linux/Documentation/devicetree/bindings/mmc/mmci.txt
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   1* ARM PrimeCell MultiMedia Card Interface (MMCI) PL180/1
   2
   3The ARM PrimeCell MMCI PL180 and PL181 provides an interface for
   4reading and writing to MultiMedia and SD cards alike.
   5
   6This file documents differences between the core properties described
   7by mmc.txt and the properties used by the mmci driver.
   8
   9Required properties:
  10- compatible             : contains "arm,pl18x", "arm,primecell".
  11- arm,primecell-periphid : contains the PrimeCell Peripheral ID.
  12
  13Optional properties:
  14- mmc-cap-mmc-highspeed  : indicates whether MMC is high speed capable
  15- mmc-cap-sd-highspeed   : indicates whether SD is high speed capable
  16