linux-kernel - Re: [PATCH 1/2] dt-bindings: ufs: qcom: allow 'dma-coherent' property

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Date:   Mon, 5 Dec 2022 17:29:06 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Johan Hovold <johan+linaro@...nel.org>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Bart Van Assche <bvanassche@....org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: ufs: qcom: allow 'dma-coherent' property

On Mon, Dec 05, 2022 at 11:08:36AM +0100, Johan Hovold wrote:
> UFS controllers may be cache coherent and must be marked as such in the
> devicetree to avoid data corruption.
> 
> This is specifically needed on recent Qualcomm platforms like SC8280XP.
> 
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---
>  Documentation/devicetree/bindings/ufs/qcom,ufs.yaml | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml b/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml
> index f2d6298d926c..1f1d286749c0 100644
> --- a/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml
> +++ b/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml
> @@ -44,6 +44,8 @@ properties:
>      minItems: 8
>      maxItems: 11
>  
> +  dma-coherent: true
> +

This property is not applicable to all SoCs. So setting true here will make it
valid for all.

Thanks,
Mani

>    interconnects:
>      minItems: 2
>      maxItems: 2
> -- 
> 2.37.4
> 

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