[U-Boot] RFC USB composite devices

[Tom]

Soon you will see a v2 of my OMAP3 USB device support.
After which I will be working on adding a 'fastboot' device.
Ref : 
https://gforge.ti.com/gf/project/omapzoom/wiki/?pagename=FAQ-8%3A+Zoom-II+Android%C2%A0fastboot

I would like to add this as composite device with the other device being 
usbtty.

The usb device and composite device support seems to be entirely based 
on usbtty.Is there a newer interface that needs some help bringing to 
the mainline? Else, ideas on how to do this cleanly ?

All comments welcome,

Tom