linux-kernel - Re: gpio-ucb1400

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Date:	Sat, 30 Mar 2013 20:20:44 +0100
From:	Marek Vasut <marek.vasut@...il.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Jean Delvare <jdelvare@...e.de>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: gpio-ucb1400

Dear Guenter Roeck,

> On Fri, Mar 29, 2013 at 08:46:39PM +0100, Jean Delvare wrote:
> > Hi all,
> > 
> > In September 2009, a driver for the GPIO function of the UCB1400 chip
> > was added to the kernel tree. The probe function of this driver requires
> > ucbdata to be set. The only place where this happens is in function
> > ucb1400_gpio_set_data(). This function was never call, and still isn't.
> > So this is dead code for 3.5 years as far as the upstream kernel is
> > concerned.
> > 
> > To make things worse, this driver can't be built as a module, for no
> > good reason that I can see.
> > 
> > Marek, can you explain what was the point of submitting this driver that
> > nobody can use?
> > 
> > I would like either this driver to be fixed so that it can be used (and
> > that would IMHO start with dropping the ugly ucb1400_gpio_set_data hook
> > and global variable ucbdata), or this driver to be dropped from the
> > kernel tree. If the driver is kept, it should be adjusted so that it can
> > be built as a module.
> > 
> > If I overlooked something, please let me know.
> 
> Interestingly, the author made an attempt to fix that with [1]. It looks
> like the rest of that series was merged, but this patch wasn't, though I
> don't find any information about the reason.

It's been a while. Guenter, thanks for finding that link, but I suspect the 
patch is heavily obsolete by now.

Best regards,
Marek Vasut
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