lib: utils: serial: Add Cadence UART driver

Add Cadence UART driver

Signed-off-by: Jun Liang Tan <junliang.tan@linux.starfivetech.com>
Signed-off-by: Wei Liang Lim <weiliang.lim@linux.starfivetech.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>

include/sbi_utils/serial/cadence-uart.h

@@ -0,0 +1,16 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2022 StarFive Technology Co., Ltd.
+ *
+ * Author: Jun Liang Tan <junliang.tan@linux.starfivetech.com>
+ */
+
+#ifndef __SERIAL_CADENCE_UART_H__
+#define __SERIAL_CADENCE_UART_H__
+
+#include <sbi/sbi_types.h>
+
+int cadence_uart_init(unsigned long base, u32 in_freq, u32 baudrate);
+
+#endif