diff --git a/target/linux/realtek/dts/rtl931x.dtsi b/target/linux/realtek/dts/rtl931x.dtsi
index ff3d5c8f29..2335d33932 100644
--- a/target/linux/realtek/dts/rtl931x.dtsi
+++ b/target/linux/realtek/dts/rtl931x.dtsi
@@ -210,25 +210,29 @@
 
 			status = "disabled";
 		};
+
+		mdio_aux: mdio-aux {
+			compatible = "realtek,rtl9310-aux-mdio";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			pinctrl-0 = <&pinmux_gpio_mdio_en>;
+			pinctrl-names = "default";
+
+			status = "disabled";
+		};
 	};
 
-	pinmux: pinmux@1b001358 {
+	pinmux@1b0007d4 {
 		compatible = "pinctrl-single";
-		reg = <0x1b001358 0x4>;
+		reg = <0x1b0007d4 0x4>;
 
 		pinctrl-single,bit-per-mux;
 		pinctrl-single,register-width = <32>;
 		pinctrl-single,function-mask = <0x1>;
 		#pinctrl-cells = <2>;
 
-		/* Enable GPIO6 and GPIO7, possibly unknown others */
-		pinmux_disable_jtag: disable_jtag {
-			pinctrl-single,bits = <0x0 0x0 0x8000>;
-		};
-
-		/* Controls GPIO0 */
-		pinmux_disable_sys_led: disable_sys_led {
-			pinctrl-single,bits = <0x0 0x0 0x100>;
+		pinmux_gpio_mdio_en: gpio-mdio-en {
+			pinctrl-single,bits = <0x0 0x100 0x100>;
 		};
 	};