xref: /openbmc/linux/Documentation/devicetree/bindings/display/arm,hdlcd.yaml (revision 84e85359)

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

title: Arm HDLCD display controller

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

description:
  The Arm HDLCD is a display controller found on several development platforms
  produced by ARM Ltd and in more modern of its Fast Models. The HDLCD is an
  RGB streamer that reads the data from a framebuffer and sends it to a single
  digital encoder (DVI or HDMI).

properties:
  compatible:
    const: arm,hdlcd

  reg:
    maxItems: 1

  interrupts:
    maxItems: 1

  clock-names:
    const: pxlclk

  clocks:
    maxItems: 1
    description: The input reference for the pixel clock.

  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.

  iommus:
    maxItems: 1

  port:
    $ref: /schemas/graph.yaml#/properties/port
    unevaluatedProperties: false
    description:
      Output endpoint of the controller, connecting the LCD panel signals.

additionalProperties: false

required:
  - compatible
  - reg
  - interrupts
  - clocks
  - port

examples:
  - |
    hdlcd@2b000000 {
        compatible = "arm,hdlcd";
        reg = <0x2b000000 0x1000>;
        interrupts = <0 85 4>;
        clocks = <&oscclk5>;
        clock-names = "pxlclk";
        port {
            hdlcd_output: endpoint {
                remote-endpoint = <&hdmi_enc_input>;
            };
        };
    };

    /* HDMI encoder on I2C bus */
    i2c {
        #address-cells = <1>;
        #size-cells = <0>;
        hdmi-transmitter@70 {
            compatible = "nxp,tda998x";
            reg = <0x70>;
            port {
                hdmi_enc_input: endpoint {
                    remote-endpoint = <&hdlcd_output>;
                };
            };
        };
    };
...