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

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Message-ID: <CACxGe6sM8_d_omiQU=4qA207dnYMGDELN0KDbhYDsWDg7RKAKQ@mail.gmail.com>
Date:	Sun, 11 Aug 2013 23:08:37 +0100
From:	Grant Likely <grant.likely@...aro.org>
To:	Mark Brown <broonie@...nel.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 8:08 PM, Mark Brown <broonie@...nel.org> wrote:
> I know there's been some discussion of this topic but do we have any
> general consensus on how to handle such things both from a Linux driver
> model point of view and from a DT/ACPI point of view?

There is precedence for describing enumerated device in the device
tree. Real OpenFirmware platforms can and will enumerate the PCI and
USB busses and pass a full tree to the OS. I don't think we want to
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.

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.

g.
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