boards: renesas: Intial support for EK-RX261 boards

Intial support for EK-RX261 board

Signed-off-by: Hau Ho <hau.ho.xc@bp.renesas.com>

Author: Hau Ho

boards/renesas/ek_rx261/Kconfig.ek_rx261

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+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_EK_RX261
+	select SOC_R5F52618BGFP

boards/renesas/ek_rx261/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=R5F52618" "--iface=FINE" "--speed=1000" "--tool-opt=-jtagconf -1,-1 -autoconnect 1" )
+board_runner_args(rfp "--device=RX200" "--tool=e2l" "--interface=fine" "--erase")
+
+include(${ZEPHYR_BASE}/boards/common/jlink.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/rfp.board.cmake)

boards/renesas/ek_rx261/board.yml

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+board:
+  name: ek_rx261
+  full_name: RX261 Evaluation Kit
+  vendor: renesas
+  socs:
+  - name: r5f52618bgfp

boards/renesas/ek_rx261/ek_rx261-pinctrl.dtsi

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+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&pinctrl {
+	sci6_default: sci6_default {
+		group1 {
+			psels = <RX_PSEL(RX_PSEL_SCI_6, 11, 1)>, /* TX */
+				<RX_PSEL(RX_PSEL_SCI_6, 11, 0)>; /* RX */
+		};
+	};
+};

boards/renesas/ek_rx261/ek_rx261.dts

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+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+
+#include <renesas/r5f52618bgfp.dtsi>
+#include <dt-bindings/gpio/gpio.h>
+#include "ek_rx261-pinctrl.dtsi"
+#include <zephyr/dt-bindings/input/input-event-codes.h>
+
+/ {
+	model = "Renesas EK-RX261 KIT";
+	compatible = "renesas,ek_rx261","renesas,rxv3";
+
+	chosen {
+		zephyr,sram = &sram0;
+		zephyr,flash = &code_flash;
+		zephyr,console = &uart6;
+		zephyr,shell-uart = &uart6;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led1: led1 {
+			gpios = <&ioportj 1 GPIO_ACTIVE_LOW>;
+			label = "LED1";
+		};
+
+		led2: led2 {
+			gpios = <&ioportc 5 GPIO_ACTIVE_LOW>;
+			label = "LED2";
+		};
+
+		led3: led3 {
+			gpios = <&ioporta 3 GPIO_ACTIVE_LOW>;
+			label = "LED3";
+		};
+
+	};
+
+	aliases {
+		led0 = &led1;
+		led1 = &led2;
+		led2 = &led3;
+	};
+};
+
+&xtal {
+	clock-frequency = <DT_FREQ_M(8)>;
+	mosel = <0>;
+	#clock-cells = <0>;
+	status = "okay";
+};
+
+&pll {
+	div = <1>;
+	mul = <RX_PLL_MUL_8>;
+	status = "okay";
+};
+
+&cmt {
+	clock-frequency = <4000000>;
+	status = "okay";
+};
+
+&ioport3 {
+	status = "okay";
+};
+
+&ioporta {
+	status = "okay";
+};
+
+&ioportc {
+	status = "okay";
+};
+
+&ioportd {
+	status = "okay";
+};
+
+&ioportj {
+	status = "okay";
+};
+
+&sci6 {
+	pinctrl-0 = <&sci6_default>;
+	pinctrl-names = "default";
+	status = "okay";
+	uart6: uart {
+		current-speed = <115200>;
+		status = "okay";
+	};
+};

boards/renesas/ek_rx261/ek_rx261.yaml

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+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+identifier: ek_rx261
+name: Renesas EK-RX261
+type: mcu
+arch: rx
+toolchain:
+  - cross-compile
+supported:
+  - gpio
+  - serial
+  - timer
+ram: 128
+flash: 512
+testing:
+  timeout_multiplier: 5

boards/renesas/ek_rx261/ek_rx261_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