diff --git a/include/plat/arm/css/common/css_def.h b/include/plat/arm/css/common/css_def.h
index 2adf11d..7b61484 100644
--- a/include/plat/arm/css/common/css_def.h
+++ b/include/plat/arm/css/common/css_def.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2020, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -29,6 +29,10 @@
 #define SID_REG_BASE			0x2a4a0000
 #define SID_SYSTEM_ID_OFFSET		0x40
 #define SID_SYSTEM_CFG_OFFSET		0x70
+#define SID_NODE_ID_OFFSET		0x60
+#define SID_CHIP_ID_MASK		0xFF
+#define SID_MULTI_CHIP_MODE_MASK	0x100
+#define SID_MULTI_CHIP_MODE_SHIFT	8
 
 /* The slave_bootsecure controls access to GPU, DMC and CS. */
 #define CSS_NIC400_SLAVE_BOOTSECURE	8