linux-kernel - Re: [PATCH v4 2/2] arm64: dts: qcom: Add base QDU1000/QRU1000 IDP DTs

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Date:   Thu, 15 Dec 2022 10:53:42 -0800
From:   Melody Olvera <quic_molvera@...cinc.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>
CC:     Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 2/2] arm64: dts: qcom: Add base QDU1000/QRU1000 IDP DTs



On 12/15/2022 10:47 AM, Dmitry Baryshkov wrote:
> On 15/12/2022 19:56, Melody Olvera wrote:
>>
>>
>> On 12/15/2022 12:44 AM, Krzysztof Kozlowski wrote:
>>> On 14/12/2022 19:59, Melody Olvera wrote:
>>>>>> +            #clock-cells = <0>;
>>>>>> +        };
>>>>>> +
>>>>>> +        sleep_clk: sleep-clk {
>>>>>> +            compatible = "fixed-clock";
>>>>>> +            clock-frequency = <32000>;
>>>>>> +            #clock-cells = <0>;
>>>>>> +        };
>>>>>> +
>>>>>> +        pcie_0_pipe_clk: pcie-0-pipe-clk {
>>>>> Afaict these clocks are not referenced anywhere, so please skip them.
>>>> Yes, so I included them to be consistent with the bindings. They will be needed later;
>>>> should I still remove?
>>>>
>>> If they are not referenced anywhere, how is it consistent with bindings?
>>> Where do the bindings require defining such nodes?
>>
>> These bindings here: https://lore.kernel.org/all/20221118181826.28269-2-quic_molvera@quicinc.com/
>> I believe you commented that we either have these clocks or we don't, correct? I added them to
>> the dt since these clocks exist and will be needed later when USB and PCIE nodes are added.
>> As Konrad noted, these technically belong in the PHYs, but I was told to put stub fixed
>> clocks instead here: https://lore.kernel.org/lkml/2c8c4642-8aee-3da3-7698-5e08b4c5894d@linaro.org/
>>
>> How is this to be handled? Should I remove the clocks from the dt and the bindings and add them
>> later when we need them? Do I leave stub clocks here with frequency 0 until needed? I am
>> very confused right now.
>
> You were told to use stub clocks in the bindings, not in the dtsi file. You can use <0> in the dtsi instead.

Oh ok that makes more sense. I appreciate the clarification.

Thanks,
Melody
>
>>
>> Thanks,
>> Melody
>>
>>>
>>> Best regards,
>>> Krzysztof
>>>
>>
>