Documentation/devicetree/bindings/mmc/mmc-spi-slot.txt

   1 MMC/SD/SDIO slot directly connected to a SPI bus
   2
   3 Required properties:
   4 - compatible : should be "mmc-spi-slot".
   5 - reg : should specify SPI address (chip-select number).
   6 - spi-max-frequency : maximum frequency for this device (Hz).
   7 - voltage-ranges : two cells are required, first cell specifies minimum
   8   slot voltage (mV), second cell specifies maximum slot voltage (mV).
   9   Several ranges could be specified.
  10
  11 Optional properties:
  12 - gpios : may specify GPIOs in this order: Card-Detect GPIO,
  13   Write-Protect GPIO.
  14 - interrupts : the interrupt of a card detect interrupt.
  15 - interrupt-parent : the phandle for the interrupt controller that
  16   services interrupts for this device.
  17
  18 Example:
  19
  20         mmc-slot@0 {
  21                 compatible = "fsl,mpc8323rdb-mmc-slot",
  22                              "mmc-spi-slot";
  23                 reg = <0>;
  24                 gpios = <&qe_pio_d 14 1
  25                          &qe_pio_d 15 0>;
  26                 voltage-ranges = <3300 3300>;
  27                 spi-max-frequency = <50000000>;
  28                 interrupts = <42>;
  29                 interrupt-parent = <&PIC>;
  30         };