Documentation/devicetree/bindings/display/mediatek/mediatek,padding.yaml

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

title: MediaTek Display Padding

maintainers:
  - Chun-Kuang Hu <chunkuang.hu@kernel.org>
  - Philipp Zabel <p.zabel@pengutronix.de>

description:
  Padding provides ability to add pixels to width and height of a layer with
  specified colors. Due to hardware design, Mixer in VDOSYS1 requires
  width of a layer to be 2-pixel-align, or 4-pixel-align when ETHDR is enabled,
  we need Padding to deal with odd width.
  Please notice that even if the Padding is in bypass mode, settings in
  register must be cleared to 0, or undefined behaviors could happen.

properties:
  compatible:
    oneOf:
      - enum:
          - mediatek,mt8188-disp-padding
          - mediatek,mt8195-mdp3-padding
      - items:
          - const: mediatek,mt8188-mdp3-padding
          - const: mediatek,mt8195-mdp3-padding

  reg:
    maxItems: 1

  power-domains:
    maxItems: 1

  clocks:
    items:
      - description: Padding's clocks

  mediatek,gce-client-reg:
    description:
      GCE (Global Command Engine) is a multi-core micro processor that helps
      its clients to execute commands without interrupting CPU. This property
      describes GCE client's information that is composed by 4 fields.
      1. Phandle of the GCE (there may be several GCE processors)
      2. Sub-system ID defined in the dt-binding like a user ID
         (Please refer to include/dt-bindings/gce/<chip>-gce.h)
      3. Offset from base address of the subsys you are at
      4. Size of the register the client needs
    $ref: /schemas/types.yaml#/definitions/phandle-array
    items:
      items:
        - description: Phandle of the GCE
        - description: Subsys ID defined in the dt-binding
        - description: Offset from base address of the subsys
        - description: Size of register
    maxItems: 1

required:
  - compatible
  - reg
  - power-domains
  - clocks
  - mediatek,gce-client-reg

additionalProperties: false

examples:
  - |
    #include <dt-bindings/interrupt-controller/arm-gic.h>
    #include <dt-bindings/clock/mediatek,mt8188-clk.h>
    #include <dt-bindings/power/mediatek,mt8188-power.h>
    #include <dt-bindings/gce/mt8195-gce.h>

    soc {
        #address-cells = <2>;
        #size-cells = <2>;

        padding0: padding@1c11d000 {
            compatible = "mediatek,mt8188-disp-padding";
            reg = <0 0x1c11d000 0 0x1000>;
            clocks = <&vdosys1 CLK_VDO1_PADDING0>;
            power-domains = <&spm MT8188_POWER_DOMAIN_VDOSYS1>;
            mediatek,gce-client-reg = <&gce0 SUBSYS_1c11XXXX 0xd000 0x1000>;
        };
    };