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 Interpreted by the OF core:
   6 - reg: Registers location and length.
   7 - interrupts: Interrupts used by the MMC controller.
   8
   9 Required properties:
  10 - bus-width: Number of data lines, can be <1>, <4>, or <8>
  11
  12 Optional properties:
  13 - cd-gpios: Specify GPIOs for card detection, see gpio binding
  14 - wp-gpios: Specify GPIOs for write protection, see gpio binding
  15 - cd-inverted: when present, polarity on the cd gpio line is inverted
  16 - wp-inverted: when present, polarity on the wp gpio line is inverted
  17 - non-removable: non-removable slot (like eMMC)
  18 - max-frequency: maximum operating clock frequency
  19
  20 Example:
  21
  22 sdhci@ab000000 {
  23         compatible = "sdhci";
  24         reg = <0xab000000 0x200>;
  25         interrupts = <23>;
  26         bus-width = <4>;
  27         cd-gpios = <&gpio 69 0>;
  28         cd-inverted;
  29         wp-gpios = <&gpio 70 0>;
  30         max-frequency = <50000000>;
  31 }