linux-kernel - [PATCH 0/3] PCI: qcom: Move PERST# GPIO & phy retrieval from controller to PCIe bridge node

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Message-Id: <20250322-perst-v1-0-e5e4da74a204@oss.qualcomm.com>
Date: Sat, 22 Mar 2025 08:30:42 +0530
From: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
To: Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        cros-qcom-dts-watchers@...omium.org
Cc: linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        quic_vbadigan@...cinc.com, quic_mrana@...cinc.com,
        Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
Subject: [PATCH 0/3] PCI: qcom: Move PERST# GPIO & phy retrieval from
 controller to PCIe bridge node

There are many places we agreed to move the wake and perst gpio's
and phy etc to the pcie root port node instead of bridge node[1].

So move the phy, phy-names, wake-gpio's in the root port.
There is already reset-gpio defined for PERST# in pci-bus-common.yaml,
start using that property instead of perst-gpio.

For backward compatibility, not removing any existing properties in the
bridge node.

There are some other properties like num-lanes, max-link-speed which
needs to be moved to the root port nodes, but in this series we are
excluding them for now as this requires more changes in dwc layer and
can complicate the things.

The main intention of this series is to move wake# to the root port node.
After this series we wil come up with a patch which regiters for wake IRQ
from the pcieport driver. The wake IRQ is needed for the endpoint to wakeup
the host from D3cold.

[1] https://lore.kernel.org/linux-pci/20241211192014.GA3302752@bhelgaas/

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
---
Krishna Chaitanya Chundru (3):
      dt-bindings: PCI: qcom: Move phy, wake & reset gpio's to root port
      arm64: qcom: sc7280: Move phy, perst to root port node
      PCI: qcom: Add support for multi-root port

 .../devicetree/bindings/pci/qcom,pcie-common.yaml  |  22 +++
 .../devicetree/bindings/pci/qcom,pcie-sc7280.yaml  |  18 ++-
 arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts       |   5 +-
 arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi     |   5 +-
 arch/arm64/boot/dts/qcom/sc7280-idp.dtsi           |   5 +-
 arch/arm64/boot/dts/qcom/sc7280.dtsi               |   7 +-
 drivers/pci/controller/dwc/pcie-qcom.c             | 149 +++++++++++++++++----
 7 files changed, 174 insertions(+), 37 deletions(-)
---
base-commit: 88d324e69ea9f3ae1c1905ea75d717c08bdb8e15
change-id: 20250101-perst-cb885b5a6129

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