boards: nordic: Add support for nRF52833dk_nrf52820 board

This commit adds support for nRF52820 development on nRF52833DK.
Changes afffects:
 - Introduce files related to board description.
 - Add blank documentation file (for future update).
 - configuration files for build process.

Signed-off-by: Mieszko Mierunski <mieszko.mierunski@nordicsemi.no>

boards/arm/nrf52833dk_nrf52820/Kconfig

@@ -0,0 +1,10 @@
+# nRF52833DK nRF52820 board configuration
+
+# Copyright (c) 2020 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_ENABLE_DCDC
+	bool "Enable DCDC mode"
+	select SOC_DCDC_NRF52X
+	default y
+	depends on BOARD_NRF52833DK_NRF52820

boards/arm/nrf52833dk_nrf52820/Kconfig.board

@@ -0,0 +1,8 @@
+# nRF52833DK nRF52820 board configuration
+
+# Copyright (c) 2020 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_NRF52833DK_NRF52820
+	bool "nRF52833 DK NRF52820"
+	depends on SOC_NRF52820_QDAA

boards/arm/nrf52833dk_nrf52820/Kconfig.defconfig

@@ -0,0 +1,24 @@
+# nRF52833DK nRF52820 board configuration
+
+# Copyright (c) 2020 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+if BOARD_NRF52833DK_NRF52820
+
+config BOARD
+	default "nrf52833dk_nrf52820"
+
+if USB
+
+config USB_NRFX
+	default y
+
+config USB_DEVICE_STACK
+	default y
+
+endif # USB
+
+config BT_CTLR
+	default BT
+
+endif # BOARD_NRF52833DK_NRF52820

boards/arm/nrf52833dk_nrf52820/board.cmake

@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: Apache-2.0
+
+board_runner_args(nrfjprog "--nrf-family=NRF52")
+board_runner_args(jlink "--device=nrf52" "--speed=4000")
+board_runner_args(pyocd "--target=nrf52820" "--frequency=4000000")
+include(${ZEPHYR_BASE}/boards/common/nrfjprog.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/jlink.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/pyocd.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/openocd-nrf5.board.cmake)

boards/arm/nrf52833dk_nrf52820/doc/index.rst

@@ -0,0 +1,23 @@
+.. _nrf52833dk_nrf52820:
+
+nRF52820 emulation on nRF52833 DK
+#################################
+
+Overview
+********
+
+The nrf52833dk_nrf52820 board is a modified version of the
+:ref:`nrf52833dk_nrf52833` that enforces the limitations imposed by the nRF52820
+IC, which is a variant of the original nRF52833. Since Nordic does not offer a
+development kit for the nRF52820 you can use this board to develop for this IC
+while using the nRF52833 Development Kit (PCA10100).
+
+See :ref:`nrf52833dk_nrf52833` for more information about the development board
+and `nRF52820 website`_ for the official reference on the IC itself.
+
+References
+**********
+
+.. target-notes::
+
+.. _nRF52820 website: https://www.nordicsemi.com/Products/Low-power-short-range-wireless/nRF52820

