[RFC] Add Generic GPIO driver

[Sascha Hauer]

Hi Alexander,

On Fri, Feb 15, 2013 at 10:49:27PM +0400, Alexander Shiyan wrote:
> This patch adds generic memory-mapped GPIO controller support.
> Code taken from Linux Kernel and adopted for barebox.

I'm fine with this if you add a user for it. I wonder though if it's
worth it to have this driver for barebox. If I have a driver in the
kernel that already uses it, then this makes it simple to copy it, but
should I have to write a new gpio driver, I'm unsure if it's simpler
to write a new gpio driver or to register with the generic gpio
driver.

> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 89be684..565f5bd 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -6,10 +6,20 @@ if GPIOLIB
>  
>  menu "GPIO"
>  
> +config GPIO_GENERIC
> +	def_bool y
> +

Please do not unconditionally enable this for all configs.

Sascha

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