Orange pi zero using mainline latest image. Somehow i couldn't manage to set up a c++ project with libusbgx so I am using console commands for gadgetfs for hid device emulation.  I want to disable otg dual role functionality of micro usb port .  I think i need to mess with overlay but i have no experience and i think i should change the usb for micro usb port but i am not sure how to do. Removing usb otg descriptor is enough too. Thanks

I will try to go back to the legacy image and try to edit fex file according to here https://linux-sunxi.org/Fex_Guide#USB_control_flags All i want to do is removing otg functionality and use  it device only.  I wont ever need usb host in micro usb port.

Update http://elixir.free-electrons.com/linux/latest/source/drivers/usb/musb/musb_gadget.c#L1868 https://www.kernel.org/doc/htmldocs/gadget/otg.html i will edit the kernel and see if that works.

I edited musb_gadget.c sunxi-next conf file and selected gadget only when building the kernel and it works like i wanted. Not sure if all these modifications are required so there is no more otg descriptor.