xref: /kernel/linux/linux-5.10/Documentation/devicetree/bindings/display/allwinner,sun6i-a31-drc.yaml

# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/display/allwinner,sun6i-a31-drc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Allwinner A31 Dynamic Range Controller Device Tree Bindings

maintainers:
  - Chen-Yu Tsai <wens@csie.org>
  - Maxime Ripard <mripard@kernel.org>

description: |
  The DRC (Dynamic Range Controller) allows to dynamically adjust
  pixel brightness/contrast based on histogram measurements for LCD
  content adaptive backlight control.

properties:
  compatible:
    enum:
      - allwinner,sun6i-a31-drc
      - allwinner,sun6i-a31s-drc
      - allwinner,sun8i-a23-drc
      - allwinner,sun8i-a33-drc
      - allwinner,sun9i-a80-drc

  reg:
    maxItems: 1

  interrupts:
    maxItems: 1

  clocks:
    items:
      - description: The DRC interface clock
      - description: The DRC module clock
      - description: The DRC DRAM clock

  clock-names:
    items:
      - const: ahb
      - const: mod
      - const: ram

  resets:
    maxItems: 1

  ports:
    type: object
    description: |
      A ports node with endpoint definitions as defined in
      Documentation/devicetree/bindings/media/video-interfaces.txt.

    properties:
      "#address-cells":
        const: 1

      "#size-cells":
        const: 0

      port@0:
        type: object
        description: |
          Input endpoints of the controller.

      port@1:
        type: object
        description: |
          Output endpoints of the controller.

    required:
      - "#address-cells"
      - "#size-cells"
      - port@0
      - port@1

    additionalProperties: false

required:
  - compatible
  - reg
  - interrupts
  - clocks
  - clock-names
  - resets
  - ports

additionalProperties: false

examples:
  - |
    #include <dt-bindings/interrupt-controller/arm-gic.h>

    #include <dt-bindings/clock/sun6i-a31-ccu.h>
    #include <dt-bindings/reset/sun6i-a31-ccu.h>

    drc0: drc@1e70000 {
        compatible = "allwinner,sun6i-a31-drc";
        reg = <0x01e70000 0x10000>;
        interrupts = <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>;
        clocks = <&ccu CLK_AHB1_DRC0>, <&ccu CLK_IEP_DRC0>,
                 <&ccu CLK_DRAM_DRC0>;
        clock-names = "ahb", "mod",
                      "ram";
        resets = <&ccu RST_AHB1_DRC0>;

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

            drc0_in: port@0 {
                reg = <0>;

                drc0_in_be0: endpoint {
                    remote-endpoint = <&be0_out_drc0>;
                };
            };

            drc0_out: port@1 {
                #address-cells = <1>;
                #size-cells = <0>;
                reg = <1>;

                drc0_out_tcon0: endpoint@0 {
                    reg = <0>;
                    remote-endpoint = <&tcon0_in_drc0>;
                };

                drc0_out_tcon1: endpoint@1 {
                    reg = <1>;
                    remote-endpoint = <&tcon1_in_drc0>;
                };
            };
        };
    };


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