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

[Thierry Reding <thierry.reding@avionic-design.de>]

* Andy Fleming wrote:
> On Tue, Nov 29, 2011 at 1:02 AM, Thierry Reding
> <thierry.reding@avionic-design.de> wrote:
> > * 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?
> 
> I'll happily take a patch. I may wait to apply it, but probably, as
> the merge window is *long* closed, so it won't get pulled into
> mainline until mid-December (I'll apply it to my -next branch).

Okay. I may not get to it until later this week anyway.

Thierry
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