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

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Message-ID: <Y43e9KRDsTCS5VI4@hovoldconsulting.com>
Date:   Mon, 5 Dec 2022 13:07:16 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     Johan Hovold <johan+linaro@...nel.org>,
        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 05:29:06PM +0530, Manivannan Sadhasivam wrote:
> 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.

Yes, it would be a valid, but it will only be added to the DTs of SoCs
that actually require it. No need to re-encode the dtsi in the binding.

Johan