path: root/Documentation/devicetree/bindings/regulator/regulator.yaml

# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/regulator/regulator.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Voltage/Current Regulators

maintainers:
  - Liam Girdwood <lgirdwood@gmail.com>
  - Mark Brown <broonie@kernel.org>

properties:
  regulator-name:
    description: A string used as a descriptive name for regulator outputs
    $ref: /schemas/types.yaml#/definitions/string

  regulator-min-microvolt:
    description: smallest voltage consumers may set

  regulator-max-microvolt:
    description: largest voltage consumers may set

  regulator-microvolt-offset:
    description: Offset applied to voltages to compensate for voltage drops
    $ref: /schemas/types.yaml#/definitions/uint32

  regulator-min-microamp:
    description: smallest current consumers may set

  regulator-max-microamp:
    description: largest current consumers may set

  regulator-input-current-limit-microamp:
    description: maximum input current regulator allows

  regulator-always-on:
    description: boolean, regulator should never be disabled
    type: boolean

  regulator-boot-on:
    description: bootloader/firmware enabled regulator.
      It's expected that this regulator was left on by the bootloader.
      If the bootloader didn't leave it on then OS should turn it on
      at boot but shouldn't prevent it from being turned off later.
      This property is intended to only be used for regulators where
      software cannot read the state of the regulator.
    type: boolean

  regulator-allow-bypass:
    description: allow the regulator to go into bypass mode
    type: boolean

  regulator-allow-set-load:
    description: allow the regulator performance level to be configured
    type: boolean

  regulator-ramp-delay:
    description: ramp delay for regulator(in uV/us) For hardware which supports
      disabling ramp rate, it should be explicitly initialised to zero (regulator-ramp-delay
      = <0>) for disabling ramp delay.
    $ref: /schemas/types.yaml#/definitions/uint32

  regulator-enable-ramp-delay:
    description: The time taken, in microseconds, for the supply rail to
      reach the target voltage, plus/minus whatever tolerance the board
      design requires. This property describes the total system ramp time
      required due to the combination of internal ramping of the regulator
      itself, and board design issues such as trace capacitance and load
      on the supply.
    $ref: /schemas/types.yaml#/definitions/uint32

  regulator-settling-time-us:
    description: Settling time, in microseconds, for voltage change if regulator
      have the constant time for any level voltage change. This is useful
      when regulator have exponential voltage change.

  regulator-settling-time-up-us:
    description: Settling time, in microseconds, for voltage increase if
      the regulator needs a constant time to settle after voltage increases
      of any level. This is useful for regulators with exponential voltage
      changes.

  regulator-settling-time-down-us:
    description: Settling time, in microseconds, for voltage decrease if
      the regulator needs a constant time to settle after voltage decreases
      of any level. This is useful for regulators with exponential voltage
      changes.

  regulator-soft-start:
    description: Enable soft start so that voltage ramps slowly
    type: boolean

  regulator-initial-mode:
    description: initial operating mode. The set of possible operating modes
      depends on the capabilities of every hardware so each device binding
      documentation explains which values the regulator supports.
    $ref: /schemas/types.yaml#/definitions/uint32

  regulator-allowed-modes:
    description: list of operating modes that software is allowed to configure
      for the regulator at run-time.  Elements may be specified in any order.
      The set of possible operating modes depends on the capabilities of
      every hardware so each device binding document explains which values
      the regulator supports.
    $ref: /schemas/types.yaml#/definitions/uint32-array

  regulator-system-load:
    description: Load in uA present on regulator that is not captured by
      any consumer request.
    $ref: /schemas/types.yaml#/definitions/uint32

  regulator-pull-down:
    description: Enable pull down resistor when the regulator is disabled.
    type: boolean

  system-critical-regulator:
    description: Set if the regulator is critical to system stability or
      functionality.
    type: boolean

  regulator-over-current-protection:
    description: Enable over current protection.
    type: boolean

  regulator-oc-protection-microamp:
    description: Set over current protection limit. This is a limit where
      hardware performs emergency shutdown. Zero can be passed to disable
      protection and value '1' indicates that protection should be enabled but
      limit setting can be omitted.

  regulator-oc-error-microamp:
    description: Set over current error limit. This is a limit where part of
      the hardware probably is malfunctional and damage prevention is requested.
      Zero can be passed to disable error detection and value '1' indicates
      that detection should be enabled but limit setting can be omitted.

  regulator-oc-warn-microamp:
    description: Set over current warning limit. This is a limit where hardware
      is assumed still to be functional but approaching limit where it gets
      damaged. Recovery actions should be initiated. Zero can be passed to
      disable detection and value '1' indicates that detection should
      be enabled but limit setting can be omitted.

  regulator-ov-protection-microvolt:
    description: Set over voltage protection limit. This is a limit where
      hardware performs emergency shutdown. Zero can be passed to disable
      protection and value '1' indicates that protection should be enabled but
      limit setting can be omitted. Limit is given as microvolt offset from
      voltage set to regulator.

  regulator-ov-error-microvolt:
    description: Set over voltage error limit. This is a limit where part of
      the hardware probably is malfunctional and damage prevention is requested
      Zero can be passed to disable error detection and value '1' indicates
      that detection should be enabled but limit setting can be omitted. Limit
      is given as microvolt offset from voltage set to regulator.

