boards: arm: Add adafruit_kb2040 board

Add `adafruit_bk2040` board with `sparkfun,pro-micro` header. Signed-off-by: Peter Johanson <peter@peterjohanson.com>

Author: petejohanson

boards/arm/adafruit_kb2040/Kconfig.board

@@ -0,0 +1,6 @@
+# Copyright (c) 2021 Pete Johanson
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_ADAFRUIT_KB2040
+bool "Adafruit KB2040 Board"
+depends on SOC_RP2040

boards/arm/adafruit_kb2040/Kconfig.defconfig

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+# Copyright (c) 2021 Pete Johanson
+# SPDX-License-Identifier: Apache-2.0
+
+if BOARD_ADAFRUIT_KB2040
+
+config BOARD
+default "adafruit_kb2040"
+
+config RP2_FLASH_W25Q080
+default y
+
+endif # BOARD_ADAFRUIT_KB2040

boards/arm/adafruit_kb2040/adafruit_kb2040-pinctrl.dtsi

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2021, Yonatan Schachter
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <dt-bindings/pinctrl/rp2040-pinctrl.h>
+
+&pinctrl {
+uart1_default: uart1_default {
+group1 {
+pinmux = <UART1_TX_P20>;
+};
+group2 {
+pinmux = <UART1_RX_P5>;
+input-enable;
+};
+};
+};

boards/arm/adafruit_kb2040/adafruit_kb2040.dts

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+/*
+ * Copyright (c) 2021 Yonatan Schachter
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+
+#include <raspberrypi/rp2040.dtsi>
+#include "adafruit_kb2040-pinctrl.dtsi"
+#include "sparkfun_pro_micro.dtsi"
+
+/ {
+chosen {
+zephyr,sram = &sram0;
+zephyr,flash = &flash0;
+zephyr,console = &uart1;
+zephyr,code-partition = &code_partition;
+};
+};
+
+&flash0 {
+/* 8MB of flash minus the 0x100 used for
+ * the second stage bootloader
+ */
+reg = <0x10000100 (DT_SIZE_M(8) - 0x100)>;
+
+partitions {
+compatible = "fixed-partitions";
+#address-cells = <1>;
+#size-cells = <1>;
+
+/*
+ * Start at the beginning of usable flash, 8MB minus the
+ * second stage space and the 16 KiB reserved for settings
+ */
+code_partition: partition@0 {
+label = "code";
+reg = <0 ((DT_SIZE_M(8) - 0x100) - DT_SIZE_K(16))>;
+read-only;
+};
+
+/*
+ * The final 16 KiB is reserved for the application.
+ * Storage partition may be used by FCB or LittleFS.
+ */
+storage_partition: partition@7fbe00 {
+label = "storage";
+reg = <0x007fbe00 DT_SIZE_K(16)>;
+};
+};
+};
+
+&uart1 {
+current-speed = <115200>;
+status = "okay";
+pinctrl-0 = <&uart1_default>;
+pinctrl-names = "default";
+};
+
+&gpio0 {
+status = "okay";
+};
+
+&usbd {
+status = "okay";
+};

boards/arm/adafruit_kb2040/adafruit_kb2040.yaml

@@ -0,0 +1,12 @@
+identifier: raspberrypi_pico
+name: RaspberryPi-Pico
+type: mcu
+arch: arm
+flash: 2048
+ram: 264
+toolchain:
+ - zephyr
+ - gnuarmemb
+ - xtools
+supported:
+ - serial

boards/arm/adafruit_kb2040/adafruit_kb2040_defconfig

@@ -0,0 +1,23 @@
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_SOC_SERIES_RP2XXX=y
+CONFIG_SOC_RP2040=y
+CONFIG_BOARD_ADAFRUIT_KB2040=y
+
+CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=240000000
+
+# Enable GPIO
+CONFIG_GPIO=y
+
+# enable uart driver
+CONFIG_SERIAL=y
+
+# enable console
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+
+# Code partition needed to target the correct flash range
+CONFIG_USE_DT_CODE_PARTITION=y
+
+# Output UF2 by default, native bootloader supports it.
+CONFIG_BUILD_OUTPUT_UF2=y

