boards: m5stack_atoms3_lite: add support for M5Stack AtomS3 Lite

Add support for M5Stack AtomS3 Lite development board.

The AtomS3 Lite is a smaller version of the AtomS3 that
features only a StatusLED and no LCD display.

Signed-off-by: Martin Kiepfer <mrmarteng@teleschirm.org>

boards/xtensa/m5stack_atoms3_lite/Kconfig.board

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+# M5Stack AtomS3 Lite board configuration
+# Copyright (c) 2023 Martin Kiepfer <mrmarteng@teleschirm.org>
+# SPDX-License-Identifier: Apache-2.0
+
+# M5Stack AtomS3 Lite
+config BOARD_M5STACK_ATOMS3_LITE
+	bool "M5Stack AtomS3 Lite Development Board"
+	depends on SOC_SERIES_ESP32S3
+
+choice SOC_PART_NUMBER
+	default SOC_ESP32S3_FN8
+endchoice

boards/xtensa/m5stack_atoms3_lite/Kconfig.defconfig

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+# M5Stack AtomS3 Lite board configuration
+# Copyright (c) 2023 Martin Kiepfer <mrmarteng@teleschirm.org>
+# SPDX-License-Identifier: Apache-2.0
+
+if BOARD_M5STACK_ATOMS3_LITE
+
+config BOARD
+	default "m5stack_atoms3_lite"
+	depends on BOARD_M5STACK_ATOMS3_LITE
+
+config ENTROPY_GENERATOR
+	default y
+
+config HEAP_MEM_POOL_ADD_SIZE_BOARD
+	int
+	default 98304 if WIFI
+	default 65536 if BT
+	default 4096
+
+config KERNEL_MEM_POOL
+	default y
+
+choice BT_HCI_BUS_TYPE
+	default BT_ESP32 if BT
+endchoice
+endif # BOARD_M5STACK_ATOMS3_LITE

boards/xtensa/m5stack_atoms3_lite/Kconfig.sysbuild

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+# Copyright (c) 2023 Espressif Systems (Shanghai) Co., Ltd.
+# SPDX-License-Identifier: Apache-2.0
+
+choice BOOTLOADER
+	default BOOTLOADER_MCUBOOT
+endchoice
+
+choice BOOT_SIGNATURE_TYPE
+	default BOOT_SIGNATURE_TYPE_NONE
+endchoice

boards/xtensa/m5stack_atoms3_lite/board.cmake

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+# SPDX-License-Identifier: Apache-2.0
+
+if(NOT "${OPENOCD}" MATCHES "^${ESPRESSIF_TOOLCHAIN_PATH}/.*")
+  set(OPENOCD OPENOCD-NOTFOUND)
+endif()
+find_program(OPENOCD openocd PATHS ${ESPRESSIF_TOOLCHAIN_PATH}/openocd-esp32/bin NO_DEFAULT_PATH)
+
+include(${ZEPHYR_BASE}/boards/common/esp32.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/openocd.board.cmake)

