linux-kernel - Re: Non-enumerable devices on USB and other enumerable buses

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Message-ID: <20130820150247.GO30073@sirena.org.uk>
Date:	Tue, 20 Aug 2013 16:02:47 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ian.campbell@...rix.com>,
	Felipe Balbi <balbi@...com>,
	Grant Likely <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-usb <linux-usb@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Non-enumerable devices on USB and other enumerable buses

On Tue, Aug 20, 2013 at 09:19:07PM +0800, Ming Lei wrote:
> On Tue, Aug 20, 2013 at 12:01 AM, Mark Brown <broonie@...nel.org> wrote:

> > I can't parse this at all well - why would DT want to refer to ACPI, do
> > you mean people may wish to look at the code as an example?  As Grant

> I mean usb-acpi provides one approach to retrieve platform data for USB device
> during device enumeration, and the idea might be helpful for you to implement
> similar things based on DT.

Ah, OK.

> > noted DT already has some mechanisms for enumerable buses which looking
> > at the code appears to be broadly what that's doing.

> If the mechanism is ready now, so looks you might post code for review
> and discussion?

There's nothing there for the problem I'm talking about here (devices
that haven't been enumerated yet) and I don't off the top of my head
know if the enumerated case is supported by any buses in Linux yet.  It
is part of the DT specifications and has been implemented on other OSs
but I'd need to go check if Linux actually went and implemented any of
that.

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