[PATCH v2 0/6] PCI: qcom-ep: Add PCIe Endpoint support for Monaco

[Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>]

This series adds PCIe Endpoint mode support for the Monaco (QCS8300)
SoC, which has two PCIe controllers capable of operating as Endpoints.

- Patch 1 documents the dedicated 16 GT/s x4 QMP PCIe PHY compatible
  for QCS8300, correcting an earlier gap where this PHY variant had no
  QCS8300-specific compatible of its own.
- Patch 2 documents the QCS8300 compatible for the PCIe Endpoint
  controller binding, with SA8775P as its fallback.
- Patch 3 adds the corresponding Endpoint PHY register configuration
  to the QMP PCIe PHY driver, reusing the existing SA8775P programming
  for the 16 GT/s x2 PHY and adding a new configuration for the 16
  GT/s x4 PHY.
- Patch 4 fixes clock-enable ordering in the qcom-ep controller driver:
  some platforms require the interconnect bandwidth vote to be set
  before enabling clocks, otherwise certain clocks can get stuck off.
- Patch 5 fixes the existing pcie1_phy node's compatible string to
  list the new QCS8300-specific compatible first, ahead of the
  SA8775P fallback, matching the order used elsewhere in this series.
- Patch 6 adds the Endpoint device tree nodes for both Monaco PCIe
  controllers, covering register regions, clocks, interrupts,
  interconnects, IOMMU mappings, resets, power domains, and PHY
  connections.

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>
---
Changes in v2:
  -  dt-bindings: PCI: qcom-ep: Drop qcs8300 compatible from the standalone
    enum list(Krzysztof)
  - PCI: qcom-ep: Fix qcom_pcie_disable_resources() to tear down resources
    in strict LIFO order (phy -> clocks -> interconnect bandwidth),
    matching the enable path's error-unwind sequence. (Sashiko AI review)
  - arm64: qcom: monaco: Add reset-gpios and wake-gpios to the pcie0_ep and
    pcie1_ep nodes so the EP driver owns and correctly manages the PERST#
    and WAKE# lines; drop the output-low override from the wake-pins
    pinctrl state that was permanently asserting WAKE#. (Sashiko AI review)
  - phy: qcom: qmp-pcie: Reword commit message to clarify the new RX
    tuning sequence for the 16 GT/s x4 PHY is common to RC and EP modes,
    not EP-only.
- Link to v1: https://patch.msgid.link/20260921-monaco_ep-v1-0-63c5282fb0db@oss.qualcomm.com

---
Krishna Chaitanya Chundru (6):
      dt-bindings: phy: qcom,sc8280xp-qmp-pcie-phy: Add qcs8300 16 GT/s PHY
      dt-bindings: PCI: qcom-ep: Add QCS8300 compatible
      phy: qcom: qmp-pcie: Add endpoint PHY configuration for QCS8300
      PCI: qcom-ep: Set initial interconnect bandwidth before enabling clocks
      arm64: qcom: monaco: Fix pcie1_phy compatible to list qcs8300 first
      arm64: qcom: monaco: Add PCIe Endpoint nodes

 .../devicetree/bindings/pci/qcom,pcie-ep.yaml      |   4 +
 .../bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml   |  87 ++++++------
 arch/arm64/boot/dts/qcom/monaco.dtsi               | 150 ++++++++++++++++++++-
 drivers/pci/controller/dwc/pcie-qcom-ep.c          |  36 ++---
 drivers/phy/qualcomm/phy-qcom-qmp-pcie.c           | 105 +++++++++++++++
 5 files changed, 322 insertions(+), 60 deletions(-)
---
base-commit: 0927a1e73df63eda38bb120b91e50d746d640e17
change-id: 20260918-monaco_ep-fb14fafd0ecc

Best regards,
--  
Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>