boards: Add Silabs EFR32MG-SLTB004A (Thunderboard Sense 2) support

The EFR32™ Mighty Gecko Starter Kit EFR32MG-SLTB004A (a.k.a
Thunderboard Sense 2) contains a MCU from the EFR32MG12P family built
on ARM® Cortex®-M4F processor with low power capabilities.

There is an On-Board J-Link Debugger that presents a virtual COM port
for general purpose application serial data transfer with this
interface and a Mass Storage for firmware flashing.

Signed-off-by: Diego Sueiro <diego.sueiro@gmail.com>

boards/arm/efr32mg_sltb004a/Kconfig

@@ -0,0 +1,18 @@
+# Kconfig - EFR32MG SLTB004A board configuration
+#
+# Copyright (c) 2018 Christian Taedcke, Diego Sueiro
+#
+# SPDX-License-Identifier: Apache-2.0
+
+if BOARD_EFR32MG_SLTB004A
+
+config BOARD_INIT_PRIORITY
+	int
+
+	# omit prompt to signify a "hidden" option
+	default KERNEL_INIT_PRIORITY_DEFAULT
+	help
+	  Board initialization priority. This must be bigger than
+	  GPIO_GECKO_COMMON_INIT_PRIORITY.
+
+endif # BOARD_EFR32MG_SLTB004A

boards/arm/efr32mg_sltb004a/Kconfig.board

@@ -0,0 +1,12 @@
+# Kconfig - EFR32MG SLTB004A board
+#
+# Copyright (c) 2018, Diego Sueiro
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+config BOARD_EFR32MG_SLTB004A
+	bool "SiLabs EFR32MG-SLTB004A (Thunderboard Sense 2)"
+	depends on SOC_SERIES_EFR32MG12P
+	select SOC_PART_NUMBER_EFR32MG12P332F1024GL125
+	select HAS_DTS_I2C

boards/arm/efr32mg_sltb004a/Kconfig.defconfig

@@ -0,0 +1,56 @@
+# Kconfig - EFR32MG SLTB004A board
+#
+# Copyright (c) 2018, Diego Sueiro
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+if BOARD_EFR32MG_SLTB004A
+
+config BOARD
+	default "efr32mg_sltb004a"
+
+config CMU_HFXO_FREQ
+	default 40000000
+
+config CMU_LFXO_FREQ
+	default 32768
+
+if GPIO_GECKO
+
+config GPIO_GECKO_PORTA
+	def_bool y
+
+config GPIO_GECKO_PORTD
+	def_bool y
+
+config GPIO_GECKO_PORTF
+	def_bool y
+
+endif # GPIO_GECKO
+
+if UART_GECKO
+
+config USART_GECKO_0
+	def_bool y
+
+endif # UART_GECKO
+
+if LEUART_GECKO
+
+config LEUART_GECKO_0
+	def_bool y
+
+endif # LEUART_GECKO
+
+if I2C_GECKO
+
+config I2C_0
+	def_bool y
+
+config I2C_1
+	def_bool y
+
+endif # I2C_GECKO
+
+endif # BOARD_EFR32MG_SLTB004A

boards/arm/efr32mg_sltb004a/board.h

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2018 Christian Taedcke, Diego Sueiro
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef __INC_BOARD_H
+#define __INC_BOARD_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef _ASMLANGUAGE
+
+#include <soc.h>
+
+#endif /* !_ASMLANGUAGE */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __INC_BOARD_H */

