[PATCH RFC 1/3] DT: bindings: mmc: Add property for 3.3V only support

[Rob Herring]

On Sat, Aug 06, 2016 at 12:55:38PM +0000, Stefan Wahren wrote:
> Currently there is no proper way to define that a MMC host supports
> only 3.3V. The property no-1-8-v is broken and has different meanings
> for different sdhci variants. So add a new property for 3.3V only
> support and mark no-1-8-v as deprecated.

Why is it broken? How would I override a controller saying 1.8V is 
supported and it is not?

Rob