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

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Date:   Mon, 27 Nov 2023 17:19:05 +0530
From:   Krishna Chaitanya Chundru <quic_krichai@...cinc.com>
To:     Conor Dooley <conor@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC:     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 11/8/2023 9:22 PM, Conor Dooley wrote:
> 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.

I removed the optional flag and updated the description.

- Krishna chaitanya.

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