boards/arm/efr32mg_sltb004a/doc/efr32mg_sltb004a.rst

@@ -0,0 +1,201 @@
+.. _efr32mg_sltb004a:
+
+EFR32MG-SLTB004A
+################
+
+Overview
+********
+
+The EFR32™ Mighty Gecko Starter Kit EFR32MG-SLTB004A (a.k.a Thunderboard
+Sense 2) contains a MCU from the EFR32MG family built on ARM® Cortex®-M4F
+processor with low power capabilities.
+
+.. image:: efr32mg_sltb004a.jpg
+   :width: 640px
+   :align: center
+   :alt: EFR32MG-SLTB004A
+
+Hardware
+********
+
+- EFR32MG12 Mighty Gecko Wireless SoC with 38.4 MHz operating frequency
+- ARM® Cortex® M4 core with 256 kB RAM and 1024 kB Flash
+- Macronix ultra low power 8-Mbit SPI flash (MX25R8035F)
+- 2.4 GHz ceramic antenna for wireless transmission
+- Silicon Labs Si7021 relative humidity and temperature sensor
+- Silicon Labs Si1133 UV index and ambient light sensor
+- Silicon Labs Si7210 hall effect sensor
+- Bosch Sensortec BMP280 barometric pressure sensor
+- ams CCS811 indoor air quality gas sensor
+- TDK InvenSense ICM-20648 6-axis inertial sensor
+- TDK InvenSense ICS-43434 MEMS microphone
+- Four high brightness RGB LEDs from Broadcom Limited (ASMT-YTB7-0AA02)
+- One bi-color LED and two push buttons
+- Power enable signals for fine grained power-control
+- On-board SEGGER J-Link debugger for easy programming and debugging, which
+  includes a USB virtual COM port
+- Mini Simplicity connector for access to energy profiling and advanced wireless
+  network debugging
+- Breakout pads for GPIO access and connection to external hardware
+- Reset button
+- Automatic switchover between USB and battery power
+- CR2032 coin cell holder and external battery connector
+
+For more information about the EFR32MG SoC and Thunderboard Sense 2
+(EFR32MG-SLTB004A) board:
+
+- `EFR32MG Website`_
+- `EFR32MG Datasheet`_
+- `EFR32MG Reference Manual`_
+- `EFR32MG-SLTB004A Website`_
+- `EFR32MG-SLTB004A User Guide`_
+- `EFR32MG-SLTB004A Schematics`_
+
+Supported Features
+==================
+
+The efr32mg_sltb004a board configuration supports the following hardware features:
+
++-----------+------------+-------------------------------------+
+| Interface | Controller | Driver/Component                    |
++===========+============+=====================================+
+| NVIC      | on-chip    | nested vector interrupt controller  |
++-----------+------------+-------------------------------------+
+| SYSTICK   | on-chip    | systick                             |
++-----------+------------+-------------------------------------+
+| GPIO      | on-chip    | gpio                                |
++-----------+------------+-------------------------------------+
+| UART      | on-chip    | serial port-polling;                |
+|           |            | serial port-interrupt               |
++-----------+------------+-------------------------------------+
+| I2C       | on-chip    | i2c port-polling                    |
++-----------+------------+-------------------------------------+
+
+The default configuration can be found in the defconfig file:
+``boards/arm/efr32mg_sltb004a/efr32mg_sltb004a_defconfig``.
+
+Other hardware features are currently not supported by the port.
+
+Connections and IOs
+===================
+
+The EFR32MG SoC has eight gpio controllers (PORTA, PORTB, PORTC, PORTD,
+PORTF, PORTI, PORTJ and PORTK).
+
+In the following table, the column Name contains Pin names. For example, PE2
+means Pin number 2 on PORTE and #27 represents the location bitfield , as used
+in the board's and microcontroller's datasheets and manuals.
+
++------+-------------+-----------------------------------+
+| Name | Function    | Usage                             |
++======+=============+===================================+
+| PD8  | GPIO        | LED0 (RED)                        |
++------+-------------+-----------------------------------+
+| PD9  | GPIO        | LED1 (GREEN)                      |
++------+-------------+-----------------------------------+
+| PD14 | GPIO        | SW0 Push Button PB0               |
++------+-------------+-----------------------------------+
+| PD15 | GPIO        | Push Button PB1                   |
++------+-------------+-----------------------------------+
+| PA0  | UART_TX     | UART TX Console VCOM_TX US0_TX #0 |
++------+-------------+-----------------------------------+
+| PA1  | UART_RX     | UART RX Console VCOM_RX US0_RX #0 |
++------+-------------+-----------------------------------+
+| PF3  | UART_TX     | EXP12_UART_TX LEU0_TX #27         |
++------+-------------+-----------------------------------+
+| PF4  | UART_RX     | EXP14_UART_RX LEU0_RX #27         |
++------+-------------+-----------------------------------+
+| PC10 | I2C_SDA     | EXP16_I2C_SDA I2C0_SDA #15        |
++------+-------------+-----------------------------------+
+| PC11 | I2C_SCL     | EXP15_I2C_SCL I2C0_SCL #15        |
++------+-------------+-----------------------------------+
+| PC4  | I2C_SDA     | ENV_I2C_SDA I2C1_SDA #17          |
++------+-------------+-----------------------------------+
+| PC5  | I2C_SCL     | ENV_I2C_SCL I2C1_SCL #17          |
++------+-------------+-----------------------------------+
+
+System Clock
+============
+
+The EFR32MG SoC is configured to use the 38.4 MHz external oscillator on the
+board.
+
+Serial Port
+===========
+
+The EFR32MG SoC has four USARTs and one Low Energy UARTs (LEUART with 9600
+maximum baudrate). USART0 is configured as the Zephyr console and is connected
+to the On-Board J-Link Debugger that presents a virtual COM port for general
+purpose application serial data transfer with this interface.
+
+Programming and Debugging
+*************************
+
+.. note::
+   Before using the kit the first time, you should update the J-Link firmware
+   from `J-Link-Downloads`_
+
+Flashing
+========
+
+The EFR32MG-SLTB004A includes an `J-Link`_ serial and debug adaptor built into the
+board. The adaptor provides:
+
+- A USB connection to the host computer, which exposes a Mass Storage and a
+  USB Serial Port.
+- A Serial Flash device, which implements the USB flash disk file storage.
+- A physical UART connection which is relayed over interface USB Serial port.
+
+Flashing an application to EFR32-SLTB004A
+-----------------------------------------
+
+The sample application :ref:`hello_world` is used for this example.
+Build the Zephyr kernel and application:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/hello_world
+   :board: efr32mg_sltb004a
+   :goals: build
+
+Connect the EFR32MG-SLTB004A to your host computer using the USB port and you
+should see a USB connection which exposes a Mass Storage (TB004) and a
+USB Serial Port. Copy the generated zephyr.bin in the SLTB004A drive.
+
+Open a serial terminal (minicom, putty, etc.) with the following settings:
+
+- Speed: 115200
+- Data: 8 bits
+- Parity: None
+- Stop bits: 1
+
+Reset the board and you should be able to see on the corresponding Serial Port
+the following message:
+
+.. code-block:: console
+
+   Hello World! arm
+
+
+.. _EFR32MG-SLTB004A Website:
+   https://www.silabs.com/products/development-tools/thunderboard/thunderboard-sense-two-kit
+
+.. _EFR32MG-SLTB004A User Guide:
+   https://www.silabs.com/documents/public/user-guides/ug309-sltb004a-user-guide.pdf
+
+.. _EFR32MG-SLTB004A Schematics:
+   https://www.silabs.com/documents/public/schematic-files/TBSense2-BRD4166A-D00-schematic.pdf
+
+.. _EFR32MG Website:
+   https://www.silabs.com/products/wireless/mesh-networking/efr32mg-mighty-gecko-zigbee-thread-soc
+
+.. _EFR32MG Datasheet:
+   https://www.silabs.com/documents/public/data-sheets/efr32mg12-datasheet.pdf
+
+.. _EFR32MG Reference Manual:
+   https://www.silabs.com/documents/public/reference-manuals/efr32xg12-rm.pdf
+
+.. _J-Link:
+   https://www.segger.com/jlink-debug-probes.html
+
+.. _J-Link-Downloads:
+   https://www.segger.com/downloads/jlink

