linux/Documentation/devicetree/bindings/spi/spi_atmel.txt
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   1Atmel SPI device
   2
   3Required properties:
   4- compatible : should be "atmel,at91rm9200-spi".
   5- reg: Address and length of the register set for the device
   6- interrupts: Should contain spi interrupt
   7- cs-gpios: chipselects
   8
   9Example:
  10
  11spi1: spi@fffcc000 {
  12        compatible = "atmel,at91rm9200-spi";
  13        reg = <0xfffcc000 0x4000>;
  14        interrupts = <13 4 5>;
  15        #address-cells = <1>;
  16        #size-cells = <0>;
  17        cs-gpios = <&pioB 3 0>;
  18        status = "okay";
  19
  20        mmc-slot@0 {
  21                compatible = "mmc-spi-slot";
  22                reg = <0>;
  23                gpios = <&pioC 4 0>;    /* CD */
  24                spi-max-frequency = <25000000>;
  25        };
  26};
  27