dt-bindings: display: renesas,cmm: Add R-Car CMM documentation

# SPDX-License-Identifier: GPL-2.0-only

%YAML 1.2

---

$id: http://devicetree.org/schemas/display/renesas,cmm.yaml#

$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Renesas R-Car Color Management Module (CMM)

maintainers:

  - Laurent Pinchart <laurent.pinchart@ideasonboard.com>

  - Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

  - Jacopo Mondi <jacopo+renesas@jmondi.org>

description: |+

  Renesas R-Car color management module connected to R-Car DU video channels.

  It provides image enhancement functions such as 1-D look-up tables (LUT),

  3-D look-up tables (CLU), 1D-histogram generation (HGO), and color

  space conversion (CSC).

properties:

  compatible:

    oneOf:

      - items:

        - enum:

          - renesas,r8a7795-cmm

          - renesas,r8a7796-cmm

          - renesas,r8a77965-cmm

          - renesas,r8a77990-cmm

          - renesas,r8a77995-cmm

        - const: renesas,rcar-gen3-cmm

      - items:

        - const: renesas,rcar-gen2-cmm

  reg:

    maxItems: 1

  clocks:

    maxItems: 1

  resets:

    maxItems: 1

  power-domains:

    maxItems: 1

required:

  - compatible

  - reg

  - clocks

  - resets

  - power-domains

additionalProperties: false

examples:

  - |

    #include <dt-bindings/clock/r8a7796-cpg-mssr.h>

    #include <dt-bindings/power/r8a7796-sysc.h>

    cmm0: cmm@fea40000 {

         compatible = "renesas,r8a7796-cmm",

                      "renesas,rcar-gen3-cmm";

         reg = <0 0xfea40000 0 0x1000>;

         power-domains = <&sysc R8A7796_PD_ALWAYS_ON>;

         clocks = <&cpg CPG_MOD 711>;

         resets = <&cpg 711>;

    };