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

[Krzysztof Kozlowski]

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:".

> 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.

Best regards,
Krzysztof