linux-kernel - Re: [PATCH v2 1/3] dt-bindings: phy: qcom,qmp: Add PCIe qcom,refclk-always-on property

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Date:   Wed, 8 Nov 2023 15:52:11 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Krishna chaitanya chundru <quic_krichai@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        quic_vbadigan@...cinc.com, quic_ramkri@...cinc.com,
        quic_nitegupt@...cinc.com, quic_skananth@...cinc.com,
        quic_vpernami@...cinc.com, quic_parass@...cinc.com
Subject: Re: [PATCH v2 1/3] dt-bindings: phy: qcom,qmp: Add PCIe
 qcom,refclk-always-on property

On Tue, Nov 07, 2023 at 03:01:47PM +0200, Dmitry Baryshkov wrote:
> On Tue, 7 Nov 2023 at 14:26, Krishna chaitanya chundru
> <quic_krichai@...cinc.com> wrote:
> >
> > Document qcom,refclk-always-on property which is needed in some platforms
> > to supply refclk even in PCIe low power states.
> >
> > Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
> > ---
> >  .../devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml        | 7 +++++++
> >  1 file changed, 7 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml
> > index 2c3d6553a7ba..263291447a5b 100644
> > --- a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml
> > +++ b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml
> > @@ -93,6 +93,13 @@ properties:
> >    "#phy-cells":
> >      const: 0
> >
> > +  qcom,refclk-always-on:
> > +    type: boolean
> > +    description: If there is some issues in platform with clkreq signal
> 
> nit: there are some
> 
> However this still doesn't describe what kind of issues with clkreq
> you observe. I mean, clkreq is just a GPIO pin.
> 
> > +      propagation to the host and due to that host will not send refclk, which
> > +      results in linkdown in L1.2 or L1.1 exit initiated by EP. This property
> > +      if set keeps refclk always on even in Low power states (optional).

Dimitry's issues with the property aside, putting "(optional)" in the
description is meaningless - qcom,refclk-always-on isn't listed in the
required properties section, so therefore has to be optional.

Cheers,
Conor.

> > +
> >  required:
> >    - compatible
> >    - reg
> >
> > --
> > 2.42.0
> >
> >
> 
> 
> -- 
> With best wishes
> Dmitry

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