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

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Message-ID: <CACVXFVOi+pa7G-D91V05qF0Y65rX6ZKk-=i_sbFwL3PCGsdyPw@mail.gmail.com>
Date:	Tue, 20 Aug 2013 21:19:07 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Mark Brown <broonie@...nel.org>
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 12:01 AM, Mark Brown <broonie@...nel.org> wrote:
> On Mon, Aug 19, 2013 at 08:17:53PM +0800, Ming Lei wrote:
>> On Sat, Aug 17, 2013 at 9:29 AM, Alan Stern <stern@...land.harvard.edu> wrote:
>
>> > Aong those lines, I would like to point out that the device concept
>> > embodied in the kernel's data structures can be pretty thin.  For
>> > example, it might be little more than a port number or bus address.
>
>> Maybe the principle behind drivers/usb/core/usb-acpi.c is helpful
>> for the problem, and DT may refer to ACPI to describe on-board
>> USB devices, and the way to retrieve platform data too.
>
> 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.

> 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?


Thanks,
-- 
Ming Lei
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