boards/arm/efr32mg_sltb004a/efr32mg_sltb004a.dts

@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2018 Diego Sueiro
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+#include <silabs/efr32mg12p332f1024gl125.dtsi>
+
+/ {
+	model = "Silabs EFR32MG SLTB004A board (aka Thunderboard Sense 2)";
+	compatible = "silabs,efr32mg_sltb004a", "silabs,efr32mg";
+
+	aliases {
+		i2c-0  = &i2c0;
+		i2c-1  = &i2c1;
+		usart-0 = &usart0;
+		leuart-0 = &leuart0;
+		led0 = &led0;
+		led1 = &led1;
+		sw0 = &button0;
+		sw1 = &button1;
+	};
+
+	chosen {
+		zephyr,console = &usart0;
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		led0: led_0 {
+			gpios = <&gpiod 8 0>;
+			label = "LED 0";
+		};
+		led1: led_1 {
+			gpios = <&gpiod 9 0>;
+			label = "LED 1";
+		};
+	};
+
+	buttons {
+		compatible = "gpio-keys";
+		button0: button_0 {
+			/* gpio flags need validation */
+			gpios = <&gpiod 14 GPIO_INT_ACTIVE_LOW>;
+			label = "User Push Button 0";
+		};
+		button1: button_1 {
+			/* gpio flags need validation */
+			gpios = <&gpiod 15 GPIO_INT_ACTIVE_LOW>;
+			label = "User Push Button 1";
+		};
+	};
+};
+
+&usart0 {
+	current-speed = <115200>;
+	location = <0>;
+	status = "ok";
+};
+
+&leuart0 {
+	current-speed = <9600>;
+	location = <27>;
+	status = "ok";
+};
+
+&i2c0 {
+	location = <15>;
+	status = "ok";
+};
+
+&i2c1 {
+	location = <17>;
+	status = "ok";
+};