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

[Hans de Goede <hdegoede@redhat.com>]

Hi,

On 10/04/2014 10:30 AM, Ian Campbell wrote:
> 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.

I agree that being able to use symbolic names is much better, but I
could not find a Kconfig / cpp trickery way to do this. I think that
using name_to_gpio is a good solution for this, so that is what I'll
do for v2.

Regards,

Hans