boards: gd32e507z_eval: add initial support

Add initial support for the GD32E507Z-EVAL board. Only basic peripherals
are enabled for now:

- UART
- GPIO (LEDs, keys)
- PWM

Others, e.g. I2C, EEPROM, DAC, etc. require further testing and likely
some driver adjustments.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>

boards/arm/gd32e507z_eval/Kconfig.board

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+# Copyright (c) 2022, Teslabs Engineering S.L.
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_GD32E507Z_EVAL
+	bool "GigaDevice GD32E507Z-EVAL"
+	depends on SOC_GD32E507

boards/arm/gd32e507z_eval/Kconfig.defconfig

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+# Copyright (c) 2022 Teslabs Engineering S.L.
+# SPDX-License-Identifier: Apache-2.0
+
+if BOARD_GD32E507Z_EVAL
+
+config BOARD
+	default "gd32e507z_eval"
+
+endif # BOARD_GD32E507Z_EVAL

boards/arm/gd32e507z_eval/board.cmake

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+# Copyright (c) 2022, Teslabs Engineering S.L.
+# SPDX-License-Identifier: Apache-2.0
+
+board_runner_args(pyocd "--target=gd32e507ze")
+board_runner_args(
+  jlink
+  "--device=GD32E507ZE" "--iface=jtag" "--tool-opt=-JTAGConf -1,-1"
+)
+
+include(${ZEPHYR_BASE}/boards/common/pyocd.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/jlink.board.cmake)

boards/arm/gd32e507z_eval/doc/index.rst

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+.. _gd32e507z_eval:
+
+GigaDevice GD32E507Z-EVAL
+#########################
+
+Overview
+********
+
+The GD32E507Z-EVAL board is a hardware platform that enables prototyping
+on GD32E507ZE Cortex-M33 High Performance MCU.
+
+The GD32E507ZE features a single-core ARM Cortex-M33 MCU which can run up
+to 180 MHz with flash accesses zero wait states, 512kiB of Flash, 128kiB of
+SRAM and 112 GPIOs.
+
+.. image:: img/gd32e507z_eval.jpg
+     :align: center
+     :alt: gd32e507z_eval
+
+Hardware
+********
+
+- GD32E507ZET6 MCU
+- AT24C02C 2Kb EEPROM
+- GD25Q16 16Mbit SPI and QSPI NOR Flash
+- GD9FU1G8F2A 1Gbit NAND Flash
+- Micron MT48LC16M16A2P-6AIT 256Mbit SDRAM
+- 4 x User LEDs
+- 1 x Joystick (L/R/U/D/C)
+- 1 x USART (connected to USB VCOM at J1 connector)
+- 1 x POT connected to an ADC input
+- Headphone interface
+- USB FS connector
+- 1 x CAN (includes SN65HVD230 PHY)
+- Ethernet Interface
+- 3.2" RGB-LCD (320x240)
+- GD-Link on board programmer
+- J-Link/JTAG connector
+
+For more information about the GD32E507 SoC and GD32E507Z-EVAL board:
+
+- `GigaDevice Cortex-M33 High Performance SoC Website`_
+- `GD32E507X Datasheet`_
+- `GD32E50X User Manual`_
+- `GD32E507Z-EVAL User Manual`_
+
+Supported Features
+==================
+
+The board configuration supports the following hardware features:
+
+.. list-table::
+   :header-rows: 1
+
+   * - Peripheral
+     - Kconfig option
+     - Devicetree compatible
+   * - EXTI
+     - :kconfig:option:`CONFIG_GD32_EXTI`
+     - :dtcompatible:`gd,gd32-exti`
+   * - GPIO
+     - :kconfig:option:`CONFIG_GPIO`
+     - :dtcompatible:`gd,gd32-gpio`
+   * - NVIC
+     - N/A
+     - :dtcompatible:`arm,v8m-nvic`
+   * - PWM
+     - :kconfig:option:`CONFIG_PWM`
+     - :dtcompatible:`gd,gd32-pwm`
+   * - SYSTICK
+     - N/A
+     - N/A
+   * - USART
+     - :kconfig:option:`CONFIG_SERIAL`
+     - :dtcompatible:`gd,gd32-usart`
+
+Serial Port
+===========
+
+The GD32E507Z-EVAL board has one serial communication port. The default port
+is USART0 with TX connected at PA9 and RX at PA10. USART0 is exposed as a
+virtual COM port via the J1 USB connector.
+
+Programming and Debugging
+*************************
+
+Before programming your board make sure to configure boot jumpers as
+follows:
+
+- JP3/4: Select 2-3 for both (boot from user memory)
+
+Using GD-Link or J-Link
+=======================
+
+The board comes with an embedded GD-Link programmer. It can be used with pyOCD
+provided you install the necessary CMSIS-Pack:
+
+.. code-block:: console
+
+   pyocd pack install gd32e507ze
+
+J-Link can also be used to program the board using the JTAG interface exposed in
+the JP2 header.
+
+#. Build the Zephyr kernel and the :ref:`hello_world` sample application:
+
+   .. zephyr-app-commands::
+      :zephyr-app: samples/hello_world
+      :board: gd32e507z_eval
+      :goals: build
+      :compact:
+
+#. Run your favorite terminal program to listen for output. On Linux the
+   terminal should be something like ``/dev/ttyUSB0``. For example:
+
+   .. code-block:: console
+
+      minicom -D /dev/ttyUSB0 -o
+
+   The -o option tells minicom not to send the modem initialization
+   string. Connection should be configured as follows:
+
+      - Speed: 115200
+      - Data: 8 bits
+      - Parity: None
+      - Stop bits: 1
+
+#. To flash an image:
+
+   .. zephyr-app-commands::
+      :zephyr-app: samples/hello_world
+      :board: gd32e507z_eval
+      :goals: flash
+      :compact:
+
+   You should see "Hello World! gd32e507z_eval" in your terminal.
+
+#. To debug an image:
+
+   .. zephyr-app-commands::
+      :zephyr-app: samples/hello_world
+      :board: gd32e507z_eval
+      :goals: debug
+      :compact:
+
+.. _GigaDevice Cortex-M33 High Performance SoC Website:
+   https://www.gigadevice.com/products/microcontrollers/gd32/arm-cortex-m33/high-performance-line/
+
+.. _GD32E507X Datasheet:
+   https://gd32mcu.com/download/down/document_id/252/path_type/1
+
+.. _GD32E50X User Manual:
+   https://www.gd32mcu.com/download/down/document_id/249/path_type/1
+
+.. _GD32E507Z-EVAL User Manual:
+   https://www.gd32mcu.com/data/documents/evaluationBoard/GD32E50x_Demo_Suites_V1.2.1.rar

