58 lines
2.0 KiB
Plaintext
58 lines
2.0 KiB
Plaintext
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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- gpios : Array of one or more GPIO pins used to select the
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regulator voltage/current listed in "states".
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- states : Selection of available voltages/currents provided by
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this regulator and matching GPIO configurations to
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achieve them. If there are no states in the "states"
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array, use a fixed regulator instead.
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Optional properties:
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- enable-gpios : GPIO used to enable/disable the regulator.
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Warning, the GPIO phandle flags are ignored and the
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GPIO polarity is controlled solely by the presence
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of "enable-active-high" DT property. This is due to
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compatibility with old DTs.
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- enable-active-high : Polarity of "enable-gpio" GPIO is active HIGH.
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Default is active LOW.
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- gpios-states : On operating systems, that don't support reading back
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gpio values in output mode (most notably linux), this
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array provides the state of GPIO pins set when
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requesting them from the gpio controller. Systems,
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that are capable of preserving state when requesting
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the lines, are free to ignore this property.
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0: LOW, 1: HIGH. Default is LOW if nothing else
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is specified.
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- startup-delay-us : Startup time in microseconds.
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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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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-gpios = <&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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};
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