Documentation/devicetree/bindings/regulator/pwm-regulator.yaml

Source file repositories/reference/linux-study-clean/Documentation/devicetree/bindings/regulator/pwm-regulator.yaml

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System
Linux kernel
Corpus path
Documentation/devicetree/bindings/regulator/pwm-regulator.yaml
Extension
.yaml
Size
3993 bytes
Lines
128
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: configuration, schema, or hardware description
Status
atlas-only

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Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

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

title: Generic PWM Regulator

maintainers:
  - Brian Norris <briannorris@chromium.org>
  - Lee Jones <lee@kernel.org>
  - Alexandre Courbot <acourbot@nvidia.com>

description: |
  Currently supports 2 modes of operation:

  Voltage Table:
    When in this mode, a voltage table (See below) of predefined voltage <=>
    duty-cycle values must be provided via DT. Limitations are that the
    regulator can only operate at the voltages supplied in the table.
    Intermediary duty-cycle values which would normally allow finer grained
    voltage selection are ignored and rendered useless.  Although more control
    is given to the user if the assumptions made in continuous-voltage mode do
    not reign true.

  Continuous Voltage:
    This mode uses the regulator's maximum and minimum supplied voltages
    specified in the regulator-{min,max}-microvolt properties to calculate
    appropriate duty-cycle values.  This allows for a much more fine grained
    solution when compared with voltage-table mode above.  This solution does
    make an assumption that a %50 duty-cycle value will cause the regulator
    voltage to run at half way between the supplied max_uV and min_uV values.

  If voltage-table is provided, then the device will be used in Voltage Table
  Mode.  If no voltage-table is provided, then the device will be used in
  Continuous Voltage Mode.

allOf:
  - $ref: regulator.yaml#

properties:
  compatible:
    const: pwm-regulator

  pwms:
    maxItems: 1

  voltage-table:
    description: Voltage and Duty-Cycle table.
    $ref: /schemas/types.yaml#/definitions/uint32-matrix
    items:
      items:
        - description: voltage in microvolts (uV)
        - description: duty-cycle in percent (%)

  enable-gpios:
    description: Regulator enable GPIO
    maxItems: 1

   # Optional properties for Continuous mode:
  pwm-dutycycle-unit:
    description:
      Integer value encoding the duty cycle unit. If not
        defined, <100> is assumed, meaning that
        pwm-dutycycle-range contains values expressed in
        percent.
    $ref: /schemas/types.yaml#/definitions/uint32
    default: 100

  pwm-dutycycle-range:

Annotation

Implementation Notes