linux/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt
<<
>>
Prefs
   1* Freescale (Enhanced) Configurable Serial Peripheral Interface
   2  (CSPI/eCSPI) for i.MX
   3
   4Required properties:
   5- compatible : Should be "fsl,<soc>-cspi" or "fsl,<soc>-ecspi"
   6- reg : Offset and length of the register set for the device
   7- interrupts : Should contain CSPI/eCSPI interrupt
   8- fsl,spi-num-chipselects : Contains the number of the chipselect
   9- cs-gpios : Specifies the gpio pins to be used for chipselects.
  10
  11Example:
  12
  13ecspi@70010000 {
  14        #address-cells = <1>;
  15        #size-cells = <0>;
  16        compatible = "fsl,imx51-ecspi";
  17        reg = <0x70010000 0x4000>;
  18        interrupts = <36>;
  19        fsl,spi-num-chipselects = <2>;
  20        cs-gpios = <&gpio3 24 0>, /* GPIO3_24 */
  21                   <&gpio3 25 0>; /* GPIO3_25 */
  22};
  23