boards: adafruit: Add Metro rp2350 board

boards/adafruit/metro_rp2350/Kconfig.adafruit_metro_rp2350

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+# Copyright (c) 2025 Pete Johanson
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_ADAFRUIT_METRO_RP2350
+	select SOC_RP2350B_M33 if BOARD_ADAFRUIT_METRO_RP2350_RP2350B_M33

boards/adafruit/metro_rp2350/Kconfig.defconfig

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+# Copyright (c) 2025 Pete Johanson
+# SPDX-License-Identifier: Apache-2.0
+
+if BOARD_ADAFRUIT_METRO_RP2350
+
+config USB_SELF_POWERED
+	default n
+
+endif # BOARD_ADAFRUIT_METRO_RP2350

boards/adafruit/metro_rp2350/adafruit_metro_rp2350-pinctrl.dtsi

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+/*
+ * Copyright (c) 2025 Pete Johanson
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/pinctrl/rpi-pico-rp2350b-pinctrl.h>
+
+&pinctrl {
+	uart0_default: uart0_default {
+		group1 {
+			pinmux = <UART0_TX_P0>;
+		};
+
+		group2 {
+			pinmux = <UART0_RX_P1>;
+			input-enable;
+		};
+	};
+
+	i2c0_default: i2c0_default {
+		group1 {
+			pinmux = <I2C0_SDA_P20>;
+			input-enable;
+		};
+
+		group2 {
+			pinmux = <I2C0_SCL_P21>;
+		};
+	};
+
+	adc_default: adc_default {
+		group1 {
+			pinmux = <ADC_CH1_P41>, <ADC_CH2_P42>, <ADC_CH3_P43>,
+				 <ADC_CH4_P44>, <ADC_CH5_P45>, <ADC_CH6_P46>;
+			input-enable;
+		};
+	};
+
+	pwm_default: pwm_default {
+		group1 {
+			pinmux = <PWM_1B_P3>, <PWM_2B_P5>, <PWM_3A_P6>, <PWM_4B_P9>, <PWM_5A_P10>,
+				<PWM_5B_P11>;
+		};
+	};
+
+	pio0_spi0_default: pio0_spi0_default {
+		/* gpio 10 is used for chip select, not assigned to the PIO */
+		group1 {
+			pinmux = <PIO0_P11>, <PIO0_P12>;
+		};
+	};
+
+	pio1_ws2812_default: pio1_ws2812_default {
+		group1 {
+			pinmux = <PIO1_P25>;
+		};
+	};
+};

