linux-kernel - RE: [PATCH v10 4/5] dt-bindings: arm-smmu: add binding for Tegra194 SMMU

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Message-ID: <BYAPR12MB2822514F93F831507A811EE9B3650@BYAPR12MB2822.namprd12.prod.outlook.com>
Date:   Fri, 10 Jul 2020 20:29:55 +0000
From:   Krishna Reddy <vdumpa@...dia.com>
To:     Rob Herring <robh@...nel.org>, Robin Murphy <robin.murphy@....com>
CC:     "joro@...tes.org" <joro@...tes.org>,
        "will@...nel.org" <will@...nel.org>,
        "robin.murphy@....com" <robin.murphy@....com>,
        Thierry Reding <treding@...dia.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        Yu-Huan Hsu <YHsu@...dia.com>,
        Sachin Nikam <Snikam@...dia.com>,
        Pritesh Raithatha <praithatha@...dia.com>,
        Timo Alho <talho@...dia.com>,
        Bitan Biswas <bbiswas@...dia.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        Nicolin Chen <nicolinc@...dia.com>,
        Bryan Huntsman <bhuntsman@...dia.com>,
        "nicoleotsuka@...il.com" <nicoleotsuka@...il.com>
Subject: RE: [PATCH v10 4/5] dt-bindings: arm-smmu: add binding for Tegra194
 SMMU

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