FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/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 <neil.armstrong@linaro.org>
    
    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>;
               };
           };
       };

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