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Message-ID: <689714e8-a5bb-7d13-f2f2-ee26b2c53811@nvidia.com>
Date:   Wed, 1 Jul 2020 09:19:54 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Krishna Reddy <vdumpa@...dia.com>, <joro@...tes.org>,
        <will@...nel.org>, <robin.murphy@....com>, <robh+dt@...nel.org>,
        <treding@...dia.com>
CC:     <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <yhsu@...dia.com>,
        <snikam@...dia.com>, <praithatha@...dia.com>, <talho@...dia.com>,
        <bbiswas@...dia.com>, <mperttunen@...dia.com>,
        <nicolinc@...dia.com>, <bhuntsman@...dia.com>,
        <nicoleotsuka@...il.com>
Subject: Re: [PATCH v9 3/4] dt-bindings: arm-smmu: add binding for Tegra194
 SMMU


On 01/07/2020 00:57, Krishna Reddy wrote:
> Add binding for NVIDIA's Tegra194 SoC SMMU topology that is based
> on ARM MMU-500.
> 
> Signed-off-by: Krishna Reddy <vdumpa@...dia.com>
> ---
>  .../devicetree/bindings/iommu/arm,smmu.yaml    | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
> index d7ceb4c34423b..662c46e16f07d 100644
> --- a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
> +++ b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
> @@ -38,6 +38,11 @@ properties:
>                - qcom,sc7180-smmu-500
>                - qcom,sdm845-smmu-500
>            - const: arm,mmu-500
> +      - description: NVIDIA SoCs that use more than one "arm,mmu-500"
> +        items:
> +          - enum:
> +              - nvidia,tegra194-smmu
> +          - const: arm,mmu-500

We should also address Robin's comments here. I don't think that we ever
want to fail back to just the regular 'arm,mmu-500' and should be should
probably just drop this part.

Jon

-- 
nvpublic

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