boards: renesas: Initial support Renesas EK-RA6M4 board

- Initial support for EK-RA6M4 board

Signed-off-by: Duy Phuong Hoang. Nguyen <duy.nguyen.xa@renesas.com>

boards/renesas/ek_ra6m4/Kconfig.ek_ra6m4

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+# Copyright (c) 2024 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_EK_RA6M4
+	select SOC_R7FA6M4AF3CFB

boards/renesas/ek_ra6m4/board.cmake

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+# Copyright (c) 2024 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+board_runner_args(jlink "--device=R7FA6M4AF")
+
+include(${ZEPHYR_BASE}/boards/common/jlink.board.cmake)

boards/renesas/ek_ra6m4/board.yml

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+board:
+  name: ek_ra6m4
+  vendor: renesas
+  socs:
+  - name: r7fa6m4af3cfb

boards/renesas/ek_ra6m4/doc/index.rst

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+.. _ek_ra6m4:
+
+RA6M4 Evaluation Kit
+####################
+
+Overview
+********
+
+The Renesas RA6M4 group uses the high-performance Arm® Cortex®-M33
+core with TrustZone®. Secure element functionality providing better
+performance, unlimited secure key storage, key management, and lower
+BOM cost, as well as the integrated Ethernet MAC with individual DMA
+ensures high data throughput. The RA6M4 is suitable for IoT applications
+requiring Ethernet, future proof security, large embedded RAM, and low
+active power consumption down to 99uA/MHz running the CoreMark®
+algorithm from Flash.
+
+The key features of the EK-RA6M4 board are categorized in three groups as follow:
+
+**MCU Native Pin Access**
+
+- 200MHz Arm Cortex-M33 based RA6M4 MCU in 144 pins, LQFP package
+- Native pin access through 4 x 40-pin male headers
+- MCU current measurement points for precision current consumption measurement
+- Multiple clock sources - RA6M4 MCU oscillator and sub-clock oscillator crystals,
+  providing precision 24.000 MHz and 32,768 Hz reference clock.
+  Additional low precision clocks are avaialbe internal to the RA6M4 MCU
+
+**System Control and Ecosystem Access**
+
+- USB Full Speed Host and Device (micro-AB connector)
+- Three 5 V input sources
+
+  - USB (Debug, Full Speed)
+  - External power supply (using surface mount clamp test points and power input vias)
+
+- Three Debug modes
+
+  - Debug on-board (SWD)
+  - Debug in (ETM, SWD and JTAG)
+  - Debug out (SWD)
+
+- 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
+  - One SparkFun Qwiic connector
+  - Two Digilent Pmod (SPI and UART) connectors
+  - Arduino (Uno R3) connector
+  - MikroElektronika mikroBUS connector
+
+- MCU boot configuration jumper
+
+**Special Feature Access**
+
+- Ethernet (RJ45 RMII interface)
+- 32 Mb (256 Mb) External Quad-SPI Flash
+- 64 Mb (512 Mb) External Octo-SPI Flash
+
+.. figure:: ek-ra6m4-board.webp
+	:align: center
+	:alt: RA6M4 Evaluation Kit
+
+	EK-RA6M4 Board Functional Area Definitions (Credit: Renesas Electronics Corporation)
+
+Hardware
+********
+Detailed hardware feature for the RA6M4 MCU group can be found at `RA6M4 Group User's Manual Hardware`_
+
+.. figure:: ra6m4-block-diagram.webp
+	:width: 442px
+	:align: center
+	:alt: RA6M4 MCU group feature
+
+	RA6M4 Block diagram (Credit: Renesas Electronics Corporation)
+
+Detailed hardware feature for the EK-RA6M4 MCU can be found at `EK-RA6M4 - User's Manual`_
+
+Supported Features
+==================
+
+The below features are currently supported on Zephyr OS for EK-RA6M4 board:
+
++-----------+------------+----------------------+
+| Interface | Controller | Driver/Component     |
++===========+============+======================+
+| GPIO      | on-chip    | gpio                 |
++-----------+------------+----------------------+
+| MPU       | on-chip    | arch/arm             |
++-----------+------------+----------------------+
+| NVIC      | on-chip    | arch/arm             |
++-----------+------------+----------------------+
+| UART      | on-chip    | serial               |
++-----------+------------+----------------------+
+
+Other hardware features are currently not supported by the port.
+
+Programming and Debugging
+*************************
+
+Applications for the ``ek_ra6m4`` 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-RA6M4 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-RA6M4 - User's Manual`_
+
+  3. Execute west command
+
+	.. code-block:: console
+
+		west flash -r jlink
+
+Debugging
+=========
+
+You can use Segger Ozone (`Segger Ozone Download`_) for a visual debug interface
+
+Once downloaded and installed, open Segger Ozone and configure the debug project
+like so:
+
+* Target Device: R7FA6M4AF
+* Target Interface: SWD
+* Target Interface Speed: 4 MHz
+* Host Interface: USB
+* Program File: <path/to/your/build/zephyr.elf>
+
+**Note:** It's verified that we can debug OK on Segger Ozone v3.30d so please use this or later
+version of Segger Ozone
+
+References
+**********
+- `EK-RA6M4 Website`_
+- `RA6M4 MCU group Website`_
+
+.. _EK-RA6M4 Website:
+   https://www.renesas.com/us/en/products/microcontrollers-microprocessors/ra-cortex-m-mcus/ek-ra6m4-evaluation-kit-ra6m4-mcu-group
+
+.. _RA6M4 MCU group Website:
+   https://www.renesas.com/us/en/products/microcontrollers-microprocessors/ra-cortex-m-mcus/ra6m4-200mhz-arm-cortex-m33-trustzone-high-integration-ethernet-and-octaspi
+
+.. _EK-RA6M4 - User's Manual:
+   https://www.renesas.com/us/en/document/man/ek-ra6m4-v1-users-manual
+
+.. _RA6M4 Group User's Manual Hardware:
+   https://www.renesas.com/us/en/document/man/ra6m4-group-user-s-manual-hardware?r=1333976
+
+.. _Segger Ozone Download:
+   https://www.segger.com/downloads/jlink#Ozone

