On Mon, Oct 28, 2013 at 10:10:04PM +1100, NeilBrown wrote: > I agree that this power-up sequence should be a property of the device. > However until the device has been powered up, Linux doesn't know about it. > Neither a board file or a devicetree can (as far as I can tell), tell the > MMC port that a particular card is attached. Rather the host probes the card > to see what it is. > So there isn't any way for the device driver to get control at the > appropriate time to effect the proper sequencing.
If it is a genuinely pluggable MMC slot then I'd expect the sequence to be implementing whatever is required for standard MMC enumeration to work. If the device is a soldered down one with extra control (as is quite common) then there shouldn't be a problem describing it?
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