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

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Message-ID: <20130814184916.GM2401@sirena.org.uk>
Date:	Wed, 14 Aug 2013 19:49:16 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Stephen Warren <swarren@...dotorg.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>,
	Ian Campbell <ian.campbell@...rix.com>,
	Felipe Balbi <balbi@...com>,
	Grant Likely <grant.likely@...aro.org>,
	devicetree@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Non-enumerable devices on USB and other enumerable buses

On Wed, Aug 14, 2013 at 10:30:44AM -0600, Stephen Warren wrote:
> On 08/14/2013 10:14 AM, Alan Stern wrote:

> > No, no -- this is exactly the point I was trying to make.  The on-board
> > hub _won't_ appear on the USB bus until the GPIOs are set.  Therefore
> > the callback to set the GPIOs needs to be at a different place, not
> > when the device appears.

> The device Mark was talking about is the controller end of the bus (EHCI
> controller, or hub's downstream port) not the device end of the bus (any
> USB device's upstream port).

Actually it genuinely is a hub - it's not part of the controller, though
the startup does need to be synchronised with the controller.  It ends
up parenting some other devices but that's not suchan issue.

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