boards: renesas: Add minimal support for board RSK+ for RZ/N2L

Add minimal support for board RSK+ for RZ/N2L

Signed-off-by: Nhut Nguyen <nhut.nguyen.kc@renesas.com>
Signed-off-by: Hoang Nguyen <hoang.nguyen.jx@bp.renesas.com>

boards/renesas/rzn2l_rsk/Kconfig.rzn2l_rsk

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+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_RZN2L_RSK
+	select SOC_R9A07G084M04GBG

boards/renesas/rzn2l_rsk/board.cmake

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+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+board_runner_args(jlink "--device=R9A07G084M04GBG")
+include(${ZEPHYR_BASE}/boards/common/jlink.board.cmake)

boards/renesas/rzn2l_rsk/board.yml

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+board:
+  name: rzn2l_rsk
+  full_name: Renesas Starter Kit+ for RZ/N2L
+  vendor: renesas
+  socs:
+  - name: r9a07g084m04gbg

boards/renesas/rzn2l_rsk/doc/index.rst

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+.. zephyr:board:: rzn2l_rsk
+
+Overview
+********
+
+Renesas Starter Kit+ for RZ/N2L is for evaluation or development using the RZ/N2L MPU.
+With the on-board emulator, you can start evaluation by simply connecting the bundled cable with
+your PC. This product has rich functional ICs such as Gigabit Ethernet PHY and Octal Flash,
+you can fully evaluate functions without an extension board.
+
+* On-board RZ/N2L MPU 225-pin (R9A07G084M04GBG)
+* Rich functional ICs such as Gigabit Ethernet PHY and Octal Flash are mounted,
+  so functions of target MPU can be fully evaluated
+* Generic interfaces such as Pmod/Grove/Qwiic/mikroBUS
+* Pin headers for external extension enable you to evaluate many use cases
+* Emulator circuit is mounted, and program debugging can be started by simply connecting USB cable
+  to PC (two USB cables are included, one for emulator and the other for power supply)
+* On-board memory components:
+
+  * SDRAM (256MBit)
+  * NOR Flash (256MBit)
+  * Octa Flash (512MBit)
+  * HyperRAM (64Mbit)
+  * QSPI Serial Flash (512Mbit)
+  * I2C EEPROM (32Kbit)
+
+* Communication interfaces include:
+
+  * Debug interfaces (J-Link OB, MIPI-10, MIPI-20)
+  * Ethernet
+  * CAN
+  * USB
+  * RS485
+  * UART
+  * I2C
+  * SPI
+
+Hardware
+********
+
+The Renesas RZ/N2L MPU documentation can be found at `RZ/N2L Group Website`_
+
+.. figure:: rzn2l_block_diagram.webp
+	:width: 500px
+	:align: center
+	:alt: RZ/N2L group feature
+
+	RZ/N2L block diagram (Credit: Renesas Electronics Corporation)
+
+Detailed hardware features for the board can be found at `RZ/N2L-RSK Website`_
+
+Supported Features
+==================
+
+.. zephyr: board-supported-hw::
+
+Connections and IOs
+===================
+
+By default, the board is configured for use with:
+
+* UART0 connected to the USB serial port (pins H15, G11),
+* UART3 connected to the PMOD Header (J25, pins E14, E15),
+* LEDs defined as ``led0``, ``led1``, ``led2`` and ``led3``,
+
+The Zephyr console uses UART0.
+
+Programming and Debugging
+*************************
+
+Applications for the ``rzn2l_rsk`` board can be
+built, flashed, and debugged in the usual way. See :ref:`build_an_application`
+and :ref:`application_run` for more details on building and running.
+
+To use J-Link OB on RSK+RZN2L,
+
+1. Open the jumper pin (J9) for switching the debug connection.
+
+2. Connect the micro-USB type-B to J-Link OB USB connector (J10), and then the LED4 is lighted.
+
+Console
+=======
+
+The UART port is accessed by USB-Serial port (CN16).
+
+Debugging
+=========
+
+Here is an example for building and debugging with the :zephyr:code-sample:`hello_world` application.
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/hello_world
+   :board: rzn2l_rsk
+   :goals: build debug
+
+Flashing
+=========
+
+Before using ``flash`` command, the board must be set to xSPI boot mode.
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/hello_world
+   :board: rzn2l_rsk
+   :goals: build flash
+
+References
+**********
+
+.. target-notes::
+
+.. _RZ/N2L Group Website:
+   https://www.renesas.com/en/products/microcontrollers-microprocessors/rz-mpus/rzn2l-integrated-tsn-compliant-3-port-gigabit-ethernet-switch-enables-various-industrial-applications
+
+.. _RZ/N2L-RSK Website:
+   https://www.renesas.com/en/products/microcontrollers-microprocessors/rz-mpus/rzn2l-rsk-renesas-starter-kit-rzn2l

