diff --git a/include/common/bl_common.h b/include/common/bl_common.h
index 8cb4990..3a06cfb 100644
--- a/include/common/bl_common.h
+++ b/include/common/bl_common.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013-2021, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2022, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -81,6 +81,10 @@
 #define __RODATA_END__			Load$$__RODATA_EPILOGUE__$$Base
 #define __RT_SVC_DESCS_START__		Load$$__RT_SVC_DESCS__$$Base
 #define __RT_SVC_DESCS_END__		Load$$__RT_SVC_DESCS__$$Limit
+#if SPMC_AT_EL3
+#define __EL3_LP_DESCS_START__		Load$$__EL3_LP_DESCS__$$Base
+#define __EL3_LP_DESCS_END__		Load$$__EL3_LP_DESCS__$$Limit
+#endif
 #define __RW_START__			Load$$LR$$LR_RW_DATA$$Base
 #define __RW_END__			Load$$LR$$LR_END$$Base
 #define __SPM_SHIM_EXCEPTIONS_START__	Load$$__SPM_SHIM_EXCEPTIONS__$$Base
diff --git a/include/common/bl_common.ld.h b/include/common/bl_common.ld.h
index 9888a3c..080e331 100644
--- a/include/common/bl_common.ld.h
+++ b/include/common/bl_common.ld.h
@@ -39,6 +39,16 @@
 	KEEP(*(rt_svc_descs))				\
 	__RT_SVC_DESCS_END__ = .;
 
+#if SPMC_AT_EL3
+#define EL3_LP_DESCS					\
+	. = ALIGN(STRUCT_ALIGN);			\
+	__EL3_LP_DESCS_START__ = .;			\
+	KEEP(*(el3_lp_descs))				\
+	__EL3_LP_DESCS_END__ = .;
+#else
+#define EL3_LP_DESCS
+#endif
+
 #define PMF_SVC_DESCS					\
 	. = ALIGN(STRUCT_ALIGN);			\
 	__PMF_SVC_DESCS_START__ = .;			\
@@ -89,7 +99,8 @@
 	PARSER_LIB_DESCS				\
 	CPU_OPS						\
 	GOT						\
-	BASE_XLAT_TABLE_RO
+	BASE_XLAT_TABLE_RO				\
+	EL3_LP_DESCS
 
 /*
  * .data must be placed at a lower address than the stacks if the stack
diff --git a/include/services/el3_spmc_logical_sp.h b/include/services/el3_spmc_logical_sp.h
new file mode 100644
index 0000000..7ec9958
--- /dev/null
+++ b/include/services/el3_spmc_logical_sp.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#ifndef EL3_SP_H
+#define EL3_SP_H
+
+#include <common/bl_common.h>
+#include <lib/cassert.h>
+
+/*******************************************************************************
+ * Structure definition, typedefs & constants for the Logical SPs.
+ ******************************************************************************/
+
+typedef uint64_t (*direct_msg_handler)(uint32_t smc_fid, bool secure_origin,
+				       uint64_t x1, uint64_t x2, uint64_t x3,
+				       uint64_t x4, void *cookie, void *handle,
+				       uint64_t flags);
+
+/* Prototype for logical partition initializing function. */
+typedef int32_t (*ffa_partition_init_t)(void);
+
+/* Logical Partition Descriptor. */
+struct el3_lp_desc {
+	ffa_partition_init_t init;
+	uint16_t sp_id;
+	uint32_t properties;
+	uint32_t uuid[4];  /* Little Endian. */
+	direct_msg_handler direct_req;
+	const char *debug_name;
+};
+
+/* Convenience macro to declare a logical partition descriptor. */
+#define DECLARE_LOGICAL_PARTITION(_name, _init, _sp_id, _uuid, _properties, \
+				  _direct_req)				    \
+	static const struct el3_lp_desc __partition_desc_ ## _name	    \
+		__section("el3_lp_descs") __used = {			    \
+			.debug_name = #_name,				    \
+			.init = (_init),				    \
+			.sp_id = (_sp_id),				    \
+			.uuid = _uuid,					    \
+			.properties = (_properties),			    \
+			.direct_req = (_direct_req),			    \
+		}
+
+
+/*******************************************************************************
+ * Function & variable prototypes.
+ ******************************************************************************/
+int el3_sp_desc_validate(void);
+uintptr_t handle_el3_sp(uint32_t smc_fid, void *cookie, void *handle,
+						unsigned int flags);
+IMPORT_SYM(uintptr_t, __EL3_LP_DESCS_START__,	EL3_LP_DESCS_START);
+IMPORT_SYM(uintptr_t, __EL3_LP_DESCS_END__,	EL3_LP_DESCS_END);
+
+#define EL3_LP_DESCS_COUNT ((EL3_LP_DESCS_END - EL3_LP_DESCS_START) \
+			  / sizeof(struct el3_lp_desc))
+
+#endif /* EL3_SP_H */
diff --git a/include/services/ffa_svc.h b/include/services/ffa_svc.h
index d3fb012..2b4a377 100644
--- a/include/services/ffa_svc.h
+++ b/include/services/ffa_svc.h
@@ -164,6 +164,13 @@
 	FFA_FID(SMC_64, FFA_FNUM_NOTIFICATION_INFO_GET)
 
 /*
+ * FF-A partition properties values.
+ */
+#define FFA_PARTITION_DIRECT_REQ_RECV	U(1 << 0)
+#define FFA_PARTITION_DIRECT_REQ_SEND	U(1 << 1)
+#define FFA_PARTITION_INDIRECT_MSG	U(1 << 2)
+
+/*
  * Reserve a special value for traffic targeted to the Hypervisor or SPM.
  */
 #define FFA_TARGET_INFO_MBZ		U(0x0)