linux-kernel - Re: [PATCH v5] dt-bindings: PCI: altera: Convert to YAML

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Date: Fri, 17 May 2024 14:56:19 -0500
From: Rob Herring <robh@...nel.org>
To: matthew.gerlach@...ux.intel.com
Cc: linux-kernel@...r.kernel.org, conor+dt@...nel.org,
	lpieralisi@...nel.org, krzysztof.kozlowski+dt@...aro.org,
	kw@...ux.com, bhelgaas@...gle.com, linux-pci@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v5] dt-bindings: PCI: altera: Convert to YAML

On Tue, May 14, 2024 at 11:30:05AM -0700, matthew.gerlach@...ux.intel.com wrote:
> 
> 
> On Tue, 14 May 2024, Rob Herring wrote:
> 
> > > > 
> > > 
> > > My bot found errors running 'make dt_binding_check' on your patch:
> > > 
> > > yamllint warnings/errors:
> > > 
> > > dtschema/dtc warnings/errors:
> > > /builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/pci/altr,pcie-root-port.example.dtb: pcie@...000000: interrupt-map: [[0, 0, 0, 1, 2, 1, 0, 0, 0], [2, 2, 2, 0, 0, 0, 3, 2, 3], [0, 0, 0, 4, 2, 4]] is too short
> > > 	from schema $id: http://devicetree.org/schemas/altr,pcie-root-port.yaml#
> > 
> > You need 3 address cells after the phandles since the interrupt parent
> > has 3 address cells.
> 
> Thanks for the extra explanation. Adding 3 address cells of 0 made the
> warning go away.
> 
> > 
> > What does your actual DT contain and do interrupts work because
> > interrupts never would have worked I think? Making the PCI host the
> > interrupt parent didn't even work in the kernel until somewhat recently
> > (maybe a few years now). That's why a bunch of PCI hosts have an
> > interrupt-controller child node.
> 
> The following DT snippet comes from
> https://www.rocketboards.org/foswiki/Projects/Stratix10PCIeRootPortWithMSI
> 
> The Linux kernel version is 4.14.130-ltsi. Would the use of the msi-parent
> node make everything work?

Possibly? I would think MSIs are preferred and almost anything should 
support MSIs now.

Rob