diff --git a/include/plat/arm/css/common/css_pm.h b/include/plat/arm/css/common/css_pm.h
index e5357f5..45f2c08 100644
--- a/include/plat/arm/css/common/css_pm.h
+++ b/include/plat/arm/css/common/css_pm.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2020, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2022, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -12,6 +12,9 @@
 
 #include <lib/psci/psci.h>
 
+/* SGI used to trigger per-core power down request */
+#define CSS_CPU_PWR_DOWN_REQ_INTR	ARM_IRQ_SEC_SGI_7
+
 /* Macros to read the CSS power domain state */
 #define CSS_CORE_PWR_STATE(state)	(state)->pwr_domain_state[ARM_PWR_LVL0]
 #define CSS_CLUSTER_PWR_STATE(state)	(state)->pwr_domain_state[ARM_PWR_LVL1]
@@ -37,6 +40,7 @@
 void css_cpu_standby(plat_local_state_t cpu_state);
 void css_get_sys_suspend_power_state(psci_power_state_t *req_state);
 int css_node_hw_state(u_register_t mpidr, unsigned int power_level);
+void css_setup_cpu_pwr_down_intr(void);
 
 /*
  * This mapping array has to be exported by the platform. Each element at