diff --git a/include/drivers/nuvoton/npcm845x/npcm845x_lpuart.h b/include/drivers/nuvoton/npcm845x/npcm845x_lpuart.h
new file mode 100644
index 0000000..8962b90
--- /dev/null
+++ b/include/drivers/nuvoton/npcm845x/npcm845x_lpuart.h
@@ -0,0 +1,230 @@
+/*
+ * Copyright (c) 2015-2023, ARM Limited and Contributors. All rights reserved.
+ *
+ * Copyright (C) 2022-2023 Nuvoton Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __ASM_ARCH_UART_H_
+#define __ASM_ARCH_UART_H_
+
+#ifndef __ASSEMBLY__
+
+struct npcmX50_uart {
+	union {
+		unsigned int rbr;
+		unsigned int thr;
+		unsigned int dll;
+	};
+	union {
+		unsigned int ier;
+		unsigned int dlm;
+	};
+	union {
+		unsigned int iir;
+		unsigned int fcr;
+	};
+	unsigned int lcr;
+	unsigned int mcr;
+	unsigned int lsr;
+	unsigned int msr;
+	unsigned int tor;
+};
+
+typedef enum {
+	/*
+	 * UART0 is a general UART block without modem-I/O-control
+	 * connection to external signals.
+	 */
+	UART0_DEV = 0,
+	/*
+	 * UART1-3 are each a general UART with modem-I/O-control
+	 * connection to external signals.
+	 */
+	UART1_DEV,
+	UART2_DEV,
+	UART3_DEV,
+} UART_DEV_T;
+
+typedef enum {
+	/*
+	 * 0 0 0: Mode 1:
+	 * HSP1 connected to SI2,
+	 * HSP2 connected to UART2,
+	 * UART1 snoops HSP1,
+	 * UART3 snoops SI2
+	 */
+	UART_MUX_MODE1 = 0,
+	/*
+	 * 0 0 1: Mode 2:
+	 * HSP1 connected to UART1,
+	 * HSP2 connected to SI2,
+	 * UART2 snoops HSP2,
+	 * UART3 snoops SI2
+	 */
+	UART_MUX_MODE2,
+	/*
+	 * 0 1 0: Mode 3:
+	 * HSP1 connected to UART1,
+	 * HSP2 connected to UART2,
+	 * UART3 connected to SI2
+	 */
+	UART_MUX_MODE3,
+	/*
+	 * 0 1 1: Mode 4:
+	 * HSP1 connected to SI1,
+	 * HSP2 connected to SI2,
+	 * UART1 snoops SI1,
+	 * UART3 snoops SI2,
+	 * UART2 snoops HSP1 (default)
+	 */
+	UART_MUX_MODE4,
+	/*
+	 * 1 0 0: Mode 5:
+	 * HSP1 connected to SI1,
+	 * HSP2 connected to UART2,
+	 * UART1 snoops HSP1,
+	 * UART3 snoops SI1
+	 */
+	UART_MUX_MODE5,
+	/*
+	 * 1 0 1: Mode 6:
+	 * HSP1 connected to SI1,
+	 * HSP2 connected to SI2,
+	 * UART1 snoops SI1,
+	 * UART3 snoops SI2,
+	 * UART2 snoops HSP2
+	 */
+	UART_MUX_MODE6,
+	/*
+	 * 1 1 0: Mode 7:
+	 * HSP1 connected to SI1,
+	 * HSP2 connected to UART2,
+	 * UART1 snoops HSP1,
+	 * UART3 connected to SI2
+	 */
+	UART_MUX_MODE7,
+	/* Skip UART mode configuration. */
+	UART_MUX_RESERVED,
+	/*
+	 * A SW option to allow config of UART
+	 * without touching the UART mux.
