kernel/Documentation/devicetree/bindings/spi/spi-gpio.txt

   1 SPI-GPIO devicetree bindings
   2
   3 Required properties:
   4
   5  - compatible: should be set to "spi-gpio"
   6  - #address-cells: should be set to <0x1>
   7  - ranges
   8  - gpio-sck: GPIO spec for the SCK line to use
   9  - gpio-miso: GPIO spec for the MISO line to use
  10  - gpio-mosi: GPIO spec for the MOSI line to use
  11  - cs-gpios: GPIOs to use for chipselect lines.
  12              Not needed if num-chipselects = <0>.
  13  - num-chipselects: Number of chipselect lines. Should be <0> if a single device
  14                     with no chip select is connected.
  15
  16 Example:
  17
  18         spi {
  19                 compatible = "spi-gpio";
  20                 #address-cells = <0x1>;
  21                 ranges;
  22
  23                 gpio-sck = <&gpio 95 0>;
  24                 gpio-miso = <&gpio 98 0>;
  25                 gpio-mosi = <&gpio 97 0>;
  26                 cs-gpios = <&gpio 125 0>;
  27                 num-chipselects = <1>;
  28
  29                 /* clients */
  30         };
  31