diff --git a/plat/socionext/synquacer/drivers/scp/sq_scmi.c b/plat/socionext/synquacer/drivers/scp/sq_scmi.c
new file mode 100644
index 0000000..e2013cc
--- /dev/null
+++ b/plat/socionext/synquacer/drivers/scp/sq_scmi.c
@@ -0,0 +1,239 @@
+/*
+ * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <string.h>
+
+#include <arch_helpers.h>
+#include <common/debug.h>
+#include <drivers/arm/css/css_mhu_doorbell.h>
+#include <drivers/arm/css/css_scp.h>
+#include <drivers/arm/css/scmi.h>
+#include <plat/arm/css/common/css_pm.h>
+#include <plat/common/platform.h>
+#include <platform_def.h>
+
+#include <scmi_sq.h>
+#include <sq_common.h>
+
+/*
+ * This file implements the SCP helper functions using SCMI protocol.
+ */
+
+DEFINE_BAKERY_LOCK(sq_scmi_lock);
+#define SQ_SCMI_LOCK_GET_INSTANCE	(&sq_scmi_lock)
+
+#define SQ_SCMI_PAYLOAD_BASE		PLAT_SQ_SCP_COM_SHARED_MEM_BASE
+#define MHU_CPU_INTR_S_SET_OFFSET	0x308
+
+const uint32_t sq_core_pos_to_scmi_dmn_id_map[PLATFORM_CORE_COUNT] = {
+	0,   1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
+	12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23
+};
+
+static scmi_channel_plat_info_t sq_scmi_plat_info = {
+		.scmi_mbx_mem = SQ_SCMI_PAYLOAD_BASE,
+		.db_reg_addr = PLAT_SQ_MHU_BASE + MHU_CPU_INTR_S_SET_OFFSET,
+		.db_preserve_mask = 0xfffffffe,
+		.db_modify_mask = 0x1,
+		.ring_doorbell = &mhu_ring_doorbell,
+};
+
+/*
+ * SCMI power state parameter bit field encoding for SynQuacer platform.
+ *
+ * 31  20 19       16 15      12 11       8 7        4 3         0
+ * +-------------------------------------------------------------+
+ * | SBZ | Max level |  Level 3 |  Level 2 |  Level 1 |  Level 0 |
+ * |     |           |   state  |   state  |   state  |   state  |
+ * +-------------------------------------------------------------+
+ *
+ * `Max level` encodes the highest level that has a valid power state
+ * encoded in the power state.
+ */
+#define SCMI_PWR_STATE_MAX_PWR_LVL_SHIFT	16
+#define SCMI_PWR_STATE_MAX_PWR_LVL_WIDTH	4
+#define SCMI_PWR_STATE_MAX_PWR_LVL_MASK		\
+				((1 << SCMI_PWR_STATE_MAX_PWR_LVL_WIDTH) - 1)
+#define SCMI_SET_PWR_STATE_MAX_PWR_LVL(_power_state, _max_level)		\
+		(_power_state) |= ((_max_level) & SCMI_PWR_STATE_MAX_PWR_LVL_MASK)\
+				<< SCMI_PWR_STATE_MAX_PWR_LVL_SHIFT
+#define SCMI_GET_PWR_STATE_MAX_PWR_LVL(_power_state)		\
+		(((_power_state) >> SCMI_PWR_STATE_MAX_PWR_LVL_SHIFT)	\
+				& SCMI_PWR_STATE_MAX_PWR_LVL_MASK)
+
+#define SCMI_PWR_STATE_LVL_WIDTH		4
+#define SCMI_PWR_STATE_LVL_MASK			\
+				((1 << SCMI_PWR_STATE_LVL_WIDTH) - 1)
+#define SCMI_SET_PWR_STATE_LVL(_power_state, _level, _level_state)		\
+		(_power_state) |= ((_level_state) & SCMI_PWR_STATE_LVL_MASK)	\
+				<< (SCMI_PWR_STATE_LVL_WIDTH * (_level))
+#define SCMI_GET_PWR_STATE_LVL(_power_state, _level)		\
+		(((_power_state) >> (SCMI_PWR_STATE_LVL_WIDTH * (_level))) &	\
+				SCMI_PWR_STATE_LVL_MASK)
+
+/*
+ * The SCMI power state enumeration for a power domain level
+ */
+typedef enum {
+	scmi_power_state_off = 0,
+	scmi_power_state_on = 1,
+	scmi_power_state_sleep = 2,
+} scmi_power_state_t;
+
+/*
+ * The global handle for invoking the SCMI driver APIs after the driver
+ * has been initialized.
+ */
+static void *sq_scmi_handle;
+
+/* The SCMI channel global object */
+static scmi_channel_t channel;
+
+/*
+ * Helper function to turn off a CPU power domain and
+ * its parent power domains if applicable.
+ */
+void sq_scmi_off(const struct psci_power_state *target_state)
+{
+	int lvl = 0, ret;
+	uint32_t scmi_pwr_state = 0;
+
+	/* At-least the CPU level should be specified to be OFF */
+	assert(target_state->pwr_domain_state[SQ_PWR_LVL0] ==
+							SQ_LOCAL_STATE_OFF);
+
+	for (; lvl <= PLAT_MAX_PWR_LVL; lvl++) {
+		if (target_state->pwr_domain_state[lvl] == SQ_LOCAL_STATE_RUN)
+			break;
+
+		assert(target_state->pwr_domain_state[lvl] ==
+							SQ_LOCAL_STATE_OFF);
+		SCMI_SET_PWR_STATE_LVL(scmi_pwr_state, lvl,
+				scmi_power_state_off);
