resort when there is no other
sources for the such information.

Shawn

>  
>  	/* format revision value passed from SCU firmware */
>  	val = (id >> 5) & 0xf;
> -- 
> 2.37.1
>