boards/arm/nrf52833dk_nrf52820/nrf52833dk_nrf52820.dts

@@ -0,0 +1,161 @@
+/*
+ * Copyright (c) 2020 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+#include <nordic/nrf52820_qdaa.dtsi>
+
+/ {
+	model = "Nordic nRF52833 DK NRF52820";
+	compatible = "nordic,nrf52833-dk-nrf52820";
+
+	chosen {
+		zephyr,console = &uart0;
+		zephyr,shell-uart = &uart0;
+		zephyr,uart-mcumgr = &uart0;
+		zephyr,bt-mon-uart = &uart0;
+		zephyr,bt-c2h-uart = &uart0;
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+		zephyr,code-partition = &slot0_partition;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		led0: led_0 {
+			gpios = <&gpio0 13 GPIO_ACTIVE_LOW>;
+			label = "Green LED 0";
+		};
+		led1: led_1 {
+			gpios = <&gpio0 14 GPIO_ACTIVE_LOW>;
+			label = "Green LED 1";
+		};
+		led2: led_2 {
+			gpios = <&gpio0 15 GPIO_ACTIVE_LOW>;
+			label = "Green LED 2";
+		};
+		led3: led_3 {
+			gpios = <&gpio0 16 GPIO_ACTIVE_LOW>;
+			label = "Green LED 3";
+		};
+	};
+
+	pwmleds {
+		compatible = "pwm-leds";
+		pwm_led0: pwm_led_0 {
+			pwms = <&sw_pwm 13>;
+		};
+	};
+
+	buttons {
+		compatible = "gpio-keys";
+		button0: button_0 {
+			gpios = <&gpio0 11 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
+			label = "Push button switch 0";
+		};
+		button1: button_1 {
+			gpios = <&gpio0 12 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
+			label = "Push button switch 1";
+		};
+		button2: button_2 {
+			gpios = <&gpio0 24 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
+			label = "Push button switch 2";
+		};
+		button3: button_3 {
+			gpios = <&gpio0 25 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
+			label = "Push button switch 3";
+		};
+	};
+
+	/* These aliases are provided for compatibility with samples */
+	aliases {
+		led0 = &led0;
+		led1 = &led1;
+		led2 = &led2;
+		led3 = &led3;
+		sw0 = &button0;
+		sw1 = &button1;
+		sw2 = &button2;
+		sw3 = &button3;
+	};
+};
+
+&gpiote {
+	status = "okay";
+};
+
+&gpio0 {
+	status = "okay";
+};
+
+&uart0 {
+	compatible = "nordic,nrf-uart";
+	status = "okay";
+	current-speed = <115200>;
+	tx-pin = <6>;
+	rx-pin = <8>;
+	rts-pin = <5>;
+	cts-pin = <7>;
+};
+
+&i2c0 {
+	compatible = "nordic,nrf-twi";
+	status = "okay";
+	sda-pin = <28>;
+	scl-pin = <29>;
+};
+
+&i2c1 {
+	compatible = "nordic,nrf-twi";
+	/* Cannot be used together with spi1. */
+	/* status = "okay"; */
+};
+
+&spi0 {
+	compatible = "nordic,nrf-spi";
+	/* Cannot be used together with i2c0. */
+	/* status = "okay"; */
+};
+
+&spi1 {
+	status = "okay";
+	sck-pin = <17>;
+	miso-pin = <20>;
+	mosi-pin = <30>;
+};
+
+&flash0 {
+	/*
+	 * For more information, see:
+	 * http://docs.zephyrproject.org/latest/guides/dts/index.html#flash-partitions
+	 */
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		boot_partition: partition@0 {
+			label = "mcuboot";
+			reg = <0x00000000 0xC000>;
+		};
+		slot0_partition: partition@C000 {
+			label = "image-0";
+			reg = <0x0000C000 0x17000>;
+		};
+		slot1_partition: partition@23000 {
+			label = "image-1";
+			reg = <0x00023000 0x17000>;
+		};
+		storage_partition: partition@3a000 {
+			label = "storage";
+			reg = <0x0003a000 0x00006000>;
+		};
+	};
+};
+
+&usbd {
+	compatible = "nordic,nrf-usbd";
+	status = "okay";
+};

boards/arm/nrf52833dk_nrf52820/nrf52833dk_nrf52820.yaml

@@ -0,0 +1,16 @@
+identifier: nrf52833dk_nrf52820
+name: nRF52833-DK-NRF52820
+type: mcu
+arch: arm
+toolchain:
+  - zephyr
+  - gnuarmemb
+  - xtools
+ram: 32
+flash: 256
+supported:
+  - usb_device
+  - ble
+  - gpio
+  - watchdog
+  - counter

boards/arm/nrf52833dk_nrf52820/nrf52833dk_nrf52820_defconfig

@@ -0,0 +1,24 @@
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_SOC_SERIES_NRF52X=y
+CONFIG_SOC_NRF52820_QDAA=y
+CONFIG_BOARD_NRF52833DK_NRF52820=y
+
+# Enable MPU
+CONFIG_ARM_MPU=y
+
+# Enable RTT
+CONFIG_USE_SEGGER_RTT=y
+
+# enable GPIO
+CONFIG_GPIO=y
+
+# enable uart driver
+CONFIG_SERIAL=y
+
+# enable console
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+
+# additional board options
+CONFIG_GPIO_AS_PINRESET=y

dts/arm/nordic/nrf52820.dtsi

@@ -35,7 +35,7 @@
 		uart-0 = &uart0;
 		gpio-0 = &gpio0;
 		gpiote-0 = &gpiote;
-		wdt-0 = &wdt;
+		wdt-0 = &wdt0;
 		usbd-0 = &usbd;
 		qdec-0 = &qdec;
 		rtc-0 = &rtc0;