diff --git a/arch/arm64/boot/dts/rockchip/overlays/odroidm2/Makefile b/arch/arm64/boot/dts/rockchip/overlays/odroidm2/Makefile
index 36adda56369c..589711743e38 100644
--- a/arch/arm64/boot/dts/rockchip/overlays/odroidm2/Makefile
+++ b/arch/arm64/boot/dts/rockchip/overlays/odroidm2/Makefile
@@ -20,6 +20,7 @@ dtbo-y += \
 	spi0.dtbo \
 	ttyfiq0_115200.dtbo \
 	uart0.dtbo \
+	uart1-with-ctsrts.dtbo \
 	uart1.dtbo \
 	uart2.dtbo \
 	uart3.dtbo \
diff --git a/arch/arm64/boot/dts/rockchip/overlays/odroidm2/uart1-with-ctsrts.dts b/arch/arm64/boot/dts/rockchip/overlays/odroidm2/uart1-with-ctsrts.dts
new file mode 100644
index 000000000000..9169db108d57
--- /dev/null
+++ b/arch/arm64/boot/dts/rockchip/overlays/odroidm2/uart1-with-ctsrts.dts
@@ -0,0 +1,13 @@
+/dts-v1/;
+/plugin/;
+
+/ {
+	fragment@0 {
+		target = <&uart9>;
+
+		__overlay__ {
+			status = "okay";
+			pinctrl-names = "not_use_it", "default";
+		};
+	};
+};
diff --git a/arch/arm64/boot/dts/rockchip/rk3588s-odroid-m2.dtsi b/arch/arm64/boot/dts/rockchip/rk3588s-odroid-m2.dtsi
index 58293626a017..2eba721dffb4 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588s-odroid-m2.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3588s-odroid-m2.dtsi
@@ -1049,6 +1049,7 @@
 
 &uart9 {
 	pinctrl-0 = <&uart9m2_xfer>;
+	pinctrl-1 = <&uart9m2_xfer &uart9m2_ctsn &uart9m2_rtsn>;
 	dma-names = "tx", "rx";
 	status = "disabled";
 };