firmware: arm_scmi: imx: Discover MISC board info from the system manager

The i.MX SCMI MISC protocol can report board information from the
System Manager (SM), including a board name and board-specific
attributes. Query this during protocol initialization.

If the firmware does not implement BOARD_INFO, handle -EOPNOTSUPP
gracefully and continue.

Reviewed-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Message-Id: <20250904-sm-misc-api-v1-v4-4-0bf10eaabdf1@nxp.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

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 a6d516182425b0b128269cd97f9adf5f32515b44..700a3f24f4efc153ca4a9ef1a9e50a7ece492a18 100644 (file)
--- a/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c
+++ b/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c
@@ -28,6 +28,7 @@ enum scmi_imx_misc_protocol_cmd {
        SCMI_IMX_MISC_DISCOVER_BUILD_INFO = 0x6,
        SCMI_IMX_MISC_CTRL_NOTIFY = 0x8,
        SCMI_IMX_MISC_CFG_INFO_GET = 0xC,
+       SCMI_IMX_MISC_BOARD_INFO = 0xE,
 };
 
 struct scmi_imx_misc_info {
@@ -76,6 +77,12 @@ struct scmi_imx_misc_buildinfo_out {
        u8 buildtime[MISC_MAX_BUILDTIME];
 };
 
+struct scmi_imx_misc_board_info_out {
+       __le32 attributes;
+#define MISC_MAX_BRDNAME       16
+       u8 brdname[MISC_MAX_BRDNAME];
+};
+
 struct scmi_imx_misc_cfg_info_out {
        __le32 msel;
 #define MISC_MAX_CFGNAME       16
@@ -316,6 +323,30 @@ static int scmi_imx_misc_build_info_discover(const struct scmi_protocol_handle *
        return ret;
 }
 
+static int scmi_imx_misc_board_info(const struct scmi_protocol_handle *ph)
+{
+       struct scmi_imx_misc_board_info_out *out;
+       char name[MISC_MAX_BRDNAME];
+       struct scmi_xfer *t;
+       int ret;
+
+       ret = ph->xops->xfer_get_init(ph, SCMI_IMX_MISC_BOARD_INFO, 0, sizeof(*out), &t);
+       if (ret)
+               return ret;
+
+       ret = ph->xops->do_xfer(ph, t);
+       if (!ret) {
+               out = t->rx.buf;
+               strscpy(name, out->brdname, MISC_MAX_BRDNAME);
+               dev_info(ph->dev, "Board\t\t= %s, attr=0x%08x\n",
+                        name, le32_to_cpu(out->attributes));
+       }
+
+       ph->xops->xfer_put(ph, t);
+
+       return ret;
+}
+
 static int scmi_imx_misc_cfg_info_get(const struct scmi_protocol_handle *ph)
 {
        struct scmi_imx_misc_cfg_info_out *out;
@@ -371,6 +402,10 @@ static int scmi_imx_misc_protocol_init(const struct scmi_protocol_handle *ph)
        if (ret && ret != -EOPNOTSUPP)
                return ret;
 
+       ret = scmi_imx_misc_board_info(ph);
+       if (ret && ret != -EOPNOTSUPP)
+               return ret;
+
        ret = scmi_imx_misc_cfg_info_get(ph);
        if (ret && ret != -EOPNOTSUPP)
                return ret;