+	}
+
+	SCMI_SET_PWR_STATE_MAX_PWR_LVL(scmi_pwr_state, lvl - 1);
+
+	ret = scmi_pwr_state_set(sq_scmi_handle,
+		sq_core_pos_to_scmi_dmn_id_map[plat_my_core_pos()],
+		scmi_pwr_state);
+
+	if (ret != SCMI_E_QUEUED && ret != SCMI_E_SUCCESS) {
+		ERROR("SCMI set power state command return 0x%x unexpected\n",
+				ret);
+		panic();
+	}
+}
+
+/*
+ * Helper function to turn ON a CPU power domain and
+ *its parent power domains if applicable.
+ */
+void sq_scmi_on(u_register_t mpidr)
+{
+	int lvl = 0, ret, core_pos;
+	uint32_t scmi_pwr_state = 0;
+
+	for (; lvl <= PLAT_MAX_PWR_LVL; lvl++)
+		SCMI_SET_PWR_STATE_LVL(scmi_pwr_state, lvl,
+				scmi_power_state_on);
+
+	SCMI_SET_PWR_STATE_MAX_PWR_LVL(scmi_pwr_state, lvl - 1);
+
+	core_pos = plat_core_pos_by_mpidr(mpidr);
+	assert(core_pos >= 0 && core_pos < PLATFORM_CORE_COUNT);
+
+	ret = scmi_pwr_state_set(sq_scmi_handle,
+		sq_core_pos_to_scmi_dmn_id_map[core_pos],
+		scmi_pwr_state);
+
+	if (ret != SCMI_E_QUEUED && ret != SCMI_E_SUCCESS) {
+		ERROR("SCMI set power state command return 0x%x unexpected\n",
+				ret);
+		panic();
+	}
+}
+
+void __dead2 sq_scmi_system_off(int state)
+{
+	int ret;
+
+	/*
+	 * Disable GIC CPU interface to prevent pending interrupt from waking
+	 * up the AP from WFI.
+	 */
+	sq_gic_cpuif_disable();
+
+	/*
+	 * Issue SCMI command. First issue a graceful
+	 * request and if that fails force the request.
+	 */
+	ret = scmi_sys_pwr_state_set(sq_scmi_handle,
+			SCMI_SYS_PWR_FORCEFUL_REQ,
+			state);
+
+	if (ret != SCMI_E_SUCCESS) {
+		ERROR("SCMI system power state set 0x%x returns unexpected 0x%x\n",
+			state, ret);
+		panic();
+	}
+	wfi();
+	ERROR("SCMI set power state: operation not handled.\n");
+	panic();
+}
+
+/*
+ * Helper function to reset the system via SCMI.
+ */
+void __dead2 sq_scmi_sys_reboot(void)
+{
+	sq_scmi_system_off(SCMI_SYS_PWR_COLD_RESET);
+}
+
+static int scmi_ap_core_init(scmi_channel_t *ch)
+{
+#if PROGRAMMABLE_RESET_ADDRESS
+	uint32_t version;
+	int ret;
+
+	ret = scmi_proto_version(ch, SCMI_AP_CORE_PROTO_ID, &version);
+	if (ret != SCMI_E_SUCCESS) {
+		WARN("SCMI AP core protocol version message failed\n");
+		return -1;
+	}
+
+	if (!is_scmi_version_compatible(SCMI_AP_CORE_PROTO_VER, version)) {
+		WARN("SCMI AP core protocol version 0x%x incompatible with driver version 0x%x\n",
+						version, SCMI_AP_CORE_PROTO_VER);
+		return -1;
+	}
+	INFO("SCMI AP core protocol version 0x%x detected\n", version);
+#endif
+	return 0;
+}
+
+void __init plat_sq_pwrc_setup(void)
+{
+	channel.info = &sq_scmi_plat_info;
+	channel.lock = SQ_SCMI_LOCK_GET_INSTANCE;
+	sq_scmi_handle = scmi_init(&channel);
+	if (sq_scmi_handle == NULL) {
+		ERROR("SCMI Initialization failed\n");
+		panic();
+	}
+	if (scmi_ap_core_init(&channel) < 0) {
+		ERROR("SCMI AP core protocol initialization failed\n");
+		panic();
+	}
+}
+
+uint32_t sq_scmi_get_draminfo(struct draminfo *info)
+{
+	scmi_get_draminfo(sq_scmi_handle, info);
+
+	return 0;
+}
diff --git a/plat/socionext/synquacer/drivers/scp/sq_scp.c b/plat/socionext/synquacer/drivers/scp/sq_scp.c
new file mode 100644
index 0000000..e494022
--- /dev/null
+++ b/plat/socionext/synquacer/drivers/scp/sq_scp.c
@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <sq_common.h>
+#include "sq_scpi.h"
+
+/*
+ * Helper function to get dram information from SCP.
+ */
+uint32_t sq_scp_get_draminfo(struct draminfo *info)
+{
+#if SQ_USE_SCMI_DRIVER
+	sq_scmi_get_draminfo(info);
+#else
+	scpi_get_draminfo(info);
+#endif
+	return 0;
+}
diff --git a/plat/socionext/synquacer/drivers/scpi/sq_scpi.h b/plat/socionext/synquacer/drivers/scpi/sq_scpi.h
index 38cc19e..eb6ce5c 100644
--- a/plat/socionext/synquacer/drivers/scpi/sq_scpi.h
+++ b/plat/socionext/synquacer/drivers/scpi/sq_scpi.h
@@ -78,5 +78,6 @@
 					scpi_power_state_t cluster_state,
 					scpi_power_state_t css_state);
 uint32_t scpi_sys_power_state(scpi_system_state_t system_state);
+uint32_t scpi_get_draminfo(struct draminfo *info);
 