boards/adafruit/metro_rp2350/adafruit_metro_rp2350_rp2350b_m33.dts

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+/*
+ * Copyright (c) 2025 Pete Johanson
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+
+/* The build system assumes that there's a cpucluster-specific file.
+ *
+ * This file provides composition of the device tree:
+ * 1. The common features of the SoC
+ * 2. Core-specific configuration.
+ * 3. Board-specific configuration.
+ */
+#include <raspberrypi/rpi_pico/rp2350b.dtsi>
+#include <raspberrypi/rpi_pico/m33.dtsi>
+
+#include <freq.h>
+
+#include <zephyr/dt-bindings/gpio/arduino-header-r3.h>
+#include <zephyr/dt-bindings/i2c/i2c.h>
+#include <zephyr/dt-bindings/led/led.h>
+#include <zephyr/dt-bindings/pwm/pwm.h>
+
+#include "adafruit_metro_rp2350-pinctrl.dtsi"
+
+/ {
+	chosen {
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+		zephyr,console = &uart0;
+		zephyr,shell-uart = &uart0;
+		zephyr,code-partition = &code_partition;
+	};
+
+	aliases {
+		watchdog0 = &wdt0;
+		led-strip = &ws2812;
+		led0 = &user_led;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		user_led: user_led {
+			gpios = <&gpio0 23 GPIO_ACTIVE_LOW>;
+			label = "USER_LED";
+		};
+	};
+
+	arduino_header: connector {
+		compatible = "arduino-header-r3";
+		#gpio-cells = <2>;
+		gpio-map-mask = <0xffffffff 0xffffffc0>;
+		gpio-map-pass-thru = <0 0x3f>;
+		gpio-map =
+			   <ARDUINO_HEADER_R3_A0 0 &gpio0_hi 9 0>,
+			   <ARDUINO_HEADER_R3_A1 0 &gpio0_hi 10 0>,
+			   <ARDUINO_HEADER_R3_A2 0 &gpio0_hi 11 0>,
+			   <ARDUINO_HEADER_R3_A3 0 &gpio0_hi 12 0>,
+			   <ARDUINO_HEADER_R3_A4 0 &gpio0_hi 13 0>,
+			   <ARDUINO_HEADER_R3_A5 0 &gpio0_hi 14 0>,
+			   <ARDUINO_HEADER_R3_D0 0 &gpio0 1 0>,
+			   <ARDUINO_HEADER_R3_D1 0 &gpio0 0 0>,
+			   <ARDUINO_HEADER_R3_D2 0 &gpio0 2 0>,
+			   <ARDUINO_HEADER_R3_D3 0 &gpio0 3 0>,
+			   <ARDUINO_HEADER_R3_D4 0 &gpio0 4 0>,
+			   <ARDUINO_HEADER_R3_D5 0 &gpio0 5 0>,
+			   <ARDUINO_HEADER_R3_D6 0 &gpio0 6 0>,
+			   <ARDUINO_HEADER_R3_D7 0 &gpio0 7 0>,
+			   <ARDUINO_HEADER_R3_D8 0 &gpio0 8 0>,
+			   <ARDUINO_HEADER_R3_D9 0 &gpio0 9 0>,
+			   <ARDUINO_HEADER_R3_D10 0 &gpio0 10 0>,
+			   <ARDUINO_HEADER_R3_D11 0 &gpio0 11 0>,
+			   <ARDUINO_HEADER_R3_D12 0 &gpio0 22 0>,
+			   <ARDUINO_HEADER_R3_D13 0 &gpio0 23 0>,
+			   <ARDUINO_HEADER_R3_D14 0 &gpio0 16 0>,
+			   <ARDUINO_HEADER_R3_D15 0 &gpio0 17 0>;
+	};
+
+	arduino_adc: analog-connector {
+		compatible = "arduino,uno-adc";
+		#io-channel-cells = <1>;
+		io-channel-map = <0 &adc 1>,	/* A0 = GPIO41 = ADC1 */
+				 <1 &adc 2>,	/* A1 = GPIO42 = ADC2 */
+				 <2 &adc 3>,	/* A2 = GPIO43 = ADC3 */
+				 <3 &adc 4>,	/* A3 = GPIO44 = ADC4 */
+				 <4 &adc 5>,	/* A4 = GPIO45 = ADC5 */
+				 <5 &adc 6>;	/* A5 = GPIO46 = ADC6 */
+	};
+};
+
+&flash0 {
+	reg = <0x10000000 DT_SIZE_M(16)>;
+
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		/* Reserved memory for an image definition block. The block is much
+		 * smaller than 256 bytes, but in practice the linker places the vector
+		 * table at a much larger alignment offset.
+		 */
+		image_def: partition@0 {
+			label = "image_def";
+			reg = <0x00000000 0x100>;
+			read-only;
+		};
+
+		/*
+		 * Usable flash. Starts at 0x100, after the image definition block.
+		 * The partition size is 4MB minus the 0x100 bytes taken by the
+		 * image definition.
+		 */
+		code_partition: partition@100 {
+			label = "code-partition";
+			reg = <0x100 (DT_SIZE_M(16) - 0x100)>;
+			read-only;
+		};
+	};
+};
+
+&uart0 {
+	current-speed = <115200>;
+	status = "okay";
+	pinctrl-0 = <&uart0_default>;
+	pinctrl-names = "default";
+};
+
+&gpio0 {
+	status = "okay";
+};
+
+&i2c0 {
+	clock-frequency = <I2C_BITRATE_STANDARD>;
+	pinctrl-0 = <&i2c0_default>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&adc {
+	pinctrl-0 = <&adc_default>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&pwm {
+	pinctrl-0 = <&pwm_default>;
+	pinctrl-names = "default";
+	divider-int-0 = <255>;
+};
+
+&timer0 {
+	status = "okay";
+};
+
+zephyr_udc0: &usbd {
+	status = "okay";
+};
+
+&pio0 {
+	status = "okay";
+
+	arduion_spi: pio0_spi0 {
+		compatible = "raspberrypi,pico-spi-pio";
+		clocks = < &clocks RPI_PICO_CLKID_CLK_SYS >;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		cs-gpios = <&gpio0 10 GPIO_ACTIVE_LOW>;
+		clk-gpios = <&gpio0 13 GPIO_ACTIVE_HIGH>;
+		mosi-gpios = <&gpio0 11 GPIO_ACTIVE_HIGH>;
+		miso-gpios = <&gpio0 12 GPIO_ACTIVE_HIGH>;
+		pinctrl-0 = <&pio0_spi0_default>;
+		pinctrl-names = "default";
+	};
+};
+
+&pio1 {
+	status = "okay";
+
+	pio-ws2812 {
+		compatible = "worldsemi,ws2812-rpi_pico-pio";
+		status = "okay";
+		pinctrl-0 = <&pio1_ws2812_default>;
+		pinctrl-names = "default";
+		bit-waveform = <3>, <3>, <4>;
+
+		ws2812: ws2812 {
+			status = "okay";
+			gpios = <&gpio0 25 GPIO_ACTIVE_HIGH>;
+			chain-length = <1>;
+			color-mapping = <LED_COLOR_ID_GREEN
+					LED_COLOR_ID_RED
+					LED_COLOR_ID_BLUE>;
+			reset-delay = <280>;
+			frequency = <800000>;
+		};
+	};
+};
+
+
+arduino_serial: &uart0 {};
+arduino_i2c: &i2c0 {};

