linux-kernel - Re: gpio-ucb1400

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Date:	Tue, 02 Apr 2013 09:22:37 +0200
From:	Jean Delvare <jdelvare@...e.de>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Marek Vasut <marek.vasut@...il.com>,
	Guenter Roeck <linux@...ck-us.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: gpio-ucb1400

Le lundi 01 avril 2013 à 16:32 +0100, Mark Brown a écrit :
> On Mon, Apr 01, 2013 at 01:06:43PM +0200, Jean Delvare wrote:
> 
> > My point was, the upstream gpio-ucb1400 driver in its current form is
> > unusable (on top of being ugly.) I have no doubt that someone used that
> > driver successfully in some external kernel tree, but the code that was
> > merged upstream is incomplete and no good.
> 
> What the driver is doing is, unfortunately, the best practice for an
> AC'97 connected device like this - we've got an uncomfortable mix of
> an enumerable bus and platform data combined with a subsystem which has
> never had enough love to work in a nice way with the kernel.  The idea
> is that any boards which have the device will call the _set_data()
> function in their board-specific code.

OK but where are these users? I can't see any in the upstream kernel.

> Sadly we're a little short on volunteers to clean up the AC'97
> subsystem so this situation shows little sign of improving.

Well Marek proposed a cleanup which looked good [1], several times
apparently, but it was never applied.

[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2010-October/028656.html

-- 
Jean Delvare
Suse L3

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