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118 lines
3.1 KiB
118 lines
3.1 KiB
3 years ago
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# SPDX-License-Identifier: GPL-2.0
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/regulator/gpio-regulator.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: GPIO controlled regulators
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maintainers:
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- Liam Girdwood <[email protected]>
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- Mark Brown <[email protected]>
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description:
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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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allOf:
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- $ref: "regulator.yaml#"
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properties:
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compatible:
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const: regulator-gpio
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regulator-name: true
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enable-gpios:
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description: GPIO to use to enable/disable the regulator.
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Warning, the GPIO phandle flags are ignored and the GPIO polarity is
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controlled solely by the presence of "enable-active-high" DT property.
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This is due to compatibility with old DTs.
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maxItems: 1
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gpios:
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description: Array of one or more GPIO pins used to select the regulator
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voltage/current listed in "states".
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minItems: 1
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maxItems: 8 # Should be enough...
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gpios-states:
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description: |
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On operating systems, that don't support reading back gpio values in
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output mode (most notably linux), this array provides the state of GPIO
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pins set when requesting them from the gpio controller. Systems, that are
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capable of preserving state when requesting the lines, are free to ignore
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this property.
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0: LOW
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1: HIGH
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Default is LOW if nothing else is specified.
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$ref: /schemas/types.yaml#/definitions/uint32-array
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maxItems: 8
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items:
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enum: [0, 1]
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default: 0
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states:
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description: Selection of available voltages/currents provided by this
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regulator and matching GPIO configurations to achieve them. If there are
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no states in the "states" array, use a fixed regulator instead.
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$ref: /schemas/types.yaml#/definitions/uint32-matrix
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maxItems: 8
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items:
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items:
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- description: Voltage in microvolts
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- description: GPIO group state value
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startup-delay-us:
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description: startup time in microseconds
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enable-active-high:
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description: Polarity of "enable-gpio" GPIO is active HIGH. Default is
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active LOW.
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type: boolean
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gpio-open-drain:
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description:
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GPIO is open drain type. If this property is missing then default
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assumption is false.
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type: boolean
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regulator-type:
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description: Specifies what is being regulated.
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$ref: /schemas/types.yaml#/definitions/string
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enum:
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- voltage
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- current
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default: voltage
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required:
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- compatible
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- regulator-name
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- gpios
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- states
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unevaluatedProperties: false
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examples:
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- |
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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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...
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