Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
# Copyright 2019 BayLibre, SAS
%YAML 1.2
---
$id: http://devicetree.org/schemas/net/amlogic,meson-dwmac.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Amlogic Meson DWMAC Ethernet controller

maintainers:
  - Neil Armstrong <neil.armstrong@linaro.org>
  - Martin Blumenstingl <martin.blumenstingl@googlemail.com>

# We need a select here so we don't match all nodes with 'snps,dwmac'
select:
  properties:
    compatible:
      contains:
        enum:
          - amlogic,meson6-dwmac
          - amlogic,meson8b-dwmac
          - amlogic,meson8m2-dwmac
          - amlogic,meson-gxbb-dwmac
          - amlogic,meson-axg-dwmac
          - amlogic,meson-g12a-dwmac
  required:
    - compatible

allOf:
  - $ref: snps,dwmac.yaml#
  - if:
      properties:
        compatible:
          contains:
            enum:
              - amlogic,meson8b-dwmac
              - amlogic,meson8m2-dwmac
              - amlogic,meson-gxbb-dwmac
              - amlogic,meson-axg-dwmac
              - amlogic,meson-g12a-dwmac

    then:
      properties:
        clocks:
          minItems: 3
          items:
            - description: GMAC main clock
            - description: First parent clock of the internal mux
            - description: Second parent clock of the internal mux
            - description: The clock which drives the timing adjustment logic

        clock-names:
          minItems: 3
          items:
            - const: stmmaceth
            - const: clkin0
            - const: clkin1
            - const: timing-adjustment

        amlogic,tx-delay-ns:
          enum: [0, 2, 4, 6]
          default: 2
          description:
            The internal RGMII TX clock delay (provided by this driver)
            in nanoseconds. When phy-mode is set to "rgmii" then the TX
            delay should be explicitly configured. When the phy-mode is
            set to either "rgmii-id" or "rgmii-txid" the TX clock delay
            is already provided by the PHY. In that case this property
            should be set to 0ns (which disables the TX clock delay in
            the MAC to prevent the clock from going off because both
            PHY and MAC are adding a delay). Any configuration is
            ignored when the phy-mode is set to "rmii".

        amlogic,rx-delay-ns:
          deprecated: true
          enum:
            - 0
            - 2
          default: 0
          description:
            The internal RGMII RX clock delay in nanoseconds. Deprecated, use
            rx-internal-delay-ps instead.

        rx-internal-delay-ps:
          default: 0

  - if:
      properties:
        compatible:
          contains:
            enum:
              - amlogic,meson8b-dwmac
              - amlogic,meson8m2-dwmac
              - amlogic,meson-gxbb-dwmac
              - amlogic,meson-axg-dwmac
    then:
      properties:
        rx-internal-delay-ps:
          enum:
            - 0
            - 2000

  - if:
      properties:
        compatible:
          contains:
            enum:
              - amlogic,meson-g12a-dwmac
    then:
      properties:
        rx-internal-delay-ps:
          enum:
            - 0
            - 200
            - 400
            - 600
            - 800
            - 1000
            - 1200
            - 1400
            - 1600
            - 1800
            - 2000
            - 2200
            - 2400
            - 2600
            - 2800
            - 3000

properties:
  compatible:
    additionalItems: true
    maxItems: 3
    items:
      - enum:
          - amlogic,meson6-dwmac
          - amlogic,meson8b-dwmac
          - amlogic,meson8m2-dwmac
          - amlogic,meson-gxbb-dwmac
          - amlogic,meson-axg-dwmac
          - amlogic,meson-g12a-dwmac
    contains:
      enum:
        - snps,dwmac-3.70a
        - snps,dwmac

  reg:
    items:
      - description:
          The first register range should be the one of the DWMAC controller
      - description:
          The second range is for the Amlogic specific configuration
          (for example the PRG_ETHERNET register range on Meson8b and newer)

  interrupts:
    maxItems: 1

  interrupt-names:
    const: macirq

required:
  - compatible
  - reg
  - interrupts
  - interrupt-names
  - clocks
  - clock-names
  - phy-mode

unevaluatedProperties: false

examples:
  - |
    ethmac: ethernet@c9410000 {
        compatible = "amlogic,meson-gxbb-dwmac", "snps,dwmac";
        reg = <0xc9410000 0x10000>, <0xc8834540 0x8>;
        interrupts = <8>;
        interrupt-names = "macirq";
        clocks = <&clk_eth>, <&clk_fclk_div2>, <&clk_mpll2>, <&clk_fclk_div2>;
        clock-names = "stmmaceth", "clkin0", "clkin1", "timing-adjustment";
        phy-mode = "rgmii";
    };