diff --git a/arch/arm/boot/dts/mt7629-rfb.dts b/arch/arm/boot/dts/mt7629-rfb.dts
index 3621b7d2b22a..9980c10c6e29 100644
--- a/arch/arm/boot/dts/mt7629-rfb.dts
+++ b/arch/arm/boot/dts/mt7629-rfb.dts
@@ -66,9 +66,21 @@
 	pinctrl-1 = <&ephy_leds_pins>;
 	status = "okay";
 
+	gmac0: mac@0 {
+		compatible = "mediatek,eth-mac";
+		reg = <0>;
+		phy-mode = "2500base-x";
+		fixed-link {
+			speed = <2500>;
+			full-duplex;
+			pause;
+		};
+	};
+
 	gmac1: mac@1 {
 		compatible = "mediatek,eth-mac";
 		reg = <1>;
+		phy-mode = "gmii";
 		phy-handle = <&phy0>;
 	};
 
@@ -78,7 +90,6 @@
 
 		phy0: ethernet-phy@0 {
 			reg = <0>;
-			phy-mode = "gmii";
 		};
 	};
 };
diff --git a/arch/arm/boot/dts/mt7629.dtsi b/arch/arm/boot/dts/mt7629.dtsi
index 9608bc2ccb3f..867b88103b9d 100644
--- a/arch/arm/boot/dts/mt7629.dtsi
+++ b/arch/arm/boot/dts/mt7629.dtsi
@@ -468,14 +468,12 @@
 			compatible = "mediatek,mt7629-sgmiisys", "syscon";
 			reg = <0x1b128000 0x3000>;
 			#clock-cells = <1>;
-			mediatek,physpeed = "2500";
 		};
 
 		sgmiisys1: syscon@1b130000 {
 			compatible = "mediatek,mt7629-sgmiisys", "syscon";
 			reg = <0x1b130000 0x3000>;
 			#clock-cells = <1>;
-			mediatek,physpeed = "2500";
 		};
 	};
 };