linux-kernel - Re: [PATCH v4 2/2] arm64: dts: qcom: qcs615: Add CPU scaling clock node

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Message-ID: <66c71817-442c-4a7b-8d10-48e6751c8e2f@oss.qualcomm.com>
Date: Fri, 27 Jun 2025 15:35:30 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Taniya Das <quic_tdas@...cinc.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Ajit Pandey <quic_ajipan@...cinc.com>,
        Imran Shaik <quic_imrashai@...cinc.com>,
        Jagadeesh Kona <quic_jkona@...cinc.com>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/2] arm64: dts: qcom: qcs615: Add CPU scaling clock
 node

On 27/06/2025 06:52, Taniya Das wrote:
> 
> 
> On 6/25/2025 5:06 PM, Dmitry Baryshkov wrote:
>> On Wed, Jun 25, 2025 at 04:44:01PM +0530, Taniya Das wrote:
>>> Add cpufreq-hw node to support CPU frequency scaling.
>>>
>>> Signed-off-by: Taniya Das <quic_tdas@...cinc.com>
>>> ---
>>>   arch/arm64/boot/dts/qcom/qcs615.dtsi | 29 +++++++++++++++++++++++++++++
>>>   1 file changed, 29 insertions(+)
>>>
>>> @@ -3891,6 +3907,19 @@ glink_edge: glink-edge {
>>>   				qcom,remote-pid = <2>;
>>>   			};
>>>   		};
>>> +
>>> +		cpufreq_hw: cpufreq@...23000 {
>>> +			compatible = "qcom,sc7180-cpufreq-hw", "qcom,cpufreq-hw";
>>
>> Why? Other platforms use a true SoC as the first entry.
>>
> Dmitry, from cpufreq-hw perspective SC7180 is a exact match for QCS615
> and that was the reason to use the same.

Please look around. A quick `git grep` would show that every SoC uses 
SoC-specific compatible (although some of them are definitely 
compatible). The reason is pretty simple: each platform might have 
SoC-specific tunings and quirks.

-- 
With best wishes
Dmitry