  regulator-ov-warn-microvolt:
    description: Set over voltage warning limit. This is a limit where hardware
      is assumed still to be functional but approaching limit where it gets
      damaged. Recovery actions should be initiated. Zero can be passed to
      disable detection and value '1' indicates that detection should
      be enabled but limit setting can be omitted. Limit is given as microvolt
      offset from voltage set to regulator.

  regulator-uv-protection-microvolt:
    description: Set over under voltage protection limit. This is a limit where
      hardware performs emergency shutdown. Zero can be passed to disable
      protection and value '1' indicates that protection should be enabled but
      limit setting can be omitted. Limit is given as microvolt offset from
      voltage set to regulator.

  regulator-uv-error-microvolt:
    description: Set under voltage error limit. This is a limit where part of
      the hardware probably is malfunctional and damage prevention is requested
      Zero can be passed to disable error detection and value '1' indicates
      that detection should be enabled but limit setting can be omitted. Limit
      is given as microvolt offset from voltage set to regulator.

  regulator-uv-warn-microvolt:
    description: Set over under voltage warning limit. This is a limit where
      hardware is assumed still to be functional but approaching limit where
      it gets damaged. Recovery actions should be initiated. Zero can be passed
      to disable detection and value '1' indicates that detection should
      be enabled but limit setting can be omitted. Limit is given as microvolt
      offset from voltage set to regulator.

  regulator-uv-less-critical-window-ms:
    description: Specifies the time window (in milliseconds) following a
      critical under-voltage event during which the system can continue to
      operate safely while performing less critical operations. This property
      provides a defined duration before a more severe reaction to the
      under-voltage event is needed, allowing for certain non-urgent actions to
      be carried out in preparation for potential power loss.

  regulator-temp-protection-kelvin:
    description: Set over temperature protection limit. This is a limit where
      hardware performs emergency shutdown. Zero can be passed to disable
      protection and value '1' indicates that protection should be enabled but
      limit setting can be omitted.

  regulator-temp-error-kelvin:
    description: Set over temperature error limit. This is a limit where part of
      the hardware probably is malfunctional and damage prevention is requested
      Zero can be passed to disable error detection and value '1' indicates
      that detection should be enabled but limit setting can be omitted.

  regulator-temp-warn-kelvin:
    description: Set over temperature warning limit. This is a limit where
      hardware is assumed still to be functional but approaching limit where it
      gets damaged. Recovery actions should be initiated. Zero can be passed to
      disable detection and value '1' indicates that detection should
      be enabled but limit setting can be omitted.

  regulator-active-discharge:
    description: |
      tristate, enable/disable active discharge of regulators. The values are:
      0: Disable active discharge.
      1: Enable active discharge.
      Absence of this property will leave configuration to default.
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [0, 1]

  regulator-coupled-with:
    description: Regulators with which the regulator is coupled. The linkage
      is 2-way - all coupled regulators should be linked with each other.
      A regulator should not be coupled with its supplier.
    $ref: /schemas/types.yaml#/definitions/phandle-array
    items:
      maxItems: 1

  regulator-coupled-max-spread:
    description: Array of maximum spread between voltages of coupled regulators
      in microvolts, each value in the array relates to the corresponding
      couple specified by the regulator-coupled-with property.
    $ref: /schemas/types.yaml#/definitions/uint32-array

  regulator-max-step-microvolt:
    description: Maximum difference between current and target voltages
      that can be changed safely in a single step.

patternProperties:
  ".*-supply$":
    description: Input supply phandle(s) for this node

  "^regulator-state-(standby|mem|disk)$":
    type: object
    description:
      sub-nodes for regulator state in Standby, Suspend-to-RAM, and
      Suspend-to-DISK modes. Equivalent with standby, mem, and disk Linux
      sleep states.

    properties:
      regulator-on-in-suspend:
        description: regulator should be on in suspend state.
        type: boolean

      regulator-off-in-suspend:
        description: regulator should be off in suspend state.
        type: boolean

      regulator-suspend-min-microvolt:
        description: minimum voltage may be set in suspend state.

      regulator-suspend-max-microvolt:
        description: maximum voltage may be set in suspend state.

      regulator-suspend-microvolt:
        description: the default voltage which regulator would be set in
          suspend. This property is now deprecated, instead setting voltage
          for suspend mode via the API which regulator driver provides is
          recommended.

      regulator-changeable-in-suspend:
        description: whether the default voltage and the regulator on/off
          in suspend can be changed in runtime.
        type: boolean

      regulator-mode:
        description: operating mode in the given suspend state. The set
          of possible operating modes depends on the capabilities of every
          hardware so the valid modes are documented on each regulator device
          tree binding document.
        $ref: /schemas/types.yaml#/definitions/uint32

    additionalProperties: false

additionalProperties: true

examples:
  - |
    xyzreg: regulator {
      regulator-min-microvolt = <1000000>;
      regulator-max-microvolt = <2500000>;
      regulator-always-on;
      vin-supply = <&vin>;

      regulator-state-mem {
        regulator-on-in-suspend;
      };
    };

...