boards/renesas/ek_ra6m4/ek_ra6m4-pinctrl.dtsi

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+/*
+ * Copyright (c) 2024 Renesas Electronics Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&pinctrl {
+	sci0_default: sci0_default {
+		group1 {
+			/* tx rx */
+			psels = <RA_PSEL(RA_PSEL_SCI_0, 4, 11)>,
+			<RA_PSEL(RA_PSEL_SCI_0, 4, 10)>;
+		};
+	};
+};

boards/renesas/ek_ra6m4/ek_ra6m4.dts

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+/*
+ * Copyright (c) 2024 Renesas Electronics Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+
+#include <renesas/ra/ra6/r7fa6m4af3cfb.dtsi>
+#include <dt-bindings/gpio/gpio.h>
+
+#include "ek_ra6m4-pinctrl.dtsi"
+
+/ {
+	model = "Renesas EK-RA6M4";
+	compatible = "renesas,ra6m4", "renesas,ra";
+
+	chosen {
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+		zephyr,console = &uart0;
+		zephyr,shell-uart = &uart0;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		led1: led1 {
+			gpios = <&ioport4 15 GPIO_ACTIVE_HIGH>;
+			label = "LED1";
+		};
+		led2: led2 {
+			gpios = <&ioport4 4 GPIO_ACTIVE_HIGH>;
+			label = "LED2";
+		};
+		led3: led3 {
+			gpios = <&ioport4 0 GPIO_ACTIVE_HIGH>;
+			label = "LED3";
+		};
+	};
+
+	aliases {
+		led0 = &led1;
+	};
+};
+
+&sci0 {
+	pinctrl-0 = <&sci0_default>;
+	pinctrl-names = "default";
+	status = "okay";
+	uart0: uart {
+		current-speed = <115200>;
+		status = "okay";
+	};
+};
+
+&ioport4 {
+	status = "okay";
+};
+
+&xtal {
+	clock-frequency = <DT_FREQ_M(24)>;
+	mosel = <0>;
+	#clock-cells = <0>;
+	status = "okay";
+};
+
+&subclk {
+	status = "okay";
+};
+
+&pll {
+	source = <RA_PLL_SOURCE_MAIN_OSC>;
+	div = <RA_PLL_DIV_3>;
+	mul = <25 0>;
+	freq = <DT_FREQ_M(200)>;
+	status = "okay";
+};
+
+&pclka {
+	clk_src = <RA_CLOCK_SOURCE_PLL>;
+	clk_div = <RA_SYS_CLOCK_DIV_2>;
+	status = "okay";
+};

boards/renesas/ek_ra6m4/ek_ra6m4.yaml

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+identifier: ek_ra6m4
+name: Renesas EK-RA6M4
+type: mcu
+arch: arm
+ram: 256
+flash: 1024
+toolchain:
+  - zephyr
+  - gnuarmemb
+supported:
+  - gpio

boards/renesas/ek_ra6m4/ek_ra6m4_defconfig

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+# Copyright (c) 2024 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=200000000
+
+# Enable GPIO
+CONFIG_GPIO=y
+CONFIG_PINCTRL=y
+
+# Enable Console
+CONFIG_SERIAL=y
+CONFIG_UART_INTERRUPT_DRIVEN=y
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+
+CONFIG_BUILD_OUTPUT_HEX=y
+CONFIG_BUILD_NO_GAP_FILL=y

tests/drivers/uart/uart_async_api/boards/ek_ra6m4.overlay

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+/*
+ * Copyright (c) 2024 Renesas Electronics Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&pinctrl {
+	sci7_default: sci7_default {
+		group1 {
+			/* tx rx */
+			psels = <RA_PSEL(RA_PSEL_SCI_7, 6, 13)>,
+			<RA_PSEL(RA_PSEL_SCI_7, 6, 14)>;
+		};
+	};
+};
+
+&sci7 {
+	pinctrl-0 = <&sci7_default>;
+	pinctrl-names = "default";
+	status = "okay";
+	dut: uart {
+		current-speed = <115200>;
+		status = "okay";
+	};
+};