linux-kernel - Re: [PATCH 4/7] firmware: arm_scmi: imx: Support getting silicon info of MISC protocol

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Message-ID: <aF6YdPc6z21XNhWQ@pluto>
Date: Fri, 27 Jun 2025 14:11:16 +0100
From: Cristian Marussi <cristian.marussi@....com>
To: Peng Fan <peng.fan@....com>
Cc: Sudeep Holla <sudeep.holla@....com>,
	Cristian Marussi <cristian.marussi@....com>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, arm-scmi@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/7] firmware: arm_scmi: imx: Support getting silicon
 info of MISC protocol

On Fri, Jun 27, 2025 at 02:03:47PM +0800, Peng Fan wrote:
> MISC protocol supports getting the silicon information including revision
> number, part number and etc. Add the API for user to retrieve the
> information from SM.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  .../firmware/arm_scmi/vendors/imx/imx-sm-misc.c    | 34 ++++++++++++++++++++++
>  include/linux/scmi_imx_protocol.h                  |  8 +++++
>  2 files changed, 42 insertions(+)
> 
> diff --git a/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c b/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c
> index 8ce4bf92e6535af2f30d72a34717678613b35049..d5b24bc4d4ca6c19f4cddfaea6e9d9b32a4c92f7 100644
> --- a/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c
> +++ b/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c
> @@ -26,6 +26,7 @@ enum scmi_imx_misc_protocol_cmd {
>  	SCMI_IMX_MISC_CTRL_SET	= 0x3,
>  	SCMI_IMX_MISC_CTRL_GET	= 0x4,
>  	SCMI_IMX_MISC_DISCOVER_BUILDINFO = 0x6,
> +	SCMI_IMX_MISC_SI_INFO = 0xB,
>  	SCMI_IMX_MISC_CFG_INFO = 0xC,
>  	SCMI_IMX_MISC_CTRL_NOTIFY = 0x8,
>  };
> @@ -79,6 +80,13 @@ struct scmi_imx_misc_cfg_info_out {
>  	u8 cfgname[MISC_MAX_CFGNAME];
>  };
>  
> +struct scmi_imx_misc_si_info_out {
> +	__le32 deviceid;
> +	__le32 sirev;
> +	__le32 partnum;
> +	u8 siname[MISC_MAX_SINAME];
> +};
> +
>  static int scmi_imx_misc_attributes_get(const struct scmi_protocol_handle *ph,
>  					struct scmi_imx_misc_info *mi)
>  {
> @@ -335,12 +343,38 @@ static int scmi_imx_misc_cfg_info(const struct scmi_protocol_handle *ph,
>  	return ret;
>  }
>  
> +static int scmi_imx_misc_silicon_info(const struct scmi_protocol_handle *ph,
> +				      struct scmi_imx_misc_system_info *info)
> +{
> +	struct scmi_imx_misc_si_info_out *out;
> +	struct scmi_xfer *t;
> +	int ret;
> +
> +	ret = ph->xops->xfer_get_init(ph, SCMI_IMX_MISC_SI_INFO, 0, sizeof(*out), &t);
> +	if (ret)
> +		return ret;
> +
> +	ret = ph->xops->do_xfer(ph, t);
> +	if (!ret) {
> +		out = t->rx.buf;
> +		info->deviceid = le32_to_cpu(out->deviceid);
> +		info->sirev = le32_to_cpu(out->sirev);
> +		info->partnum = le32_to_cpu(out->partnum);
> +		strscpy(info->siname, out->siname, MISC_MAX_SINAME);
> +	}
> +
> +	ph->xops->xfer_put(ph, t);
> +
> +	return ret;
> +}
> +
>  static const struct scmi_imx_misc_proto_ops scmi_imx_misc_proto_ops = {
>  	.misc_cfg_info = scmi_imx_misc_cfg_info,
>  	.misc_ctrl_set = scmi_imx_misc_ctrl_set,
>  	.misc_ctrl_get = scmi_imx_misc_ctrl_get,
>  	.misc_ctrl_req_notify = scmi_imx_misc_ctrl_notify,
>  	.misc_discover_build_info = scmi_imx_discover_build_info,
> +	.misc_silicon_info = scmi_imx_misc_silicon_info,
>  };
>  
>  static int scmi_imx_misc_protocol_init(const struct scmi_protocol_handle *ph)
> diff --git a/include/linux/scmi_imx_protocol.h b/include/linux/scmi_imx_protocol.h
> index bb0c35b5d6705acddd6c83c31474482a2667b418..0e639dfb5d16e281e2ccf006a63694b316c431f4 100644
> --- a/include/linux/scmi_imx_protocol.h
> +++ b/include/linux/scmi_imx_protocol.h
> @@ -55,6 +55,7 @@ struct scmi_imx_misc_ctrl_notify_report {
>  #define MISC_MAX_BUILDDATE	16
>  #define MISC_MAX_BUILDTIME	16
>  #define MISC_MAX_CFGNAME	16
> +#define MISC_MAX_SINAME		16
>  
>  struct scmi_imx_misc_system_info {
>  	u32 buildnum;
> @@ -63,6 +64,11 @@ struct scmi_imx_misc_system_info {
>  	u8 time[MISC_MAX_BUILDTIME];
>  	u32 msel;
>  	u8 cfgname[MISC_MAX_CFGNAME];
> +	/* silicon */
> +	u32 deviceid;
> +	u32 sirev;
> +	u32 partnum;
> +	u8 siname[MISC_MAX_SINAME];
>  };

Same observation here...maybe embed a struct dedicated to this....BUT in
this case the silicon_info are NOT meant to change during a boot (and
even across a reboot really) so why a distinct command from build_info
since both infos has the same lifetime ? (I understand the quality of
the info returned is drastically different HW vs SW)

>  
>  struct scmi_imx_misc_proto_ops {
> @@ -76,6 +82,8 @@ struct scmi_imx_misc_proto_ops {
>  				    u32 ctrl_id, u32 evt_id, u32 flags);
>  	int (*misc_discover_build_info)(const struct scmi_protocol_handle *ph,
>  					struct scmi_imx_misc_system_info *info);
> +	int (*misc_silicon_info)(const struct scmi_protocol_handle *ph,
> +				 struct scmi_imx_misc_system_info *info);
>  };
>  
>  /* See LMM_ATTRIBUTES in imx95.rst */


Other than this, no strong opinion anyway.

Reviewed-by: Cristian Marussi <cristian.marussi@....com>

Thanks,
Cristian