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

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Message-ID: <20130812144110.GA6427@sirena.org.uk>
Date:	Mon, 12 Aug 2013 15:41:10 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Grant Likely <grant.likely@...aro.org>
Cc:	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>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devicetree@...nel.org, Linux USB list <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 Sun, Aug 11, 2013 at 11:08:37PM +0100, Grant Likely wrote:

> full enumerating like that with either ACPI or FDT, but we could allow
> for sparse population of devices when something is fixed like a
> soldered down USB hub or USB Ethernet MAC.

I agree, there's no point in listing things that can be done
automatically - it's just introducing potential for error.

> To make it work would probably require a hook in the USB enumeration
> path to look for matching nodes in DT/ACPI and attach it to the struct
> device.

Yes, that was where I was heading too.  Have a mechanism for matching up
hotplugged devices with pre-registered ones which appear from firmware
or wherever if their IDs match.  It'd need some mechanism for drivers to
opt into being bound to devices that aren't physically there I think so
that normal drivers for enumerated devices don't get confused.

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