boards: renesas: Add ethernet support for ek_ra6m3

Add ethernet support for ek_ra6m3.

Signed-off-by: Ta Minh Nhat <nhat-minh.ta.yn@bp.renesas.com>

Author: Ta Minh Nhat

boards/renesas/ek_ra6m3/Kconfig.defconfig

@@ -0,0 +1,13 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+if BOARD_EK_RA6M3
+
+if NETWORKING
+
+config NET_L2_ETHERNET
+	default y
+
+endif # NETWORKING
+
+endif # BOARD_EK_RA6M3

boards/renesas/ek_ra6m3/ek_ra6m3-pinctrl.dtsi

@@ -69,4 +69,20 @@
 			drive-strength = "high";
 		};
 	};
+
+	ether_default: ether_default {
+		group1 {
+			psels = <RA_PSEL(RA_PSEL_ETH_RMII, 4, 1)>, /* ET0_MDC */
+				<RA_PSEL(RA_PSEL_ETH_RMII, 4, 2)>, /* ET0_MDIO */
+				<RA_PSEL(RA_PSEL_ETH_RMII, 4, 5)>, /* RMII0_TXD_EN_B */
+				<RA_PSEL(RA_PSEL_ETH_RMII, 4, 6)>, /* RMII0_TXD1_BR */
+				<RA_PSEL(RA_PSEL_ETH_RMII, 7, 0)>, /* RMII0_TXD0_B */
+				<RA_PSEL(RA_PSEL_ETH_RMII, 7, 1)>, /* REF50CK0_B */
+				<RA_PSEL(RA_PSEL_ETH_RMII, 7, 2)>, /* RMII0_RXD0_B */
+				<RA_PSEL(RA_PSEL_ETH_RMII, 7, 3)>, /* RMII0_RXD1_B */
+				<RA_PSEL(RA_PSEL_ETH_RMII, 7, 4)>, /* RMII0_RX_ER_B */
+				<RA_PSEL(RA_PSEL_ETH_RMII, 7, 5)>; /* RMII0_CRS_DV_B */
+			drive-strength = "high";
+		};
+	};
 };

boards/renesas/ek_ra6m3/ek_ra6m3.dts

@@ -196,3 +196,21 @@
 &wdt {
 	status = "okay";
 };
+
+&eth {
+	local-mac-address = [00 11 22 33 44 57];
+	status = "okay";
+	phy-handle = <&phy>;
+};
+
+&mdio {
+	pinctrl-0 = <&ether_default>;
+	pinctrl-names = "default";
+	status = "okay";
+
+	phy: ethernet-phy@5 {
+		compatible = "ethernet-phy";
+		reg = <0>;
+		status = "okay";
+	};
+};