Re: [PATCH v2 1/2] dt-bindings: media: qcom,sm8550-iris: Allow IOVA reservation memory-region

[Dmitry Baryshkov]

On Sun, Jun 14, 2026 at 10:51:11PM +0800, Daniel J Blueman wrote:
> In addition to the firmware-loaded codec carveout, some Iris platforms
> need to declare an IOMMU IOVA reservation (a reserved-memory node with
> iommu-addresses) to keep DMA away from IOVA ranges that earlier
> firmware stages have already mapped through the SMMU.
> 
> Permit a second memory-region phandle for this purpose, and describe
> the meaning of each entry so the ordering is unambiguous.

With no driver changes?

> 
> Fixes: 9065340ac04d ("arm64: dts: qcom: x1e80100: Add IRIS video codec")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Daniel J Blueman <daniel@xxxxxxxxx>
> ---
> v2:
> - drop redundant maxItems, keeping the items descriptions (Rob)
> - add Fixes tag and Cc stable for the backport dependency
> v1: https://lore.kernel.org/lkml/20260601041336.9497-1-daniel@xxxxxxxxx/
> 
>  .../devicetree/bindings/media/qcom,sm8550-iris.yaml          | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/media/qcom,sm8550-iris.yaml b/Documentation/devicetree/bindings/media/qcom,sm8550-iris.yaml
> index 9c4b760508b5..5abcaee4101c 100644
> --- a/Documentation/devicetree/bindings/media/qcom,sm8550-iris.yaml
> +++ b/Documentation/devicetree/bindings/media/qcom,sm8550-iris.yaml
> @@ -80,7 +80,10 @@ properties:
>    dma-coherent: true
>  
>    memory-region:
> -    maxItems: 1
> +    minItems: 1
> +    items:
> +      - description: Firmware-loaded codec carveout
> +      - description: IOMMU IOVA reservation region
>  
>    operating-points-v2: true
>  
> -- 
> 2.53.0
> 

-- 
With best wishes
Dmitry