diff --git a/docs/plat/xilinx-zynqmp.rst b/docs/plat/xilinx-zynqmp.rst
index af1cb22..40fbcf7 100644
--- a/docs/plat/xilinx-zynqmp.rst
+++ b/docs/plat/xilinx-zynqmp.rst
@@ -71,3 +71,40 @@
 
 The 4 leaf power domains represent the individual A53 cores, while resources
 common to the cluster are grouped in the power domain on the top.
+
+CUSTOM SIP service support
+--------------------------
+
+- Dedicated SMC FID ZYNQMP_SIP_SVC_CUSTOM(0x82002000)(32-bit)/
+  (0xC2002000)(64-bit) to be used by a custom package for
+  providing CUSTOM SIP service.
+
+- by default platform provides bare minimum definition for
+  custom_smc_handler in this service.
+
+- to use this service, custom package should implement their
+  smc handler with the name custom_smc_handler. once custom package is
+  included in TF-A build, their definition of custom_smc_handler is
+  enabled.
+
+Custom package makefile fragment inclusion in TF-A build
+--------------------------------------------------------
+
+- custom package is not directly part of TF-A source.
+
+- <CUSTOM_PKG_PATH> is the location at which user clones a
+  custom package locally.
+
+- custom package needs to implement makefile fragment named
+  custom_pkg.mk so as to get included in TF-A build.
+
+- custom_pkg.mk specify all the rules to include custom package
+  specific header files, dependent libs, source files that are
+  supposed to be included in TF-A build.
+
+- when <CUSTOM_PKG_PATH> is specified in TF-A build command,
+  custom_pkg.mk is included from <CUSTOM_PKG_PATH> in TF-A build.
+
+- TF-A build command:
+  make CROSS_COMPILE=aarch64-none-elf- PLAT=zynqmp RESET_TO_BL31=1
+  bl31 CUSTOM_PKG_PATH=<...>
diff --git a/plat/xilinx/zynqmp/custom_sip_svc.c b/plat/xilinx/zynqmp/custom_sip_svc.c
new file mode 100644
index 0000000..459aa39
--- /dev/null
+++ b/plat/xilinx/zynqmp/custom_sip_svc.c
@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2022-2023, Advanced Micro Devices Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <smccc_helpers.h>
+
+uint64_t custom_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2,
+			    uint64_t x3, uint64_t x4, void *cookie,
+			    void *handle, uint64_t flags)
+{
+	WARN("Unimplemented SiP Service Call: 0x%x\n", smc_fid);
+	SMC_RET1(handle, SMC_UNK);
+}
diff --git a/plat/xilinx/zynqmp/include/custom_svc.h b/plat/xilinx/zynqmp/include/custom_svc.h
new file mode 100644
index 0000000..389a7bc
--- /dev/null
+++ b/plat/xilinx/zynqmp/include/custom_svc.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2022-2023, Advanced Micro Devices Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#ifndef CUSTOM_SVC_H
+#define CUSTOM_SVC_H
+
+#define ZYNQMP_SIP_SVC_CUSTOM   U(0x82002000)
+#define ZYNQMP_SIP_SVC64_CUSTOM U(0xC2002000)
+
+uint64_t custom_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2,
+			    uint64_t x3, uint64_t x4, void *cookie,
+			    void *handle, uint64_t flags);
+
+#endif /* CUSTOM_SVC_H */
diff --git a/plat/xilinx/zynqmp/platform.mk b/plat/xilinx/zynqmp/platform.mk
index b751de8..38e7408 100644
--- a/plat/xilinx/zynqmp/platform.mk
+++ b/plat/xilinx/zynqmp/platform.mk
@@ -139,6 +139,12 @@
 BL31_CPPFLAGS		+=	-fno-jump-tables
 TF_CFLAGS_aarch64	+=	-mbranch-protection=none
 
+ifdef CUSTOM_PKG_PATH
+include $(CUSTOM_PKG_PATH)/custom_pkg.mk
+else
+BL31_SOURCES		+=	plat/xilinx/zynqmp/custom_sip_svc.c
+endif
+
 ifneq (${RESET_TO_BL31},1)
   $(error "Using BL31 as the reset vector is only one option supported on ZynqMP. Please set RESET_TO_BL31 to 1.")
 endif
diff --git a/plat/xilinx/zynqmp/sip_svc_setup.c b/plat/xilinx/zynqmp/sip_svc_setup.c
index 4ce9b8a..997cb1e 100644
--- a/plat/xilinx/zynqmp/sip_svc_setup.c
+++ b/plat/xilinx/zynqmp/sip_svc_setup.c
@@ -9,6 +9,7 @@
 #include <common/runtime_svc.h>
 #include <tools_share/uuid.h>
 
+#include <custom_svc.h>
 #include "ipi_mailbox_svc.h"
 #include "pm_svc_main.h"
 
@@ -89,6 +90,11 @@
 	case ZYNQMP_SIP_SVC_VERSION:
 		SMC_RET2(handle, SIP_SVC_VERSION_MAJOR, SIP_SVC_VERSION_MINOR);
 
+	case ZYNQMP_SIP_SVC_CUSTOM:
+	case ZYNQMP_SIP_SVC64_CUSTOM:
+		return custom_smc_handler(smc_fid, x1, x2, x3, x4, cookie,
+					  handle, flags);
+
 	default:
 		WARN("Unimplemented SiP Service Call: 0x%x\n", smc_fid);
 		SMC_RET1(handle, SMC_UNK);