linux-kernel - Re: [PATCH v10 07/13] dt-bindings: arm-smmu: Add compatible string for Adreno GPU SMMU

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Message-ID: <CAF6AEGu50KtjFHJO3Txrbjnn1xoG5WDyuU_e__RsGPXe-5Z46g@mail.gmail.com>
Date:   Sun, 26 Jul 2020 09:55:18 -0700
From:   Rob Clark <robdclark@...il.com>
To:     Jordan Crouse <jcrouse@...eaurora.org>
Cc:     linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Rob Herring <robh@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        Robin Murphy <robin.murphy@....com>,
        "list@....net:IOMMU DRIVERS <iommu@...ts.linux-foundation.org>, Joerg
        Roedel <joro@...tes.org>," <iommu@...ts.linux-foundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Will Deacon <will@...nel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v10 07/13] dt-bindings: arm-smmu: Add compatible string
 for Adreno GPU SMMU

On Mon, Jul 20, 2020 at 8:41 AM Jordan Crouse <jcrouse@...eaurora.org> wrote:
>
> Every Qcom Adreno GPU has an embedded SMMU for its own use. These

minor detail: this is true for a3xx and later but not a2xx ;-)

> devices depend on unique features such as split pagetables,
> different stall/halt requirements and other settings. Identify them
> with a compatible string so that they can be identified in the
> arm-smmu implementation specific code.
>
> Signed-off-by: Jordan Crouse <jcrouse@...eaurora.org>
> Reviewed-by: Rob Herring <robh@...nel.org>
> ---
>
>  Documentation/devicetree/bindings/iommu/arm,smmu.yaml | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
> index d7ceb4c34423..e52a1b146c97 100644
> --- a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
> +++ b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
> @@ -38,6 +38,10 @@ properties:
>                - qcom,sc7180-smmu-500
>                - qcom,sdm845-smmu-500
>            - const: arm,mmu-500
> +      - description: Qcom Adreno GPUs implementing "arm,smmu-v2"
> +        items:
> +          - const: qcom,adreno-smmu
> +          - const: qcom,smmu-v2
>        - items:
>            - const: arm,mmu-500
>            - const: arm,smmu-v2
> --
> 2.25.1
>
> _______________________________________________
> iommu mailing list
> iommu@...ts.linux-foundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/iommu

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