linux-kernel - Re: [PATCH v2 2/3] arm64: dts: qcom: hamoa: enable ETR and CTCU devices

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Message-ID: <178f868a-a152-4f2e-87a1-b83b7870777a@oss.qualcomm.com>
Date: Tue, 3 Feb 2026 17:54:27 +0800
From: Jie Gan <jie.gan@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach
 <mike.leach@...aro.org>,
        James Clark <james.clark@...aro.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Tingwei Zhang <tingwei.zhang@....qualcomm.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] arm64: dts: qcom: hamoa: enable ETR and CTCU
 devices



On 2/3/2026 5:50 PM, Jie Gan wrote:
> 
> 
> On 2/3/2026 5:44 PM, Konrad Dybcio wrote:
>> On 2/3/26 10:32 AM, Jie Gan wrote:
>>> Embedded Trace Router(ETR) is working as a DDR memory sink to collect
>>> tracing data from source device.
>>>
>>> The CTCU serves as the control unit for the ETR device, managing its
>>> behavior to determine how trace data is collected.
>>>
>>> Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
>>> Signed-off-by: Jie Gan <jie.gan@....qualcomm.com>
>>> ---
>>>   arch/arm64/boot/dts/qcom/hamoa.dtsi | 160 +++++++++++++++++++++++++ 
>>> ++++++++++-
>>>   1 file changed, 159 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/arch/arm64/boot/dts/qcom/hamoa.dtsi b/arch/arm64/boot/ 
>>> dts/qcom/hamoa.dtsi
>>> index db65c392e618..88ec29446ba1 100644
>>> --- a/arch/arm64/boot/dts/qcom/hamoa.dtsi
>>> +++ b/arch/arm64/boot/dts/qcom/hamoa.dtsi
>>> @@ -6771,6 +6771,35 @@ data-pins {
>>>               };
>>>           };
>>> +        ctcu@...01000 {
>>> +            compatible = "qcom,hamoa-ctcu", "qcom,sa8775p-ctcu";
>>
>> Sorry for not pointing that out explicitly the previous time around,
>> but 'hamoa' also falls under the "had numerical compatibles" category
> 
> I saw the dtsi is renamed to hamoa.dtsi but we still need to use 
> qcom,x1e80100 for hamoa?
> 

I think I was misunderstanding here.

Just checked the compatible for hamoa:
compatible = "qcom,hamoa-iot-evk", "qcom,hamoa-iot-som", "qcom,x1e80100";

I will change it to qcom,x1e80100-ctcu.

Thanks,
Jie

> Thanks,
> Jie
> 
>> (you'll see the only hits for "qcom,hamoa" are "qcom,hamoa-iot-evk"
>> which is a board name)
>>
>> Glymur and Kaanapali are, understandably, Glymur and Kaanapali
>> respectively
>>
>> Konrad
>