Re: [PATCH 1/2] dt-bindings: iommu: arm,smmu: Document optional interconnects property

[Bibek Kumar Patro]

On 5/18/2026 6:03 PM, Krzysztof Kozlowski wrote:
> On Sat, May 16, 2026 at 06:04:03PM +0530, Bibek Kumar Patro wrote:
> > Some SoC implementations require a bandwidth vote on an interconnect
>
> Then this should be disallowed for other devices in "allOf:".

As of now, we still are checking which all SoCs do not need this 
interconnects field. So would we need to add the allOf here for now?

> > path before the SMMU register space is accessible. Add the optional
> > 'interconnects' property to the binding to allow platform DT nodes
> > to describe this path.
> >
> > The arm-smmu driver uses these properties to vote for bandwidth before
> > accessing any SMMU registers and releases the vote on runtime suspend.
> >
> > Signed-off-by: Bibek Kumar Patro <bibek.patro@xxxxxxxxxxxxxxxx>
> > ---
> >   Documentation/devicetree/bindings/iommu/arm,smmu.yaml | 9 +++++++++
> >   1 file changed, 9 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
> > index 06fb5c8e7547cb7a92823adc2772b94f747376a6..5cbf944f2d3e178b3723d4dbaa19ee0d33446979 100644
> > --- a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
> > +++ b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
> > @@ -243,6 +243,15 @@ properties:
> >       minItems: 1
> >       maxItems: 3
> >   
> > +  interconnects:
> > +    maxItems: 1
> > +    description:
> > +      Optional interconnect path to the SMMU register space. On some SoCs
> > +      the SMMU registers are only accessible after a bandwidth vote has been
>
> Drivers are irrelevant here, drop. Also first sentence is redundant.
> Schema says what is and what is not optional.

Sure, got it. I will remove the "driver" quotation and "optional"
wording from both binding description and commit text.

Thanks & regards,
Bibek

> Best regards,
> Krzysztof