linux/Documentation/devicetree/bindings/spi/mxs-spi.txt
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   1* Freescale MX233/MX28 SSP/SPI
   2
   3Required properties:
   4- compatible: Should be "fsl,<soc>-spi", where soc is "imx23" or "imx28"
   5- reg: Offset and length of the register set for the device
   6- interrupts: Should contain SSP ERROR interrupt
   7- dmas: DMA specifier, consisting of a phandle to DMA controller node
   8  and SSP DMA channel ID.
   9  Refer to dma.txt and fsl-mxs-dma.txt for details.
  10- dma-names: Must be "rx-tx".
  11
  12Optional properties:
  13- clock-frequency : Input clock frequency to the SPI block in Hz.
  14                    Default is 160000000 Hz.
  15
  16Example:
  17
  18ssp0: ssp@80010000 {
  19        #address-cells = <1>;
  20        #size-cells = <0>;
  21        compatible = "fsl,imx28-spi";
  22        reg = <0x80010000 0x2000>;
  23        interrupts = <96>;
  24        dmas = <&dma_apbh 0>;
  25        dma-names = "rx-tx";
  26};
  27