+	 */
+	UART_MUX_SKIP_CONFIG
+} UART_MUX_T;
+
+/*---------------------------------------------------------------------------*/
+/* Common baudrate definitions                                               */
+/*---------------------------------------------------------------------------*/
+typedef enum {
+	UART_BAUDRATE_110 = 110,
+	UART_BAUDRATE_300 = 300,
+	UART_BAUDRATE_600 = 600,
+	UART_BAUDRATE_1200 = 1200,
+	UART_BAUDRATE_2400 = 2400,
+	UART_BAUDRATE_4800 = 4800,
+	UART_BAUDRATE_9600 = 9600,
+	UART_BAUDRATE_14400 = 14400,
+	UART_BAUDRATE_19200 = 19200,
+	UART_BAUDRATE_38400 = 38400,
+	UART_BAUDRATE_57600 = 57600,
+	UART_BAUDRATE_115200 = 115200,
+	UART_BAUDRATE_230400 = 230400,
+	UART_BAUDRATE_380400 = 380400,
+	UART_BAUDRATE_460800 = 460800,
+} UART_BAUDRATE_T;
+
+/*---------------------------------------------------------------------------*/
+/* UART parity types                                                         */
+/*---------------------------------------------------------------------------*/
+typedef enum {
+	UART_PARITY_NONE = 0,
+	UART_PARITY_EVEN,
+	UART_PARITY_ODD,
+} UART_PARITY_T;
+
+/*---------------------------------------------------------------------------*/
+/* Uart stop bits                                                            */
+/*---------------------------------------------------------------------------*/
+typedef enum {
+	UART_STOPBIT_1 = 0x00,
+	UART_STOPBIT_DYNAMIC,
+} UART_STOPBIT_T;
+
+enum FCR_RFITL_TYPE {
+	FCR_RFITL_1B = 0x0,
+	FCR_RFITL_4B = 0x4,
+	FCR_RFITL_8B = 0x8,
+	FCR_RFITL_14B = 0xC,
+};
+
+enum LCR_WLS_TYPE {
+	LCR_WLS_5bit = 0x0,
+	LCR_WLS_6bit = 0x1,
+	LCR_WLS_7bit = 0x2,
+	LCR_WLS_8bit = 0x3,
+};
+
+#define IER_DBGACK (1 << 4)
+#define IER_MSIE (1 << 3)
+#define IER_RLSE (1 << 2)
+#define IER_THREIE (1 << 1)
+#define IER_RDAIE (1 << 0)
+
+#define IIR_FMES (1 << 7)
+#define IIR_RFTLS (1 << 5)
+#define IIR_DMS (1 << 4)
+#define IIR_IID (1 << 1)
+#define IIR_NIP (1 << 0)
+
+#define FCR_RFITL_1B (0 << 4)
+#define FCR_RFITL_4B (4 << 4)
+#define FCR_RFITL_8B (8 << 4)
+#define FCR_RFITL_14B (12 << 4)
+#define FCR_DMS (1 << 3)
+#define FCR_TFR (1 << 2)
+#define FCR_RFR (1 << 1)
+#define FCR_FME (1 << 0)
+
+#define LCR_DLAB (1 << 7)
+#define LCR_BCB (1 << 6)
+#define LCR_SPE (1 << 5)
+#define LCR_EPS (1 << 4)
+#define LCR_PBE (1 << 3)
+#define LCR_NSB (1 << 2)
+#define LCR_WLS_8b (3 << 0)
+#define LCR_WLS_7b (2 << 0)
+#define LCR_WLS_6b (1 << 0)
+#define LCR_WLS_5b (0 << 0)
+
+#define MCR_LBME (1 << 4)
+#define MCR_OUT2 (1 << 3)
+#define MCR_RTS (1 << 1)
+#define MCR_DTR (1 << 0)
+
+#define LSR_ERR_RX (1 << 7)
+#define LSR_TE (1 << 6)
+#define LSR_THRE (1 << 5)
+#define LSR_BII (1 << 4)
+#define LSR_FEI (1 << 3)
+#define LSR_PEI (1 << 2)
+#define LSR_OEI (1 << 1)
+#define LSR_RFDR (1 << 0)
+
+#define MSR_DCD (1 << 7)
+#define MSR_RI (1 << 6)
+#define MSR_DSR (1 << 5)
+#define MSR_CTS (1 << 4)
+#define MSR_DDCD (1 << 3)
+#define MSR_DRI (1 << 2)
+#define MSR_DDSR (1 << 1)
+#define MSR_DCTS (1 << 0)
+
+#endif /* __ASSEMBLY__ */
+
+uintptr_t npcm845x_get_base_uart(UART_DEV_T dev);
+void CLK_ResetUART(void);
+int UART_Init(UART_DEV_T devNum, UART_BAUDRATE_T baudRate);
+
+#endif /* __ASM_ARCH_UART_H_ */