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

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Date:	Wed, 2 Jan 2008 13:58:56 -0500
From:	"Mike Frysinger" <vapier.adi@...il.com>
To:	"David Brownell" <david-b@...bell.net>
Cc:	linux-usb-devel@...ts.sourceforge.net,
	"Robin Getz" <rgetz@...ckfin.uclinux.org>, gregkh@...e.de,
	linux-kernel@...r.kernel.org
Subject: Re: [linux-usb-devel] [PATCH] : Allow embedded developers USB options normally reserved for OTG

On Jan 2, 2008 1:47 PM, David Brownell <david-b@...bell.net> wrote:
> On Wednesday 02 January 2008, Robin Getz wrote:
> > From: Robin Getz <rgetz@...ckfin.uclinux.org>
> >
> > Allow embedded developers to turn support for USB Hubs off even if they have a
> > full root hub. This saves the overhead (RAM and Flash size).
>
> ISTR that it won't save very much code though ... the Linux USB
> stack structures all its enumeration logic around hubs.

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.)
-mike
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