[U-Boot] [PATCH 2/6] sunxi: Add mmc card-detect functionality

[Ian Campbell <ijc@hellion.org.uk>]

On Fri, 2014-10-03 at 17:05 +0200, Hans de Goede wrote:
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> ---
>  board/sunxi/Kconfig     | 27 +++++++++++++++++++++++++++
>  drivers/mmc/sunxi_mmc.c | 20 ++++++++++++++++++++
>  2 files changed, 47 insertions(+)
> 
> diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig
> index 622f7b4..72d6dfa 100644
> --- a/board/sunxi/Kconfig
> +++ b/board/sunxi/Kconfig
> @@ -32,4 +32,31 @@ config USB_KEYBOARD
>  	Say Y here to add support for using a USB keyboard (typically used
>  	in combination with a graphical console on HDMI).
>  
> +config MMC0_CD_PIN
> +	int "Card detect pin for mmc0"
> +	default -1
> +	---help---
> +	Set the card detect pin for mmc0, set to -1 to not use cd. The pins
> +	are numbered as follows PA0 - PA17 are pin number 0 - 17, PB0 - PB23
> +	are 32 - 55, PC0 - PC24 are 64 - 88, etc. Most boards use PH1 for
> +	mmc0 cd, which is pin nr 225.

Is there any way we could use the same trick as for SATAPWR and allow
this to be specified as something like GPx(y) instead of requiring this
complex mapping in the help text? Might be possible with some
combination of Kconfig and cpp trickery?

Maybe the simplest solution is to make this a string and pass it to
name_to_gpio at runtime (e.g gpio = name_to_gpio(CONFIG_MMC0_CD_PIN)),
although that has the disadvantage of being runtime only check.

Ian.