diff --git a/arch/arm/boot/dts/sun9i-a80-optimus.dts b/arch/arm/boot/dts/sun9i-a80-optimus.dts
index 87b1355e3cd7..506948f582ee 100644
--- a/arch/arm/boot/dts/sun9i-a80-optimus.dts
+++ b/arch/arm/boot/dts/sun9i-a80-optimus.dts
@@ -71,6 +71,11 @@ led_pins_optimus: led-pins@0 {
 				allwinner,drive = <0>;
 				allwinner,pull = <0>;
 			};
+
+			uart4_pins_a: uart4@0 {
+				/* Enable internal pull-up */
+				allwinner,pull = <1>;
+			};
 		};
 
 		uart0: serial@07000000 {
@@ -79,6 +84,12 @@ uart0: serial@07000000 {
 			status = "okay";
 		};
 
+		uart4: serial@07001000 {
+			pinctrl-names = "default";
+			pinctrl-0 = <&uart4_pins_a>;
+			status = "okay";
+		};
+
 		i2c3: i2c@07003400 {
 			pinctrl-names = "default";
 			pinctrl-0 = <&i2c3_pins_a>;