diff --git a/arch/arm/dts/kirkwood-nsa310s.dts b/arch/arm/dts/kirkwood-nsa310s.dts
index e1c9c90..09ee76c 100644
--- a/arch/arm/dts/kirkwood-nsa310s.dts
+++ b/arch/arm/dts/kirkwood-nsa310s.dts
@@ -306,6 +306,7 @@
 	status = "okay";
 	ethernet0-port@0 {
 		phy-handle = <&ethphy0>;
+		phy-mode = "rgmii";
 	};
 };