boards: renesas: Add boards support for RX140 MCU

boards/renesas/fpb_rx140/Kconfig.fpb_rx140

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+# Copyright (c) 2024 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_FPB_RX140
+	select SOC_R5F51406

boards/renesas/fpb_rx140/board.cmake

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+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+# options after "--tool-opt=" are directly passed to the tool. So instead of "--iface=JTAG" you could also write "--tool-opt=-if JTAG"
+board_runner_args(jlink "--device=R5F51406" "--iface=FINE" "--speed=1000" "--tool-opt=-jtagconf -1,-1 -autoconnect 1")
+board_runner_args(rfp "--device=RX100" "--tool=e2l" "--interface=fine" "--erase")
+
+include(${ZEPHYR_BASE}/boards/common/rfp.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/jlink.board.cmake)

boards/renesas/fpb_rx140/board.yml

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+board:
+  name: fpb_rx140
+  full_name: Fast Prototyping Board for RX140
+  vendor: renesas
+  socs:
+    - name: r5f51406

boards/renesas/fpb_rx140/doc/index.rst

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+.. zephyr:board:: fpb_rx140
+
+Overview
+********
+
+The Fast Prototyping Board for RX140 MCU Group comes equipped with an RX140 MCU
+(R5F51406BGFN). The board is inexpensive for RX140 evaluation and prototype development of
+various applications. It has an emulator circuit so you can write/debug programs just by
+connecting it to a PC with a USB cable. In addition, it has high expandability with Arduino Uno
+and two Pmod™ connectors as standard, and through-hole access to all pins of the
+microcontroller.
+
+**MCU Native Pin Access**
+
+- R5F51406ADFN MCU
+
+   - Max 48MHz, 32-bit RXv2 core (RXv2)
+   - 256 KB Flash, 64 KB RAM
+   - 80-pin, LFQFP package
+
+- Native pin access through 2 x 40-pin male headers (not fitted)
+- RX MCU current measurement point for precision current consumption measurement
+- RX MCU on-chip oscillators as main clock
+- Providing 32.768 kHz crystal oscillator as sub clock
+
+**System Control and Ecosystem Access**
+
+- Two 5 V input sources
+
+   - USB
+   - External power supply (using 2-pin header [not fitted])
+
+- On-board debugger / programmer (E2 emulator On Board (referred as E2OB, FINE Interface))
+
+- User LEDs and switches
+
+   - Two User LEDs (green)
+   - Power LED (green) indicating availability of regulated power
+   - Debug LED (yellow) indicating the debug connection
+   - One User switch
+   - One Reset switch
+
+- Two popular ecosystem expansions
+
+   - Two Digilent PmodTM
+   - Arduino® (Uno R3) connector
+
+Hardware
+********
+Detailed hardware features can be found at:
+
+- RX140 MCU: `RX140 Group User's Manual Hardware`_
+- FPB-RX140: `FPB_RX140 - User's Manual`_
+
+Supported Features
+==================
+
+.. zephyr:board-supported-hw::
+
+Programming and Debugging
+*************************
+
+.. zephyr:board-supported-runners::
+
+Applications for the ``fpb_rx140`` board can be built, flashed, and debugged using standard
+Zephyr workflows. Refer to :ref:`build_an_application` and :ref:`application_run` for more details.
+
+**Note:** Currently, the RX140 is built and programmed using the Renesas GCC RX toolchain.
+Please follow the steps below to program it onto the board:
+
+  - Download and install GCC for RX toolchain:
+
+    https://llvm-gcc-renesas.com/rx-download-toolchains/
+
+  - Set env variable:
+
+   .. code-block:: console
+
+      export ZEPHYR_TOOLCHAIN_VARIANT=cross-compile
+      export CROSS_COMPILE=<Path/to/your/toolchain>/bin/rx-elf-
+
+  - Build the Blinky Sample for FPB-RX140
+
+   .. code-block:: console
+
+      cd ~/zephyrproject/zephyr
+      west build -p always -b fpb_rx140 samples/basic/blinky
+
+Flashing
+========
+
+The program can be flashed to RSK-RX140 using the **E2OB** by connecting the board to the host PC
+and open Jumper J4.
+Here’s an example for building and flashing the :zephyr:code-sample:`hello_world` application.
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/hello_world
+   :board: rsk_rx140
+   :goals: build flash
+
+Debugging
+=========
+
+You can use `Renesas Debug extension`_ on Visual Studio Code for a visual debug interface.
+The configuration for launch.json is as below.
+
+.. code-block:: json
+
+  {
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "renesas-hardware",
+            "request": "launch",
+            "name": "RX140 Renesas Debugging E2lite",
+            "target": {
+                "deviceFamily": "RX",
+                "device": "R5F51406",
+                "debuggerType": "E2LITE"
+                "serverParameters": [
+                    "-uUseFine=", "1",
+                    "-w=", "0",
+                ],
+            }
+        }
+    ]
+  }
+
+References
+**********
+
+- `FPB_RX140 Website`_
+- `RX140 MCU group Website`_
+
+.. _FPB_RX140 Website:
+   https://www.renesas.com/en/design-resources/boards-kits/fpb-rx140
+
+.. _RX140 MCU group Website:
+   https://www.renesas.com/en/products/rx140
+
+.. _FPB_RX140 - User's Manual:
+   https://www.renesas.com/en/document/mat/fpb-rx140-v1-users-manual
+
+.. _RX140 Group User's Manual Hardware:
+   https://www.renesas.com/en/document/mah/rx140-group-users-manual-hardware-rev120
+
+.. _Renesas Debug extension:
+   https://marketplace.visualstudio.com/items?itemName=RenesasElectronicsCorporation.renesas-debug

