linux-kernel - Re: [PATCH v4 1/6] dt-bindings: iommu: qcom,iommu: Add qcom,ctx-num property

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Message-ID: <20230622015017.GA37013-robh@kernel.org>
Date:   Wed, 21 Jun 2023 19:50:17 -0600
From:   Rob Herring <robh@...nel.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        dmitry.baryshkov@...aro.org, joro@...tes.org, will@...nel.org,
        robin.murphy@....com, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, robdclark@...il.com,
        linux-arm-msm@...r.kernel.org, iommu@...ts.linux.dev,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH v4 1/6] dt-bindings: iommu: qcom,iommu: Add qcom,ctx-num
 property

On Tue, Jun 20, 2023 at 11:51:22AM +0200, AngeloGioacchino Del Regno wrote:
> Add a new "qcom,ctx-num" property to force an ASID number on IOMMU
> contexts where required.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
>  Documentation/devicetree/bindings/iommu/qcom,iommu.yaml | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iommu/qcom,iommu.yaml b/Documentation/devicetree/bindings/iommu/qcom,iommu.yaml
> index d9fabdf930d9..0446ccc4116e 100644
> --- a/Documentation/devicetree/bindings/iommu/qcom,iommu.yaml
> +++ b/Documentation/devicetree/bindings/iommu/qcom,iommu.yaml
> @@ -71,6 +71,11 @@ patternProperties:
>        reg:
>          maxItems: 1
>  
> +      qcom,ctx-num:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description:
> +          The ASID number associated to the context bank.

If the value is ASID, then qcom,ctx-asid would be more descriptive.

> +
>      required:
>        - compatible
>        - interrupts
> -- 
> 2.40.1
>