Documentation/devicetree/bindings/mmc/mmc.txt

   1 These properties are common to multiple MMC host controllers. Any host
   2 that requires the respective functionality should implement them using
   3 these definitions.
   4
   5 Required properties:
   6 - bus-width: Number of data lines, can be <1>, <4>, or <8>
   7
   8 Optional properties:
   9 - cd-gpios : Specify GPIOs for card detection, see gpio binding
  10 - wp-gpios : Specify GPIOs for write protection, see gpio binding
  11 - cd-inverted: when present, polarity on the wp gpio line is inverted
  12 - wp-inverted: when present, polarity on the wp gpio line is inverted
  13 - non-removable: non-removable slot (like eMMC)
  14 - max-frequency: maximum operating clock frequency
  15
  16 Example:
  17
  18 sdhci@ab000000 {
  19         compatible = "sdhci";
  20         reg = <0xab000000 0x200>;
  21         interrupts = <23>;
  22         bus-width = <4>;
  23         cd-gpios = <&gpio 69 0>;
  24         cd-inverted;
  25         wp-gpios = <&gpio 70 0>;
  26         max-frequency = <50000000>;
  27 }