diff --git a/arch/arm/dts/armada-xp-theadorable.dts b/arch/arm/dts/armada-xp-theadorable.dts
index 5b18d62c3c..6a1df870ab 100644
--- a/arch/arm/dts/armada-xp-theadorable.dts
+++ b/arch/arm/dts/armada-xp-theadorable.dts
@@ -107,6 +107,8 @@
 			};
 
 			mdio {
+				#address-cells = <1>;
+				#size-cells = <0>;
 				phy0: ethernet-phy@0 {
 					reg = <0>;
 				};