boards/xtensa/m5stack_atoms3_lite/doc/index.rst

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+.. _m5stack_atoms3_lite:
+
+M5Stack AtomS3 Lite
+###################
+
+Overview
+********
+
+M5Stack AtomS3 Lite is an ESP32-based development board from M5Stack.
+
+It features the following integrated components:
+
+- ESP32-S3FN8 chip (240MHz dual core, Wi-Fi/BLE 5.0)
+- 512KB of SRAM
+- 384KB of ROM
+- 8MB of Flash
+- RGB Status-LED
+
+
+.. figure:: img/m5stack_atoms3_lite.webp
+        :align: center
+        :alt: M5Stack AtomS3 Lite
+
+        M5Stack AtomS3 Lite
+
+
+Supported Features
+==================
+
+The Zephyr m5stack_atoms3_lite board configuration supports the following hardware features:
+
++-----------+------------+-------------------------------------+
+| Interface | Controller | Driver/Component                    |
++===========+============+=====================================+
+| NVIC      | on-chip    | nested vector interrupt controller  |
++-----------+------------+-------------------------------------+
+| UART      | on-chip    | serial port-polling;                |
+|           |            | serial port-interrupt               |
++-----------+------------+-------------------------------------+
+| PINMUX    | on-chip    | pinmux                              |
++-----------+------------+-------------------------------------+
+| GPIO      | on-chip    | gpio                                |
++-----------+------------+-------------------------------------+
+| I2C       | on-chip    | i2c                                 |
++-----------+------------+-------------------------------------+
+| SPI       | on-chip    | spi                                 |
++-----------+------------+-------------------------------------+
+| CLOCK     | on-chip    | reset and clock control             |
++-----------+------------+-------------------------------------+
+| COUNTER   | on-chip    | rtc                                 |
++-----------+------------+-------------------------------------+
+| WATCHDOG  | on-chip    | independent watchdog                |
++-----------+------------+-------------------------------------+
+| PWM       | on-chip    | pwm                                 |
++-----------+------------+-------------------------------------+
+| ADC       | on-chip    | adc                                 |
++-----------+------------+-------------------------------------+
+| DAC       | on-chip    | dac                                 |
++-----------+------------+-------------------------------------+
+| die-temp  | on-chip    | die temperature sensor              |
++-----------+------------+-------------------------------------+
+
+
+Start Application Development
+*****************************
+
+Before powering up your M5Stack AtomS3 Lite, please make sure that the board is in good
+condition with no obvious signs of damage.
+
+System requirements
+===================
+
+Prerequisites
+-------------
+
+Espressif HAL requires WiFi and Bluetooth binary blobs in order work. Run the command
+below to retrieve those files.
+
+.. code-block:: shell
+
+   west blobs fetch hal_espressif
+
+.. note::
+
+   It is recommended running the command above after :file:`west update`.
+
+Building & Flashing
+-------------------
+
+Build and flash applications as usual (see :ref:`build_an_application` and
+:ref:`application_run` for more details).
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/hello_world
+   :board: m5stack_atoms3_lite
+   :goals: build
+
+The usual ``flash`` target will work with the ``m5stack_atoms3_lite`` board
+configuration. Here is an example for the :ref:`hello_world`
+application.
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/hello_world
+   :board: m5stack_atoms3_lite
+   :goals: flash
+
+The baud rate of 921600bps is set by default. If experiencing issues when flashing,
+try using different values by using ``--esp-baud-rate <BAUD>`` option during
+``west flash`` (e.g. ``west flash --esp-baud-rate 115200``).
+
+You can also open the serial monitor using the following command:
+
+.. code-block:: shell
+
+   west espressif monitor
+
+After the board has automatically reset and booted, you should see the following
+message in the monitor:
+
+.. code-block:: console
+
+   ***** Booting Zephyr OS vx.x.x-xxx-gxxxxxxxxxxxx *****
+   Hello World! m5stack_atoms3_lite
+
+Debugging
+---------
+
+M5Stack AtomS3 Lite debugging is not supported due to pinout limitations.
+
+Related Documents
+*****************
+
+- `M5Stack AtomS3 Lite schematic <https://static-cdn.m5stack.com/resource/docs/products/core/AtomS3%20Lite/img-4061fdd4-6954-4709-a7e7-b0f50e5ba52e.webp>`_
+- `ESP32S3 Datasheet <https://www.espressif.com/sites/default/files/documentation/esp32-s3_datasheet_en.pdf>`_

boards/xtensa/m5stack_atoms3_lite/grove_connectors.dtsi

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+/*
+ * Copyright (c) 2023 Benjamin Cabé <benjamin@zephyrproject.org>
+ * Copyright (c) 2023 Martin Kiepfer <mrmarteng@teleschirm.org>
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	grove_header: grove_header {
+		compatible = "grove-header";
+		#gpio-cells = <2>;
+		gpio-map-mask = <0xffffffff 0xffffffc0>;
+		gpio-map-pass-thru = <0 0x3f>;
+		gpio-map = <0 0 &gpio0 1 0>,
+			   <1 0 &gpio0 2 0>;
+	};
+};
+
+grove_i2c1: &i2c1 {};

