samples: rpi_pico: create dedicated boards/rpi_pico/boot_stage2 sample

CODEOWNERS

@@ -45,6 +45,7 @@
 /soc/arm/nuvoton_npcx/                    @MulinChao @WealianLiao @ChiHuaL
 /soc/arm/nuvoton_numicro/                 @ssekar15
 /soc/arm/quicklogic_eos_s3/               @kowalewskijan @kgugala
+/soc/arm/rpi_pico/                        @yonsch
 /soc/arm/silabs_exx32/efm32pg1b/          @rdmeneze
 /soc/arm/silabs_exx32/efr32mg21/          @l-alfred
 /soc/arm/st_stm32/                        @erwango
@@ -127,6 +128,7 @@
 /boards/arm/quick_feather/                @kowalewskijan @kgugala
 /boards/arm/rak4631_nrf52840/             @gpaquet85
 /boards/arm/rak5010_nrf52840/             @gpaquet85
+/boards/arm/rpi_pico/                     @yonsch
 /boards/arm/ronoth_lodev/                 @NorthernDean
 /boards/arm/xmc45_relax_kit/              @parthitce
 /boards/arm/sam4e_xpro/                   @nandojve
@@ -262,6 +264,7 @@
 /drivers/gpio/*eos_s3*                    @wtatarski @kowalewskijan @kgugala
 /drivers/gpio/*rcar*                      @julien-massot
 /drivers/gpio/*esp32*                     @glaubermaroto
+/drivers/gpio/*rpi_pico*                  @yonsch
 /drivers/hwinfo/                          @alexanderwachter
 /drivers/i2c/i2c_common.c                 @sjg20
 /drivers/i2c/i2c_emul.c                   @sjg20
@@ -349,6 +352,7 @@
 /drivers/serial/uart_mcux_iuart.c         @Mani-Sadhasivam
 /drivers/serial/Kconfig.rtt               @carlescufi @pkral78
 /drivers/serial/uart_rtt.c                @carlescufi @pkral78
+/drivers/serial/*rpi_pico*                @yonsch
 /drivers/serial/Kconfig.xlnx              @wjliang
 /drivers/serial/uart_xlnx_ps.c            @wjliang
 /drivers/serial/uart_xlnx_uartlite.c      @henrikbrixandersen
@@ -443,6 +447,7 @@
 /dts/arm/nuvoton/                         @ssekar15 @MulinChao @WealianLiao @ChiHuaL
 /dts/arm/nxp/                             @mmahadevan108 @dleach02
 /dts/arm/microchip/                       @franciscomunoz @albertofloyd @sjvasanth1
+/dts/arm/rpi_pico/                        @yonsch
 /dts/arm/silabs/efm32_pg_1b.dtsi          @rdmeneze
 /dts/arm/silabs/efm32gg11b*               @oanerer
 /dts/arm/silabs/efm32_jg_pg*              @chrta
@@ -484,6 +489,7 @@
 /dts/bindings/*/nordic*                   @anangl
 /dts/bindings/*/nxp*                      @mmahadevan108 @dleach02
 /dts/bindings/*/openisa*                  @dleach02
+/dts/bindings/*/raspberrypi*pico*         @yonsch
 /dts/bindings/*/st*                       @erwango
 /dts/bindings/sensor/ams*                 @alexanderwachter
 /dts/bindings/*/sifive*                   @mateusz-holenko @kgugala @pgielda

boards/arm/rpi_pico/Kconfig.board

@@ -0,0 +1,6 @@
+# Copyright (c) 2021 Yonatan Schachter
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_RPI_PICO
+	bool "Raspberry Pi Pico Board"
+	depends on SOC_RP2040

boards/arm/rpi_pico/Kconfig.defconfig

@@ -0,0 +1,12 @@
+# Copyright (c) 2021 Yonatan Schachter
+# SPDX-License-Identifier: Apache-2.0
+
+if BOARD_RPI_PICO
+
+config BOARD
+	default "rpi_pico"
+
+config RP2_FLASH_W25Q080
+	default y
+
+endif # BOARD_RPI_PICO

