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

[Chris Ball]

Hi Thomas,

On Wed, Aug 22 2012, Thomas Abraham wrote:
>> This matches Mitch's last suggestion exactly -- I think we're all agreed
>> on these properties now.  The only remaining question is how to handle
>> the pinctrl for CD in Thomas's case.
>
> Hi Chris,
>
> For sdhci-s3c driver, the 'broken-cd' and 'cd-gpios' bindings are
> sufficient. But, are drivers free to use implementation specific
> behavior when using these bindings. Or do we strictly adhere to the
> table which Shawn has listed. For sdhci-s3c driver, I would like to
> deviate from the "implication" column listed above.

I'd rather you use the implications described above for the names
described above; there's not much point in defining named behaviors
across the subsystem if they're actually different in each driver.

But I think you can still use driver-internal properties that change the
interpretation of those names in a documented way.  If the meaning of
cd-gpios is modified when coupled with your "samsung,sdhci-cd-external",
that's okay with me.  That should cover all the cases you need until you
migrate to using pinctrl, right?  So, you could immediately support:

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?

Thanks,

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