xref: /kernel/linux/linux-5.10/Documentation/devicetree/bindings/bus/simple-pm-bus.yaml

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

title: Simple Power-Managed Bus

maintainers:
  - Geert Uytterhoeven <geert+renesas@glider.be>

description: |
  A Simple Power-Managed Bus is a transparent bus that doesn't need a real
  driver, as it's typically initialized by the boot loader.

  However, its bus controller is part of a PM domain, or under the control
  of a functional clock.  Hence, the bus controller's PM domain and/or
  clock must be enabled for child devices connected to the bus (either
  on-SoC or externally) to function.

  While "simple-pm-bus" follows the "simple-bus" set of properties, as
  specified in the Devicetree Specification, it is not an extension of
  "simple-bus".

properties:
  $nodename:
    pattern: "^bus(@[0-9a-f]+)?$"

  compatible:
    contains:
      const: simple-pm-bus
    description:
      Shall contain "simple-pm-bus" in addition to a optional bus-specific
      compatible strings defined in individual pm-bus bindings.

  '#address-cells':
    enum: [ 1, 2 ]

  '#size-cells':
    enum: [ 1, 2 ]

  ranges: true

  clocks: true
    # Functional clocks
    # Required if power-domains is absent, optional otherwise

  power-domains:
    # Required if clocks is absent, optional otherwise
    minItems: 1

required:
  - compatible
  - '#address-cells'
  - '#size-cells'
  - ranges

anyOf:
  - required:
      - clocks
  - required:
      - power-domains

additionalProperties: true

examples:
  - |
    #include <dt-bindings/clock/qcom,gcc-msm8996.h>
    #include <dt-bindings/interrupt-controller/irq.h>

    bus {
        power-domains = <&gcc AGGRE0_NOC_GDSC>;
        compatible = "simple-pm-bus";
        #address-cells = <1>;
        #size-cells = <1>;
        ranges;
    };