xref: /kernel/linux/linux-5.10/Documentation/devicetree/bindings/pwm/pwm-samsung.yaml

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

title: Samsung SoC PWM timers

maintainers:
  - Thierry Reding <thierry.reding@gmail.com>
  - Krzysztof Kozlowski <krzk@kernel.org>

description: |+
  Samsung SoCs contain PWM timer blocks which can be used for system clock source
  and clock event timers, as well as to drive SoC outputs with PWM signal. Each
  PWM timer block provides 5 PWM channels (not all of them can drive physical
  outputs - see SoC and board manual).

  Be aware that the clocksource driver supports only uniprocessor systems.

properties:
  compatible:
    enum:
      - samsung,s3c2410-pwm             # 16-bit, S3C24xx
      - samsung,s3c6400-pwm             # 32-bit, S3C64xx
      - samsung,s5p6440-pwm             # 32-bit, S5P64x0
      - samsung,s5pc100-pwm             # 32-bit, S5PC100, S5PV210, Exynos4210 rev0 SoCs
      - samsung,exynos4210-pwm          # 32-bit, Exynos

  reg:
    maxItems: 1

  clocks:
    minItems: 1
    maxItems: 3

  clock-names:
    description: |
      Should contain all following required clock names:
      - "timers" - PWM base clock used to generate PWM signals,
      and any subset of following optional clock names:
      - "pwm-tclk0" - first external PWM clock source,
      - "pwm-tclk1" - second external PWM clock source.
      Note that not all IP variants allow using all external clock sources.
      Refer to SoC documentation to learn which clock source configurations
      are available.
    oneOf:
      - items:
          - const: timers
      - items:
          - const: timers
          - const: pwm-tclk0
      - items:
          - const: timers
          - const: pwm-tclk1
      - items:
          - const: timers
          - const: pwm-tclk0
          - const: pwm-tclk1

  interrupts:
    description:
      One interrupt per timer, starting at timer 0. Necessary only for SoCs which
      use PWM clocksource.
    minItems: 1
    maxItems: 5

  "#pwm-cells":
    description:
      The only third cell flag supported by this binding
      is PWM_POLARITY_INVERTED.
    const: 3

  samsung,pwm-outputs:
    description:
      A list of PWM channels used as PWM outputs on particular platform.
      It is an array of up to 5 elements being indices of PWM channels
      (from 0 to 4), the order does not matter.
    $ref: /schemas/types.yaml#/definitions/uint32-array
    uniqueItems: true
    items:
      minimum: 0
      maximum: 4

required:
  - clocks
  - clock-names
  - compatible
  - "#pwm-cells"
  - reg

additionalProperties: false

allOf:
  - $ref: pwm.yaml#

  - if:
      properties:
        compatible:
          contains:
            enum:
              - samsung,s3c2410-pwm
              - samsung,s3c6400-pwm
              - samsung,s5p6440-pwm
              - samsung,s5pc100-pwm
    then:
      required:
        - interrupts

examples:
  - |
    pwm@7f006000 {
        compatible = "samsung,s3c6400-pwm";
        reg = <0x7f006000 0x1000>;
        interrupt-parent = <&vic0>;
        interrupts = <23>, <24>, <25>, <27>, <28>;
        clocks = <&clock 67>;
        clock-names = "timers";
        samsung,pwm-outputs = <0>, <1>;
        #pwm-cells = <3>;
    };