From 6c0a45e66de8e14944de172ff7d1817cfb8be8c5 Mon Sep 17 00:00:00 2001
From: Dmitry Ilyin <6576495+widgetii@users.noreply.github.com>
Date: Fri, 24 Jul 2026 16:47:07 +0300
Subject: [PATCH] gk7205v200: enable USB (UVC) webcam kernel support (fpv)
 (#112)

Enable the media / V4L2 / uvcvideo kernel stack so a USB camera exposes
/dev/videoN for majestic's usbcam second-camera path.

To fit the 8M NOR (2M kernel / 5M rootfs) without dropping any sensor
library, uvcvideo and the videobuf2 framework are built INTO the kernel
(=y) instead of shipped as rootfs modules: the kernel partition had ~55 KB
of spare room while the rootfs was tight, so ~44 KB of weight moves from
rootfs to kernel. Resulting images: uImage 2022.8 KB / 2048 KB (25 KB
spare), rootfs squashfs 5080 KB / 5120 KB (40 KB spare).

GSPCA -- a separate driver for non-UVC webcams, pulled in by "default m
depends on VIDEO_V4L2" -- is disabled.

No kernel patch is carried: mmap capture works on stock uvcvideo once
majestic aligns its mmap() prototype with this MMAP_MUSL build's
uint32_t-offset shim (a userspace fix), so the earlier read()/fileio
uvcvideo patch is not needed.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
---
 .../gk7205v200/gk7205v200.generic-fpv.config  | 27 +++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/devices/common/br-ext-chip-goke/board/gk7205v200/gk7205v200.generic-fpv.config b/devices/common/br-ext-chip-goke/board/gk7205v200/gk7205v200.generic-fpv.config
index 224bf81..3fe76a6 100644
--- a/devices/common/br-ext-chip-goke/board/gk7205v200/gk7205v200.generic-fpv.config
+++ b/devices/common/br-ext-chip-goke/board/gk7205v200/gk7205v200.generic-fpv.config
@@ -765,7 +765,7 @@ CONFIG_REGMAP=y
 CONFIG_REGMAP_I2C=y
 CONFIG_REGMAP_SPI=y
 CONFIG_REGMAP_MMIO=y
-# CONFIG_DMA_SHARED_BUFFER is not set
+CONFIG_DMA_SHARED_BUFFER=y
 CONFIG_DMA_CMA=y
 
 #
@@ -1644,7 +1644,30 @@ CONFIG_MFD_SYSCON=y
 # CONFIG_MFD_WM8350_I2C is not set
 # CONFIG_MFD_WM8994 is not set
 # CONFIG_REGULATOR is not set
-# CONFIG_MEDIA_SUPPORT is not set
+
+#
+# Multimedia support
+#
+CONFIG_MEDIA_SUPPORT=y
+CONFIG_MEDIA_CAMERA_SUPPORT=y
+# CONFIG_MEDIA_ANALOG_TV_SUPPORT is not set
+# CONFIG_MEDIA_DIGITAL_TV_SUPPORT is not set
+# CONFIG_MEDIA_RADIO_SUPPORT is not set
+# CONFIG_MEDIA_SDR_SUPPORT is not set
+# CONFIG_MEDIA_RC_SUPPORT is not set
+# CONFIG_MEDIA_CONTROLLER is not set
+CONFIG_VIDEO_DEV=y
+CONFIG_VIDEO_V4L2=y
+# CONFIG_VIDEO_ADV_DEBUG is not set
+# CONFIG_VIDEO_FIXED_MINOR_RANGES is not set
+CONFIG_VIDEOBUF2_CORE=y
+CONFIG_VIDEOBUF2_V4L2=y
+CONFIG_VIDEOBUF2_MEMOPS=y
+CONFIG_VIDEOBUF2_VMALLOC=y
+CONFIG_MEDIA_USB_SUPPORT=y
+CONFIG_USB_VIDEO_CLASS=y
+# CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV is not set
+# CONFIG_USB_GSPCA is not set
 
 #
 # Graphics support