linux-kernel - Re: [PATCH] usb: add Freescale QE/CPM USB peripheral controller driver

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Message-ID: <Pine.LNX.4.44L0.0808281320010.2464-100000@iolanthe.rowland.org>
Date:	Thu, 28 Aug 2008 13:22:38 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Arnd Bergmann <arnd@...db.de>
cc:	linuxppc-dev@...abs.org, Li Yang <leoli@...escale.com>,
	<greg@...ah.com>, <linux-usb@...r.kernel.org>,
	<dbrownell@...rs.sourceforge.net>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: add Freescale QE/CPM USB peripheral controller
 driver

On Thu, 28 Aug 2008, Arnd Bergmann wrote:

> Not addressing this driver in particular, but the USB gadget layer in
> general: This is a horrible interface, since every gadget driver exports
> the same symbols, you can never build a kernel that includes more than
> one gadget driver. Even if the drivers are all built as modules, simply
> loading one of them prevents loading another one.

This was done deliberately.  The relevant standards state that a USB
device can have no more than one peripheral interface.

Now, I don't claim to fully support this decision.  But there is a 
reason behind it; it's not just a case of bad design.

Alan Stern

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