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dt-bindings: display: msm: document the SM8[345]50 displayport MDSS subnode

Document the displayport subnode to fix the bindings check error:

arch/arm64/boot/dts/qcom/sm8550-mtp.dtb: display-subsystem@ae00000: Unevaluated properties are not allowed ('displayport-controller@ae90000' was unexpected)
        From schema: Documentation/devicetree/bindings/display/msm/qcom,sm8550-mdss.yaml

And same for SM8350 and SM8450.

To: Rob Clark <robdclark@gmail.com>
To: Abhinav Kumar <quic_abhinavk@quicinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
To: Sean Paul <sean@poorly.run>
To: Marijn Suijten <marijn.suijten@somainline.org>
To: David Airlie <airlied@gmail.com>
To: Daniel Vetter <daniel@ffwll.ch>
To: Rob Herring <robh+dt@kernel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
To: Conor Dooley <conor+dt@kernel.org>
To: Robert Foss <rfoss@kernel.org>
Cc: linux-arm-msm@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: freedreno@lists.freedesktop.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

---
Changes in v2:
- Removed duplicate "document" in commit messages
- Added review trailers
- Link to v1: https://lore.kernel.org/r/20230621-topic-sm8x50-upstream-mdss-bindings-dp-subnode-v1-0-8bf386b373eb@linaro.org

---
Neil Armstrong (3):
      dt-bindings: display: msm: sm8350-mdss: document displayport controller subnode
      dt-bindings: display: msm: sm8450-mdss: document displayport controller subnode
      dt-bindings: display: msm: sm8550-mdss: document displayport controller subnode

 .../devicetree/bindings/display/msm/qcom,sm8350-mdss.yaml         | 6 ++++++
 .../devicetree/bindings/display/msm/qcom,sm8450-mdss.yaml         | 8 ++++++++
 .../devicetree/bindings/display/msm/qcom,sm8550-mdss.yaml         | 8 ++++++++
 3 files changed, 22 insertions(+)
---
base-commit: 15e71592dbae49a674429c618a10401d7f992ac3
change-id: 20230621-topic-sm8x50-upstream-mdss-bindings-dp-subnode-4fe367bf5cbe

Best regards,