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

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Message-ID: <20110311163522.GA9291@kroah.com>
Date:	Fri, 11 Mar 2011 08:35:22 -0800
From:	Greg KH <greg@...ah.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Arnd Bergmann <arnd@...db.de>, andy.green@...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 Fri, Mar 11, 2011 at 04:27:59PM +0000, Mark Brown wrote:
> On Fri, Mar 11, 2011 at 08:14:21AM -0800, Greg KH wrote:
> > On Fri, Mar 11, 2011 at 04:03:09PM +0000, Mark Brown wrote:
> 
> > > Like I say, it's not just MAC addresses that can need configuring this
> > > way - it can be other random "you're wired up this way" type
> > > information that would normally be figured out from the USB IDs.
> 
> > And all of that should be done in userspace, like all other device
> > names, I still fail to see what is so different here from any other type
> > of system.
> 
> I'm actually not that fussed about the MAC address use case itself and
> do tend to agree with you that that's handlable in userspace but for the
> other things that might need to be configured there's a lot of things
> that for non-discoverable buses we're currently passing through platform
> data so switching to bouncing things through userspace would itself be a
> substantial change from other systems.

But USB _is_ discoverable, that's my point.

> You can't in general rely on the system being neatly abstracted and
> while discoverable buses do avoid many problems in this sort of area
> there are still things which can only be discovered through reference to
> the schematics or similar, especially if you care about the microamps.

Again, that's not USB, so it isn't relevant here.

thanks,

greg k-h
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