[PATCH] mmc: dt: Add 'broken-cd' DT binding

[Chris Ball]

Hi Thomas,

On Wed, Aug 22 2012, Thomas Abraham wrote:
>> none          -> currently "samsung,sdhci-cd-internal"
>> broken-cd     -> currently "samsung,sdhci-cd-none"
>> cd-gpios      -> currently "samsung,sdhci-cd-gpios"
>> non-removable -> currently "samsung,sdhci-cd-permanent"
>> cd-gpios + samsung,sdhci-cd-external -> currently "samsung,sdhci-cd-external"
>>
>> How does that sound?
>
> Not quite there yet. It is not possible to leave out cd-gpios for
> "samsung,sdhci-cd-internal" since the current Samsung pinmux
> configuration piggybacks on gpio dt binding. Can we use the following
> instead.
>
> none               -> currently "samsung,sdhci-cd-none"
> broken-cd        -> currently "samsung,sdhci-cd-none"
> cd-gpios          -> currently "samsung,sdhci-cd-gpios"
> non-removable -> currently "samsung,sdhci-cd-permanent"
> cd-gpios + samsung,sdhci-cd-internal -> currently "samsung,sdhci-cd-internal"

I see.  Okay; unless anyone has better ideas, it sounds like you should
go ahead and do that -- with something like this in your binding docs:

"This binding differs from the core MMC binding by requiring a cd-gpios
property to be present to use internal card-detection.  If no cd-gpios
are present (and "non-removable" is missing) the driver will poll for
card-detection as if a "broken-cd" property was provided."

I'll send out the new core bindings doc shortly.  Finishing off another
thread -- the "samsung-sdhci.txt" name is okay.

Thanks,

- Chris.
-- 
Chris Ball   <cjb at laptop.org>   <http://printf.net/>
One Laptop Per Child