[PATCH/RFC] mmc: add DT bindings for more MMC capability flags

[Arnd Bergmann]

On Wednesday 06 February 2013 17:25:42 Guennadi Liakhovetski wrote:
> 
> Thank for pointing me out at that thread. However, I don't think 
> MMC_CAP_POWER_OFF_CARD has anything to do with compatibility or hardware 
> revisions. At least I haven't yet come across any sd/mmc hosts, that also 
> supply card power. You could "derive" this flag from the presence of a 
> regulator, capable of changing its status (switching on / off), but even 
> then you're not guaranteed, that you actually can (and want to) power the 
> card off at run-time - the regulator can be shared etc. So, an explicit 
> flag is needed.

It sounds like something that should be handled in a controller specific
way I think. E.g. on SDHCI, there seems to always be a method to power
down the card using the SDHCI_POWER_CONTROL register, even without
any external regulators.

	Arnd