boards: renesas: Add support Renesas ek_ra4c1 board

boards/renesas/ek_ra4c1/Kconfig.ek_ra4c1

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+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_EK_RA4C1
+	select SOC_R7FA4C1BD3CFP

boards/renesas/ek_ra4c1/board.cmake

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+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+board_runner_args(jlink "--device=R7FA4C1BD")
+
+include(${ZEPHYR_BASE}/boards/common/jlink.board.cmake)

boards/renesas/ek_ra4c1/board.yml

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+board:
+  name: ek_ra4c1
+  full_name: RA4C1 Evaluation Kit
+  vendor: renesas
+  socs:
+  - name: r7fa4c1bd3cfp

boards/renesas/ek_ra4c1/doc/index.rst

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+.. zephyr:board:: ek_ra4c1
+
+Overview
+********
+
+The EK-RA4C1, an Evaluation Kit for the RA4 Series, enables users to seamlessly evaluate
+the features of the RA4C1 MCU group and develop embedded systems applications using
+Flexible Software Package (FSP) and the e2 studio IDE. The users can use rich on-board
+features along with their choice of popular ecosystems add-ons to bring their big ideas to life.
+
+The key features of the EK-RA4C1 board are categorized in three groups (consistent with
+the architecture of the kit) as follows:
+
+**Renesas RA4C1 Microcontroller Group**
+
+- R7FA4C1BD3CFP MCU (referred to as RA MCU)
+- 80 MHz, Arm® Cortex®-M33 core
+- 512 KB Code Flash, 96 KB SRAM
+- 100 pins, LQFP package
+- Native pin access through 3 x 26-pin headers (not populated)
+- Tamper Detection embedded into J4
+- Segment LCD Board Interface
+- MCU current measurement points for precision current consumption measurement
+- Multiple clock sources – RA MCU oscillator and sub-clock oscillator crystals,
+providing precision 8.000 MHz and 32,768 Hz reference clocks. Additional low-precision
+clocks are available internal to the RA MCU
+
+**System Control and Ecosystem Access**
+
+- Two 5 V input sources
+
+	- USB (Debug)
+	- External Power Supply 2-pin header (not populated)
+
+- Three Debug modes
+
+	- Debug on-board (SWD)
+	- Debug in (SWD)
+	- Debug out (SWD, SWO and JTAG)
+
+- User LEDs and buttons
+
+	- Three User LEDs (red, blue, green)
+	- Power LED (white) indicating availability of regulated power
+	- Debug LED (yellow) indicating the debug connection
+	- Two User buttons
+	- One Reset button
+
+- Five most popular ecosystems expansions
+
+	- Two Seeed Grove® system (I2C/Analog) connectors (not populated)
+   - SparkFun® Qwiic® connector (not populated)
+   - Two Digilent PmodTM (SPI, UART and I2C) connectors
+   - Arduino™ (UNO R3) connector
+   - MikroElektronikaTM mikroBUS connector (not populated)
+
+- MCU boot configuration jumper
+- Low Voltage Mode voltage input and operation
+
+**Special Feature Access**
+- 32 MB (256 Mb) External Quad-SPI Flash
+- CAN-FD (3-pin header)
+- External Battery Connector
+- Configuration Switch
+
+Hardware
+********
+
+Detailed hardware features can be found at:
+- RA4C1 MCU:  `RA4C1 Group User's Manual Hardware`_
+- EK-RA4C1 board: `EK-RA4C1 - User's Manual`_
+
+Supported Features
+==================
+
+.. zephyr:board-supported-hw::
+
+.. note::
+
+Other hardware features are currently not supported by the port.
+
+Programming and Debugging
+*************************
+
+Applications for the ``ek_ra4c1`` board target configuration 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.
+
+Flashing
+========
+
+Program can be flashed to EK-RA4C1 via the on-board SEGGER J-Link debugger.
+SEGGER J-link's drivers are avaialbe at https://www.segger.com/downloads/jlink/
+
+To flash the program to board
+
+  1. Connect to J-Link OB via USB port to host PC
+
+  2. Make sure J-Link OB jumper is in default configuration as describe in `EK-RA4C1 - User's Manual`_
+
+  3. Execute west command
+
+	.. code-block:: console
+
+		west flash -r jlink
+
+References
+**********
+- `EK-RA4C1 Website`_
+- `RA4C1 MCU group Website`_
+
+.. _EK-RA4C1 Website:
+   http://www.renesas.com/ek-ra4c1
+
+.. _RA4C1 MCU group Website:
+   http://www.renesas.com/ra4c1
+
+.. _EK-RA4C1 - User's Manual:
+   https://www.renesas.com/us/en/document/mat/ek-ra4c1-v1-users-manual
+
+.. _RA4C1 Group User's Manual Hardware:
+   https://www.renesas.com/us/en/document/man/ra4c1-group-users-manual-hardware

boards/renesas/ek_ra4c1/ek_ra4c1-pinctrl.dtsi

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+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&pinctrl {
+	sci4_default: sci4_default {
+		group1 {
+			/* tx rx */
+			psels = <RA_PSEL(RA_PSEL_SCI_0, 2, 7)>,
+			<RA_PSEL(RA_PSEL_SCI_0, 2, 6)>;
+		};
+	};
+
+	spi0_default: spi0_default {
+		group1 {
+			/* MISO MOSI RSPCK SSL */
+			psels = <RA_PSEL(RA_PSEL_SPI, 1, 10)>,
+			<RA_PSEL(RA_PSEL_SPI, 1, 9)>,
+			<RA_PSEL(RA_PSEL_SPI, 1, 11)>,
+			<RA_PSEL(RA_PSEL_SPI, 1, 12)>;
+		};
+	};
+
+	adc0_default: adc0_default {
+		group1 {
+			/* input */
+			psels = <RA_PSEL(RA_PSEL_ADC, 0, 2)>;
+			renesas,analog-enable;
+		};
+	};
+
+	pwm4_default: pwm4_default {
+		group1 {
+			/* GTIOC4A GTIOC4B */
+			psels = <RA_PSEL(RA_PSEL_GPT1, 3, 2)>,
+				<RA_PSEL(RA_PSEL_GPT1, 3, 1)>;
+		};
+	};
+
+	iic1_default: iic1_default {
+		group1 {
+			/* SCL1 SDA1 */
+			psels = <RA_PSEL(RA_PSEL_I2C, 4, 0)>,
+			<RA_PSEL(RA_PSEL_I2C, 4, 1)>;
+			drive-strength = "medium";
+		};
+	};
+
+	canfd0_default: canfd0_default {
+		group1 {
+			/* CRX0 CTX0 */
+			psels = <RA_PSEL(RA_PSEL_CANFD, 1, 3)>,
+			<RA_PSEL(RA_PSEL_CANFD, 1, 2)>;
+			drive-strength = "high";
+		};
+	};
+};