linux-kernel - Re: [PATCH, RFC 16/22] USB: UHCI: clarify Kconfig dependencies

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Message-ID: <Pine.LNX.4.44L0.1305021423450.1436-100000@iolanthe.rowland.org>
Date:	Thu, 2 May 2013 14:27:55 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Arnd Bergmann <arnd@...db.de>
cc:	linux-kernel@...r.kernel.org,
	<linux-arm-kernel@...ts.infradead.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH, RFC 16/22] USB: UHCI: clarify Kconfig dependencies

On Thu, 2 May 2013, Arnd Bergmann wrote:

> > What do you think of my patch as compared to yours? 
> 
> I think in the end it comes down to the question where you want to
> head with your driver. The way I did my version was going towards
> making it similar to EHCI, with stand-alone bus glue drivers
> and a core that is just a library module but does not register
> a device_driver by itself.
> 
> Given that there are just three bus glues from UHCI, and at most
> two of them enabled at the same time, I don't see a direct need
> for UHCI to go down the same route as EHCI. If you want to just
> leave this driver alone, your patch is simpler and has the same
> effect in the end. Otherwise I think my patch avoids changing it
> all again once the driver gets reworked.

Okay then, I'll submit my patch to Greg after the merge window closes.

> Things might also get a little messy if we are seeing a lot
> of other platforms beside VIA VT8500 use UHCI, but I think that
> is rather unlikely.

Indeed.  UHCI is the oldest of the host controller standards; people
aren't about to start creating a whole bunch of new implementations of 
it.  Even Intel no longer uses UHCI on their more recent motherboards.

Alan Stern

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