dt-bindings: mediatek,dp: Add Display Port binding

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)

%YAML 1.2

---

$id: http://devicetree.org/schemas/display/mediatek/mediatek,dp.yaml#

$schema: http://devicetree.org/meta-schemas/core.yaml#

title: MediaTek Display Port Controller

maintainers:

  - Chun-Kuang Hu <chunkuang.hu@kernel.org>

  - Jitao shi <jitao.shi@mediatek.com>

description: |

  MediaTek DP and eDP are different hardwares and there are some features

  which are not supported for eDP. For example, audio is not supported for

  eDP. Therefore, we need to use two different compatibles to describe them.

  In addition, We just need to enable the power domain of DP, so the clock

  of DP is generated by itself and we are not using other PLL to generate

  clocks.

properties:

  compatible:

    enum:

      - mediatek,mt8195-dp-tx

      - mediatek,mt8195-edp-tx

  reg:

    maxItems: 1

  nvmem-cells:

    maxItems: 1

    description: efuse data for display port calibration

  nvmem-cell-names:

    const: dp_calibration_data

  power-domains:

    maxItems: 1

  interrupts:

    maxItems: 1

  ports:

    $ref: /schemas/graph.yaml#/properties/ports

    properties:

      port@0:

        $ref: /schemas/graph.yaml#/properties/port

        description: Input endpoint of the controller, usually dp_intf

      port@1:

        $ref: /schemas/graph.yaml#/$defs/port-base

        unevaluatedProperties: false

        description: Output endpoint of the controller

        properties:

          endpoint:

            $ref: /schemas/media/video-interfaces.yaml#

            unevaluatedProperties: false

            properties:

              data-lanes:

                description: |

                  number of lanes supported by the hardware.

                  The possible values:

                  0       - For 1 lane enabled in IP.

                  0 1     - For 2 lanes enabled in IP.

                  0 1 2 3 - For 4 lanes enabled in IP.

                minItems: 1

                maxItems: 4

            required:

              - data-lanes

    required:

      - port@0

      - port@1

  max-linkrate-mhz:

    enum: [ 1620, 2700, 5400, 8100 ]

    description: maximum link rate supported by the hardware.

required:

  - compatible

  - reg

  - interrupts

  - ports

  - max-linkrate-mhz

additionalProperties: false

examples:

  - |

    #include <dt-bindings/interrupt-controller/arm-gic.h>

    #include <dt-bindings/power/mt8195-power.h>

    dptx@1c600000 {

        compatible = "mediatek,mt8195-dp-tx";

        reg = <0x1c600000 0x8000>;

        power-domains = <&spm MT8195_POWER_DOMAIN_DP_TX>;

        interrupts = <GIC_SPI 458 IRQ_TYPE_LEVEL_HIGH 0>;

        max-linkrate-mhz = <8100>;

        ports {

            #address-cells = <1>;

            #size-cells = <0>;

            port@0 {

                reg = <0>;

                dptx_in: endpoint {

                    remote-endpoint = <&dp_intf0_out>;

                };

            };

            port@1 {

                reg = <1>;

                dptx_out: endpoint {

                    data-lanes = <0 1 2 3>;

                };

            };

        };

    };