boards/arm/adafruit_kb2040/board.cmake

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2020 Pete Johanson
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+/ {
+pro_micro: connector {
+compatible = "sparkfun,pro-micro";
+#gpio-cells = <2>;
+gpio-map-mask = <0xffffffff 0xffffffc0>;
+gpio-map-pass-thru = <0 0x3f>;
+gpio-map
+= <0 0 &gpio0 0 0>	/* D0 */
+, <1 0 &gpio0 1 0>	/* D1 */
+, <2 0 &gpio0 2 0>	/* D2 */
+, <3 0 &gpio0 3 0>	/* D3 */
+, <4 0 &gpio0 4 0>	/* D4/A6 */
+, <5 0 &gpio0 5 0>	/* D5 */
+, <6 0 &gpio0 6 0>	/* D6/A7 */
+, <7 0 &gpio0 7 0>	/* D7 */
+, <8 0 &gpio0 8 0>	/* D8/A8 */
+, <9 0 &gpio0 9 0>	/* D9/A9 */
+, <10 0 &gpio0 10 0>	/* D10/A10 */
+, <16 0 &gpio0 19 0>	/* D16 */
+, <14 0 &gpio0 20 0>	/* D14 */
+, <15 0 &gpio0 18 0>	/* D15 */
+, <18 0 &gpio0 26 0>	/* D18/A0 */
+, <19 0 &gpio0 27 0>	/* D19/A1 */
+, <20 0 &gpio0 28 0>	/* D20/A2 */
+, <21 0 &gpio0 29 0>	/* D21/A3 */
+;
+};
+
+};
+
+// pro_micro_i2c: &i2c0 {};
+// pro_micro_spi: &spi0 {};
+pro_micro_serial: &uart0 {};

boards/arm/adafruit_kb2040/sparkfun_pro_micro.dtsi

@@ -0,0 +1,35 @@
+# Copyright (C) 2021 Peter Johanson
+# SPDX-License-Identifier: Apache-2.0
+
+description: |
+ GPIO pins exposed on Sparkfun Pro Micro (and compatible devices) headers.
+
+ The Sparkfun Pro Micro layout provides two headers, along opposite
+ edges of the board.
+
+ Proceeding counter-clockwise:
+ * A 12-pin Power and Digital Input header. This has input signals
+ labeled from 0 at the top through 9 at the bottom.
+ * An 12-pin Power and Digital/Analog Input header. This
+ has four power pins, followed by eight inputs, with a
+ non-monotonically decreasing numbering.
+
+ This binding provides a nexus mapping for 18 pins, as depicted below:
+
+ 0 TX0 RAW -
+ 1 RX1 GND -
+ - GND RST -
+ - GND VCC -
+ 2 D2 D21/A3 21
+ 3 D3 D20/A2 20
+ 4 A4 D19/A1 19
+ 5 D5 D18/A0 18
+ 6 D6 D15 15
+ 7 D7 D14 14
+ 8 D8 D16 16
+ 9 D9 D10 10
+
+
+compatible: "sparkfun,pro-micro-gpio"
+
+include: [gpio-nexus.yaml, base.yaml]

dts/bindings/gpio/sparkfun-pro-micro-header.yaml

@@ -558,6 +558,7 @@ solidrun	SolidRun
 solomon	Solomon Systech Limited
 sony	Sony Corporation
 spansion	Spansion Inc.
+sparkfun	SparkFun Electronics
 sprd	Spreadtrum Communications Inc.
 sst	Silicon Storage Technology, Inc.
 sstar	Xiamen Xingchen(SigmaStar) Technology Co., Ltd. (formerly part of MStar Semiconductor, Inc.)