 #endif /* SQ_SCPI_H */
diff --git a/plat/socionext/synquacer/include/platform_def.h b/plat/socionext/synquacer/include/platform_def.h
index 0cec81b..263b215 100644
--- a/plat/socionext/synquacer/include/platform_def.h
+++ b/plat/socionext/synquacer/include/platform_def.h
@@ -16,6 +16,16 @@
 #define PLATFORM_CORE_COUNT		(PLAT_CLUSTER_COUNT *	\
 					 PLAT_MAX_CORES_PER_CLUSTER)
 
+/* Macros to read the SQ power domain state */
+#define SQ_PWR_LVL0		MPIDR_AFFLVL0
+#define SQ_PWR_LVL1		MPIDR_AFFLVL1
+#define SQ_PWR_LVL2		MPIDR_AFFLVL2
+
+#define SQ_CORE_PWR_STATE(state)	(state)->pwr_domain_state[SQ_PWR_LVL0]
+#define SQ_CLUSTER_PWR_STATE(state)	(state)->pwr_domain_state[SQ_PWR_LVL1]
+#define SQ_SYSTEM_PWR_STATE(state)	((PLAT_MAX_PWR_LVL > SQ_PWR_LVL1) ?\
+				(state)->pwr_domain_state[SQ_PWR_LVL2] : 0)
+
 #define PLAT_MAX_PWR_LVL		U(1)
 #define PLAT_MAX_RET_STATE		U(1)
 #define PLAT_MAX_OFF_STATE		U(2)
@@ -70,6 +80,7 @@
 #define DRAMINFO_BASE			0x2E00FFC0
 
 #define PLAT_SQ_MHU_BASE		0x45000000
+#define PLAT_CSS_MHU_BASE		PLAT_SQ_MHU_BASE
 
