drivers: usb: Add RP2040 USB device support.

Add USB device driver for Rasberry Pico family of controllers.

Signed-off-by: Peter Johanson <[email protected]>

Author: petejohanson

boards/arm/rpi_pico/doc/index.rst

@@ -60,6 +60,9 @@ hardware features:
    * - I2C
      - :kconfig:option:`CONFIG_I2C`
      - :dtcompatible:`snps,designware-i2c`
+   * - USB Device
+     - :kconfig:option:`CONFIG_USB_DEVICE_STACK`
+     - :dtcompatible:`raspberrypi,pico-usbd`
    * - HWINFO
      - :kconfig:option:`CONFIG_HWINFO`
      - N/A

boards/arm/rpi_pico/rpi_pico.dts

@@ -84,3 +84,7 @@
 	pinctrl-0 = <&i2c1_default>;
 	pinctrl-names = "default";
 };
+
+zephyr_udc0: &usbd {
+	status = "okay";
+};

drivers/usb/device/CMakeLists.txt

@@ -5,6 +5,7 @@ if(CONFIG_USB_DEVICE_DRIVER)
 zephyr_library()
 
 zephyr_library_sources_ifdef(CONFIG_USB_DW           usb_dc_dw.c)
+zephyr_library_sources_ifdef(CONFIG_USB_DC_RPI_PICO  usb_dc_rpi_pico.c)
 zephyr_library_sources_ifdef(CONFIG_USB_DC_STM32     usb_dc_stm32.c)
 zephyr_library_sources_ifdef(CONFIG_USB_DC_SAM0      usb_dc_sam0.c)
 zephyr_library_sources_ifdef(CONFIG_USB_DC_SAM_USBC  usb_dc_sam_usbc.c)

drivers/usb/device/Kconfig

@@ -3,6 +3,8 @@
 # Copyright (c) 2016 Wind River Systems, Inc.
 # SPDX-License-Identifier: Apache-2.0
 
+DT_COMPAT_RPI_PICO_USBD := raspberrypi,pico-usbd
+
 menuconfig USB_DEVICE_DRIVER
 	bool "USB device controller drivers"
 	help
@@ -31,6 +33,13 @@ config USB_DW_USB_2_0
 	help
 	  Indicates whether or not USB specification version 2.0 is supported
 
+config USB_DC_RPI_PICO
+	bool "USB device controller driver for Raspberry Pi Pico devices"
+	default $(dt_compat_enabled,$(DT_COMPAT_RPI_PICO_USBD))
+	depends on SOC_SERIES_RP2XXX
+	help
+	  Enable USB support on the RP2 family of processors.
+
 config USB_DC_STM32
 	bool "USB device controller driver for STM32 devices"
 	depends on SOC_FAMILY_STM32