[U-Boot] [PATCH] mmc: Implement card detection.

[Thierry Reding]

* Andy Fleming wrote:
[...]
> Well, while this isn't the case in any systems I know of now, it is
> quite possible for there to be more than one *type* of SD/MMC
> controller on an SoC, and there's always the possibility that an SoC
> provides a non-controller-specific card-detect mechanism. The idea is
> that, lacking a board-specific card-detect mechanism, the SoC might be
> able to direct the query to the right place.
> 
> But I'm talking very theoretically, here. I wouldn't object to a
> mechanism that was just:
> 
> cd = board_mmc_getcd(mmc);
> 
> if (cd < 0 && mmc->getcd)
>    cd = mmc->getcd(mmc);
> 
> If we ever ran into a case where an SoC had better knowledge than the
> driver, then it's easy to fix the code.

That makes sense. The code can always be extended when new hardware requires
it. No need to over-engineer at this point.

Do you want me to prepare a patch or should we rather wait for some more
input from others?

Thierry
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