[openwrt/openwrt] kernel: add support for mem2mem devices

[LEDE Commits]

xback pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/0295a29f1d2bfcd973261ee69970e109adb60baf

commit 0295a29f1d2bfcd973261ee69970e109adb60baf
Author: Koen Vandeputte <koen.vandeputte at citymesh.com>
AuthorDate: Wed Feb 8 16:26:36 2023 +0100

    kernel: add support for mem2mem devices
    
    This allows addition of devices which use these kernel
    modules.
    
    This also adds a package for handling dma within video2buf.
    These are only build when selected by a caller
    
    Signed-off-by: Koen Vandeputte <koen.vandeputte at citymesh.com>
---
 package/kernel/linux/modules/video.mk | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/package/kernel/linux/modules/video.mk b/package/kernel/linux/modules/video.mk
index f1e61f33a5..d6bacbbf12 100644
--- a/package/kernel/linux/modules/video.mk
+++ b/package/kernel/linux/modules/video.mk
@@ -10,6 +10,7 @@ VIDEO_MENU:=Video Support
 
 V4L2_DIR=v4l2-core
 V4L2_USB_DIR=usb
+V4L2_MEM2MEM_DIR=platform
 
 #
 # Video Display
@@ -1044,3 +1045,25 @@ define KernelPackage/video-gspca-konica/description
 endef
 
 $(eval $(call KernelPackage,video-gspca-konica))
+
+#
+# Video Processing
+#
+
+define KernelPackage/video-mem2mem
+  SUBMENU:=$(VIDEO_MENU)
+  TITLE:=Memory 2 Memory device support
+  HIDDEN:=1
+  DEPENDS:=+kmod-video-videobuf2
+  KCONFIG:= CONFIG_V4L_MEM2MEM_DRIVERS=y
+  FILES:= $(LINUX_DIR)/drivers/media/$(V4L2_DIR)/v4l2-mem2mem.ko
+  AUTOLOAD:=$(call AutoLoad,66,v4l2-mem2mem)
+  $(call AddDepends/video)
+endef
+
+define KernelPackage/video-mem2mem/description
+  Memory 2 memory device support
+endef
+
+$(eval $(call KernelPackage,video-mem2mem))
+