diff --git a/arch/arm/dts/en7523-u-boot.dtsi b/arch/arm/dts/en7523-u-boot.dtsi
index f031f81515a..9eadaccc500 100644
--- a/arch/arm/dts/en7523-u-boot.dtsi
+++ b/arch/arm/dts/en7523-u-boot.dtsi
@@ -42,6 +42,11 @@
 	switch: switch@1fb58000 {
 		compatible = "airoha,en7523-switch";
 		reg = <0x1fb58000 0x8000>;
+
+		mdio: mdio {
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
 	};
 
 	snfi: spi@1fa10000 {