boards/adafruit/metro_rp2350/adafruit_metro_rp2350_rp2350b_m33.yaml

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+identifier: adafruit_metro_rp2350/rp2350b/m33
+name: Adafruit Metro RP2350 (Cortex-M33)
+type: mcu
+arch: arm
+flash: 16384
+ram: 520
+toolchain:
+  - zephyr
+  - gnuarmemb
+supported:
+  - adc
+  - clock
+  - counter
+  - dma
+  - gpio
+  - hwinfo
+  - i2c
+  - pwm
+  - spi
+  - uart

boards/adafruit/metro_rp2350/adafruit_metro_rp2350_rp2350b_m33_defconfig

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+# This configuration is orthogonal to whether the Cortex-M33 or Hazard3 cores
+# are in use, but Zephyr does not support providing a qualifier-agnostic
+# _defconfig file.
+CONFIG_BUILD_OUTPUT_HEX=y
+CONFIG_BUILD_OUTPUT_UF2=y
+CONFIG_CLOCK_CONTROL=y
+CONFIG_CONSOLE=y
+CONFIG_GPIO=y
+CONFIG_RESET=y
+CONFIG_SERIAL=y
+CONFIG_UART_CONSOLE=y
+CONFIG_UART_INTERRUPT_DRIVEN=y
+CONFIG_USE_DT_CODE_PARTITION=y

