linux-kernel - Re: [PATCH v3 0/3] PCI: qcom: Move PERST# GPIO & phy retrieval from controller to PCIe bridge node

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Message-ID: <7vw5pftnbiixxkokaebidfnjfs3nk6xoa7yaxxwmsssilfqnua@5qlbhqsiuojv>
Date: Sun, 1 Jun 2025 12:39:47 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>, 
	Krzysztof Wilczyński <kw@...ux.com>, 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, 
	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 v3 0/3] PCI: qcom: Move PERST# GPIO & phy retrieval from
 controller to PCIe bridge node

On Sat, Apr 19, 2025 at 10:49:23AM +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.
> 

Since there could be other patches for Qcom driver in the PCI tree, I don't
prefer immutable branch. Let's first merge the driver and binding patches
through PCI tree and you can submit the dts changes for rest of the platforms
for the next cycle.

- Mani

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