[PATCH v3 2/5] dt-bindings: iommu: mediatek: Fix interrupt count constraint for new SoCs

[Krzysztof Kozlowski]

On Fri, Sep 27, 2024 at 02:50:38PM +0800, Macpaul Lin wrote:
> The infra-iommu node in mt8195.dtsi was triggering a CHECK_DTBS error due
> to an excessively long 'interrupts' property. The error message was:
> 
>   infra-iommu at 10315000: interrupts: [[0, 795, 4, 0], [0, 796, 4, 0],
>                      [0, 797, 4, 0], [0, 798, 4, 0], [0, 799, 4, 0]]
>                      is too long
> 
> To address this issue, update the compatbile matching rule for
> 'interrupts' property. This change allows flexibility in the number
> of interrupts for new SoCs like MT8195.
> The purpose of these 5 interrupts is also added into description.
> 
> Fixes: bca28426805d ("dt-bindings: iommu: mediatek: Convert IOMMU to DT schema")
> Signed-off-by: Macpaul Lin <macpaul.lin at mediatek.com>
> ---
>  .../bindings/iommu/mediatek,iommu.yaml        | 25 ++++++++++++++++++-
>  1 file changed, 24 insertions(+), 1 deletion(-)
> 
> Changes for v2:
>  - commit message: re-formatting and add a description of adding 5 interrupts.
>  - add 'description' and 'maxItems: 5' for 'interrupt' property of
>    'mt8195-iommu-infra'
>  - others keeps 'maxItems: 1'
> 
> Changes for v3:
>  - Refine the description for 'interrupts' property and fixes the compatible
>    matching rules.
>  - Refine commit message.
> 
> diff --git a/Documentation/devicetree/bindings/iommu/mediatek,iommu.yaml b/Documentation/devicetree/bindings/iommu/mediatek,iommu.yaml
> index ea6b0f5f24de..10e2bb0f0704 100644
> --- a/Documentation/devicetree/bindings/iommu/mediatek,iommu.yaml
> +++ b/Documentation/devicetree/bindings/iommu/mediatek,iommu.yaml
> @@ -96,7 +96,13 @@ properties:
>      maxItems: 1
>  
>    interrupts:
> -    maxItems: 1

This does not make sense and was not here at v2. Keep constraints at top
level.

This is how variable-length lists are created:
https://elixir.bootlin.com/linux/v6.11-rc6/source/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml#L127

Best regards,
Krzysztof