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

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Message-ID: <1300828125.2402.300.camel@pasglop>
Date:	Wed, 23 Mar 2011 08:08:45 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Jaswinder Singh <jaswinder.singh@...aro.org>
Cc:	andy.green@...aro.org, Andy Green <andy@...mcat.com>,
	Linux USB list <linux-usb@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>, arnd@...db.de,
	broonie@...nsource.wolfsonmicro.com, roger.quadros@...ia.com,
	greg@...ah.com, grant.likely@...retlab.ca,
	Nicolas Pitre <nicolas.pitre@...aro.org>
Subject: Re: RFC: Platform data for onboard USB assets

> Q(b) If yes, what 'key' is most suitable for identifying the right
> device
>   to attach the data to ?

We already pointed out that in the case of soldered-in device, the
"path" as in the series of -physical- ports leading to the device is
going to be stable.

For anything else, there's no solution. If the device doesn't have a
unique ID, you are toast, period.

On the other hand, I still think platform_data suck big time. Grant made
some good points about the lack of proper typing for example. I believe
that a device-tree based approach is much better in the long run (and
more flexible) despite Andy odd quasi-religious aversion for it.

Cheers,
Ben.

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