diff --git a/plat/intel/soc/common/include/socfpga_mailbox.h b/plat/intel/soc/common/include/socfpga_mailbox.h
index 09dd117..b260a62 100644
--- a/plat/intel/soc/common/include/socfpga_mailbox.h
+++ b/plat/intel/soc/common/include/socfpga_mailbox.h
@@ -51,6 +51,11 @@
 #define MBOX_RECONFIG_DATA		0x08
 #define MBOX_RECONFIG_STATUS		0x09
 
+/* HWMON Commands */
+#define MBOX_HWMON_READVOLT		0x18
+#define MBOX_HWMON_READTEMP		0x19
+
+
 /* QSPI Commands */
 #define MBOX_CMD_QSPI_OPEN		0x32
 #define MBOX_CMD_QSPI_CLOSE		0x33
@@ -178,5 +183,7 @@
 int mailbox_rsu_status(uint32_t *resp_buf, uint32_t resp_buf_len);
 int mailbox_rsu_update(uint32_t *flash_offset);
 int mailbox_hps_stage_notify(uint32_t execution_stage);
+int mailbox_hwmon_readtemp(uint32_t chan, uint32_t *resp_buf);
+int mailbox_hwmon_readvolt(uint32_t chan, uint32_t *resp_buf);
 
 #endif /* SOCFPGA_MBOX_H */
diff --git a/plat/intel/soc/common/include/socfpga_sip_svc.h b/plat/intel/soc/common/include/socfpga_sip_svc.h
index 0f3cc09..43f3dc4 100644
--- a/plat/intel/soc/common/include/socfpga_sip_svc.h
+++ b/plat/intel/soc/common/include/socfpga_sip_svc.h
@@ -50,6 +50,11 @@
 #define INTEL_SIP_SMC_RSU_DCMF_STATUS			0xC2000014
 #define INTEL_SIP_SMC_RSU_COPY_DCMF_STATUS		0xC2000015
 
+/* Hardware monitor */
+#define INTEL_SIP_SMC_HWMON_READTEMP			0xC2000020
+#define INTEL_SIP_SMC_HWMON_READVOLT			0xC2000021
+#define TEMP_CHANNEL_MAX				(1 << 15)
+#define VOLT_CHANNEL_MAX				(1 << 15)
 
 /* ECC */
 #define INTEL_SIP_SMC_ECC_DBE				0xC200000D