boards/renesas/fpb_rx140/fpb_rx140-pinctrl.dtsi

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+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&pinctrl {
+	sci5_default: sci5_default {
+		group1 {
+			psels = <RX_PSEL(RX_PSEL_SCI_5, 10, 4)>, /* TX */
+				<RX_PSEL(RX_PSEL_SCI_5, 10, 3)>; /* RX */
+		};
+	};
+};

boards/renesas/fpb_rx140/fpb_rx140.dts

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+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+
+#include <renesas/r5f51406.dtsi>
+#include <dt-bindings/gpio/gpio.h>
+#include "fpb_rx140-pinctrl.dtsi"
+
+/ {
+	model = "Renesas FPB+RX140 KIT";
+	compatible = "renesas,fpb_rx140";
+
+	chosen {
+		zephyr,sram = &sram0;
+		zephyr,flash = &code_flash;
+		zephyr,flash-controller = &flash;
+		zephyr,console = &uart5;
+		zephyr,shell-uart = &uart5;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led1: led1 {
+			gpios = <&ioport2 0 GPIO_ACTIVE_LOW>;
+			label = "LED1";
+		};
+
+		led2: led2 {
+			gpios = <&ioport3 2 GPIO_ACTIVE_LOW>;
+			label = "LED2";
+		};
+	};
+
+	aliases {
+		led0 = &led1;
+		led1 = &led2;
+	};
+};
+
+&subclk {
+	status = "okay";
+};
+
+&pclkblock {
+	clocks = <&hoco>;
+};
+
+&cmt {
+	clock-frequency = <3000000>;
+	status = "okay";
+};
+
+&ioport2 {
+	status = "okay";
+};
+
+&ioport3 {
+	status = "okay";
+};
+
+&sci5 {
+	pinctrl-0 = <&sci5_default>;
+	pinctrl-names = "default";
+	status = "okay";
+
+	uart5: uart {
+		current-speed = <115200>;
+		status = "okay";
+	};
+};

boards/renesas/fpb_rx140/fpb_rx140.yaml

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+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+identifier: fpb_rx140
+name: Fast Prototyping Board for RX140
+type: mcu
+arch: rx
+toolchain:
+  - cross-compile
+supported:
+  - gpio
+  - serial
+  - timer
+ram: 64
+flash: 256

boards/renesas/fpb_rx140/fpb_rx140_defconfig

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

boards/renesas/rsk_rx140/Kconfig.rsk_rx140

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+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_RSK_RX140
+	select SOC_R5F51406

boards/renesas/rsk_rx140/board.cmake

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+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+# options after "--tool-opt=" are directly passed to the tool. So instead of "--iface=JTAG" you could also write "--tool-opt=-if JTAG"
+board_runner_args(jlink "--device=R5F51406" "--iface=FINE" "--speed=1000" "--tool-opt=-jtagconf -1,-1 -autoconnect 1")
+board_runner_args(rfp "--device=RX100" "--tool=e2l" "--interface=fine" "--erase")
+
+include(${ZEPHYR_BASE}/boards/common/rfp.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/jlink.board.cmake)

boards/renesas/rsk_rx140/board.yml

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+board:
+  name: rsk_rx140
+  full_name: Renesas Starter Kit for RX140
+  vendor: renesas
+  socs:
+    - name: r5f51406