linux-kernel - [PATCH v9 0/2] arm64: dts: qcom: Add support for 4 pixel streams

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Message-Id: <20250916-dp_mst_bindings-v9-0-68c674b39d8e@oss.qualcomm.com>
Date: Tue, 16 Sep 2025 20:18:27 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Luca Weiss <luca.weiss@...rphone.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        cros-qcom-dts-watchers@...omium.org
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Jessica Zhang <jessica.zhang@....qualcomm.com>
Subject: [PATCH v9 0/2] arm64: dts: qcom: Add support for 4 pixel streams

On some MSM chipsets, the display port controller is capable of supporting
up to 4 streams.

To drive these additional streams, the pixel clocks for the corresponding
stream needs to be enabled.

Fixup the documentation of some of the bindings to clarify exactly which
stream they correspond to, then add the new bindings and device tree
changes.

---
Changes in v9:
- Dropped patches applied to drm/msm
- Link to v8: https://lore.kernel.org/r/20250903-dp_mst_bindings-v8-0-7526f0311eaa@oss.qualcomm.com

Changes in v8:
- Expanded commit messages in order to describe that SM6350-related
  change is not going to break platform support (Krzysztof).
- Also added restrictions to clock-names properties (Krzysztof).
- Link to v7: https://lore.kernel.org/r/20250829-dp_mst_bindings-v7-0-2b268a43917b@oss.qualcomm.com

Changes in v7:
- Changed fallback compatible for SM6350, it doesn't have MST
- Reworked MST schema in order to remove nested ifs (Krzysztof)
- Didn't pick up Rob's R-B tag since the patch was heavily reworked
- Added P2 / P3 / MST2LINK / MST3LINK regions
- Link to v6: https://lore.kernel.org/r/20250815-dp_mst_bindings-v6-0-e715bbbb5386@oss.qualcomm.com

Changes in v6:
- Switched platforms with different MST configrations to use single
  properties entry instead of using oneOf (Rob)
- Link to v5: https://lore.kernel.org/r/20250809-dp_mst_bindings-v5-0-b185fe574f38@oss.qualcomm.com

Changes in v5:
- Removed SC7280-related comments, it has no DP MST support
- Link to v4: https://lore.kernel.org/r/20250809-dp_mst_bindings-v4-0-bb316e638284@oss.qualcomm.com

Changes in v4:
- Picked up series from Jessica by the mutual agreement
- Corrected Rob's tags (Krzysztof)
- Split X1E80100 DP patch (Dmitry)
- Removed SC7280 changes
- Enabled the MST clock on SDM845
- Link to v3: https://lore.kernel.org/r/20250717-dp_mst_bindings-v3-0-72ce08285703@oss.qualcomm.com

Changes in v3:
- Fixed dtschema errors (Rob Herring)
- Documented all pixel stream clocks (Dmitry)
- Ordered compatibility list alphabetically (Dmitry)
- Dropped assigned-clocks too (Dmitry)
- Link to v2: https://lore.kernel.org/r/20250530-dp_mst_bindings-v2-0-f925464d32a8@oss.qualcomm.com

Changes in v2:
- Rebased on top of next-20250523
- Dropped merged maintainer patch
- Added a patch to make the corresponding dts change to add pixel 1
  stream
- Squashed pixel 0 and pixel 1 stream binding patches (Krzysztof)
- Drop assigned-clock-parents bindings for dp-controller (Krzysztof)
- Updated dp-controller.yaml to include all chipsets that support stream
  1 pixel clock (Krzysztof)
- Added missing minItems and if statement (Krzysztof)
- Link to v1: https://lore.kernel.org/r/20241202-dp_mst_bindings-v1-0-9a9a43b0624a@quicinc.com

---
Dmitry Baryshkov (1):
      arm64: dts: qcom: sm6350: correct DP compatibility strings

Jessica Zhang (1):
      arm64: dts: qcom: Add MST pixel streams for displayport

 arch/arm64/boot/dts/qcom/lemans.dtsi   | 46 +++++++++++++++++-----
 arch/arm64/boot/dts/qcom/sar2130p.dtsi | 10 +++--
 arch/arm64/boot/dts/qcom/sc7280.dtsi   |  3 +-
 arch/arm64/boot/dts/qcom/sc8180x.dtsi  | 23 +++++++----
 arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 72 +++++++++++++++++++++++-----------
 arch/arm64/boot/dts/qcom/sdm845.dtsi   | 15 +++++--
 arch/arm64/boot/dts/qcom/sm6350.dtsi   |  2 +-
 arch/arm64/boot/dts/qcom/sm8150.dtsi   | 10 +++--
 arch/arm64/boot/dts/qcom/sm8250.dtsi   | 10 +++--
 arch/arm64/boot/dts/qcom/sm8350.dtsi   | 10 +++--
 arch/arm64/boot/dts/qcom/sm8450.dtsi   | 10 +++--
 arch/arm64/boot/dts/qcom/sm8550.dtsi   | 10 +++--
 arch/arm64/boot/dts/qcom/sm8650.dtsi   | 10 +++--
 arch/arm64/boot/dts/qcom/x1e80100.dtsi | 30 +++++++++-----
 14 files changed, 186 insertions(+), 75 deletions(-)
---
base-commit: 05af764719214d6568adb55c8749dec295228da8
change-id: 20241202-dp_mst_bindings-7536ffc9ae2f

Best regards,
-- 
With best wishes
Dmitry