GPIO controlled regulators
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Required properties:
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- compatible : Must be "regulator-gpio".
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- regulator-name : Defined in regulator.txt as optional, but required
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here.
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- states : Selection of available voltages and GPIO configs.
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if there are no states, then use a fixed regulator
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Optional properties:
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- enable-gpio : GPIO to use to enable/disable the regulator.
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- gpios : GPIO group used to control voltage.
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- gpios-states : gpios pin's initial states array. 0: LOW, 1: HIGH.
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defualt is LOW if nothing is specified.
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- startup-delay-us : Startup time in microseconds.
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- enable-active-high : Polarity of GPIO is active high (default is low).
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- regulator-type : Specifies what is being regulated, must be either
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"voltage" or "current", defaults to voltage.
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- vin-supply : Input supply name.
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Any property defined as part of the core regulator binding defined in
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regulator.txt can also be used.
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Example:
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mmciv: gpio-regulator {
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compatible = "regulator-gpio";
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regulator-name = "mmci-gpio-supply";
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regulator-min-microvolt = <1800000>;
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regulator-max-microvolt = <2600000>;
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regulator-boot-on;
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enable-gpio = <&gpio0 23 0x4>;
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gpios = <&gpio0 24 0x4
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&gpio0 25 0x4>;
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states = <1800000 0x3
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2200000 0x2
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2600000 0x1
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2900000 0x0>;
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startup-delay-us = <100000>;
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enable-active-high;
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vin-supply = <&parent_reg>;
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};
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