linux-kernel - Re: [linux-usb-devel] [PATCH] : Allow embedded developers USB options normally reserved for OTG

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Message-ID: <Pine.LNX.4.44L0.0801021444290.2990-100000@iolanthe.rowland.org>
Date:	Wed, 2 Jan 2008 14:46:56 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Mike Frysinger <vapier.adi@...il.com>
cc:	David Brownell <david-b@...bell.net>, <gregkh@...e.de>,
	<linux-usb-devel@...ts.sourceforge.net>,
	Robin Getz <rgetz@...ckfin.uclinux.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [linux-usb-devel] [PATCH] : Allow embedded developers USB options
 normally reserved for OTG

On Wed, 2 Jan 2008, Mike Frysinger wrote:

> perhaps the code size is arguable as to whether it really matters.
> the reason we want it is that we have a USB host controller that will
> not work with USB hubs, so we want to make sure the system does not
> attempt such things.  (yes, such a USB host controller is retarded,
> but the decision was out of our hands.)

Just out of curiosity, how does a host controller manage to avoid
working with external hubs?  Is it a matter of power consumption?  It
seems to me that in all other respects a hub should appear the same as
any other USB device.

Or is it a question of whether the controller works when communicating 
with devices behind an external hub?  And if it is, what is the 
difficulty?

Alan Stern

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