Documentation/devicetree/bindings/phy/apm,xgene-phy.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/phy/apm,xgene-phy.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: APM X-Gene 15Gbps Multi-purpose PHY

maintainers:
  - Khuong Dinh <khuong@os.amperecomputing.com>

description:
  PHY nodes are defined to describe on-chip 15Gbps Multi-purpose PHY. Each
  PHY (pair of lanes) has its own node.

properties:
  compatible:
    items:
      - const: apm,xgene-phy

  reg:
    maxItems: 1

  '#phy-cells':
    description:
      Possible values are 0 (SATA), 1 (SGMII), 2 (PCIe), 3 (USB), and 4 (XFI).
    const: 1

  clocks:
    maxItems: 1

  apm,tx-eye-tuning:
    description:
      Manual control to fine tune the capture of the serial bit lines from the
      automatic calibrated position. Two set of 3-tuple setting for each
      supported link speed on the host. Range from 0 to 127 in unit of one bit
      period.
    $ref: /schemas/types.yaml#/definitions/uint32-matrix
    minItems: 2
    maxItems: 2
    items:
      minItems: 3
      maxItems: 3
      items:
        minimum: 0
        maximum: 127
        default: 10

  apm,tx-eye-direction:
    description:
      Eye tuning manual control direction. 0 means sample data earlier than the
      nominal sampling point. 1 means sample data later than the nominal
      sampling point. Two set of 3-tuple setting for each supported link speed
      on the host.
    $ref: /schemas/types.yaml#/definitions/uint32-matrix
    minItems: 2
    maxItems: 2
    items:
      minItems: 3
      maxItems: 3
      items:
        enum: [0, 1]
        default: 0

  apm,tx-boost-gain:
    description:
      Frequency boost AC (LSB 3-bit) and DC (2-bit) gain control. Two set of
      3-tuple setting for each supported link speed on the host. Range is
      between 0 to 31 in unit of dB. Default is 3.
    $ref: /schemas/types.yaml#/definitions/uint32-matrix
    minItems: 2
    maxItems: 2
    items:
      minItems: 3
      maxItems: 3
      items:
        minimum: 0
        maximum: 31

  apm,tx-amplitude:
    description:
      Amplitude control. Two set of 3-tuple setting for each supported link
      speed on the host. Range is between 0 to 199500 in unit of uV.
    $ref: /schemas/types.yaml#/definitions/uint32-matrix
    minItems: 2
    maxItems: 2
    items:
      minItems: 3
      maxItems: 3
      items:
        minimum: 0
        maximum: 199500
        default: 199500

  apm,tx-pre-cursor1:
    description:
      1st pre-cursor emphasis taps control. Two set of 3-tuple setting for
      each supported link speed on the host. Range is 0 to 273000 in unit of
      uV.
    $ref: /schemas/types.yaml#/definitions/uint32-matrix
    minItems: 2
    maxItems: 2
    items:
      minItems: 3
      maxItems: 3
      items:
        minimum: 0
        maximum: 273000
        default: 0

  apm,tx-pre-cursor2:
    description:
      2nd pre-cursor emphasis taps control. Two set of 3-tuple setting for
      each supported link speed on the host. Range is 0 to 127400 in unit uV.
    $ref: /schemas/types.yaml#/definitions/uint32-matrix
    minItems: 2
    maxItems: 2
    items:
      minItems: 3
      maxItems: 3
      items:
        minimum: 0
        maximum: 127400
        default: 0

  apm,tx-post-cursor:
    description: |
      Post-cursor emphasis taps control. Two set of 3-tuple setting for Gen1,
      Gen2, and Gen3 link speeds. Range is between 0 to 31 in unit of 18.2mV.
    $ref: /schemas/types.yaml#/definitions/uint32-matrix
    minItems: 2
    maxItems: 2
    items:
      minItems: 3
      maxItems: 3
      items:
        minimum: 0
        maximum: 31
        default: 0xf

  apm,tx-speed:
    description: >
      Tx operating speed. One set of 3-tuple for each supported link speed on
      the host:

        0 = 1-2Gbps
        1 = 2-4Gbps (1st tuple default)
        2 = 4-8Gbps
        3 = 8-15Gbps (2nd tuple default)
        4 = 2.5-4Gbps
        5 = 4-5Gbps
        6 = 5-6Gbps
        7 = 6-16Gbps (3rd tuple default).

    $ref: /schemas/types.yaml#/definitions/uint32-array
    minItems: 3
    maxItems: 3
    items:
      maximum: 7

additionalProperties: false

examples:
  - |
    phy@1f21a000 {
        compatible = "apm,xgene-phy";
        reg = <0x1f21a000 0x100>;
        #phy-cells = <1>;
    };