Documentation/devicetree/bindings/regulator/gpio-regulator.txt

   1 GPIO controlled regulators
   2
   3 Required properties:
   4 - compatible            : Must be "regulator-gpio".
   5 - regulator-name        : Defined in regulator.txt as optional, but required
   6                           here.
   7 - gpios                 : Array of one or more GPIO pins used to select the
   8                           regulator voltage/current listed in "states".
   9 - states                : Selection of available voltages/currents provided by
  10                           this regulator and matching GPIO configurations to
  11                           achieve them. If there are no states in the "states"
  12                           array, use a fixed regulator instead.
  13
  14 Optional properties:
  15 - enable-gpios          : GPIO used to enable/disable the regulator.
  16                           Warning, the GPIO phandle flags are ignored and the
  17                           GPIO polarity is controlled solely by the presence
  18                           of "enable-active-high" DT property. This is due to
  19                           compatibility with old DTs.
  20 - enable-active-high    : Polarity of "enable-gpio" GPIO is active HIGH.
  21                           Default is active LOW.
  22 - gpios-states          : On operating systems, that don't support reading back
  23                           gpio values in output mode (most notably linux), this
  24                           array provides the state of GPIO pins set when
  25                           requesting them from the gpio controller. Systems,
  26                           that are capable of preserving state when requesting
  27                           the lines, are free to ignore this property.
  28                           0: LOW, 1: HIGH. Default is LOW if nothing else
  29                           is specified.
  30 - startup-delay-us      : Startup time in microseconds.
  31 - regulator-type        : Specifies what is being regulated, must be either
  32                           "voltage" or "current", defaults to voltage.
  33
  34 Any property defined as part of the core regulator binding defined in
  35 regulator.txt can also be used.
  36
  37 Example:
  38
  39         mmciv: gpio-regulator {
  40                 compatible = "regulator-gpio";
  41
  42                 regulator-name = "mmci-gpio-supply";
  43                 regulator-min-microvolt = <1800000>;
  44                 regulator-max-microvolt = <2600000>;
  45                 regulator-boot-on;
  46
  47                 enable-gpios = <&gpio0 23 0x4>;
  48                 gpios = <&gpio0 24 0x4
  49                          &gpio0 25 0x4>;
  50                 states = <1800000 0x3
  51                           2200000 0x2
  52                           2600000 0x1
  53                           2900000 0x0>;
  54
  55                 startup-delay-us = <100000>;
  56                 enable-active-high;
  57         };