linux-kernel - Re: [PATCH] dt-bindings: PCI: host-generic-pci: Allow IOMMU and MSI properties

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Message-ID: <CAL_JsqL37RQqGv6ZB5uxsnPFoUjKPh6uc7_SWpaqDJqvWAF4Dg@mail.gmail.com>
Date:   Tue, 2 Aug 2022 16:21:49 -0600
From:   Rob Herring <robh@...nel.org>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Will Deacon <will@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        PCI <linux-pci@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dt-bindings: PCI: host-generic-pci: Allow IOMMU and MSI properties

On Tue, Aug 2, 2022 at 3:26 AM Robin Murphy <robin.murphy@....com> wrote:
>
> On 2022-07-28 18:51, Rob Herring wrote:
> > Allow 'iommu-map', 'iommu-map-mask', and 'msi-parent' properties for
> > generic host. This fixes unevaluated property warnings on Arm Juno, AMD
> > Seattle, and FSL LS1028a.
> >
> > Signed-off-by: Rob Herring <robh@...nel.org>
> > ---
> >   Documentation/devicetree/bindings/pci/host-generic-pci.yaml | 3 +++
> >   1 file changed, 3 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/pci/host-generic-pci.yaml b/Documentation/devicetree/bindings/pci/host-generic-pci.yaml
> > index 6bcaa8f2c3cf..d25423aa7167 100644
> > --- a/Documentation/devicetree/bindings/pci/host-generic-pci.yaml
> > +++ b/Documentation/devicetree/bindings/pci/host-generic-pci.yaml
> > @@ -106,6 +106,9 @@ properties:
> >       maxItems: 3
> >
> >     dma-coherent: true
> > +  iommu-map: true
> > +  iommu-map-mask: true
> > +  msi-parent: true
>
> Hmm, in general this set looks suspiciously incomplete without msi-map
> and msi-map-mask too. Am I right in thinking that the ideal thing to do
> here would be to convert pci-msi.txt and pci-iommu.txt to schema and
> $ref them?

I already added msi-map/msi-map-mask to pci-bus.yaml[1] as well as
schemas for iommu-map/iommu-map-mask[2] and msi-parent[3]. Since
msi-map is already in the referenced schema, it is allowed here.
msi-parent is separate because it is used elsewhere. iommu-map is
separate largely to make copying pci-iommu.txt as-is easier.

And yes, pci-iommu.txt can now be removed. pci-msi.txt is more
complicated as all of it hasn't been moved into schemas.

Rob

[1] https://github.com/devicetree-org/dt-schema/commit/109bde712466281e8c96a4fadb0f68e7a90a6eca
[2] https://github.com/devicetree-org/dt-schema/commit/3d44bf2b46a9ac638550ca3916d7d7f70823bb58
[3] https://github.com/devicetree-org/dt-schema/commit/59f2e3103b6e776afe4f42e45897f7eabae06fa4