boards/arm/rpi_pico/doc/index.rst

@@ -0,0 +1,59 @@
+.. _rpi_pico:
+
+Raspberry Pi Pico
+#################
+
+Overview
+********
+
+The Raspberry Pi Pico is a small, low-cost, versatile board from
+Raspberry Pi. It is equipped with an RP2040 SoC, an on-board LED,
+a USB connector, and an SWD interface. The USB bootloader allows it
+to be flashed without any adapter, in a drag-and-drop manner.
+It is also possible to flash and debug the Pico with its SWD interface,
+using an external adapter.
+
+Hardware
+********
+- Dual core Arm Cortex-M0+ processor running up to 133MHz
+- 264KB on-chip SRAM
+- 2MB on-board QSPI flash with XIP capabilities
+- 26 GPIO pins
+- 3 Analog inputs
+- 2 UART peripherals
+- 2 SPI controllers
+- 2 I2C controllers
+- 16 PWM channels
+- USB 1.1 controller (host/device)
+- 8 Programmable I/O (PIO) for custom peripherals
+- On-board LED
+
+
+.. figure:: img/rpi_pico.png
+     :width: 150px
+     :align: center
+     :alt: Raspberry Pi Pico
+
+     Raspberry Pi Pico (Image courtesy of Raspberry Pi)
+
+Supported Features
+==================
+
+The rpi_pico board configuration supports the following
+hardware features:
+
+.. list-table::
+   :header-rows: 1
+
+   * - Peripheral
+     - Kconfig option
+     - Devicetree compatible
+   * - NVIC
+     - N/A
+     - :dtcompatible:`arm,v6m-nvic`
+   * - UART
+     - :kconfig:`CONFIG_SERIAL`
+     - :dtcompatible:`rpi,pico-uart`
+   * - GPIO
+     - :kconfig:`CONFIG_GPIO`
+     - :dtcompatible:`rpi,pico-gpio`

boards/arm/rpi_pico/rpi_pico-pinctrl.dtsi

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2021, Yonatan Schachter
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <dt-bindings/pinctrl/rpi-pico-rp2040-pinctrl.h>
+
+&pinctrl {
+	uart0_default: uart0_default {
+		group1 {
+			pinmux = <UART0_TX_P0>;
+		};
+		group2 {
+			pinmux = <UART0_RX_P1>;
+			input-enable;
+		};
+	};
+};

boards/arm/rpi_pico/rpi_pico.dts

@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2021 Yonatan Schachter
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+
+#include <rpi_pico/rp2040.dtsi>
+#include "rpi_pico-pinctrl.dtsi"
+
+/ {
+	chosen {
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+		zephyr,console = &uart0;
+		zephyr,code-partition = &code_partition;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		led0: led_0 {
+			gpios = <&gpio0 25 GPIO_ACTIVE_LOW>;
+			label = "LED";
+		};
+	};
+
+	aliases {
+		led0 = &led0;
+	};
+};
+
+&flash0 {
+	reg = <0x10000000 DT_SIZE_M(2)>;
+
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		/* Reserved memory for the second stage bootloader */
+		settings: partition@0 {
+			label = "settings";
+			reg = <0x00000000 0x100>;
+			read-only;
+		};
+
+		/*
+		 * Usable flash. Starts at 0x100, after the bootloader. The partition
+		 * size is 2MB minus the 0x100 bytes taken by the bootloader.
+		 */
+		code_partition: partition@100 {
+			label = "code-partition";
+			reg = <0x100 (DT_SIZE_M(2) - 0x100)>;
+			read-only;
+		};
+	};
+};
+
+&uart0 {
+	current-speed = <115200>;
+	status = "okay";
+	pinctrl-0 = <&uart0_default>;
+	pinctrl-names = "default";
+};
+
+&gpio0 {
+	status = "okay";
+};

boards/arm/rpi_pico/rpi_pico.yaml

@@ -0,0 +1,10 @@
+identifier: rpi_pico
+name: RaspberryPi-Pico
+type: mcu
+arch: arm
+flash: 2048
+ram: 264
+toolchain:
+  - zephyr
+  - gnuarmemb
+  - xtools

boards/arm/rpi_pico/rpi_pico_defconfig

@@ -0,0 +1,8 @@
+CONFIG_SOC_SERIES_RP2XXX=y
+CONFIG_SOC_RP2040=y
+CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=125000000
+CONFIG_SERIAL=y
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+CONFIG_GPIO=y
+CONFIG_USE_DT_CODE_PARTITION=y