boards/xtensa/m5stack_atoms3_lite/m5stack_atoms3_lite-pinctrl.dtsi

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+/*
+ * Copyright (c) 2023 Benjamin Cabé <benjamin@zephyrproject.org>
+ * Copyright (c) 2023 Martin Kiepfer <mrmarteng@teleschirm.org>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include <zephyr/dt-bindings/pinctrl/esp-pinctrl-common.h>
+#include <dt-bindings/pinctrl/esp32s3-pinctrl.h>
+#include <zephyr/dt-bindings/pinctrl/esp32s3-gpio-sigmap.h>
+
+&pinctrl {
+	uart0_default: uart0_default {
+		 group1 {
+			 pinmux = <UART0_TX_GPIO43>;
+			 output-high;
+		 };
+		 group2 {
+			 pinmux = <UART0_RX_GPIO44>;
+			 bias-pull-up;
+		 };
+	 };
+
+	i2c0_default: i2c0_default {
+		group1 {
+			pinmux = <I2C0_SDA_GPIO38>,
+				 <I2C0_SCL_GPIO39>;
+			bias-pull-up;
+			drive-open-drain;
+			output-high;
+		};
+	};
+
+	i2c1_default: i2c1_default {
+		group1 {
+			pinmux = <I2C1_SDA_GPIO2>,
+				 <I2C1_SCL_GPIO1>;
+			bias-pull-up;
+			drive-open-drain;
+			output-high;
+		};
+	};
+
+	spim3_ws2812_led: spim3_ws2812_led {
+		group1 {
+			pinmux = <SPIM3_MOSI_GPIO35>;
+			output-low;
+		};
+	};
+};

