linux/Documentation/devicetree/bindings/w1/w1-gpio.txt
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   1w1-gpio devicetree bindings
   2
   3Required properties:
   4
   5 - compatible: "w1-gpio"
   6 - gpios: one or two GPIO specs:
   7                - the first one is used as data I/O pin
   8                - the second one is optional. If specified, it is used as
   9                  enable pin for an external pin pullup.
  10
  11Optional properties:
  12
  13 - linux,open-drain: if specified, the data pin is considered in
  14                     open-drain mode.
  15
  16Examples:
  17
  18        onewire@0 {
  19                compatible = "w1-gpio";
  20                gpios = <&gpio 126 0>, <&gpio 105 0>;
  21        };
  22
  23