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 - gpios : (optional) may specify GPIOs in this order: Card-Detect GPIO,
  11   Write-Protect GPIO.
  12
  13 Example:
  14
  15         mmc-slot@0 {
  16                 compatible = "fsl,mpc8323rdb-mmc-slot",
  17                              "mmc-spi-slot";
  18                 reg = <0>;
  19                 gpios = <&qe_pio_d 14 1
  20                          &qe_pio_d 15 0>;
  21                 voltage-ranges = <3300 3300>;
  22                 spi-max-frequency = <50000000>;
  23         };