Documentation/devicetree/bindings/display/amlogic,meson-vpu.yaml

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

title: Amlogic Meson Display Controller

maintainers:
  - Neil Armstrong <narmstrong@baylibre.com>

description: |
  The Amlogic Meson Display controller is composed of several components
  that are going to be documented below

  DMC|---------------VPU (Video Processing Unit)----------------|------HHI------|
     | vd1   _______     _____________    _________________     |               |
  D  |-------|      |----|            |   |                |    |   HDMI PLL    |
  D  | vd2   | VIU  |    | Video Post |   | Video Encoders |<---|-----VCLK      |
  R  |-------|      |----| Processing |   |                |    |               |
     | osd2  |      |    |            |---| Enci ----------|----|-----VDAC------|
  R  |-------| CSC  |----| Scalers    |   | Encp ----------|----|----HDMI-TX----|
  A  | osd1  |      |    | Blenders   |   | Encl ----------|----|---------------|
  M  |-------|______|----|____________|   |________________|    |               |
  ___|__________________________________________________________|_______________|


  VIU: Video Input Unit
  ---------------------

  The Video Input Unit is in charge of the pixel scanout from the DDR memory.
  It fetches the frames addresses, stride and parameters from the "Canvas" memory.
  This part is also in charge of the CSC (Colorspace Conversion).
  It can handle 2 OSD Planes and 2 Video Planes.

  VPP: Video Post Processing
  --------------------------

  The Video Post Processing is in charge of the scaling and blending of the
  various planes into a single pixel stream.
  There is a special "pre-blending" used by the video planes with a dedicated
  scaler and a "post-blending" to merge with the OSD Planes.
  The OSD planes also have a dedicated scaler for one of the OSD.

  VENC: Video Encoders
  --------------------

  The VENC is composed of the multiple pixel encoders
   - ENCI : Interlace Video encoder for CVBS and Interlace HDMI
   - ENCP : Progressive Video Encoder for HDMI
   - ENCL : LCD LVDS Encoder
  The VENC Unit gets a Pixel Clocks (VCLK) from a dedicated HDMI PLL and clock
  tree and provides the scanout clock to the VPP and VIU.
  The ENCI is connected to a single VDAC for Composite Output.
  The ENCI and ENCP are connected to an on-chip HDMI Transceiver.

properties:
  compatible:
    oneOf:
      - items:
          - enum:
              - amlogic,meson-gxbb-vpu # GXBB (S905)
              - amlogic,meson-gxl-vpu # GXL (S905X, S905D)
              - amlogic,meson-gxm-vpu # GXM (S912)
          - const: amlogic,meson-gx-vpu
      - enum:
          - amlogic,meson-g12a-vpu # G12A (S905X2, S905Y2, S905D2)

  reg:
    maxItems: 2

  reg-names:
    items:
      - const: vpu
      - const: hhi

  interrupts:
    maxItems: 1

  amlogic,canvas:
    description: should point to a canvas provider node
    $ref: /schemas/types.yaml#/definitions/phandle

  power-domains:
    maxItems: 1
    description: phandle to the associated power domain

  port@0:
    $ref: /schemas/graph.yaml#/properties/port
    description:
      A port node pointing to the CVBS VDAC port node.

  port@1:
    $ref: /schemas/graph.yaml#/properties/port
    description:
      A port node pointing to the HDMI-TX port node.

  "#address-cells":
    const: 1

  "#size-cells":
    const: 0

required:
  - compatible
  - reg
  - interrupts
  - port@0
  - port@1
  - "#address-cells"
  - "#size-cells"
  - amlogic,canvas

additionalProperties: false

examples:
  - |
    vpu: vpu@d0100000 {
        compatible = "amlogic,meson-gxbb-vpu", "amlogic,meson-gx-vpu";
        reg = <0xd0100000 0x100000>, <0xc883c000 0x1000>;
        reg-names = "vpu", "hhi";
        interrupts = <3>;
        #address-cells = <1>;
        #size-cells = <0>;
        amlogic,canvas = <&canvas>;

        /* CVBS VDAC output port */
        port@0 {
            reg = <0>;

            cvbs_vdac_out: endpoint {
                remote-endpoint = <&tv_connector_in>;
            };
        };

        /* HDMI TX output port */
        port@1 {
            reg = <1>;

            hdmi_tx_out: endpoint {
                remote-endpoint = <&hdmi_tx_in>;
            };
        };
    };