diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 57840cf903881..13fb92ae3710c 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -3289,8 +3289,7 @@ EXPORT_SYMBOL(uart_remove_one_port);
 
 /**
  * uart_get_rs485_mode() - retrieve rs485 properties for given uart
- * @dev: uart device
- * @rs485conf: output parameter
+ * @port: uart device's target port
  *
  * This function implements the device tree binding described in
  * Documentation/devicetree/bindings/serial/rs485.txt.