boards/arm/gd32e507z_eval/gd32e507z_eval-pinctrl.dtsi

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+/*
+ * Copyright (c) 2022, Teslabs Engineering S.L.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <dt-bindings/pinctrl/gd32e507z(e-c)xx-pinctrl.h>
+
+&pinctrl {
+	usart0_default: usart0_default {
+		group1 {
+			pinmux = <USART0_TX_PA9_NORMP>, <USART0_RX_PA10_NORMP>;
+		};
+	};
+
+	pwm0_default: pwm0_default {
+		group1 {
+			pinmux = <TIMER0_CH0_PA8_OUT_NORMP>;
+		};
+	};
+};

boards/arm/gd32e507z_eval/gd32e507z_eval.dts

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+/*
+ * Copyright (c) 2022, Teslabs Engineering S.L.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+
+#include <arm/gigadevice/gd32e50x/gd32e507xe.dtsi>
+#include "gd32e507z_eval-pinctrl.dtsi"
+
+/ {
+	model = "GigaDevice GD32E507Z-EVAL";
+	compatible = "gd,gd32e507z-eval";
+
+	chosen {
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+		zephyr,console = &usart0;
+		zephyr,shell-uart = &usart0;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		led1: led1 {
+			gpios = <&gpiog 10 GPIO_ACTIVE_HIGH>;
+		};
+		led2: led2 {
+			gpios = <&gpiog 11 GPIO_ACTIVE_HIGH>;
+		};
+		led3: led3 {
+			gpios = <&gpiog 12 GPIO_ACTIVE_HIGH>;
+		};
+		led4: led4 {
+			gpios = <&gpiog 13 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
+	gpio_keys {
+		compatible = "gpio-keys";
+		key_a: key_a {
+			label = "KEY_A";
+			gpios = <&gpioa 0 GPIO_ACTIVE_LOW>;
+		};
+		key_b: key_b {
+			label = "KEY_B";
+			gpios = <&gpioc 13 GPIO_ACTIVE_LOW>;
+		};
+		key_c: key_c {
+			label = "KEY_C";
+			gpios = <&gpiof 13 GPIO_ACTIVE_LOW>;
+		};
+		key_d: key_d {
+			label = "KEY_D";
+			gpios = <&gpiof 14 GPIO_ACTIVE_LOW>;
+		};
+		key_cet: key_cet {
+			label = "KEY_CET";
+			gpios = <&gpiof 15 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	pwmleds {
+		compatible = "pwm-leds";
+
+		/* NOTE: bridge TIMER0_CH0 (PA8) and LED1 (PG10)*/
+		pwm_led: pwm_led {
+			pwms = <&pwm0 0 PWM_MSEC(20) PWM_POLARITY_NORMAL>;
+		};
+	};
+
+	aliases {
+		led0 = &led1;
+		sw0 = &key_a;
+		pwm-led0 = &pwm_led;
+	};
+};
+
+&gpioa {
+	status = "okay";
+};
+
+&gpioc {
+	status = "okay";
+};
+
+&gpiof {
+	status = "okay";
+};
+
+&gpiog {
+	status = "okay";
+};
+
+&usart0 {
+	status = "okay";
+	current-speed = <115200>;
+	pinctrl-0 = <&usart0_default>;
+	pinctrl-names = "default";
+};
+
+&timer0 {
+	status = "okay";
+	prescaler = <256>;
+
+	pwm0: pwm {
+		status = "okay";
+		pinctrl-0 = <&pwm0_default>;
+		pinctrl-names = "default";
+	};
+};

boards/arm/gd32e507z_eval/gd32e507z_eval.yaml

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+# Copyright (c) 2022, Teslabs Engineering S.L.
+# SPDX-License-Identifier: Apache-2.0
+
+identifier: gd32e507z_eval
+name: GigaDevice GD32E507Z-EVAL
+type: mcu
+arch: arm
+ram: 128
+flash: 512
+toolchain:
+  - zephyr
+  - gnuarmemb
+  - xtools
+supported:
+  - pwm
+  - gpio

boards/arm/gd32e507z_eval/gd32e507z_eval_defconfig

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+# Copyright (c) 2022, Teslabs Engineering S.L.
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_SOC_SERIES_GD32E50X=y
+CONFIG_SOC_GD32E507=y
+CONFIG_BOARD_GD32E507Z_EVAL=y
+
+CONFIG_ARM_MPU=y
+CONFIG_HW_STACK_PROTECTION=y
+CONFIG_CORTEX_M_SYSTICK=y
+
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+CONFIG_SERIAL=y
+
+CONFIG_GPIO=y