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

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Message-ID: <20110520031818.GB27251@S2100-06.ap.freescale.net>
Date:	Fri, 20 May 2011 11:18:18 +0800
From:	Shawn Guo <shawn.guo@...escale.com>
To:	Nicolas Pitre <nicolas.pitre@...aro.org>
CC:	Sascha Hauer <s.hauer@...gutronix.de>,
	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, May 19, 2011 at 03:30:36PM -0400, Nicolas Pitre wrote:
> 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.
> 
That's also what I heard on UDS week.  Move stuff into driver/gpio
first, then try to find the pattern in those drivers and come up with
some framework.

-- 
Regards,
Shawn

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