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usb: gadget: uvc: Allow definition of XUs in configfs
The UVC gadget at present has no support for extension units. Add the infrastructure to uvc_configfs.c that allows users to create XUs via configfs. These will be stored in a new child of uvcg_control_grp_type with the name "extensions". Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com> Link: https://lore.kernel.org/r/20230206161802.892954-4-dan.scally@ideasonboard.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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