diff --git a/arch/arm64/boot/dts/amlogic/meson64_odroidc4.dts b/arch/arm64/boot/dts/amlogic/meson64_odroidc4.dts
index 927ec30ddd52..6732d95bc673 100644
--- a/arch/arm64/boot/dts/amlogic/meson64_odroidc4.dts
+++ b/arch/arm64/boot/dts/amlogic/meson64_odroidc4.dts
@@ -932,6 +932,13 @@
 			drive-strength = <2>;
 		};
 	};
+	ao_b_uart_pins2: ao_b_uart2 {
+		mux { /* GPIOAO_8, GPIOAO_9 */
+			groups = "uart_ao_tx_b_8",
+				"uart_ao_rx_b_9";
+			function = "uart_ao_b";
+		};
+	};
 }; /* end of pinctrl_aobus */
 
 &spicc0 {
diff --git a/arch/arm64/boot/dts/amlogic/overlays/odroidc4/Makefile b/arch/arm64/boot/dts/amlogic/overlays/odroidc4/Makefile
index 705256f2e68d..0097731679aa 100644
--- a/arch/arm64/boot/dts/amlogic/overlays/odroidc4/Makefile
+++ b/arch/arm64/boot/dts/amlogic/overlays/odroidc4/Makefile
@@ -6,6 +6,7 @@ dtbo-$(CONFIG_ARCH_MESON64_ODROIDC4) += spi0.dtbo	\
 					uart0.dtbo		\
 					uart1.dtbo		\
 					uart2.dtbo		\
+					uart3.dtbo		\
 					hktft32.dtbo		\
 					hktft35.dtbo		\
 					ads7846.dtbo		\
diff --git a/arch/arm64/boot/dts/amlogic/overlays/odroidc4/uart3.dts b/arch/arm64/boot/dts/amlogic/overlays/odroidc4/uart3.dts
new file mode 100644
index 000000000000..c272ff7201ee
--- /dev/null
+++ b/arch/arm64/boot/dts/amlogic/overlays/odroidc4/uart3.dts
@@ -0,0 +1,15 @@
+/dts-v1/;
+/plugin/;
+
+/ {
+	fragment@0 {
+		target = <&uart_AO_B>;
+
+		__overlay__ {
+			status = "okay";
+
+			pinctrl-names = "default";
+			pinctrl-0 = <&ao_b_uart_pins2>;
+		};
+	};
+};