linux/Documentation/devicetree/bindings/mmc/mmc-spi-slot.txt
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   1MMC/SD/SDIO slot directly connected to a SPI bus
   2
   3This file documents differences between the core properties described
   4by mmc.txt and the properties used by the mmc_spi driver.
   5
   6Required properties:
   7- spi-max-frequency : maximum frequency for this device (Hz).
   8- voltage-ranges : two cells are required, first cell specifies minimum
   9  slot voltage (mV), second cell specifies maximum slot voltage (mV).
  10  Several ranges could be specified.
  11
  12Optional properties:
  13- gpios : may specify GPIOs in this order: Card-Detect GPIO,
  14  Write-Protect GPIO. Note that this does not follow the
  15  binding from mmc.txt, for historical reasons.
  16- interrupt-parent : the phandle for the interrupt controller that
  17  services interrupts for this device.
  18
  19Example:
  20
  21        mmc-slot@0 {
  22                compatible = "fsl,mpc8323rdb-mmc-slot",
  23                             "mmc-spi-slot";
  24                reg = <0>;
  25                gpios = <&qe_pio_d 14 1
  26                         &qe_pio_d 15 0>;
  27                voltage-ranges = <3300 3300>;
  28                spi-max-frequency = <50000000>;
  29                interrupts = <42>;
  30                interrupt-parent = <&PIC>;
  31        };
  32