linux-kernel - Re: [PATCH 02/10] mach-u300: rewrite gpio driver, move to drivers/gpio

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Message-ID: <alpine.LFD.2.00.1105191527440.14430@xanadu.home>
Date:	Thu, 19 May 2011 15:30:36 -0400 (EDT)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Sascha Hauer <s.hauer@...gutronix.de>
cc:	Shawn Guo <shawn.guo@...escale.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Jonas Aaberg <jonas.aberg@...ricsson.com>,
	linux-kernel@...r.kernel.org,
	Grant Likely <grant.likely@...retlab.ca>,
	Lee Jones <lee.jones@...aro.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 02/10] mach-u300: rewrite gpio driver, move to
 drivers/gpio

On Thu, 19 May 2011, Sascha Hauer wrote:

> On Thu, May 19, 2011 at 09:56:32PM +0800, Shawn Guo wrote:
> > On Thu, May 19, 2011 at 02:21:27PM +0200, Linus Walleij wrote:
> > > On Thu, May 19, 2011 at 10:56 AM, Shawn Guo <shawn.guo@...escale.com> wrote:
> > > 
> > > > I start working on moving mxs gpio (arch/arm/mach-mxs/gpio.c) into
> > > > driver/gpio, and I see the possibility to go a different approach
> > > > from U300 one posted here.
> > > 
> > > I've tried to figure out what relation the mail has to the U300 driver
> > > but cannot find any, more than that it's moving a driver... Please
> > > start a new mail thread.
> > > 
> > I will post mxs-gpio driver once I get it done.  Then please review
> > the code and see the difference between mxs-gpio and u300-gpio,
> > though these hardwares have something in common.
> 
> I'm pretty sure they have something in common and even more that *all*
> gpio drivers have something in common. I wonder if it really makes sense
> to move the gpio driver to drivers/gpio without creating a common
> mmio_gpio_chip beforehand. This can't be very hard.

I do think that performing the move first will make a subsequent 
conversion easier.  And since a move is a no-op from a functional point 
of view, it is the safest thing to do first.


Nicolas
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