serial: uart_ns16550: add uart_ns16550_get_port() function

For user to get the register address of the device by this function

Signed-off-by: Lin Yu-Cheng <lin_yu_cheng@realtek.com>

Author: JasonLin-RealTek

drivers/serial/uart_ns16550.c

@@ -384,6 +384,13 @@ struct uart_ns16550_dev_data {
 #endif
 };
 
+uint32_t uart_ns16550_get_port(const struct device *dev)
+{
+	const struct uart_ns16550_dev_config *config = dev->config;
+
+	return config->port;
+}
+
 static void ns16550_outbyte(const struct uart_ns16550_dev_config *cfg,
 			    uintptr_t port, uint8_t val)
 {

include/zephyr/drivers/serial/uart_ns16550.h

@@ -20,4 +20,11 @@
  */
 #define CMD_SET_DLF	0x01
 
+/**
+ * @brief Get the device address from uart_ns16550.
+ *
+ * @param dev UART device instance
+ */
+uint32_t uart_ns16550_get_port(const struct device *dev);
+
 #endif /* ZEPHYR_INCLUDE_DRIVERS_SERIAL_UART_NS16550_H_ */