xref: /freebsd/sys/contrib/device-tree/Bindings/display/st,stm32mp25-lvds.yaml (revision 0e8011faf58b743cc652e3b2ad0f7671227610df)

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/display/st,stm32mp25-lvds.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: STMicroelectronics STM32 LVDS Display Interface Transmitter

maintainers:
  - Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
  - Yannick Fertre <yannick.fertre@foss.st.com>

description: |
  The STMicroelectronics STM32 LVDS Display Interface Transmitter handles the
  LVDS protocol: it maps the pixels received from the upstream Pixel-DMA (LTDC)
  onto the LVDS PHY.

  It is composed of three sub blocks:
    - LVDS host: handles the LVDS protocol (FPD / OpenLDI) and maps its input
      pixels onto the data lanes of the PHY
    - LVDS PHY: parallelize the data and drives the LVDS data lanes
    - LVDS wrapper: handles top-level settings

  The LVDS controller driver supports the following high-level features:
    - FDP-Link-I and OpenLDI (v0.95) protocols
    - Single-Link or Dual-Link operation
    - Single-Display or Double-Display (with the same content duplicated on both)
    - Flexible Bit-Mapping, including JEIDA and VESA
    - RGB888 or RGB666 output
    - Synchronous design, with one input pixel per clock cycle

properties:
  compatible:
    const: st,stm32mp25-lvds

  "#clock-cells":
    const: 0
    description:
      Provides the internal LVDS PHY clock to the framework.

  reg:
    maxItems: 1

  clocks:
    items:
      - description: APB peripheral clock
      - description: Reference clock for the internal PLL

  clock-names:
    items:
      - const: pclk
      - const: ref

  resets:
    maxItems: 1

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

    properties:
      port@0:
        $ref: /schemas/graph.yaml#/properties/port
        description:
          LVDS input port node, connected to the LTDC RGB output port.

      port@1:
        $ref: /schemas/graph.yaml#/properties/port
        description:
          LVDS output port node, connected to a panel or bridge input port.

    required:
      - port@0
      - port@1

required:
  - compatible
  - "#clock-cells"
  - reg
  - clocks
  - clock-names
  - resets
  - ports

additionalProperties: false

examples:
  - |
    #include <dt-bindings/clock/st,stm32mp25-rcc.h>
    #include <dt-bindings/reset/st,stm32mp25-rcc.h>

    lvds: lvds@48060000 {
        compatible = "st,stm32mp25-lvds";
        reg = <0x48060000 0x2000>;
        #clock-cells = <0>;
        clocks = <&rcc CK_BUS_LVDS>, <&rcc CK_KER_LVDSPHY>;
        clock-names = "pclk", "ref";
        resets = <&rcc LVDS_R>;

        ports {
            #address-cells = <1>;
            #size-cells = <0>;

            port@0 {
                reg = <0>;
                lvds_in: endpoint {
                   remote-endpoint = <&ltdc_ep1_out>;
                };
            };

            port@1 {
                reg = <1>;
                lvds_out0: endpoint {
                   remote-endpoint = <&lvds_panel_in>;
                };
            };
        };
    };

...