linux-kernel - Re: [PATCH v1 1/2] dt-bindings: arm: coresight: Update the pattern of ete node name

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Date: Fri, 29 Dec 2023 11:21:07 +0800
From: Jinlong Mao <quic_jinlmao@...cinc.com>
To: James Clark <james.clark@....com>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>
CC: <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Tingwei Zhang <quic_tingweiz@...cinc.com>,
        Yuanfang Zhang <quic_yuanfang@...cinc.com>,
        Tao Zhang
	<quic_taozha@...cinc.com>, <coresight@...ts.linaro.org>,
        Mathieu Poirier
	<mathieu.poirier@...aro.org>,
        Mike Leach <mike.leach@...aro.org>, Leo Yan
	<leo.yan@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring
	<robh+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Subject: Re: [PATCH v1 1/2] dt-bindings: arm: coresight: Update the pattern of
 ete node name


On 12/28/2023 7:02 PM, James Clark wrote:
>
> On 26/12/2023 09:36, Krzysztof Kozlowski wrote:
>> On 26/12/2023 02:50, Jinlong Mao wrote:
>>>
>>> On 12/21/2023 4:44 PM, Krzysztof Kozlowski wrote:
>>>> On 21/12/2023 09:36, Jinlong Mao wrote:
>>>>>
>>>>> On 12/21/2023 4:17 PM, Krzysztof Kozlowski wrote:
>>>>>> On 21/12/2023 09:15, Jinlong Mao wrote:
>>>>>>>
>>>>>>> On 12/21/2023 4:12 PM, Krzysztof Kozlowski wrote:
>>>>>>>> On 21/12/2023 04:28, Jinlong Mao wrote:
>>>>>>>>>>> diff --git a/Documentation/devicetree/bindings/arm/arm,embedded-trace-extension.yaml b/Documentation/devicetree/bindings/arm/arm,embedded-trace-extension.yaml
>>>>>>>>>>> index f725e6940993..cbf583d34029 100644
>>>>>>>>>>> --- a/Documentation/devicetree/bindings/arm/arm,embedded-trace-extension.yaml
>>>>>>>>>>> +++ b/Documentation/devicetree/bindings/arm/arm,embedded-trace-extension.yaml
>>>>>>>>>>> @@ -23,7 +23,7 @@ description: |
>>>>>>>>>>>       
>>>>>>>>>>>       properties:
>>>>>>>>>>>         $nodename:
>>>>>>>>>>> -    pattern: "^ete([0-9a-f]+)$"
>>>>>>>>>>> +    pattern: "^ete-([0-9a-f]+)$"
>>>>>>>>>> My concerns are not resolved. Why is it here in the first place?
>>>>>>>>> Hi Krzysztof,
>>>>>>>>>
>>>>>>>>> ETE is acronym of embedded trace extension. The number of the name is
>>>>>>>>> the same as the number of the CPU it belongs to.
>>>>>>>> This is obvious and was not my question.
>> You already said it here...
>>
>>>>>>> Do you mean why the pattern match of the node name is added here ?
>>>>>> Yes, especially that it is requiring a non-generic name.
>>>>>>
>>>>>>> This node should not have the node name match, right ?
>>>>>> Usually. For sure shouldn't be for non-generic names.
>>>>>>
>>>>> Hi Suzuki,
>>>>>
>>>>> Can we remove the pattern match of the node name and use a generic name
>>>>> "ete" for the ete DT nodes ?
>>>> "ete" is not a generic name. What is generic here? It's an acronym of
>>>> some specific device name.
>>>>
>>> The device full name is embedded trace extension. So use ETE as the name
>>> here.
>> That's obvious and my comment was not about it. Second time... This is
>> my unlucky day... I said, why do you even want to enforce name which is
>> not generic, since the names should be generic?
>>
> I think we can just drop the enforced name if it's getting in the way.
> It doesn't really do anything and other Coresight bindings don't have it
> anyway.
>
>> I assume you read the DT specification:
>> https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation
>>
>>
>> Best regards,
>> Krzysztof
>>
> I couldn't find anything in that list that would be a good fit for a
> name, and it seems like all of the Coresight devices have already been
> added with non generic names (like funnel and replicator etc), so it
> might be a bit late now.
>
> But if we drop the enforced name then it's probably fine.
Thanks  James.

I will make change to remove the "$nodename:".

Thanks
Jinlong Mao

>
> James