linux-kernel - Re: [PATCH v3 1/6] dt-bindings: PCI: Add binding for qps615

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Message-ID: <20241230182201.4nem2dvg4lg5vdjv@thinkpad>
Date: Mon, 30 Dec 2024 23:52:01 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Krishna Chaitanya Chundru <quic_krichai@...cinc.com>,
	Rob Herring <robh@...nel.org>, andersson@...nel.org,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	cros-qcom-dts-watchers@...omium.org,
	Jingoo Han <jingoohan1@...il.com>,
	Bartosz Golaszewski <brgl@...ev.pl>, quic_vbadigan@...cinc.com,
	linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/6] dt-bindings: PCI: Add binding for qps615

On Mon, Dec 23, 2024 at 08:57:37PM +0200, Dmitry Baryshkov wrote:

[...]

> > This switch allows us to configure both upstream, downstream ports and
> > also embedded Ethernet port which is internal to the switch. These
> > properties are applicable for all of those.
> > > > +
> > > > +    allOf:
> > > > +      - $ref: /schemas/pci/pci-bus.yaml#
> > > 
> > > pci-pci-bridge.yaml is more specific and closer to what this device is.
> > > 
> > I tried this now, I was getting warning saying the compatible
> > /local/mnt/workspace/skales/kobj/Documentation/devicetree/bindings/pci/qcom,qps615.example.dtb:
> > pcie@0,0: compatible: ['pci1179,0623'] does not contain items matching the
> > given schema
> >         from schema $id: http://devicetree.org/schemas/pci/qcom,qps615.yaml#
> > /local/mnt/workspace/skales/kobj/Documentation/devicetree/bindings/pci/qcom,qps615.example.dtb:
> > pcie@0,0: Unevaluated properties are not allowed ('#address-cells',
> > '#size-cells', 'bus-range', 'device_type', 'ranges' were unexpected)
> > 
> > I think pci-pci-bridge is expecting the compatible string in this format
> > only "pciclass,0604".
> 
> I think the pci-pci-bridge schema requires to have "pciclass,0604" among
> other compatibles. So you should be able to do something like:
> 
> compatible = "pci1179,0623", "pciclass,0604";
> 

Even though a PCIe switch is supposed to be a network of PCI bridges, using
PCI bridge fallback for this switch is not technically correct IMO. Mostly
because, this switch requires other configurations which are not applicable to
PCI bridges. So the drivers matching against the bridge compatible won't be able
to use this switch.

- Mani

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