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Date:   Fri, 1 Dec 2023 11:37:16 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
To:     Krishna Chaitanya Chundru <quic_krichai@quicinc.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Vinod Koul <vkoul@kernel.org>,
        Kishon Vijay Abraham I <kishon@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        quic_vbadigan@quicinc.com, quic_ramkri@quicinc.com,
        quic_nitegupt@quicinc.com, quic_skananth@quicinc.com,
        quic_vpernami@quicinc.com, quic_parass@quicinc.com
Subject: Re: [PATCH v3 1/3] dt-bindings: phy: qcom,qmp: Add PCIe
 qcom,refclk-always-on property
Message-ID: <20231201060716.GJ4009@thinkpad>
References: <20231127-refclk_always_on-v3-0-26d969fa8f1d@quicinc.com>
 <20231127-refclk_always_on-v3-1-26d969fa8f1d@quicinc.com>
 <78815f1b-7390-40de-8afd-ac71806f4051@linaro.org>
 <24fae40a-453b-b14c-923f-88758a246aa7@quicinc.com>
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On Tue, Nov 28, 2023 at 02:49:18PM +0530, Krishna Chaitanya Chundru wrote:
> 
> On 11/28/2023 2:26 PM, Krzysztof Kozlowski wrote:
> > On 27/11/2023 13:13, Krishna chaitanya chundru 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@quicinc.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..c747c9f35795 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: In some platform where PCIe switch is connected, pcie switch due to some design
> > You received a comment to use proper wrapping: 80. Please implement it.
> I will update this.
> > > +      limitation fails to propage clkreq signal 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.
> > The property name suggests that's the state of hardware - refclk is
> > always on. Description suggests you want to instruct OS to do something.
> > 
> > Again, third time (once from Bjorn, once from Dmitry), rephrase property
> > name and description to describe the hardware issue. I see description
> > improved, but not the property name. Again in the end of description you
> 
> Both bjorn and Dmitry gave comments to change the description only, and not
> the property name,
> 
> correct if I am wrong.
> 
> > say what Linux should do. Bindings do not describe Linux OS.
> 
> I will remove the last line in the next patch.
> 

You should name the property as, "qcom,keep-refclk-always-on"

Also, no need to stuff the binding with "why this property is required", that
info should be part of the patch description. Just describe what this property
means in binding.

- Mani

> - Krishna Chaitanya.
> 
> > 
> > Best regards,
> > Krzysztof
> 

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