xref: /linux/Documentation/devicetree/bindings/gpio/snps,dw-apb-gpio.yaml (revision 4f18093743673d4e21a5619dc323adb1dc2021e9)

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/gpio/snps,dw-apb-gpio.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Synopsys DesignWare APB GPIO controller

description: |
  Synopsys DesignWare GPIO controllers have a configurable number of ports,
  each of which are intended to be represented as child nodes with the generic
  GPIO-controller properties as desribed in this bindings file.

maintainers:
  - Hoan Tran <hoan@os.amperecomputing.com>

properties:
  $nodename:
    pattern: "^gpio@[0-9a-f]+$"

  compatible:
    const: snps,dw-apb-gpio

  "#address-cells":
    const: 1

  "#size-cells":
    const: 0

  reg:
    maxItems: 1

  clocks:
    minItems: 1
    items:
      - description: APB interface clock source
      - description: DW GPIO debounce reference clock source

  clock-names:
    minItems: 1
    items:
      - const: bus
      - const: db

  resets:
    maxItems: 1

patternProperties:
  "^gpio-(port|controller)@[0-9a-f]+$":
    type: object
    properties:
      compatible:
        const: snps,dw-apb-gpio-port

      reg:
        maxItems: 1

      gpio-controller: true

      '#gpio-cells':
        const: 2

      snps,nr-gpios:
        description: The number of GPIO pins exported by the port.
        default: 32
        allOf:
          - $ref: /schemas/types.yaml#/definitions/uint32
          - minimum: 1
            maximum: 32

      interrupts:
        description: |
          The interrupts to the parent controller raised when GPIOs generate
          the interrupts. If the controller provides one combined interrupt
          for all GPIOs, specify a single interrupt. If the controller provides
          one interrupt for each GPIO, provide a list of interrupts that
          correspond to each of the GPIO pins.
        minItems: 1
        maxItems: 32

      interrupt-controller: true

      '#interrupt-cells':
        const: 2

    required:
      - compatible
      - reg
      - gpio-controller
      - '#gpio-cells'

    dependencies:
      interrupt-controller: [ interrupts ]

    additionalProperties: false

additionalProperties: false

required:
  - compatible
  - reg
  - "#address-cells"
  - "#size-cells"

examples:
  - |
    gpio: gpio@20000 {
      compatible = "snps,dw-apb-gpio";
      reg = <0x20000 0x1000>;
      #address-cells = <1>;
      #size-cells = <0>;

      porta: gpio-port@0 {
        compatible = "snps,dw-apb-gpio-port";
        reg = <0>;
        gpio-controller;
        #gpio-cells = <2>;
        snps,nr-gpios = <8>;
        interrupt-controller;
        #interrupt-cells = <2>;
        interrupt-parent = <&vic1>;
        interrupts = <0>;
      };

      portb: gpio-port@1 {
        compatible = "snps,dw-apb-gpio-port";
        reg = <1>;
        gpio-controller;
        #gpio-cells = <2>;
        snps,nr-gpios = <8>;
      };
    };
...