--- a/arch/arm/boot/dts/gemini-nas4220b.dts
+++ b/arch/arm/boot/dts/gemini-nas4220b.dts
@@ -137,6 +137,47 @@
 						groups = "gpio1dgrp";
 					};
 				};
+				pinctrl-gmii {
+					mux {
+						function = "gmii";
+						groups = "gmii_gmac0_grp";
+					};
+					conf0 {
+						pins = "V8 GMAC0 RXDV", "T10 GMAC1 RXDV";
+						skew-delay = <0>;
+					};
+					conf1 {
+						pins = "Y7 GMAC0 RXC", "Y11 GMAC1 RXC";
+						skew-delay = <15>;
+					};
+					conf2 {
+						pins = "T8 GMAC0 TXEN", "W11 GMAC1 TXEN";
+						skew-delay = <7>;
+					};
+					conf3 {
+						pins = "U8 GMAC0 TXC";
+						skew-delay = <11>;
+					};
+					conf4 {
+						pins = "V11 GMAC1 TXC";
+						skew-delay = <10>;
+					};
+					conf5 {
+						pins = "W8 GMAC0 RXD0", "V9 GMAC0 RXD1",
+						       "Y8 GMAC0 RXD2", "U9 GMAC0 RXD3",
+						       "T7 GMAC0 TXD0", "U6 GMAC0 TXD1",
+						       "V7 GMAC0 TXD2", "U7 GMAC0 TXD3",
+						       "Y12 GMAC1 RXD0", "V12 GMAC1 RXD1",
+						       "T11 GMAC1 RXD2", "W12 GMAC1 RXD3",
+						       "U10 GMAC1 TXD0", "Y10 GMAC1 TXD1",
+						       "W10 GMAC1 TXD2", "T9 GMAC1 TXD3";
+						skew-delay = <7>;
+					};
+					conf6 {
+						groups = "gmii_gmac0_grp";
+						drive-strength = <16>;
+					};
+				};
 			};
 		};
 
@@ -151,6 +192,18 @@
 			pinctrl-0 = <&gpio1_default_pins>;
 		};
 
+		ethernet@60000000 {
+			status = "okay";
+
+			gmac0: ethernet-port@0 {
+				phy-mode = "rgmii";
+				phy-handle = <&phy0>;
+			};
+			gmac1: ethernet-port@1 {
+				status = "disabled";
+			};
+		};
+
 		ata@63000000 {
 			status = "okay";
 		};