 #define PLAT_SQ_SCP_COM_SHARED_MEM_BASE		0x45400000
 #define SCPI_CMD_GET_DRAMINFO			0x1
diff --git a/plat/socionext/synquacer/include/sq_common.h b/plat/socionext/synquacer/include/sq_common.h
index abd9090..a985822 100644
--- a/plat/socionext/synquacer/include/sq_common.h
+++ b/plat/socionext/synquacer/include/sq_common.h
@@ -9,6 +9,7 @@
 
 #include <stdint.h>
 
+#include <lib/psci/psci.h>
 #include <lib/xlat_tables/xlat_tables_v2.h>
 
 struct draminfo {
@@ -22,7 +23,7 @@
 	uint64_t	size3;
 };
 
-uint32_t scpi_get_draminfo(struct draminfo *info);
+uint32_t sq_scp_get_draminfo(struct draminfo *info);
 
 void plat_sq_pwrc_setup(void);
 
@@ -41,4 +42,12 @@
 void sq_mmap_setup(uintptr_t total_base, size_t total_size,
 		   const struct mmap_region *mmap);
 
+/* SCMI API for power management by SCP */
+void sq_scmi_off(const struct psci_power_state *target_state);
+void sq_scmi_on(u_register_t mpidr);
+void __dead2 sq_scmi_sys_reboot(void);
+void __dead2 sq_scmi_system_off(int state);
+/* SCMI API for vendor specific protocol */
+uint32_t sq_scmi_get_draminfo(struct draminfo *info);
+
 #endif /* SQ_COMMON_H */
diff --git a/plat/socionext/synquacer/platform.mk b/plat/socionext/synquacer/platform.mk
index 53c39a0..f5e72cb 100644
--- a/plat/socionext/synquacer/platform.mk
+++ b/plat/socionext/synquacer/platform.mk
@@ -10,9 +10,10 @@
 override USE_COHERENT_MEM		:= 1
 override SEPARATE_CODE_AND_RODATA	:= 1
 override ENABLE_SVE_FOR_NS		:= 0
-
 # Enable workarounds for selected Cortex-A53 erratas.
 ERRATA_A53_855873		:= 1
+# Enable SCMI support
+SQ_USE_SCMI_DRIVER		?= 0
 
 # Libraries
 include lib/xlat_tables_v2/xlat_tables.mk
@@ -20,7 +21,9 @@
 PLAT_PATH		:=	plat/socionext/synquacer
 PLAT_INCLUDES		:=	-I$(PLAT_PATH)/include		\
 				-I$(PLAT_PATH)/drivers/scpi	\
-				-I$(PLAT_PATH)/drivers/mhu
+				-I$(PLAT_PATH)/drivers/mhu \
+				-Idrivers/arm/css/scmi \
+				-Idrivers/arm/css/scmi/vendor
 
 PLAT_BL_COMMON_SOURCES	+=	$(PLAT_PATH)/sq_helpers.S		\
 				drivers/arm/pl011/aarch64/pl011_console.S \
@@ -40,12 +43,27 @@
 				$(PLAT_PATH)/sq_topology.c		\
 				$(PLAT_PATH)/sq_psci.c			\
 				$(PLAT_PATH)/sq_gicv3.c			\
-				$(PLAT_PATH)/sq_xlat_setup.c		\
-				$(PLAT_PATH)/drivers/scpi/sq_scpi.c	\
+				$(PLAT_PATH)/sq_xlat_setup.c	\
+				$(PLAT_PATH)/drivers/scp/sq_scp.c
+
+ifeq (${SQ_USE_SCMI_DRIVER},0)
+BL31_SOURCES		+=	$(PLAT_PATH)/drivers/scpi/sq_scpi.c	\
 				$(PLAT_PATH)/drivers/mhu/sq_mhu.c
+else
+BL31_SOURCES		+=	$(PLAT_PATH)/drivers/scp/sq_scmi.c		\
+				drivers/arm/css/scmi/scmi_common.c		\
+				drivers/arm/css/scmi/scmi_pwr_dmn_proto.c	\
+				drivers/arm/css/scmi/scmi_sys_pwr_proto.c	\
+				drivers/arm/css/scmi/vendor/scmi_sq.c	\
+				drivers/arm/css/mhu/css_mhu_doorbell.c
+endif
 
 ifeq (${ENABLE_SPM},1)
 $(eval $(call add_define,PLAT_EXTRA_LD_SCRIPT))
 
