K 10
svn:author
V 3
ian
K 8
svn:date
V 27
2017-01-08T02:32:53.313414Z
K 7
svn:log
V 560
Add a new sdhci interface method, get_card_present().

Many embedded SoC controllers that are (more or less) sdhci-compatible don't
implement card detect, and the related values in the PRESENT_STATE register
aren't useful.  A bridge driver can now implement get_card_present() to read
a gpio pin or whatever else is necessary for that system.

The default implementation reads the CARD_PRESENT bit from the PRESENT_STATE
register, so existing drivers will keep working (or keep not-fully-working,
since many drivers right now can't detect card insert/remove).

END