RFC: Platform data for onboard USB assets

[Benjamin Herrenschmidt]

On Thu, 2011-03-17 at 23:22 +0000, Andy Green wrote:
> 
> Is there actually a need for sort of not platform_data but universal 
> vid_pid_specific_usb_device_option_data coming from the board
> definition 
> file or bootloader for *pluggable* usb devices?  udev seems to be
> well 
> established doing that already in a generic, not-platform-specific
> way 
> that can go in all distros and so on nicely.  Maybe this is just my 
> impoverished imagination and people do want, say, some kinds of USB
> mice 
> to operate at higher DPI or whatever when plugged in a specific board 
> because it is that board. 

Except that vid/pid are the -WRONG- way to do that. Your device is
on-board, the proper way to identify it uniquely is it's topological
location, ie path of HW port numbers.

Cheers,
Ben.