Re: [PATCH 1/3] dt-bindings: media: qcom,qcm2290-venus: document shikra Iris compatible

[Bryan O'Donoghue <bod@kernel.org>]

On 09/06/2026 17:15, Vikash Garodia wrote:
> Document the iris video accelerator used on shikra platforms by adding
> the qcom,shikra-iris compatible.
> 
> Although QCM2290 and shikra share the same video hardware and overall
> integration, their SMMU programming differs. QCM2290 exposes separate
> stream IDs for the video hardware and the Xtensa path, requiring two
> explicit IOMMU entries, whereas shikra uses a masked SMR to collapse
> equivalent stream IDs into a single mapping. Due to QCM2290’s SID layout
> and Xtensa isolation requirements, such SMR masking is not applicable on
> QCM2290 platforms.
> Since shikra uses the same video hardware as QCM2290 and shares the same
> programming model and capabilities, it is added as a fallback compatible
> to qcom,qcm2290-venus, with conditional handling to allow either one or
> two IOMMU entries.
> 
> Signed-off-by: Vikash Garodia <vikash.garodia@oss.qualcomm.com>
> ---
>   .../bindings/media/qcom,qcm2290-venus.yaml           | 20 ++++++++++++++++----
>   1 file changed, 16 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/media/qcom,qcm2290-venus.yaml b/Documentation/devicetree/bindings/media/qcom,qcm2290-venus.yaml
> index 5977e7d0a71b4fb5681f1c2094439c251366f01f..895533b9756690d075fd7729e3f805c8e72ff0df 100644
> --- a/Documentation/devicetree/bindings/media/qcom,qcm2290-venus.yaml
> +++ b/Documentation/devicetree/bindings/media/qcom,qcm2290-venus.yaml
> @@ -15,12 +15,27 @@ description:
> 
>   allOf:
>     - $ref: qcom,venus-common.yaml#
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: qcom,shikra-iris

Should this be "iris" in a venus yaml ?

> +    then:
> +      properties:
> +        iommus:
> +          maxItems: 1
> +    else:
> +      properties:
> +        iommus:
> +          maxItems: 2
> 
>   properties:
>     compatible:
>       oneOf:
>         - items:
> -          - const: qcom,sm6115-venus
> +          - enum:
> +              - qcom,sm6115-venus
> +              - qcom,shikra-iris
>             - const: qcom,qcm2290-venus
>         - const: qcom,qcm2290-venus
> 
> @@ -45,9 +60,6 @@ properties:
>         - const: vcodec0_core
>         - const: vcodec0_bus
> 
> -  iommus:
> -    maxItems: 2
> -
>     interconnects:
>       maxItems: 2
> 
> 
> --
> 2.34.1
> 

---
bod