linux-kernel - Re: [PATCH 1/2] arm64: dts: qcom: sm8350: add missing core_bi_pll_test

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Date:   Wed, 28 Dec 2022 13:26:22 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.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 1/2] arm64: dts: qcom: sm8350: add missing
 core_bi_pll_test_se GCC clock



On 28.12.2022 12:55, Krzysztof Kozlowski wrote:
> On 28/12/2022 12:37, Konrad Dybcio wrote:
>>
>>
>> On 28.12.2022 12:24, Krzysztof Kozlowski wrote:
>>> The GCC bindings expect core_bi_pll_test_se clock input, even if it is
>>> optional:
>>>
>>>   sm8350-mtp.dtb: clock-controller@...000: clock-names:2: 'core_bi_pll_test_se' was expected
>>>
>>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>>> ---
>> Is it even going to be used by anybody, or should we just drop
>> it on the driver side as per usual?
> 
> It's mentioned as possible parent, so there might be users somewhere...
> Or you want to say that other binding and DTS users cannot use that clock?
There's no driver (even downstream) for a supplier of this clock and it's
(probably) only used for early validation by qcom folks. What we're
interested in, as far as debugging clocks goes, is handled by debugcc [1].

Konrad

[1] https://github.com/andersson/debugcc/
> 
> Best regards,
> Krzysztof
>