# Re: RFC: Platform data for onboard USB assets

- From: Andy Green \<hidden\>
- Date: 2011-03-18 22:39:30 
- List: linux-devicetree
- Page: https://ratatoskr.run/linux-devicetree/2011/03/3691796
- Thread: https://ratatoskr.run/lkml/2011/03/3688678/t/2.md

```text
On 03/18/2011 10:37 PM, Somebody in the thread at some point said:
> 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.

Thanks Ben.

I'll go change that VID/PID stuff in my patches right away.

-Andy
```