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

Cristian Marussi
2025-06-27T13:11:22Z

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@nxp.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@arm.com>

Thanks,
Cristian