MISC protocol supports discovering the System Manager(SM) build
information including build commit, build time and etc. Retrieve the
information from SM.

Reviewed-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 .../firmware/arm_scmi/vendors/imx/imx-sm-misc.c    | 41 ++++++++++++++++++++++
 1 file changed, 41 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 a8915d3b4df518719d56bfff38922625ad9b70f6..c2928bc89b001b288ee64565cec9da5668b56e7e 100644
--- a/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c
+++ b/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c
@@ -25,6 +25,7 @@
 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_CTRL_NOTIFY = 0x8,
 };
 
@@ -65,6 +66,15 @@ struct scmi_imx_misc_ctrl_get_out {
 	__le32 val[];
 };
 
+struct scmi_imx_misc_buildinfo_out {
+	__le32 buildnum;
+	__le32 buildcommit;
+#define MISC_MAX_BUILDDATE	16
+	u8 builddate[MISC_MAX_BUILDDATE];
+#define MISC_MAX_BUILDTIME	16
+	u8 buildtime[MISC_MAX_BUILDTIME];
+};
+
 static int scmi_imx_misc_attributes_get(const struct scmi_protocol_handle *ph,
 					struct scmi_imx_misc_info *mi)
 {
@@ -272,6 +282,33 @@ static int scmi_imx_misc_ctrl_set(const struct scmi_protocol_handle *ph,
 	return ret;
 }
 
+static int scmi_imx_misc_build_info_discover(const struct scmi_protocol_handle *ph)
+{
+	char date[MISC_MAX_BUILDDATE], time[MISC_MAX_BUILDTIME];
+	struct scmi_imx_misc_buildinfo_out *out;
+	struct scmi_xfer *t;
+	int ret;
+
+	ret = ph->xops->xfer_get_init(ph, SCMI_IMX_MISC_DISCOVER_BUILDINFO, 0,
+				      sizeof(*out), &t);
+	if (ret)
+		return ret;
+
+	ret = ph->xops->do_xfer(ph, t);
+	if (!ret) {
+		out = t->rx.buf;
+		strscpy(date, out->builddate, MISC_MAX_BUILDDATE);
+		strscpy(time, out->buildtime, MISC_MAX_BUILDTIME);
+		dev_info(ph->dev, "SM Version\t= Build %u, Commit %08x %s %s\n",
+			 le32_to_cpu(out->buildnum), le32_to_cpu(out->buildcommit),
+			 date, time);
+	}
+
+	ph->xops->xfer_put(ph, t);
+
+	return ret;
+}
+
 static const struct scmi_imx_misc_proto_ops scmi_imx_misc_proto_ops = {
 	.misc_ctrl_set = scmi_imx_misc_ctrl_set,
 	.misc_ctrl_get = scmi_imx_misc_ctrl_get,
@@ -299,6 +336,10 @@ static int scmi_imx_misc_protocol_init(const struct scmi_protocol_handle *ph)
 	if (ret)
 		return ret;
 
+	ret = scmi_imx_misc_build_info_discover(ph);
+	if (ret && ret != -EOPNOTSUPP)
+		return ret;
+
 	return ph->set_priv(ph, minfo, version);
 }
 

-- 
2.37.1