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    Subject[PATCH v6 1/6] dt-bindings: display: add Unisoc's drm master bindings
    Date
    From: Kevin Tang <kevin.tang@unisoc.com>

    The Unisoc DRM master device is a virtual device needed to list all
    DPU devices or other display interface nodes that comprise the
    graphics subsystem

    Unisoc's display pipeline have several components as below
    description, multi display controllers and corresponding physical
    interfaces.
    For different display scenarios, dpu0 and dpu1 maybe binding to
    different encoder.

    E.g:
    dpu0 and dpu1 both binding to DSI for dual mipi-dsi display;
    dpu0 binding to DSI for primary display, and dpu1 binding to DP for
    external display;

    Cc: Orson Zhai <orsonzhai@gmail.com>
    Cc: Chunyan Zhang <zhang.lyra@gmail.com>
    Signed-off-by: Kevin Tang <kevin.tang@unisoc.com>
    Reviewed-by: Rob Herring <robh@kernel.org>
    ---
    .../display/sprd/sprd,display-subsystem.yaml | 64 +++++++++++++++++++
    1 file changed, 64 insertions(+)
    create mode 100644 Documentation/devicetree/bindings/display/sprd/sprd,display-subsystem.yaml

    diff --git a/Documentation/devicetree/bindings/display/sprd/sprd,display-subsystem.yaml b/Documentation/devicetree/bindings/display/sprd/sprd,display-subsystem.yaml
    new file mode 100644
    index 000000000..3d107e943
    --- /dev/null
    +++ b/Documentation/devicetree/bindings/display/sprd/sprd,display-subsystem.yaml
    @@ -0,0 +1,64 @@
    +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
    +%YAML 1.2
    +---
    +$id: http://devicetree.org/schemas/display/sprd/sprd,display-subsystem.yaml#
    +$schema: http://devicetree.org/meta-schemas/core.yaml#
    +
    +title: Unisoc DRM master device
    +
    +maintainers:
    + - Kevin Tang <kevin.tang@unisoc.com>
    +
    +description: |
    + The Unisoc DRM master device is a virtual device needed to list all
    + DPU devices or other display interface nodes that comprise the
    + graphics subsystem.
    +
    + Unisoc's display pipeline have several components as below description,
    + multi display controllers and corresponding physical interfaces.
    + For different display scenarios, dpu0 and dpu1 maybe binding to different
    + encoder.
    +
    + E.g:
    + dpu0 and dpu1 both binding to DSI for dual mipi-dsi display;
    + dpu0 binding to DSI for primary display, and dpu1 binding to DP for external display;
    +
    + +-----------------------------------------+
    + | |
    + | +---------+ |
    + +----+ | +----+ +---------+ |DPHY/CPHY| | +------+
    + | +----->+dpu0+--->+MIPI|DSI +--->+Combo +----->+Panel0|
    + |AXI | | +----+ +---------+ +---------+ | +------+
    + | | | ^ |
    + | | | | |
    + | | | +-----------+ |
    + | | | | |
    + |APB | | +--+-+ +-----------+ +---+ | +------+
    + | +----->+dpu1+--->+DisplayPort+--->+PHY+--------->+Panel1|
    + | | | +----+ +-----------+ +---+ | +------+
    + +----+ | |
    + +-----------------------------------------+
    +
    +properties:
    + compatible:
    + const: sprd,display-subsystem
    +
    + ports:
    + $ref: /schemas/types.yaml#/definitions/phandle-array
    + description:
    + Should contain a list of phandles pointing to display interface port
    + of DPU devices.
    +
    +required:
    + - compatible
    + - ports
    +
    +additionalProperties: false
    +
    +examples:
    + - |
    + display-subsystem {
    + compatible = "sprd,display-subsystem";
    + ports = <&dpu_out>;
    + };
    +
    --
    2.29.0
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