boards: silabs: Support for efm32tg_stk3300

boards/silabs/starter_kits/efm32tg_stk3300/Kconfig.defconfig

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+# Copyright (c) 2025, Lukas Woodtli
+# SPDX-License-Identifier: Apache-2.0
+
+if BOARD_EFM32TG_STK3300
+
+config CMU_HFXO_FREQ
+	default 32000000
+
+config CMU_LFXO_FREQ
+	default 32768
+
+endif # BOARD_EFM32TG_STK3300

boards/silabs/starter_kits/efm32tg_stk3300/Kconfig.efm32tg_stk3300

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+# Copyright (c) 2025, Lukas Woodtli
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_EFM32TG_STK3300
+	select SOC_PART_NUMBER_EFM32TG840F32

boards/silabs/starter_kits/efm32tg_stk3300/board.cmake

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+# Copyright (c) 2025, Lukas Woodtli
+# SPDX-License-Identifier: Apache-2.0
+
+board_runner_args(jlink "--device=EFM32TG840F32")
+include(${ZEPHYR_BASE}/boards/common/jlink.board.cmake)

boards/silabs/starter_kits/efm32tg_stk3300/board.yml

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+board:
+  name: efm32tg_stk3300
+  full_name: EFM32 Tiny Gecko (EFM32TG-STK3300)
+  vendor: silabs
+  socs:
+  - name: efm32tg840f32

boards/silabs/starter_kits/efm32tg_stk3300/doc/index.rst

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+.. zephyr:board:: efm32tg_stk3300
+
+Overview
+********
+
+The EFM32 Tiny Gecko Starter Kit EFM32TG-STK3300 contains a MCU from the
+EFM32TG family built on ARM® Cortex®-M3 processor with excellent low
+power capabilities.
+
+Hardware
+********
+
+- EFM32TG840F32 MCU with 32 kB flash and 4 kB RAM
+- Advanced Energy Monitoring provides real-time information about the energy
+  consumption of an application or prototype design.
+- 160 segment Energy Micro LCD
+- 2 user buttons, 1 LED and a touch slider
+- Ambient Light Sensor, Inductive-capacitive metal sensor and touch sensor
+- On-board Segger J-Link USB debugger
+
+For more information about the EFM32TG SoC and EFM32TG-STK3300 board:
+
+- `EFM32TG Website`_
+- `EFM32TG Datasheet`_
+- `EFM32TG Reference Manual`_
+- `EFM32TG-STK3300 Website`_
+- `EFM32TG-STK3300 User Guide`_
+- `EFM32TG-STK3300 Schematics`_
+
+Supported Features
+==================
+
+.. zephyr:board-supported-hw::
+
+Connections and IOs
+===================
+
+The EFM32TG SoC has six gpio controllers (PORTA to PORTF), but only three are
+currently enabled (PORTB, PORTC and PORTD) for the EFM32TG-STK3300 board.
+
+In the following table, the column Name contains Pin names. For example, PE2
+means Pin number 2 on PORTE, as used in the board's datasheets and manuals.
+
++------+-----------+---------------------------------------+
+| Name | Function  | Usage                                 |
++======+===========+=======================================+
+| PD7  | GPIO      | LED0                                  |
++------+-----------+---------------------------------------+
+| PD8  | GPIO      | Push Button PB0                       |
++------+-----------+---------------------------------------+
+| PB11 | GPIO      | Push Button PB1                       |
++------+-----------+---------------------------------------+
+| PD0  | USART1_TX | UART Console USART1_TX #1 (EXP Pin 4) |
++------+-----------+---------------------------------------+
+| PD1  | USART1_RX | UART Console USART1_RX #1 (EXP Pin 6) |
++------+-----------+---------------------------------------+
+
+System Clock
+============
+
+The EFM32TG SoC is configured to use the 32 MHz external oscillator on the
+board.
+
+Serial Port
+===========
+
+The EFM32TG SoC has two USARTs and two Low Energy UARTs (LEUART).
+USART1 is used for the console. It is exposed to the EXP Header on the
+board (TX: Pin 4, RX: Pin 6).
+
+Programming and Debugging
+*************************
+
+.. zephyr:board-supported-runners::
+
+.. note::
+   Before using the kit the first time, you should update the J-Link firmware
+   in Simplicity Studio or with *JLinkConfig*.
+
+Flashing
+========
+
+The EFM32TG-STK3300 includes an `J-Link`_ debug adaptor built into the
+board. It is used to flash and debug the EFM32TG on the board.
+
+Flashing an application to EFM32-STK3300
+----------------------------------------
+
+The sample application :zephyr:code-sample:`hello_world` is used for this example.
+Build the Zephyr kernel and application:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/hello_world
+   :board: efm32tg_stk3300
+   :goals: build
+
+Connect the EFM32TG-STK3300 to your host computer using the USB port.
+Flash the device:
+
+.. code-block:: console
+
+   west flash
+
+Connect the board with
+Use a Serial-to-USB cable to connect the host computer with the board.
+The serial port is exposed on the EXP Header (TX: Pin 4, RX: Pin 6).
+
+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! efm32tg_stk3300/efm32tg840f32
+
+
+.. _EFM32TG-STK3300 Website:
+   https://www.silabs.com/products/development-tools/mcu/32-bit/efm32-tiny-gecko-starter-kit
+
+.. _EFM32TG-STK3300 User Guide:
+   https://www.silabs.com/documents/public/user-guides/ug420-efm32tg-stk3300.pdf
+
+.. _EFM32TG-STK3300 Schematics:
+   https://www.silabs.com/documents/public/schematic-files/BRD2100A-A04-schematic.pdf
+
+.. _EFM32TG Website:
+   https://www.silabs.com/products/mcu/32-bit/efm32-tiny-gecko
+
+.. _EFM32TG Datasheet:
+   https://www.silabs.com/documents/public/data-sheets/EFM32TG840.pdf
+
+.. _EFM32TG Reference Manual:
+   https://www.silabs.com/documents/public/reference-manuals/EFM32TG-RM.pdf
+
+.. _J-Link:
+   https://www.segger.com/jlink-debug-probes.html