boards/adafruit/metro_rp2350/board.cmake

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+# SPDX-License-Identifier: Apache-2.0
+
+if("${RPI_PICO_DEBUG_ADAPTER}" STREQUAL "")
+	set(RPI_PICO_DEBUG_ADAPTER "cmsis-dap")
+endif()
+
+board_runner_args(openocd --cmd-pre-init "source [find interface/${RPI_PICO_DEBUG_ADAPTER}.cfg]")
+board_runner_args(openocd --cmd-pre-init "source [find target/rp2350.cfg]")
+
+# The adapter speed is expected to be set by interface configuration.
+# The Raspberry Pi's OpenOCD fork doesn't, so match their documentation at
+# https://www.raspberrypi.com/documentation/microcontrollers/debug-probe.html#debugging-with-swd
+board_runner_args(openocd --cmd-pre-init "set_adapter_speed_if_not_set 5000")
+
+board_runner_args(uf2 "--board-id=RP2350")
+
+include(${ZEPHYR_BASE}/boards/common/uf2.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/openocd.board.cmake)

boards/adafruit/metro_rp2350/board.yml

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+board:
+  name: adafruit_metro_rp2350
+  full_name: Adafruit Metro RP2350
+  vendor: adafruit
+  socs:
+  - name: rp2350b

boards/adafruit/metro_rp2350/doc/index.rst

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+.. zephyr:board:: adafruit_metro_rp2350
+
+Overview
+********
+
+Choo! Choo! This is the RP2350 Metro Line, making all station stops at "Dual Cortex M33 mountain",
+"528K RAM round-about" and "16 Megabytes of Flash town". This train is piled high with hardware that
+complements the Raspberry Pi RP2350 chip to make it an excellent development board for projects that
+want Arduino-shape-compatibility or just need the extra space and debugging ports.
+
+The Adafruit Metro RP2350 is the second Metro board to use the Rasperry Pi Pico family.
+
+There are many limitations of the board currently. Including but not limited to:
+- The Zephyr build only supports configuring the RP2350B with the Cortex-M33 cores.
+- As with other RP2040/RP2350 devices, there's no support for running any code on the second core.
+
+Hardware
+********
+
+- RP2350 main chip, 150MHz clock, 3.3V logic
+- 16 MB of QSPI flash for program storage
+- 37 Available GPIO: 23 on the socket/SPI headers, 12 on HSTX port, and another 2 for USB host. 6 of which are also analog inputs
+- Micro SD card socket wired up for SPI interfacing, also has extra pins connected for advanced-user SDIO interfacing (note that there's no code for SDIO in Arduino/Python, so this is a super-cutting-edge setup)
+- 5V Buck Converter featuring TPS563201 6~17V DC input and up to 2A output
+- Onboard RGB NeoPixel
+- Onboard #23 LED
+- Stemma QT port for I2C peripherals and sensors
+- 22-pin 3-lane differential HSTX FPC port with 'Pi 5' compatible pinout, makes for quick DVI video output. Or, this also provides 12 extra GPIO that can be used for more pins.
+- Reset and Boot buttons on PCB edge
+- Pico Probe debug port - 3 pin JST SH compatible
+- USB Type C power and data
+- 5.5mm / 2.1mm DC jack for 6-17VDC power
+- On/off switch for DC jack
+- RX / TX switch for swapping D0 and D1 locations
+- USB Host breakout pads - with controllable 5V power and D+/D- for bitbang USB Host.
+- GPIO pin numbers match classic Arduino pins, other than GPIO 12 and 13 as those are needed for HSTX connectivity
+
+Supported Features
+==================
+
+.. zephyr:board-supported-hw::
+
+Connections and IOs
+===================
+
+The default pin mapping is unchanged from the Pico 1 (see :ref:`rpi_pico_pin_mapping`).
+
+Programming and Debugging
+*************************
+
+As with other RP3250 devices, the SWD interface can be used to program and debug the
+device, e.g. using OpenOCD with the `Raspberry Pi Debug Probe <https://www.raspberrypi.com/documentation/microcontrollers/debug-probe.html>`_ .
+
+References
+**********
+
+.. target-notes::