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[v3,0/3] PCI: qcom: Move PERST# GPIO & phy retrieval from controller to PCIe bridge node

Message ID 20250419-perst-v3-0-1afec3c4ea62@oss.qualcomm.com
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Series PCI: qcom: Move PERST# GPIO & phy retrieval from controller to PCIe bridge node | expand

Message

Krishna Chaitanya Chundru April 19, 2025, 5:19 a.m. UTC 
The main intention of this series is to move wake# to the root port node.
After this series we will come up with a patch which registers for wake IRQ
from the pcieport driver. The wake IRQ is needed for the endpoint to wakeup
the host from D3cold. The driver change for wake IRQ is posted here[1].

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[2] as the
these properties are root port specific and does not belongs to
bridge node.

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, don't remove 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.

Once this series gets merged all other platforms also will be updated
to use this new way.

Note:- The driver change needs to be merged first before dts changes.
Krzysztof Wilczyński or Mani can you provide the immutable branch with
these PCIe changes.

[1] https://lore.kernel.org/all/20250401-wake_irq_support-v1-0-d2e22f4a0efd@oss.qualcomm.com/ 
[2] https://lore.kernel.org/linux-pci/20241211192014.GA3302752@bhelgaas/

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>
---
Changes in v3:
- Make old properties as deprecated, update commit message (Dmitry)
- Add helper functions wherever both multiport and legacy methods are used. (Mani)
- Link to v2: https://lore.kernel.org/r/20250414-perst-v2-0-89247746d755@oss.qualcomm.com

Changes in v2:
- Remove phy-names property and change the driver, dtsi accordingly (Rob)
- Link to v1: https://lore.kernel.org/r/20250322-perst-v1-0-e5e4da74a204@oss.qualcomm.com

---
Krishna Chaitanya Chundru (3):
      dt-bindings: PCI: qcom: Move phy, wake & reset gpio's to root port
      PCI: qcom: Add support for multi-root port
      arm64: qcom: sc7280: Move phy, perst to root port node

 .../devicetree/bindings/pci/qcom,pcie-common.yaml  |  36 ++++-
 .../devicetree/bindings/pci/qcom,pcie-sc7280.yaml  |  16 +-
 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               |   6 +-
 drivers/pci/controller/dwc/pcie-qcom.c             | 169 +++++++++++++++++----
 7 files changed, 202 insertions(+), 40 deletions(-)
---
base-commit: cfb2e2c57aef75a414c0f18445c7441df5bc13be
change-id: 20250101-perst-cb885b5a6129

Best regards,