boards/renesas/rzn2l_rsk/rzn2l_rsk.dts

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+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+#include <arm/renesas/rz/rzn/r9a07g084.dtsi>
+#include "rzn2l_rsk-pinctrl.dtsi"
+#include <zephyr/dt-bindings/input/input-event-codes.h>
+
+/ {
+	model = "Renesas Starter Kit+ for RZ/N2L";
+	compatible = "renesas,rzn2l-rsk";
+
+	chosen {
+		zephyr,sram = &atcm;
+		zephyr,flash = &xspi0_cs0;
+		zephyr,code-partition = &slot0_partition;
+		zephyr,console = &uart0;
+		zephyr,shell-uart = &uart0;
+	};
+
+	aliases {
+		led0 = &led0;
+		led1 = &led1;
+		sw0 = &sw1;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led0: led0 {
+			gpios = <&gpio18 2 0>;
+			label = "led0";
+		};
+
+		led1: led1 {
+			gpios = <&gpio22 3 0>;
+			label = "led1";
+		};
+
+		led2: led2 {
+			gpios = <&gpio4 1 0>;
+			label = "led2";
+		};
+
+		led3: led3 {
+			gpios = <&gpio17 3 0>;
+			label = "led3";
+		};
+	};
+
+	gpio_keys {
+		compatible = "gpio-keys";
+
+		sw1: sw1 {
+			label = "sw1";
+			gpios = <&gpio16 3 0>;
+			zephyr,code = <INPUT_KEY_0>;
+		};
+
+		sw2: sw2 {
+			label = "sw2";
+			gpios = <&gpio5 4 0>;
+			zephyr,code = <INPUT_KEY_1>;
+		};
+	};
+};
+
+&sci0 {
+	pinctrl-0 = <&sci0_default>;
+	pinctrl-names = "default";
+	status = "okay";
+
+	uart0: uart {
+		current-speed = <115200>;
+		status = "okay";
+	};
+};
+
+&gpio18 {
+	status = "okay";
+};
+
+&gpio22 {
+	status = "okay";
+};
+
+&gpio4 {
+	status = "okay";
+};
+
+&gpio17 {
+	status = "okay";
+};
+
+&irq7 {
+	trigger-type = "falling";
+	pinctrl-0 = <&irq7_default>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&gpio16 {
+	irqs = <3 7>;
+	status = "okay";
+};
+
+&gpio5 {
+	status = "okay";
+};

boards/renesas/rzn2l_rsk/rzn2l_rsk.yaml

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+identifier: rzn2l_rsk
+name: Renesas Starter Kit+ for RZ/N2L
+type: mcu
+arch: arm
+toolchain:
+  - zephyr
+supported:
+  - uart
+  - gpio
+vendor: renesas

boards/renesas/rzn2l_rsk/rzn2l_rsk_defconfig

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+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_XIP=n
+
+# Enable UART driver
+CONFIG_SERIAL=y
+CONFIG_UART_CONSOLE=y
+CONFIG_UART_INTERRUPT_DRIVEN=y
+
+# Enable console
+CONFIG_CONSOLE=y