diff --git a/arch/arm64/boot/dts/renesas/rzg3l-smarc-som.dtsi b/arch/arm64/boot/dts/renesas/rzg3l-smarc-som.dtsi
index c7227a865fa4..f53e6332e2f4 100644
--- a/arch/arm64/boot/dts/renesas/rzg3l-smarc-som.dtsi
+++ b/arch/arm64/boot/dts/renesas/rzg3l-smarc-som.dtsi
@@ -10,6 +10,7 @@ / {
 
 	aliases {
 		ethernet0 = &eth0;
+		ethernet1 = &eth1;
 	};
 
 	memory@48000000 {
@@ -32,6 +33,19 @@ &eth0_rxc_rx_clk {
 	clock-frequency = <125000000>;
 };
 
+&eth1 {
+	phy-handle = <&phy1>;
+	phy-mode = "rgmii-id";
+
+	pinctrl-0 = <&eth1_pins>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&eth1_rxc_rx_clk {
+	clock-frequency = <125000000>;
+};
+
 &extal_clk {
 	clock-frequency = <24000000>;
 };
@@ -56,6 +70,26 @@ phy0: ethernet-phy@7 {
 	};
 };
 
+&mdio1 {
+	phy1: ethernet-phy@7 {
+		compatible = "ethernet-phy-id0022.1640";
+		reg = <7>;
+		interrupts-extended = <&icu 16 IRQ_TYPE_LEVEL_LOW>;
+		rxc-skew-psec = <1400>;
+		txc-skew-psec = <1400>;
+		rxdv-skew-psec = <0>;
+		txen-skew-psec = <0>;
+		rxd0-skew-psec = <0>;
+		rxd1-skew-psec = <0>;
+		rxd2-skew-psec = <0>;
+		rxd3-skew-psec = <0>;
+		txd0-skew-psec = <0>;
+		txd1-skew-psec = <0>;
+		txd2-skew-psec = <0>;
+		txd3-skew-psec = <0>;
+	};
+};
+
 &pinctrl {
 	eth0_pins: eth0 {
 		txc {
@@ -83,4 +117,31 @@ ctrl {
 				 power-source = <1800>;
 		};
 	};
+
+	eth1_pins: eth1 {
+		txc {
+			pinmux = <RZG3L_PORT_PINMUX(E, 1, 1)>;  /* ETH1_TXC_REF_CLK */
+			power-source = <1800>;
+			output-enable;
+			drive-strength-microamp = <5200>;
+		};
+
+		ctrl {
+			pinmux = <RZG3L_PORT_PINMUX(D, 0, 1)>, /* MDIO */
+				 <RZG3L_PORT_PINMUX(D, 1, 1)>, /* MDC */
+				 <RZG3L_PORT_PINMUX(D, 2, 1)>, /* RX_CTL */
+				 <RZG3L_PORT_PINMUX(D, 3, 1)>, /* TX_CTL */
+				 <RZG3L_PORT_PINMUX(E, 0, 1)>, /* RXC */
+				 <RZG3L_PORT_PINMUX(E, 2, 1)>, /* TXD0 */
+				 <RZG3L_PORT_PINMUX(E, 3, 1)>, /* TXD1 */
+				 <RZG3L_PORT_PINMUX(E, 4, 1)>, /* TXD2 */
+				 <RZG3L_PORT_PINMUX(E, 5, 1)>, /* TXD3 */
+				 <RZG3L_PORT_PINMUX(E, 6, 1)>, /* RXD0 */
+				 <RZG3L_PORT_PINMUX(E, 7, 1)>, /* RXD1 */
+				 <RZG3L_PORT_PINMUX(F, 0, 1)>, /* RXD2 */
+				 <RZG3L_PORT_PINMUX(F, 1, 1)>, /* RXD3 */
+				 <RZG3L_PORT_PINMUX(F, 2, 15)>; /* PHY_INTR */
+				 power-source = <1800>;
+		};
+	};
 };