linux/Documentation/devicetree/bindings/display/arm,pl11x.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/display/arm,pl11x.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Arm PrimeCell Color LCD Controller PL110/PL111

maintainers:
  - Liviu Dudau <Liviu.Dudau@arm.com>
  - Andre Przywara <andre.przywara@arm.com>

description:
  The Arm Primcell PL010/PL111 is an LCD controller IP, than scans out
  a framebuffer region in system memory, and creates timed signals for
  a variety of LCD panels.

# We need a select here so we don't match all nodes with 'arm,primecell'
select:
  properties:
    compatible:
      contains:
        enum:
          - arm,pl110
          - arm,pl111
  required:
    - compatible

properties:
  compatible:
    items:
      - enum:
          - arm,pl110
          - arm,pl111
      - const: arm,primecell

  reg:
    maxItems: 1

  interrupt-names:
    oneOf:
      - const: combined
        description:
          The IP provides four individual interrupt lines, but also one
          combined line. If the integration only connects this line to the
          interrupt controller, this single interrupt is noted here.
      - items:
          - const: mbe        # CLCDMBEINTR
          - const: vcomp      # CLCDVCOMPINTR
          - const: lnbu       # CLCDLNBUINTR
          - const: fuf        # CLCDFUFINTR

  interrupts:
    minItems: 1
    maxItems: 4

  clock-names:
    items:
      - const: clcdclk
      - const: apb_pclk

  clocks:
    items:
      - description: The CLCDCLK reference clock for the controller.
      - description: The HCLK AHB slave clock for the register access.

  memory-region:
    maxItems: 1
    description:
      Phandle to a node describing memory to be used for the framebuffer.
      If not present, the framebuffer may be located anywhere in memory.

  max-memory-bandwidth:
    $ref: /schemas/types.yaml#/definitions/uint32
    description:
      Maximum bandwidth in bytes per second that the cell's memory interface
      can handle.
      If not present, the memory interface is fast enough to handle all
      possible video modes.

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

    description:
      Output endpoint of the controller, connecting the LCD panel signals.

    properties:
      endpoint:
        $ref: /schemas/graph.yaml#/$defs/endpoint-base
        unevaluatedProperties: false

        properties:
          arm,pl11x,tft-r0g0b0-pads:
            $ref: /schemas/types.yaml#/definitions/uint32-array
            items:
              - description: index of CLD pad used for first red bit (R0)
              - description: index of CLD pad used for first green bit (G0)
              - description: index of CLD pad used for first blue bit (G0)
            deprecated: true
            description: |
              DEPRECATED. An array of three 32-bit values, defining the way
              CLD[23:0] pads are wired up.
              The first value contains the index of the "CLD" external pin (pad)
              used as R0 (first bit of the red component), the second value for
              green, the third value for blue.
              See also "LCD panel signal multiplexing details" paragraphs in the
              PL110/PL111 Technical Reference Manuals.
              This implicitly defines available color modes, for example:
              - PL111 TFT 4:4:4 panel:
                  arm,pl11x,tft-r0g0b0-pads = <4 15 20>;
              - PL110 TFT (1:)5:5:5 panel:
                  arm,pl11x,tft-r0g0b0-pads = <1 7 13>;
              - PL111 TFT (1:)5:5:5 panel:
                  arm,pl11x,tft-r0g0b0-pads = <3 11 19>;
              - PL111 TFT 5:6:5 panel:
                  arm,pl11x,tft-r0g0b0-pads = <3 10 19>;
              - PL110 and PL111 TFT 8:8:8 panel:
                  arm,pl11x,tft-r0g0b0-pads = <0 8 16>;
              - PL110 and PL111 TFT 8:8:8 panel, R & B components swapped:
                  arm,pl11x,tft-r0g0b0-pads = <16 8 0>;              

additionalProperties: false

required:
  - compatible
  - reg
  - clock-names
  - clocks
  - port

allOf:
  - if:
      properties:
        interrupts:
          minItems: 2
      required:
        - interrupts
    then:
      required:
        - interrupt-names

examples:
  - |
    clcd@10020000 {
        compatible = "arm,pl111", "arm,primecell";
        reg = <0x10020000 0x1000>;
        interrupt-names = "combined";
        interrupts = <44>;
        clocks = <&oscclk1>, <&oscclk2>;
        clock-names = "clcdclk", "apb_pclk";
        max-memory-bandwidth = <94371840>; /* Bps, 1024x768@60 16bpp */

        port {
            clcd_pads: endpoint {
                remote-endpoint = <&clcd_panel>;
            };
        };
    };

    panel {
        compatible = "arm,rtsm-display";

        port {
            clcd_panel: endpoint {
                remote-endpoint = <&clcd_pads>;
            };
        };
    };    
...