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From: Krishna Reddy <vdumpa@nvidia.com>
To: Rob Herring <robh@kernel.org>, Robin Murphy <robin.murphy@arm.com>
Subject: RE: [PATCH v10 4/5] dt-bindings: arm-smmu: add binding for Tegra194
 SMMU
Thread-Topic: [PATCH v10 4/5] dt-bindings: arm-smmu: add binding for Tegra194
 SMMU
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Sender: "iommu" <iommu-bounces@lists.linux-foundation.org>

Thanks Rob. One question on setting "minItems: ". Please see below.

>> +allOf:
>> +  - if:
>> +      properties:
>> +        compatible:
>> +          contains:
>> +            enum:
>> +              - nvidia,tegra194-smmu
>> +    then:
>> +      properties:
>> +        reg:
>> +          minItems: 2
>> +          maxItems: 2

>This doesn't work. The main part of the schema already said there's only
>1 reg region. This part is ANDed with that, not an override. You need to add an else clause with 'maxItems: 1' and change the base schema to
>{minItems: 1, maxItems: 2}.

As the earlier version of base schema doesn't have "minItems: " set, should it be set to 0 for backward compatibility?  Or can it just be omitted setting in base schema as before?

"else" part to set "maxItems: 1" and setting "maxItems: 2" in base schema is clear to me.


-KR
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