linux-kernel - Re: [PATCH 1/4] gpio: gpio-mxc: add gpio driver for Freescale MXC architecture

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Date:	Tue, 31 May 2011 17:16:42 +0800
From:	Shawn Guo <shawn.guo@...escale.com>
To:	Jamie Iles <jamie@...ieiles.com>
CC:	Shawn Guo <shawn.guo@...aro.org>, <linux-kernel@...r.kernel.org>,
	<grant.likely@...retlab.ca>, <arnd@...db.de>,
	<kernel@...gutronix.de>, <linux-arm-kernel@...ts.infradead.org>,
	<patches@...aro.org>
Subject: Re: [PATCH 1/4] gpio: gpio-mxc: add gpio driver for Freescale MXC
 architecture

Hi Jamie,

On Tue, May 31, 2011 at 09:44:24AM +0100, Jamie Iles wrote:
> Hi Shawn,
> 
> On Mon, May 30, 2011 at 10:52:16PM +0800, Shawn Guo wrote:
> > Add gpio-mxc driver by copying arch/arm/plat-mxc/gpio.c into
> > drivers/gpio with the following changes.
> > 
> >  * Use readl/writel to replace mach-specific accessors
> >    __raw_readl/__raw_writel
> > 
> >  * Migrate to platform driver by adding .probe function
> > 
> >  * Add a list to save all mx2 ports references, so that
> >    mx2_gpio_irq_handler can walk through all interrupt status
> >    registers
> > 
> > Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
> > ---
> 
> Could you use the stuff in drivers/gpio/basic_mmio_gpio.c for 
> implementing the gpio_chip?  I had a go a little while ago [1] but since 
> then we've made it possible to embed the bgpio_chip in your own 
> structure which may be cleaner.
> 
> Jamie
> 
> 1. http://permalink.gmane.org/gmane.linux.ports.arm.kernel/113139
> --

I would like to keep this series as simple as it is, straight moving
plat-mxc/gpio into drivers/gpio, and then start looking at the
possible consolidation, like generic_irq_chip and basic_mmio_gpio you
offered here.  Thanks for the patch.  I will start with it shortly. 

-- 
Regards,
Shawn

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