[PATCH 1/3] dt-bindings: arm-smmu: Add interconnect for qcom SMMUs

[Konrad Dybcio]

On 9.06.2023 07:41, Parikshit Pareek wrote:
> There are certain SMMUs on qcom SoCs, which need to set interconnect-
> bandwidth, before accessing any MIMO mapped HW registers, and accessing
> RAM during page table walk. Hence introduce the due bindings for
> interconnects.
> 
> Reported-by: Eric Chanudet <echanude at redhat.com>
> Signed-off-by: Parikshit Pareek <quic_ppareek at quicinc.com>
> ---
>  .../devicetree/bindings/iommu/arm,smmu.yaml   | 22 +++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
> index ba677d401e24..75e00789d8c2 100644
> --- a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
> +++ b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
> @@ -327,6 +327,28 @@ allOf:
>              - description: interface clock required to access smmu's registers
>                  through the TCU's programming interface.
>  
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              qcom,sa8775p-smmu-500
> +    then:
> +      properties:
> +        interconnects:
This isn't specific to SA8775P.. I believe we could make it SMMU-generic..

> +          minItems: 1
> +          maxItems: 1
> +
> +        interconnect-names:
> +          minItems: 1
> +          items:
> +            - const: tbu_mc
> +
> +        icc_bw:
No underscores in property names.
> +          $ref: /schemas/types.yaml#/definitions/int32
Can't we use OPP tables? They'd also allow for specifying required-opps.

Konrad
> +          description:
> +            An integer expressing the interconnect bandwidth(MBps) to be set.
> +
>    - if:
>        properties:
>          compatible: