boards: st: stm32n6570_dk: Add ethernet node

Add ethernet node

Signed-off-by: IBEN EL HADJ MESSAOUD Marwa <[email protected]>

Author: marwaiehm-st

boards/st/stm32n6570_dk/Kconfig.defconfig

@@ -0,0 +1,15 @@
+# STM32N6570 DISCOVERY board configuration
+
+# Copyright (c) 2025 STMicroelectronics
+# SPDX-License-Identifier: Apache-2.0
+
+if BOARD_STM32N6570_DK
+
+if NETWORKING
+
+config NET_L2_ETHERNET
+	default y
+
+endif # NETWORKING
+
+endif # BOARD_STM32N6570_DK

boards/st/stm32n6570_dk/doc/index.rst

@@ -80,6 +80,8 @@ The Zephyr ``stm32n6570_dk`` board supports the following hardware features:
 | UART      | on-chip    | serial port-polling;                |
 |           |            | serial port-interrupt               |
 +-----------+------------+-------------------------------------+
+| ETHERNET  | on-chip    | ethernet                            |
++-----------+------------+-------------------------------------+
 
 
 Other hardware features are not yet supported on this Zephyr port.

boards/st/stm32n6570_dk/stm32n6570_dk_common.dtsi

@@ -102,3 +102,34 @@
 	current-speed = <115200>;
 	status = "okay";
 };
+
+&mac {
+	status = "okay";
+	pinctrl-0 = <&eth1_rgmii_gtx_clk_pf0
+		     &eth1_rgmii_clk125_pf2
+		     &eth1_rgmii_rx_clk_pf7
+		     &eth1_rgmii_rxd2_pf8
+		     &eth1_rgmii_rxd3_pf9
+		     &eth1_rgmii_rx_ctl_pf10
+		     &eth1_rgmii_tx_ctl_pf11
+		     &eth1_rgmii_txd1_pf13
+		     &eth1_rgmii_txd0_pf12
+		     &eth1_rgmii_rxd0_pf14
+		     &eth1_rgmii_rxd1_pf15
+		     &eth1_rgmii_txd2_pg3
+		     &eth1_rgmii_txd3_pg4
+		     &eth1_phy_intn_pd3>;
+	pinctrl-names = "default";
+};
+
+&mdio {
+	status = "okay";
+	pinctrl-0 = <&eth1_mdio_pd12 &eth1_mdc_pd1>;
+	pinctrl-names = "default";
+
+	ethernet-phy@0 {
+		compatible = "ethernet-phy";
+		reg = <0x0>;
+		status = "okay";
+	};
+};

boards/st/stm32n6570_dk/stm32n6570_dk_defconfig

@@ -19,3 +19,9 @@ CONFIG_HW_STACK_PROTECTION=y
 
 # No internal Flash
 CONFIG_XIP=n
+
+# Enable RGMII mode for the STM32 Ethernet HAL driver
+CONFIG_ETH_STM32_HAL_RGMII=y
+
+# Set the Ethernet speed to 1000 Mbps (1 Gbps) for STM32
+CONFIG_ETH_STM32_SPEED_1000M=y