linux/Documentation/devicetree/bindings/regulator/fixed-regulator.txt
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   1Fixed Voltage regulators
   2
   3Required properties:
   4- compatible: Must be "regulator-fixed";
   5
   6Optional properties:
   7- gpio: gpio to use for enable control
   8- startup-delay-us: startup time in microseconds
   9- enable-active-high: Polarity of GPIO is Active high
  10If this property is missing, the default assumed is Active low.
  11- gpio-open-drain: GPIO is open drain type.
  12  If this property is missing then default assumption is false.
  13-vin-supply: Input supply name.
  14
  15Any property defined as part of the core regulator
  16binding, defined in regulator.txt, can also be used.
  17However a fixed voltage regulator is expected to have the
  18regulator-min-microvolt and regulator-max-microvolt
  19to be the same.
  20
  21Example:
  22
  23        abc: fixedregulator@0 {
  24                compatible = "regulator-fixed";
  25                regulator-name = "fixed-supply";
  26                regulator-min-microvolt = <1800000>;
  27                regulator-max-microvolt = <1800000>;
  28                gpio = <&gpio1 16 0>;
  29                startup-delay-us = <70000>;
  30                enable-active-high;
  31                regulator-boot-on;
  32                gpio-open-drain;
  33                vin-supply = <&parent_reg>;
  34        };
  35