linux-kernel - Re: [PATCH 04/14] dt-bindings: PCI: pci-ep: Document 'linux,pci-domain' property

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Message-ID: <20240716040540.GB3446@thinkpad>
Date: Tue, 16 Jul 2024 09:35:40 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
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>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>, linux-pci@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 04/14] dt-bindings: PCI: pci-ep: Document
 'linux,pci-domain' property

On Mon, Jul 15, 2024 at 09:59:12PM +0200, Konrad Dybcio wrote:
> On 15.07.2024 7:33 PM, Manivannan Sadhasivam via B4 Relay wrote:
> > From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > 
> > 'linux,pci-domain' property provides the PCI domain number for the PCI
> > endpoint controllers in a SoC. If this property is not present, then an
> > unstable (across boots) unique number will be assigned.
> > 
> > Devicetrees can specify the domain number based on the actual hardware
> > instance of the PCI endpoint controllers in the SoC.
> > 
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> 
> Hm, perhaps pci-controller-common.yaml could make sense here?
> 

For RC, this property is defined in 'pci-host-bridge.yaml' which is hosted in
dtschema repo. And the description of this property varies between host and
endpoint, so we cannot use a common one. TBH, endpoint doesn't really need
_this_ property as there is no PCIe domain here. But I used this one since it
already exist and does the job pretty well.

- Mani

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