linux-kernel - Re: [PATCH v3 1/3] dt-bindings: phy: qcom,qmp: Add PCIe qcom,refclk-always-on property

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Date:   Tue, 28 Nov 2023 14:49:18 +0530
From:   Krishna Chaitanya Chundru <quic_krichai@...cinc.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        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>
CC:     <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 v3 1/3] dt-bindings: phy: qcom,qmp: Add PCIe
 qcom,refclk-always-on property


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@...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..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.

- Krishna Chaitanya.

>
> Best regards,
> Krzysztof