linux-kernel - Re: [PATCH v3 1/6] dt-bindings: phy: qcom,qmp-usb3-dp: Add support for SM8250

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Date:   Fri, 26 Mar 2021 20:44:13 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Manu Gautam <mgautam@...eaurora.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 1/6] dt-bindings: phy: qcom,qmp-usb3-dp: Add support
 for SM8250

On Fri, 26 Mar 2021 at 04:20, Rob Herring <robh@...nel.org> wrote:
>
> On Thu, Mar 18, 2021 at 10:59:25PM +0300, Dmitry Baryshkov wrote:
> > Add compatible for SM8250 in QMP USB3 DP PHY bindings.
> >
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> > ---
> >  Documentation/devicetree/bindings/phy/qcom,qmp-phy.yaml         | 1 -
> >  Documentation/devicetree/bindings/phy/qcom,qmp-usb3-dp-phy.yaml | 2 ++
> >  2 files changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/devicetree/bindings/phy/qcom,qmp-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,qmp-phy.yaml
> > index 626447fee092..c558aa605b9d 100644
> > --- a/Documentation/devicetree/bindings/phy/qcom,qmp-phy.yaml
> > +++ b/Documentation/devicetree/bindings/phy/qcom,qmp-phy.yaml
> > @@ -38,7 +38,6 @@ properties:
> >        - qcom,sm8250-qmp-gen3x1-pcie-phy
> >        - qcom,sm8250-qmp-gen3x2-pcie-phy
> >        - qcom,sm8250-qmp-modem-pcie-phy
> > -      - qcom,sm8250-qmp-usb3-phy
>
> Why is this being moved? Not sure what the differences between the 2
> bindings, but doesn't seem like a backwards compatible change.

Hmm. I followed the existing schemas, but they are incorrect. It looks
like the commit 724fabf5df13 ("dt-bindings: phy: qcom,qmp-usb3-dp: Add
DP phy information") has introduced backwards-incompatible change,
which is not followed by the current kernel device trees. I'd proposed
to move qcom,sc7180-qmp-usb3-phy and qcom,sdm845-qmp-usb3-phy back to
bindings/phy/qcom,qmp-phy.yaml (as those device nodes do not use DP
serdes block, etc).

I'll include the fix into v4 of this series.

>
> >        - qcom,sm8250-qmp-usb3-uni-phy
> >        - qcom,sm8350-qmp-ufs-phy
> >        - qcom,sm8350-qmp-usb3-phy
> > diff --git a/Documentation/devicetree/bindings/phy/qcom,qmp-usb3-dp-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,qmp-usb3-dp-phy.yaml
> > index 33974ad10afe..9792cc567cb5 100644
> > --- a/Documentation/devicetree/bindings/phy/qcom,qmp-usb3-dp-phy.yaml
> > +++ b/Documentation/devicetree/bindings/phy/qcom,qmp-usb3-dp-phy.yaml
> > @@ -17,6 +17,8 @@ properties:
> >        - qcom,sc7180-qmp-usb3-phy
> >        - qcom,sdm845-qmp-usb3-dp-phy
> >        - qcom,sdm845-qmp-usb3-phy
> > +      - qcom,sm8250-qmp-usb3-dp-phy
> > +      - qcom,sm8250-qmp-usb3-phy
> >    reg:
> >      items:
> >        - description: Address and length of PHY's USB serdes block.
> > --
> > 2.30.2
> >



-- 
With best wishes
Dmitry