linux-kernel - Re: [PATCH 1/3] dt-binding: document QCOM platforms for CTCU device

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Message-ID: <5911fe77-fe2c-4321-96a9-a1b6b3b5d1e3@arm.com>
Date: Tue, 3 Feb 2026 09:31:55 +0000
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Jie Gan <jie.gan@....qualcomm.com>,
 Konrad Dybcio <konrad.dybcio@....qualcomm.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 1/3] dt-binding: document QCOM platforms for CTCU device

On 03/02/2026 09:00, Jie Gan wrote:
> 
> 
> On 2/3/2026 4:50 PM, Konrad Dybcio wrote:
>> On 2/3/26 9:08 AM, Jie Gan wrote:
>>> Document the platforms that fallback to using the qcom,sa8775p-ctcu
>>> compatible for probing.
>>>
>>> Signed-off-by: Jie Gan <jie.gan@....qualcomm.com>
>>> ---
>>>   Documentation/devicetree/bindings/arm/qcom,coresight-ctcu.yaml | 4 
>>> ++++
>>>   1 file changed, 4 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/arm/qcom,coresight- 
>>> ctcu.yaml b/Documentation/devicetree/bindings/arm/qcom,coresight- 
>>> ctcu.yaml
>>> index e002f87361ad..68853db52bef 100644
>>> --- a/Documentation/devicetree/bindings/arm/qcom,coresight-ctcu.yaml
>>> +++ b/Documentation/devicetree/bindings/arm/qcom,coresight-ctcu.yaml
>>> @@ -29,6 +29,10 @@ properties:
>>>       oneOf:
>>>         - items:
>>>             - enum:
>>> +              - qcom,glymur-ctcu
>>> +              - qcom,hamoa-ctcu
>>> +              - qcom,kaanapali-ctcu
>>> +              - qcom,pakala-ctcu
>>
>> Platforms with existing numeric compatibles should continue to use them,
>> so that the mess is somewhat containable
> 
> Sure Konrad. So for Pakala, I will change it back to qcom,sm8750-ctcu

Why do we need different compatibles for the others ? Are they not all 
compliant to the CTCU programming model ? i.e., sa8775p-ctcu ? or even,
a generic,

qcom,coresight-ctcu

Suzuki



> 
> Thanks,
> Jie
> 
>>
>> Konrad
>