diff --git a/include/plat/nuvoton/common/plat_npcm845x.h b/include/plat/nuvoton/common/plat_npcm845x.h
new file mode 100644
index 0000000..d90952a
--- /dev/null
+++ b/include/plat/nuvoton/common/plat_npcm845x.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2015-2023, ARM Limited and Contributors. All rights reserved.
+ *
+ * Copyright (c) 2017-2023 Nuvoton Technology Corp.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef PLAT_NPCM845X_H
+#define PLAT_NPCM845X_H
+
+#include <drivers/arm/gicv2.h>
+#include <lib/psci/psci.h>
+
+unsigned int plat_calc_core_pos(uint64_t mpidr);
+void npcm845x_mailbox_init(uintptr_t base_addr);
+void plat_gic_driver_init(void);
+void plat_gic_init(void);
+void plat_gic_cpuif_enable(void);
+void plat_gic_cpuif_disable(void);
+void plat_gic_pcpu_init(void);
+
+void __dead2 npcm845x_system_off(void);
+void __dead2 npcm845x_system_reset(void);
+void npcm845x_pwr_domain_on_finish(const psci_power_state_t *target_state);
+bool npcm845x_is_wakeup_src_irqsteer(void);
+void __dead2 npcm845x_pwr_down_wfi(const psci_power_state_t *target_state);
+void npcm845x_cpu_standby(plat_local_state_t cpu_state);
+int npcm845x_validate_ns_entrypoint(uintptr_t entrypoint);
+int npcm845x_pwr_domain_on(u_register_t mpidr);
+int npcm845x_validate_power_state(unsigned int power_state,
+				  psci_power_state_t *req_state);
+
+#if !ARM_BL31_IN_DRAM
+void npcm845x_get_sys_suspend_power_state(psci_power_state_t *req_state);
+#endif
+
+void __dead2 npcm845x_pwr_domain_pwr_down_wfi(
+	const psci_power_state_t *target_state);
+void npcm845x_pwr_domain_suspend_finish(const psci_power_state_t *target_state);
+void npcm845x_pwr_domain_suspend(const psci_power_state_t *target_state);
+void npcm845x_pwr_domain_off(const psci_power_state_t *target_state);
+void __init npcm845x_bl31_plat_arch_setup(void);
+
+#endif /* PLAT_NPCM845X_H */