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

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Date:	Mon, 30 May 2011 17:53:15 -0700
From:	Olof Johansson <olof@...om.net>
To:	Shawn Guo <shawn.guo@...aro.org>
Cc:	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,

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.


-Olof
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