linux-kernel - Re: [PATCH v4 0/2] PCI: qcom: Move PERST# GPIO & phy retrieval from controller to PCIe bridge node

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Message-ID: <4bae822e-e7bd-461f-99cc-866771c0b954@oss.qualcomm.com>
Date: Mon, 30 Jun 2025 18:00:12 +0530
From: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
To: Manivannan Sadhasivam <mani@...nel.org>
Cc: Lorenzo Pieralisi <lpieralisi@...nel.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,
        Krzysztof Wilczyński <kwilczynski@...nel.org>,
        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
Subject: Re: [PATCH v4 0/2] PCI: qcom: Move PERST# GPIO & phy retrieval from
 controller to PCIe bridge node



On 6/23/2025 4:37 PM, Manivannan Sadhasivam wrote:
> On Thu, Jun 05, 2025 at 02:00:36PM +0530, Krishna Chaitanya Chundru wrote:
>> 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.
>>
> 
> You've dropped the DTS changes in this revision. So the above comment is stale.
> 
>> [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/
>>
> 
> I don't have a device to test this series right now. So could you please test
> this series with the legacy binding and make sure it is not breaking?
> 
> Once you confirm, I'll merge this series.
> 
I have verified with legacy binding with this change and it is working fine.

- Krishna Chaitanya.
> - Mani
> 
>> Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
>> ---
>> Changes in v4:
>> - Removed dts patch as Mani suggested to merge driver and dt-binding
>>    patch in this release and have dts changes in the next release.
>> - Remove wake property from as this will be addressed in
>>    pci-bus-common.yaml (Mani)
>> - Did couple of nits in the comments, function names code etc (Mani).
>> - Link to v3: https://lore.kernel.org/r/20250419-perst-v3-0-1afec3c4ea62@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 (2):
>>        dt-bindings: PCI: qcom: Move phy & reset gpio's to root port
>>        PCI: qcom: Add support for multi-root port
>>
>>   .../devicetree/bindings/pci/qcom,pcie-common.yaml  |  32 +++-
>>   .../devicetree/bindings/pci/qcom,pcie-sc7280.yaml  |  16 +-
>>   drivers/pci/controller/dwc/pcie-qcom.c             | 177 +++++++++++++++++----
>>   3 files changed, 192 insertions(+), 33 deletions(-)
>> ---
>> base-commit: ec7714e4947909190ffb3041a03311a975350fe0
>> change-id: 20250101-perst-cb885b5a6129
>>
>> Best regards,
>> -- 
>> krishnachaitanya-linux <krishna.chundru@....qualcomm.com>
>>
>