boards/xtensa/m5stack_atoms3_lite/m5stack_atoms3_lite.dts

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+/*
+ * Copyright (c) 2023 Benjamin Cabé <benjamin@zephyrproject.org>
+ * Copyright (c) 2023 Martin Kiepfer <mrmarteng@teleschirm.org>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+/dts-v1/;
+
+#include <espressif/esp32s3/esp32s3_fn8.dtsi>
+#include "m5stack_atoms3_lite-pinctrl.dtsi"
+#include <dt-bindings/led/led.h>
+#include <dt-bindings/led/worldsemi_ws2812c.h>
+#include <zephyr/dt-bindings/input/input-event-codes.h>
+
+/ {
+	model = "M5Stack AtomS3 Lite";
+	compatible = "m5stack,atoms3_lite";
+
+	chosen {
+		zephyr,sram = &sram0;
+		zephyr,console = &usb_serial;
+		zephyr,shell-uart = &usb_serial;
+		zephyr,flash = &flash0;
+		zephyr,code-partition = &slot0_partition;
+	};
+
+	aliases {
+		sw0 = &user_button_0;
+		watchdog0 = &wdt0;
+		i2c-0 = &i2c0;
+		led-strip = &status_rgb_led;
+	};
+
+	buttons {
+		compatible = "gpio-keys";
+		debounce-interval-ms = <100>;
+		user_button_0: button_0 {
+			label = "User button 0";
+			gpios = <&gpio1 9 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
+			zephyr,code = <INPUT_KEY_0>;
+		};
+	};
+};
+
+&cpu0 {
+	clock-frequency = <ESP32_CLK_CPU_240M>;
+};
+
+&cpu1 {
+	clock-frequency = <ESP32_CLK_CPU_240M>;
+};
+
+&usb_serial {
+	status = "okay";
+};
+&uart0 {
+	status = "okay";
+	current-speed = <115200>;
+	pinctrl-0 = <&uart0_default>;
+	pinctrl-names = "default";
+};
+
+&i2c0 {
+	status = "okay";
+	clock-frequency = <I2C_BITRATE_STANDARD>;
+	pinctrl-0 = <&i2c0_default>;
+	pinctrl-names = "default";
+};
+
+&i2c1 {
+	status = "okay";
+	clock-frequency = <I2C_BITRATE_STANDARD>;
+	pinctrl-0 = <&i2c1_default>;
+	pinctrl-names = "default";
+};
+
+&trng0 {
+	status = "okay";
+};
+
+&spi3 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+	line-idle-low;
+	pinctrl-0 = <&spim3_ws2812_led>;
+	pinctrl-names = "default";
+
+	status_rgb_led: ws2812@0 {
+		compatible = "worldsemi,ws2812-spi";
+		reg = <0>;
+		spi-max-frequency = <WS2812C_SPI_FREQ>;
+
+		chain-length = <1>;
+		color-mapping =	<LED_COLOR_ID_GREEN>,
+			<LED_COLOR_ID_RED>,
+			<LED_COLOR_ID_BLUE>;
+		spi-one-frame = <WS2812C_ONE_FRAME>;
+		spi-zero-frame = <WS2812C_ZERO_FRAME>;
+	};
+};
+&gpio0 {
+	status = "okay";
+};
+
+&gpio1 {
+	status = "okay";
+};
+
+&wdt0 {
+	status = "okay";
+};
+
+&timer0 {
+	status = "okay";
+};
+
+&timer1 {
+	status = "okay";
+};
+
+&flash0 {
+	status = "okay";
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		boot_partition: partition@0 {
+			label = "mcuboot";
+			reg = <0x00000000 0x0000F000>;
+			read-only;
+		};
+
+		slot0_partition: partition@10000 {
+			label = "image-0";
+			reg = <0x00010000 0x00100000>;
+		};
+
+		slot1_partition: partition@110000 {
+			label = "image-1";
+			reg = <0x00110000 0x00100000>;
+		};
+
+		scratch_partition: partition@210000 {
+			label = "image-scratch";
+			reg = <0x00210000 0x00040000>;
+		};
+
+		storage_partition: partition@250000 {
+			label = "storage";
+			reg = <0x00250000 0x00006000>;
+		};
+	};
+};

boards/xtensa/m5stack_atoms3_lite/m5stack_atoms3_lite.yaml

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+identifier: m5stack_atoms3_lite
+name: M5Stack AtomS3-Lite
+type: mcu
+arch: xtensa
+toolchain:
+  - zephyr
+supported:
+  - gpio
+  - uart
+  - i2c
+  - spi
+  - counter
+  - watchdog
+  - entropy
+  - pwm
+  - pinmux
+  - nvs
+  - dma
+testing:
+  ignore_tags:
+    - net
+    - bluetooth
+vendor: m5stack

boards/xtensa/m5stack_atoms3_lite/m5stack_atoms3_lite_defconfig

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+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_BOARD_M5STACK_ATOMS3_LITE=y
+CONFIG_SOC_SERIES_ESP32S3=y
+
+CONFIG_MAIN_STACK_SIZE=2048
+
+CONFIG_CONSOLE=y
+CONFIG_SERIAL=y
+CONFIG_UART_CONSOLE=y
+CONFIG_GPIO=y
+CONFIG_CLOCK_CONTROL=y

dts/bindings/gpio/m5stack,atom-header.yaml

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+# Copyright (c) 2023 Martin Kiepfer <mrmarteng@teleschirm.org>
+# SPDX-License-Identifier: Apache-2.0
+
+description: |
+    Pin-header exposed on M5Stack Atom devices.
+
+    This binding provides a nexus mapping for 9 pins as depicted below.
+
+        x  3.3V
+        0  GPIO                 1  SCL
+        2  GPIO/MOSI            3  GPIO/DAC0/SDA
+        4  GPIO/CLK             5  5V
+        6  GPIO/ADC0/MISO       7  GND
+
+compatible: "m5stack,atom-header"
+
+include: [gpio-nexus.yaml, base.yaml]