diff --git a/plat/arm/board/morello/morello_bl31_setup.c b/plat/arm/board/morello/morello_bl31_setup.c
index cef42f4..e13a38b 100644
--- a/plat/arm/board/morello/morello_bl31_setup.c
+++ b/plat/arm/board/morello/morello_bl31_setup.c
@@ -12,6 +12,7 @@
 #include <services/arm_arch_svc.h>
 
 #include "morello_def.h"
+#include "morello_private.h"
 #include <platform_def.h>
 
 #ifdef TARGET_PLATFORM_SOC
@@ -33,6 +34,8 @@
 
 const plat_psci_ops_t *plat_arm_psci_override_pm_ops(plat_psci_ops_t *ops)
 {
+	ops->pwr_domain_off = morello_pwr_domain_off;
+	ops->pwr_domain_suspend = morello_pwr_domain_suspend;
 	return css_scmi_override_pm_ops(ops);
 }
 
diff --git a/plat/arm/board/morello/morello_pm.c b/plat/arm/board/morello/morello_pm.c
new file mode 100644
index 0000000..dda006e
--- /dev/null
+++ b/plat/arm/board/morello/morello_pm.c
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2023, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <lib/psci/psci.h>
+#include <plat/arm/common/plat_arm.h>
+#include <plat/arm/css/common/css_pm.h>
+
+#include "morello_private.h"
+
+/*******************************************************************************
+ * Morello specific functions called when turning off or suspending a power
+ * domain. Both additionally disable the GIC redistributor interface as cores
+ * are disabled to let cluster-PPU state transition to completion when a
+ * cluster is powered down.
+ ******************************************************************************/
+void morello_pwr_domain_off(const psci_power_state_t *target_state)
+{
+	css_pwr_domain_off(target_state);
+	plat_arm_gic_redistif_off();
+}
+
+void morello_pwr_domain_suspend(const psci_power_state_t *target_state)
+{
+	css_pwr_domain_suspend(target_state);
+	plat_arm_gic_redistif_off();
+}
diff --git a/plat/arm/board/morello/morello_private.h b/plat/arm/board/morello/morello_private.h
new file mode 100644
index 0000000..ea2fce9
--- /dev/null
+++ b/plat/arm/board/morello/morello_private.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2023, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef MORELLO_PRIVATE_H
+#define MORELLO_PRIVATE_H
+
+#include <lib/psci/psci.h>
+
+void morello_pwr_domain_off(const psci_power_state_t *target_state);
+void morello_pwr_domain_suspend(const psci_power_state_t *target_state);
+
+#endif /* MORELLO_PRIVATE_H */
diff --git a/plat/arm/board/morello/platform.mk b/plat/arm/board/morello/platform.mk
index 0f0cabb..0ae7693 100644
--- a/plat/arm/board/morello/platform.mk
+++ b/plat/arm/board/morello/platform.mk
@@ -49,6 +49,7 @@
 				${INTERCONNECT_SOURCES}			\
 				${MORELLO_GIC_SOURCES}			\
 				${MORELLO_BASE}/morello_bl31_setup.c	\
+				${MORELLO_BASE}/morello_pm.c		\
 				${MORELLO_BASE}/morello_topology.c	\
 				${MORELLO_BASE}/morello_security.c	\
 				drivers/arm/css/sds/sds.c
diff --git a/plat/arm/board/n1sdp/n1sdp_bl31_setup.c b/plat/arm/board/n1sdp/n1sdp_bl31_setup.c
index bd05660..db7215f 100644
--- a/plat/arm/board/n1sdp/n1sdp_bl31_setup.c
+++ b/plat/arm/board/n1sdp/n1sdp_bl31_setup.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2022, Arm Limited. All rights reserved.
+ * Copyright (c) 2018-2023, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -14,6 +14,7 @@
 #include <plat/arm/common/plat_arm.h>
 
 #include "n1sdp_def.h"
+#include "n1sdp_private.h"
 #include <platform_def.h>
 
 /*
@@ -69,6 +70,8 @@
 
 const plat_psci_ops_t *plat_arm_psci_override_pm_ops(plat_psci_ops_t *ops)
 {
+	ops->pwr_domain_off = n1sdp_pwr_domain_off;
+	ops->pwr_domain_suspend = n1sdp_pwr_domain_suspend;
 	return css_scmi_override_pm_ops(ops);
 }
 
diff --git a/plat/arm/board/n1sdp/n1sdp_pm.c b/plat/arm/board/n1sdp/n1sdp_pm.c
new file mode 100644
index 0000000..e43832a
--- /dev/null
+++ b/plat/arm/board/n1sdp/n1sdp_pm.c
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2023, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <lib/psci/psci.h>
+#include <plat/arm/common/plat_arm.h>
+#include <plat/arm/css/common/css_pm.h>
+
+#include "n1sdp_private.h"
+
+/*******************************************************************************
+ * N1SDP specific functions called when turning off or suspending a power
+ * domain. Both additionally disable the GIC redistributor interface as cores
+ * are disabled to let cluster-PPU state transition to completion when a
+ * cluster is powered down.
+ ******************************************************************************/
+void n1sdp_pwr_domain_off(const psci_power_state_t *target_state)
+{
+	css_pwr_domain_off(target_state);
+	plat_arm_gic_redistif_off();
+}
+
+void n1sdp_pwr_domain_suspend(const psci_power_state_t *target_state)
+{
+	css_pwr_domain_suspend(target_state);
+	plat_arm_gic_redistif_off();
+}
diff --git a/plat/arm/board/n1sdp/n1sdp_private.h b/plat/arm/board/n1sdp/n1sdp_private.h
new file mode 100644
index 0000000..7a5c51d
--- /dev/null
+++ b/plat/arm/board/n1sdp/n1sdp_private.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2023, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef N1SDP_PRIVATE_H
+#define N1SDP_PRIVATE_H
+
+#include <lib/psci/psci.h>
+
+void n1sdp_pwr_domain_off(const psci_power_state_t *target_state);
+void n1sdp_pwr_domain_suspend(const psci_power_state_t *target_state);
+
+#endif /* N1SDP_PRIVATE_H */
diff --git a/plat/arm/board/n1sdp/platform.mk b/plat/arm/board/n1sdp/platform.mk
index 9c0cc02..bd62614 100644
--- a/plat/arm/board/n1sdp/platform.mk
+++ b/plat/arm/board/n1sdp/platform.mk
@@ -47,6 +47,7 @@
 				${INTERCONNECT_SOURCES}			\
 				${N1SDP_GIC_SOURCES}			\
 				${N1SDP_BASE}/n1sdp_bl31_setup.c	\
+				${N1SDP_BASE}/n1sdp_pm.c		\
 				${N1SDP_BASE}/n1sdp_topology.c	        \
 				${N1SDP_BASE}/n1sdp_security.c		\
 				drivers/arm/css/sds/sds.c