linux-kernel - Re: [PATCH v3 03/17] dt-bindings: qcom-bam: Add 'iommus' to required properties

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Message-ID: <YKdrMoSFAh1bR3xT@gerhold.net>
Date:   Fri, 21 May 2021 10:11:30 +0200
From:   Stephan Gerhold <stephan@...hold.net>
To:     Bhupesh Sharma <bhupesh.sharma@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org,
        Thara Gopinath <thara.gopinath@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Vinod Koul <vkoul@...nel.org>, dmaengine@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-crypto@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        bhupesh.linux@...il.com
Subject: Re: [PATCH v3 03/17] dt-bindings: qcom-bam: Add 'iommus' to required
 properties

Hi,

On Wed, May 19, 2021 at 08:06:46PM +0530, Bhupesh Sharma wrote:
> Add the missing required property - 'iommus' to the
> device-tree binding documentation for qcom-bam DMA IP.
> 
> This property describes the phandle(s) to apps_smmu node with sid mask.
> 
> Cc: Thara Gopinath <thara.gopinath@...aro.org>
> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Andy Gross <agross@...nel.org>
> Cc: Herbert Xu <herbert@...dor.apana.org.au>
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Stephen Boyd <sboyd@...nel.org>
> Cc: Michael Turquette <mturquette@...libre.com>
> Cc: Vinod Koul <vkoul@...nel.org>
> Cc: dmaengine@...r.kernel.org
> Cc: linux-clk@...r.kernel.org
> Cc: linux-crypto@...r.kernel.org
> Cc: devicetree@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: bhupesh.linux@...il.com
> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> ---
>  .../devicetree/bindings/dma/qcom_bam_dma.yaml         | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml b/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
> index d2900616006c..2479862a3654 100644
> --- a/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
> +++ b/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
> @@ -55,6 +55,12 @@ properties:
>    interconnect-names:
>      const: memory
>  
> +  iommus:
> +    minItems: 1
> +    maxItems: 8
> +    description: |
> +      phandle to apps_smmu node with sid mask.
> +
>    qcom,ee:
>      $ref: /schemas/types.yaml#/definitions/uint8
>      description:
> @@ -81,6 +87,7 @@ required:
>    - clocks
>    - clock-names
>    - "#dma-cells"
> +  - iommus

I don't think we can make this required, older SoCs don't use "iommus"
for bam_dma.

arch/arm64/boot/dts/qcom/apq8016-sbc.dt.yaml: dma-controller@...4000: 'iommus' is a required property
        From schema: Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml

Stephan