linux-kernel - [PATCH v5 0/2] Add firmware-managed PCIe Endpoint support for SA8255P

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Message-Id: <20260106-firmware_managed_ep-v5-0-1933432127ec@oss.qualcomm.com>
Date: Tue, 06 Jan 2026 18:04:44 +0530
From: Mrinmay Sarkar <mrinmay.sarkar@....qualcomm.com>
To: Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kwilczynski@...nel.org>,
        Manivannan Sadhasivam <mani@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Bjorn Andersson <andersson@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>,
        Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>,
        quic_vbadigan@...cinc.com, quic_shazhuss@...cinc.com,
        konrad.dybcio@....qualcomm.com,
        Mrinmay sarkar <mrinmay.sarkar@....qualcomm.com>,
        Rama Krishna <quic_ramkri@...cinc.com>,
        Ayiluri Naga Rashmi <quic_nayiluri@...cinc.com>,
        Nitesh Gupta <quic_nitegupt@...cinc.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
Subject: [PATCH v5 0/2] Add firmware-managed PCIe Endpoint support for
 SA8255P

This patch series introduces support for Qualcomm SA8255P platform
where PCIe Endpoint resources are managed by firmware instead of
Linux driver. So the Linux driver should avoid redundant resource
management and relies on runtime PM calls to inform firmware for
resource management.

And document the new compatible string "qcom,sa8255p-pcie-ep" for
SA8255P platform in the device tree bindings.

Tested on Qualcomm SA8255P platform.

Signed-off-by: Mrinmay Sarkar <mrinmay.sarkar@....qualcomm.com>
---
Changes in v5:
- Added Reviewed-by tag in dt-binding patch.
- Updated patch 2 as per comment by Mani.
- Link to v4: https://lore.kernel.org/r/20251223-firmware_managed_ep-v4-0-7f7c1b83d679@oss.qualcomm.com

Changes in v4:
- Updated compatible string.
- Updated dt binding file name to match with compatible.
- Link to v3: https://lore.kernel.org/r/20251217-firmware_managed_ep-v3-0-ff871ba688fb@oss.qualcomm.com

Changes in v3:
- Updated compatible string in dt binding example node.
- Link to v2: https://lore.kernel.org/r/20251216-firmware_managed_ep-v2-0-7a731327307f@oss.qualcomm.com

Changes in v2:
- Updated dt binding as suggested by Krzysztof.
- Updated compatible string to match file name and compatible.
- Updated driver as suggested by bjorn.
- Link to v1: https://lore.kernel.org/r/20251203-firmware_managed_ep-v1-0-295977600fa5@oss.qualcomm.com

---
Mrinmay Sarkar (2):
      dt-bindings: PCI: qcom,sa8255p-pcie-ep: Document firmware managed PCIe endpoint
      PCI: qcom-ep: Add support for firmware-managed PCIe Endpoint

 .../bindings/pci/qcom,sa8255p-pcie-ep.yaml         | 110 +++++++++++++++++++++
 drivers/pci/controller/dwc/pcie-qcom-ep.c          |  61 ++++++++++--
 2 files changed, 163 insertions(+), 8 deletions(-)
---
base-commit: 563c8dd425b59e44470e28519107b1efc99f4c7b
change-id: 20251216-firmware_managed_ep-ff5d51846558

Best regards,
-- 
Mrinmay Sarkar <mrinmay.sarkar@....qualcomm.com>