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 09:35:16 +0800
From:	Shawn Guo <shawn.guo@...escale.com>
To:	Olof Johansson <olof@...om.net>
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 Olof,

Thanks for the review.

On Mon, May 30, 2011 at 05:53:15PM -0700, Olof Johansson wrote:
> Hi,
> 
> 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>
> > ---
> >  arch/arm/plat-mxc/include/mach/gpio.h |    2 +
> >  drivers/gpio/Makefile                 |    1 +
> >  drivers/gpio/gpio-mxc.c               |  423 +++++++++++++++++++++++++++++++++
> >  3 files changed, 426 insertions(+), 0 deletions(-)
> >  create mode 100644 drivers/gpio/gpio-mxc.c
> > 
> > diff --git a/arch/arm/plat-mxc/include/mach/gpio.h b/arch/arm/plat-mxc/include/mach/gpio.h
> > index a2747f1..87bd4ef 100644
> > --- a/arch/arm/plat-mxc/include/mach/gpio.h
> > +++ b/arch/arm/plat-mxc/include/mach/gpio.h
> > @@ -37,7 +37,9 @@
> >  #define irq_to_gpio(irq)	((irq) - MXC_GPIO_IRQ_START)
> >  
> >  struct mxc_gpio_port {
> > +	struct list_head node;
> >  	void __iomem *base;
> > +	int id;
> 
> What's id for? You assign it based on pdev->id in the probe function but
> never use it anywhere else.
> 
Yes, it is only used in probe function right now, and can be removed.
I feel it will be needed someday when more cleanup and consolidation
works happen, but we can add it back then.  So, yes, I will remove it
for now.

-- 
Regards,
Shawn

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