soc: qcom: socinfo: Add support for new field in revision 17

Add support for new field coming with socinfo structure under v17 to get
hardware platform's oem variant id. This is to enable OEMs to have minor
changes in the board, but to use the same platform subtype as the one
supported by Qualcomm. The new field is to be used in platform overlay
file. Default value is 0, reserved for Qualcomm platforms. Also, add
debugfs support to read this field for a device.
Signed-off-by: Naman Jain <quic_namajain@quicinc.com>
Reviewed-by: Mukesh Ojha <quic_mojha@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230127041200.29094-1-quic_namajain@quicinc.com

drivers/soc/qcom/socinfo.c

@@ -174,6 +174,8 @@ struct socinfo {
 	__le32  pcode;
 	__le32  npartnamemap_offset;
 	__le32  nnum_partname_mapping;
+	/* Version 17 */
+	__le32 oem_variant;
 };
 
 #ifdef CONFIG_DEBUG_FS
@@ -196,6 +198,7 @@ struct socinfo_params {
 	u32 nmodem_supported;
 	u32 feature_code;
 	u32 pcode;
+	u32 oem_variant;
 };
 
 struct smem_image_version {
@@ -593,6 +596,11 @@ static void socinfo_debugfs_init(struct qcom_socinfo *qcom_socinfo,
 			   &qcom_socinfo->info.fmt);
 
 	switch (qcom_socinfo->info.fmt) {
+	case SOCINFO_VERSION(0, 17):
+		qcom_socinfo->info.oem_variant = __le32_to_cpu(info->oem_variant);
+		debugfs_create_u32("oem_variant", 0444, qcom_socinfo->dbg_root,
+				   &qcom_socinfo->info.oem_variant);
+		fallthrough;
 	case SOCINFO_VERSION(0, 16):
 		qcom_socinfo->info.feature_code = __le32_to_cpu(info->feature_code);
 		qcom_socinfo->info.pcode = __le32_to_cpu(info->pcode);