boards/lckfb-szpi-esp32s3: add UVC camera standalone defconfig

Add UVC configuration for lckfb-szpi-esp32s3 board based on gc0308
camera config, with USB OTG and UVC gadget driver enabled in
standalone (non-composite) mode.

- defconfig: enable ESP32S3_OTG, USBUVC, UVC example app
- board doc: add uvc section with usage and host verification

Signed-off-by: wangjianyu3 <wangjianyu3@xiaomi.com>

Author: JianyuWang0623

Documentation/platforms/xtensa/esp32s3/boards/lckfb-szpi-esp32s3/index.rst

@@ -576,3 +576,50 @@ Then use the camera example to capture a frame::
 
   $ adb -s 1234 shell
   nsh> camera
+
+uvc
+---
+
+USB Video Class (UVC) webcam configuration. Streams YUYV frames from the
+GC0308 DVP camera to a USB host via the UVC gadget driver (Bulk transport).
+The application queries the sensor resolution at runtime and configures the
+UVC descriptors accordingly. Console is accessible over UART0 (serial).
+
+The UVC driver also supports composite USB device mode
+(``CONFIG_USBUVC_COMPOSITE``), allowing it to be combined with other USB
+class drivers (e.g., CDC/ACM) in a single composite device.
+
+You can run the configuration and compilation procedure::
+
+  $ ./tools/configure.sh lckfb-szpi-esp32s3:uvc
+  $ make flash -j$(nproc) ESPTOOL_PORT=/dev/ttyUSB0
+
+The application should work as follows:
+
+1. Create ``/dev/video0`` via ``capture_initialize()`` and open it.
+2. Query the sensor's native resolution with ``VIDIOC_ENUM_FRAMESIZES``
+   (pixel format ``V4L2_PIX_FMT_YUYV``), then ``VIDIOC_S_FMT`` to configure.
+3. Fill ``struct uvc_params_s`` with the queried width, height and fps,
+   pass it to ``boardctl(BOARDIOC_USBDEV_CONTROL)`` via ``ctrl.handle``
+   so the UVC gadget builds USB descriptors matching the actual sensor.
+4. Open ``/dev/uvc0``, use ``poll()`` with ``POLLOUT`` to wait for the
+   USB host to start streaming.
+5. Loop: ``VIDIOC_QBUF`` / ``VIDIOC_DQBUF`` to capture a YUYV frame,
+   then ``write()`` to ``/dev/uvc0``.
+
+On the host side, verify the device is recognized::
+
+  $ sudo dmesg
+  [32982831.662622] usb 1-9.3.3: new full-speed USB device number 72 using xhci_hcd
+  [32982831.752856] usb 1-9.3.3: New USB device found, idVendor=1d6b, idProduct=0102, bcdDevice= 1.00
+  [32982831.752860] usb 1-9.3.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
+  [32982831.752861] usb 1-9.3.3: Product: NuttX UVC Camera
+  [32982831.752862] usb 1-9.3.3: Manufacturer: NuttX
+  [32982831.752863] usb 1-9.3.3: SerialNumber: 0001
+  [32982831.756625] usb 1-9.3.3: Found UVC 1.10 device NuttX UVC Camera (1d6b:0102)
+
+Then open the webcam with any UVC viewer (e.g. ``cheese``, ``guvcview``,
+or ``ffplay``)::
+
+  $ cheese
+

boards/xtensa/esp32s3/lckfb-szpi-esp32s3/configs/uvc/defconfig

@@ -0,0 +1,66 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed .config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that includes your
+# modifications.
+#
+# CONFIG_ARCH_LEDS is not set
+# CONFIG_NSH_ARGCAT is not set
+# CONFIG_NSH_CMDOPT_HEXDUMP is not set
+CONFIG_ARCH="xtensa"
+CONFIG_ARCH_BOARD="lckfb-szpi-esp32s3"
+CONFIG_ARCH_BOARD_COMMON=y
+CONFIG_ARCH_BOARD_ESP32S3_LCKFB_SZPI=y
+CONFIG_ARCH_CHIP="esp32s3"
+CONFIG_ARCH_CHIP_ESP32S3=y
+CONFIG_ARCH_CHIP_ESP32S3WROOM1N16R8=y
+CONFIG_ARCH_INTERRUPTSTACK=2048
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_ARCH_XTENSA=y
+CONFIG_BOARDCTL_USBDEVCTRL=y
+CONFIG_BOARD_LOOPSPERMSEC=16717
+CONFIG_BUILTIN=y
+CONFIG_DEBUG_FULLOPT=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_DEV_GPIO=y
+CONFIG_ESP32S3_CAM=y
+CONFIG_ESP32S3_GPIO_IRQ=y
+CONFIG_ESP32S3_I2C0=y
+CONFIG_ESP32S3_OTG=y
+CONFIG_ESP32S3_OTG_ENDPOINT_NUM=2
+CONFIG_ESP32S3_UART0=y
+CONFIG_ESPRESSIF_LEDC=y
+CONFIG_ESPRESSIF_LEDC_CHANNEL0_PIN=42
+CONFIG_ESPRESSIF_LEDC_TIMER0=y
+CONFIG_FS_PROCFS=y
+CONFIG_FS_TMPFS=y
+CONFIG_GPIO_LOWER_HALF=y
+CONFIG_HAVE_CXX=y
+CONFIG_HAVE_CXXINITIALIZE=y
+CONFIG_IDLETHREAD_STACKSIZE=3072
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INIT_STACKSIZE=4096
+CONFIG_INTELHEX_BINARY=y
+CONFIG_IOEXPANDER=y
+CONFIG_IOEXPANDER_PCA9557=y
+CONFIG_LINE_MAX=64
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_READLINE=y
+CONFIG_PREALLOC_TIMERS=4
+CONFIG_RAM_SIZE=114688
+CONFIG_RAM_START=0x20000000
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_WAITPID=y
+CONFIG_START_DAY=6
+CONFIG_START_MONTH=12
+CONFIG_START_YEAR=2011
+CONFIG_SYSLOG_BUFFER=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_UART0_SERIAL_CONSOLE=y
+CONFIG_USBUVC=y
+CONFIG_VIDEO=y
+CONFIG_VIDEO_GC0308=y
+CONFIG_VIDEO_STREAM=y