diff --git a/include/lib/cpus/aarch64/cortex_a55.h b/include/lib/cpus/aarch64/cortex_a55.h
new file mode 100644
index 0000000..293f2b2
--- /dev/null
+++ b/include/lib/cpus/aarch64/cortex_a55.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __CORTEX_A55_H__
+#define __CORTEX_A55_H__
+
+/* Cortex-A55 MIDR for revision 0 */
+#define CORTEX_A55_MIDR		0x410fd050
+
+/*******************************************************************************
+ * CPU Extended Control register specific definitions.
+ ******************************************************************************/
+#define CORTEX_A55_CPUPWRCTLR_EL1		S3_0_C15_C2_7
+#define CORTEX_A55_CPUECTLR_EL1		S3_0_C15_C1_4
+
+/* Definitions of register field mask in CORTEX_A55_CPUPWRCTLR_EL1 */
+#define CORTEX_A55_CORE_PWRDN_EN_MASK	0x1
+
+#endif /* __CORTEX_A55_H__ */
diff --git a/include/lib/cpus/aarch64/cortex_a75.h b/include/lib/cpus/aarch64/cortex_a75.h
new file mode 100644
index 0000000..1ffe20b
--- /dev/null
+++ b/include/lib/cpus/aarch64/cortex_a75.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __CORTEX_A75_H__
+#define __CORTEX_A75_H__
+
+/* Cortex-A75 MIDR */
+#define CORTEX_A75_MIDR		0x410fd0a0
+
+/*******************************************************************************
+ * CPU Extended Control register specific definitions.
+ ******************************************************************************/
+#define CORTEX_A75_CPUPWRCTLR_EL1	S3_0_C15_C2_7
+#define CORTEX_A75_CPUECTLR_EL1		S3_0_C15_C1_4
+
+/* Definitions of register field mask in CORTEX_A75_CPUPWRCTLR_EL1 */
+#define CORTEX_A75_CORE_PWRDN_EN_MASK	0x1
+
+#endif /* __CORTEX_A75_H__ */