xref: /linux/Documentation/devicetree/bindings/display/tilcdc/ti,am33xx-tilcdc.yaml (revision 0fc8f6200d2313278fbf4539bbab74677c685531)

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
# Copyright 2025 Bootlin
%YAML 1.2
---
$id: http://devicetree.org/schemas/display/tilcdc/ti,am33xx-tilcdc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: TI LCD Controller, found on AM335x, DA850, AM18x and OMAP-L138

maintainers:
  - Kory Maincent <kory.maincent@bootlin.com>

properties:
  compatible:
    enum:
      - ti,am33xx-tilcdc
      - ti,da850-tilcdc

  reg:
    maxItems: 1

  interrupts:
    maxItems: 1

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

  ti,hwmods:
    $ref: /schemas/types.yaml#/definitions/string
    description:
      Name of the hwmod associated to the LCDC

  max-bandwidth:
    $ref: /schemas/types.yaml#/definitions/uint32
    description:
      The maximum pixels per second that the memory interface / lcd
      controller combination can sustain
    # maximum: 2048*2048*60
    maximum: 251658240

  max-width:
    $ref: /schemas/types.yaml#/definitions/uint32
    description:
      The maximum horizontal pixel width supported by the lcd controller.
    maximum: 2048

  max-pixelclock:
    $ref: /schemas/types.yaml#/definitions/uint32
    description:
      The maximum pixel clock that can be supported by the lcd controller
      in KHz.

  blue-and-red-wiring:
    enum: [straight, crossed]
    description:
      This property deals with the LCDC revision 2 (found on AM335x)
      color errata [1].
       - "straight" indicates normal wiring that supports RGB565,
         BGR888, and XBGR8888 color formats.
       - "crossed" indicates wiring that has blue and red wires
         crossed. This setup supports BGR565, RGB888 and XRGB8888
         formats.
       - If the property is not present or its value is not recognized
         the legacy mode is assumed. This configuration supports RGB565,
         RGB888 and XRGB8888 formats. However, depending on wiring, the red
         and blue colors are swapped in either 16 or 24-bit color modes.

       [1] There is an errata about AM335x color wiring. For 16-bit color
       mode the wires work as they should (LCD_DATA[0:4] is for Blue[3:7]),
       but for 24 bit color modes the wiring of blue and red components is
       crossed and LCD_DATA[0:4] is for Red[3:7] and LCD_DATA[11:15] is
       for Blue[3-7]. For more details see section 3.1.1 in AM335x
       Silicon Errata
       https://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=sprz360

required:
  - compatible
  - interrupts
  - reg
  - port

additionalProperties: false

examples:
  - |
    display-controller@4830e000 {
        compatible = "ti,am33xx-tilcdc";
        reg = <0x4830e000 0x1000>;
        interrupt-parent = <&intc>;
        interrupts = <36>;
        ti,hwmods = "lcdc";

        blue-and-red-wiring = "crossed";

        port {
            endpoint {
                remote-endpoint = <&hdmi_0>;
            };
        };
    };