 BL31_SOURCES		+=	$(PLAT_PATH)/sq_spm.c
 endif
+
+ifeq (${SQ_USE_SCMI_DRIVER},1)
+$(eval $(call add_define,SQ_USE_SCMI_DRIVER))
+endif
diff --git a/plat/socionext/synquacer/sq_bl31_setup.c b/plat/socionext/synquacer/sq_bl31_setup.c
index fef84ef..c78fe91 100644
--- a/plat/socionext/synquacer/sq_bl31_setup.c
+++ b/plat/socionext/synquacer/sq_bl31_setup.c
@@ -14,7 +14,6 @@
 #include <common/debug.h>
 #include <drivers/arm/pl011.h>
 #include <lib/mmio.h>
-
 #include <sq_common.h>
 
 static console_pl011_t console;
@@ -83,7 +82,7 @@
 #ifdef SPD_opteed
 	struct draminfo di = {0};
 
-	scpi_get_draminfo(&di);
+	sq_scp_get_draminfo(&di);
 
 	/*
 	 * Check if OP-TEE has been loaded in Secure RAM allocated
@@ -154,7 +153,7 @@
 {
 	struct draminfo *di = (struct draminfo *)(unsigned long)DRAMINFO_BASE;
 
-	scpi_get_draminfo(di);
+	sq_scp_get_draminfo(di);
 }
 
 void bl31_plat_arch_setup(void)
diff --git a/plat/socionext/synquacer/sq_psci.c b/plat/socionext/synquacer/sq_psci.c
index 134224d..731b19a 100644
--- a/plat/socionext/synquacer/sq_psci.c
+++ b/plat/socionext/synquacer/sq_psci.c
@@ -19,26 +19,20 @@
 #include <sq_common.h>
 #include "sq_scpi.h"
 
-/* Macros to read the SQ power domain state */
-#define SQ_PWR_LVL0	MPIDR_AFFLVL0
-#define SQ_PWR_LVL1	MPIDR_AFFLVL1
-#define SQ_PWR_LVL2	MPIDR_AFFLVL2
-
-#define SQ_CORE_PWR_STATE(state)	(state)->pwr_domain_state[SQ_PWR_LVL0]
-#define SQ_CLUSTER_PWR_STATE(state)	(state)->pwr_domain_state[SQ_PWR_LVL1]
-#define SQ_SYSTEM_PWR_STATE(state)	((PLAT_MAX_PWR_LVL > SQ_PWR_LVL1) ?\
-				(state)->pwr_domain_state[SQ_PWR_LVL2] : 0)
-
 uintptr_t sq_sec_entrypoint;
 
 int sq_pwr_domain_on(u_register_t mpidr)
 {
+#if SQ_USE_SCMI_DRIVER
+	sq_scmi_on(mpidr);
+#else
 	/*
 	 * SCP takes care of powering up parent power domains so we
 	 * only need to care about level 0
 	 */
 	scpi_set_sq_power_state(mpidr, scpi_power_on, scpi_power_on,
 				 scpi_power_on);
+#endif
 
 	return PSCI_E_SUCCESS;
 }
@@ -70,6 +64,7 @@
 	sq_gic_cpuif_enable();
 }
 
+#if !SQ_USE_SCMI_DRIVER
 static void sq_power_down_common(const psci_power_state_t *target_state)
 {
 	uint32_t cluster_state = scpi_power_on;
@@ -97,10 +92,15 @@
 				 cluster_state,
 				 system_state);
 }
+#endif
 
 void sq_pwr_domain_off(const psci_power_state_t *target_state)
 {
+#if SQ_USE_SCMI_DRIVER
+	sq_scmi_off(target_state);
+#else
 	sq_power_down_common(target_state);
+#endif
 }
 
 void __dead2 sq_system_off(void)
@@ -135,6 +135,9 @@
 
 void __dead2 sq_system_reset(void)
 {
+#if SQ_USE_SCMI_DRIVER
+	sq_scmi_sys_reboot();
+#else
 	uint32_t response;
 
 	/* Send the system reset request to the SCP */
@@ -147,6 +150,7 @@
 	wfi();
 	ERROR("SQ System Reset: operation not handled.\n");
 	panic();
+#endif
 }
 
 void sq_cpu_standby(plat_local_state_t cpu_state)