linux-kernel - Re: RFC: Platform data for onboard USB assets

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Message-ID: <4D83DF0D.5050006@linaro.org>
Date:	Fri, 18 Mar 2011 22:39:09 +0000
From:	Andy Green <andy@...mcat.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	Arnd Bergmann <arnd@...db.de>, Greg KH <greg@...ah.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	devicetree-discuss@...ts.ozlabs.org,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Linux USB list <linux-usb@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: RFC: Platform data for onboard USB assets

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
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