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The description of "regulator-boot-on" was a little unclear, at least to me. Did this property mean that we should turn the regulator on at boot? Or perhaps it was intended only to be used for regulators where we couldn't read the state at bootup to indicate what state we should assume? The answer, it turns out, is both [1]. Let's document this. [1] https://lore.kernel.org/r/20190923181431.GU2036@sirena.org.uk Signed-off-by: Douglas Anderson <dianders@chromium.org> Link: https://lore.kernel.org/r/20191001124531.v2.1.Ice34ad5970a375c3c03cb15c3859b3ee501561bf@changeid Signed-off-by: Mark Brown <broonie@kernel.org>
206 lines
7.3 KiB
YAML
206 lines
7.3 KiB
YAML
# SPDX-License-Identifier: GPL-2.0
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/regulator/regulator.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Voltage/Current Regulators
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maintainers:
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- Liam Girdwood <lgirdwood@gmail.com>
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- Mark Brown <broonie@kernel.org>
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properties:
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regulator-name:
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description: A string used as a descriptive name for regulator outputs
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$ref: "/schemas/types.yaml#/definitions/string"
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regulator-min-microvolt:
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description: smallest voltage consumers may set
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regulator-max-microvolt:
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description: largest voltage consumers may set
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regulator-microvolt-offset:
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description: Offset applied to voltages to compensate for voltage drops
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regulator-min-microamp:
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description: smallest current consumers may set
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regulator-max-microamp:
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description: largest current consumers may set
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regulator-input-current-limit-microamp:
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description: maximum input current regulator allows
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regulator-always-on:
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description: boolean, regulator should never be disabled
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type: boolean
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regulator-boot-on:
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description: bootloader/firmware enabled regulator.
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It's expected that this regulator was left on by the bootloader.
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If the bootloader didn't leave it on then OS should turn it on
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at boot but shouldn't prevent it from being turned off later.
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This property is intended to only be used for regulators where
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software cannot read the state of the regulator.
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type: boolean
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regulator-allow-bypass:
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description: allow the regulator to go into bypass mode
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type: boolean
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regulator-allow-set-load:
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description: allow the regulator performance level to be configured
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type: boolean
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regulator-ramp-delay:
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description: ramp delay for regulator(in uV/us) For hardware which supports
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disabling ramp rate, it should be explicitly initialised to zero (regulator-ramp-delay
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= <0>) for disabling ramp delay.
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$ref: "/schemas/types.yaml#/definitions/uint32"
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regulator-enable-ramp-delay:
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description: The time taken, in microseconds, for the supply rail to
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reach the target voltage, plus/minus whatever tolerance the board
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design requires. This property describes the total system ramp time
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required due to the combination of internal ramping of the regulator
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itself, and board design issues such as trace capacitance and load
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on the supply.
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$ref: "/schemas/types.yaml#/definitions/uint32"
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regulator-settling-time-us:
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description: Settling time, in microseconds, for voltage change if regulator
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have the constant time for any level voltage change. This is useful
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when regulator have exponential voltage change.
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regulator-settling-time-up-us:
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description: Settling time, in microseconds, for voltage increase if
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the regulator needs a constant time to settle after voltage increases
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of any level. This is useful for regulators with exponential voltage
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changes.
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regulator-settling-time-down-us:
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description: Settling time, in microseconds, for voltage decrease if
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the regulator needs a constant time to settle after voltage decreases
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of any level. This is useful for regulators with exponential voltage
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changes.
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regulator-soft-start:
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description: Enable soft start so that voltage ramps slowly
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type: boolean
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regulator-initial-mode:
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description: initial operating mode. The set of possible operating modes
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depends on the capabilities of every hardware so each device binding
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documentation explains which values the regulator supports.
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$ref: "/schemas/types.yaml#/definitions/uint32"
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regulator-allowed-modes:
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description: list of operating modes that software is allowed to configure
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for the regulator at run-time. Elements may be specified in any order.
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The set of possible operating modes depends on the capabilities of
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every hardware so each device binding document explains which values
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the regulator supports.
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$ref: "/schemas/types.yaml#/definitions/uint32-array"
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regulator-system-load:
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description: Load in uA present on regulator that is not captured by
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any consumer request.
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$ref: "/schemas/types.yaml#/definitions/uint32"
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regulator-pull-down:
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description: Enable pull down resistor when the regulator is disabled.
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type: boolean
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regulator-over-current-protection:
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description: Enable over current protection.
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type: boolean
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regulator-active-discharge:
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description: |
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tristate, enable/disable active discharge of regulators. The values are:
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0: Disable active discharge.
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1: Enable active discharge.
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Absence of this property will leave configuration to default.
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allOf:
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- $ref: "/schemas/types.yaml#/definitions/uint32"
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- enum: [ 0, 1 ]
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regulator-coupled-with:
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description: Regulators with which the regulator is coupled. The linkage
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is 2-way - all coupled regulators should be linked with each other.
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A regulator should not be coupled with its supplier.
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$ref: "/schemas/types.yaml#/definitions/phandle-array"
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regulator-coupled-max-spread:
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description: Array of maximum spread between voltages of coupled regulators
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in microvolts, each value in the array relates to the corresponding
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couple specified by the regulator-coupled-with property.
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$ref: "/schemas/types.yaml#/definitions/uint32"
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regulator-max-step-microvolt:
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description: Maximum difference between current and target voltages
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that can be changed safely in a single step.
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patternProperties:
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".*-supply$":
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description: Input supply phandle(s) for this node
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regulator-state-(standby|mem|disk):
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type: object
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description:
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sub-nodes for regulator state in Standby, Suspend-to-RAM, and
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Suspend-to-DISK modes. Equivalent with standby, mem, and disk Linux
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sleep states.
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properties:
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regulator-on-in-suspend:
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description: regulator should be on in suspend state.
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type: boolean
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regulator-off-in-suspend:
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description: regulator should be off in suspend state.
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type: boolean
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regulator-suspend-min-microvolt:
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description: minimum voltage may be set in suspend state.
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regulator-suspend-max-microvolt:
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description: maximum voltage may be set in suspend state.
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regulator-suspend-microvolt:
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description: the default voltage which regulator would be set in
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suspend. This property is now deprecated, instead setting voltage
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for suspend mode via the API which regulator driver provides is
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recommended.
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regulator-changeable-in-suspend:
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description: whether the default voltage and the regulator on/off
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in suspend can be changed in runtime.
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type: boolean
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regulator-mode:
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description: operating mode in the given suspend state. The set
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of possible operating modes depends on the capabilities of every
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hardware so the valid modes are documented on each regulator device
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tree binding document.
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$ref: "/schemas/types.yaml#/definitions/uint32"
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additionalProperties: false
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examples:
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- |
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xyzreg: regulator@0 {
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regulator-min-microvolt = <1000000>;
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regulator-max-microvolt = <2500000>;
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regulator-always-on;
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vin-supply = <&vin>;
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regulator-state-mem {
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regulator-on-in-suspend;
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};
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};
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...
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