boards/silabs/starter_kits/efm32tg_stk3300/efm32tg_stk3300.dts

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+/*
+ * Copyright (c) 2025 Lukas Woodtli
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+#include <silabs/efm32tg840f32.dtsi>
+#include <zephyr/dt-bindings/input/input-event-codes.h>
+
+/ {
+	model = "Silicon Labs EFM32TG STK3300 board";
+	compatible = "silabs,efm32tg_stk3300", "silabs,efm32tg";
+
+	chosen {
+		zephyr,console = &usart1;
+		zephyr,flash = &flash0;
+		zephyr,shell-uart = &usart1;
+		zephyr,sram = &sram0;
+	};
+
+	/* These aliases are provided for compatibility with samples */
+	aliases {
+		led0 = &led0;
+		sw0 = &button0;
+		sw1 = &button1;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led0: led_0 {
+			gpios = <&gpiod 7 0>;
+			label = "LED 0";
+		};
+	};
+
+	buttons {
+		compatible = "gpio-keys";
+
+		button0: button_0 {
+			/* gpio flags need validation */
+			gpios = <&gpiod 8 GPIO_ACTIVE_LOW>;
+			label = "User Push Button 0";
+			zephyr,code = <INPUT_KEY_0>;
+		};
+
+		button1: button_1 {
+			/* gpio flags need validation */
+			gpios = <&gpiob 11 GPIO_ACTIVE_LOW>;
+			label = "User Push Button 1";
+			zephyr,code = <INPUT_KEY_1>;
+		};
+	};
+};
+
+&cpu0 {
+	clock-frequency = <32000000>;
+};
+
+&gpiob {
+	status = "okay";
+};
+
+&gpioc {
+	status = "okay";
+};
+
+&gpiod {
+	status = "okay";
+};
+
+&usart1 {
+	current-speed = <115200>;
+	location-tx = <GECKO_LOCATION(1) GECKO_PORT_D GECKO_PIN(0)>;
+	location-rx = <GECKO_LOCATION(1) GECKO_PORT_D GECKO_PIN(1)>;
+	status = "okay";
+};

boards/silabs/starter_kits/efm32tg_stk3300/efm32tg_stk3300.yaml

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+identifier: efm32tg_stk3300
+name: EFM32 Wonder Gecko Starter Kit (EFM32TG-STK3300, BRD2100)
+type: mcu
+arch: arm
+ram: 4
+flash: 32
+toolchain:
+  - zephyr
+  - gnuarmemb
+supported:
+  - gpio
+  - nvs
+testing:
+  ignore_tags:
+    - net
+    - bluetooth
+vendor: silabs

boards/silabs/starter_kits/efm32tg_stk3300/efm32tg_stk3300_defconfig

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+# Copyright (c) 2025, Lukas Woodtli
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_ARM_MPU=n
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+CONFIG_SERIAL=y
+CONFIG_GPIO=y
+CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=32000000
+CONFIG_CMU_HFCLK_HFXO=y