boards: Add support for PG23/PG28 Pro Kit

boards/silabs/dev_kits/pg23_pk2504a/Kconfig.defconfig

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+# Copyright (c) 2025 Christoph Jans
+# SPDX-License-Identifier: Apache-2.0
+
+if BOARD_PG23_PK2504A
+
+config LOG_BACKEND_SWO_FREQ_HZ
+	default 875000
+	depends on LOG_BACKEND_SWO
+
+endif

boards/silabs/dev_kits/pg23_pk2504a/Kconfig.pg23_pk2504a

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+# Copyright (c) 2025 Christoph Jans
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_PG23_PK2504A
+	select SOC_EFM32PG23B310F512IM48

boards/silabs/dev_kits/pg23_pk2504a/board.cmake

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+# SPDX-License-Identifier: Apache-2.0
+
+board_runner_args(jlink "--device=EFM32PG23BxxxF512")
+include(${ZEPHYR_BASE}/boards/common/jlink.board.cmake)
+
+board_runner_args(openocd)
+include(${ZEPHYR_BASE}/boards/common/openocd.board.cmake)
+
+board_runner_args(silabs_commander "--device=EFM32PG23BxxxF512")
+include(${ZEPHYR_BASE}/boards/common/silabs_commander.board.cmake)

boards/silabs/dev_kits/pg23_pk2504a/board.yml

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+board:
+  name: pg23_pk2504a
+  full_name: EFM32PG23 Pro Kit (PG23-PK2504A)
+  vendor: silabs
+  socs:
+    - name: efm32pg23b310f512im48

boards/silabs/dev_kits/pg23_pk2504a/doc/index.rst

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+.. zephyr:board:: pg23_pk2504a
+
+Overview
+********
+
+The EFM32PG23 Pearl Gecko Board dev kit contains
+a System-On-Chip from the EFM32PG23 family built on an
+ARM Cortex®-M33 processor with excellent low power capabilities.
+
+Hardware
+********
+
+- EFM32PG23B310F512IM48 Pearl Gecko SoC
+- CPU core: ARM Cortex®-M33
+- Flash memory: 512 kB
+- RAM: 64 kB
+- Key features:
+  - USB connectivity
+  - Advanced Energy Monitor (AEM)
+  - SEGGER J-Link on-board debugger
+  - Debug multiplexer supporting external hardware as well as on-board MCU
+  - 4x10 segment LCD
+  - User LEDs and push buttons
+  - Silicon Labs' Si7021 Relative Humidity and Temperature Sensor
+  - SMA connector for IADC demonstration
+  - Inductive LC sensor
+  - 20-pin 2.54 mm header for expansion boards
+  - Breakout pads for direct access to I/O pins
+  - Power sources include USB and CR2032 coin cell battery
+
+For more information about the EFM32PG23 SoC and BRD2504A board, refer to these
+documents:
+
+- `EFM32PG23 Website`_
+- `EFM32PG23 Datasheet`_
+- `EFM32PG23 Reference Manual`_
+- `BRD2504A User Guide`_
+
+Supported Features
+==================
+
+.. zephyr:board-supported-hw::
+
+Connections and IOs
+===================
+
+In the following table, the column **Name** contains Pin names. For example, PA2
+means Pin number 2 on Port A, as used in the board's datasheets and manuals.
+
++------+-----------------+---------------------+
+| Name | Function        | Usage               |
++======+=================+=====================+
+| PA5  | GPIO            | Push Button 0       |
++------+-----------------+---------------------+
+| PA7  | I2C0_SDA        | Si7021 I2C Data     |
++------+-----------------+---------------------+
+| PA8  | I2C0_SCL        | Si7021 I2C Clock    |
++------+-----------------+---------------------+
+| PB4  | GPIO            | Push Button 1       |
++------+-----------------+---------------------+
+| PB5  | EUSART0_TX      | Console Tx          |
++------+-----------------+---------------------+
+| PB6  | EUSART0_RX      | Console Rx          |
++------+-----------------+---------------------+
+| PC8  | GPIO/TIMER0_CC0 | LED0                |
++------+-----------------+---------------------+
+| PC9  | GPIO/TIMER0_CC1 | LED1                |
++------+-----------------+---------------------+
+
+The default configuration can be found in
+:zephyr_file:`boards/silabs/dev_kits/pg23_pk2504a/pg23_pk2504a_defconfig`
+
+System Clock
+============
+
+The EFM32PG23 SoC is configured to use the 39 MHz external oscillator on the
+board.
+
+Serial Port
+===========
+
+The EFM32PG23 SoC has one USART and three EUSARTs.
+EUSART0 is connected to the board controller and is used for the console.
+
+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.
+
+Flashing
+========
+
+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: pg23_pk2504a
+   :goals: build
+
+Connect the pg23_pk2504a to your host computer using the USB port and you
+should see a USB connection.
+
+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'll see the following message on the corresponding serial port
+terminal session:
+
+.. code-block:: console
+
+   Hello World! pg23_pk2504a
+
+Troubleshooting
+===============
+If no serial output occurs, use SEGGERs RTT Viewer and update :zephyr_file:`boards/silabs/dev_kits/pg23_pk2504a/pg23_pk2504a_defconfig` with
+
+.. code-block:: console
+
+   CONFIG_UART_CONSOLE=n
+   CONFIG_RTT_CONSOLE=y
+   CONFIG_USE_SEGGER_RTT=y
+
+.. _EFM32PG23 Website:
+   https://www.silabs.com/mcu/32-bit-microcontrollers/efm32pg23-series-2#
+
+.. _EFM32PG23 Datasheet:
+   https://www.silabs.com/documents/public/data-sheets/efm32pg23-datasheet.pdf
+
+.. _EFM32PG23 Reference Manual:
+   https://www.silabs.com/documents/public/reference-manuals/efm32pg23-rm.pdf
+
+.. _BRD2504A User Guide:
+   https://www.silabs.com/documents/public/user-guides/ug515-efm32pg23-brd2504a-user-guide.pdf

boards/silabs/dev_kits/pg23_pk2504a/pg23_pk2504a-pinctrl.dtsi

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+/*
+ * Copyright (c) 2025 Christoph Jans
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/pinctrl/silabs/xg23-pinctrl.h>
+
+&pinctrl {
+	eusart0_default: eusart0_default {
+		group0 {
+			pins = <EUSART0_TX_PB5>;
+			drive-push-pull;
+			output-high;
+		};
+
+		group1 {
+			pins = <EUSART0_RX_PB6>;
+			input-enable;
+			silabs,input-filter;
+		};
+	};
+
+	i2c0_default: i2c0_default {
+		group0 {
+			pins = <I2C0_SCL_PA8>, <I2C0_SDA_PA7>;
+			drive-open-drain;
+			bias-pull-up;
+		};
+	};
+
+	timer0_default: timer0_default {
+		group0 {
+			pins = <TIMER0_CC0_PC8>, <TIMER0_CC1_PC9>;
+			drive-push-pull;
+			output-high;
+		};
+	};
+};