linux-kernel - Re: [PATCH 1/4] dt-bindings: arm: qcom,coresight-funnel: Add label for multi-ouput

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Message-ID: <d44ddcc7-1e44-415c-93d0-c08e7836e3e3@arm.com>
Date: Thu, 21 Mar 2024 14:52:10 +0000
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Rob Herring <robh@...nel.org>, Tao Zhang <quic_taozha@...cinc.com>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Konrad Dybcio <konradybcio@...il.com>, Mike Leach <mike.leach@...aro.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Jinlong Mao <quic_jinlmao@...cinc.com>, Leo Yan <leo.yan@...aro.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, coresight@...ts.linaro.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org, Tingwei Zhang <quic_tingweiz@...cinc.com>,
 Yuanfang Zhang <quic_yuanfang@...cinc.com>,
 Trilok Soni <quic_tsoni@...cinc.com>, Song Chai <quic_songchai@...cinc.com>,
 linux-arm-msm@...r.kernel.org, andersson@...nel.org
Subject: Re: [PATCH 1/4] dt-bindings: arm: qcom,coresight-funnel: Add label
 for multi-ouput

On 21/03/2024 14:42, Rob Herring wrote:
> On Thu, Mar 21, 2024 at 04:32:04PM +0800, Tao Zhang wrote:
>> Add new property "label" to label the source corresponding to the
>> output connection. When the funnel supports multi-output, this
>> property needs to be introduced to mark which source component a
>> certain output connection corresponds to.
>>
>> Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>
>> ---
>>   .../arm/arm,coresight-dynamic-funnel.yaml     | 34 ++++++++++++++++---
>>   1 file changed, 30 insertions(+), 4 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/arm/arm,coresight-dynamic-funnel.yaml b/Documentation/devicetree/bindings/arm/arm,coresight-dynamic-funnel.yaml
>> index 44a1041cb0fc..cde62c286d29 100644
>> --- a/Documentation/devicetree/bindings/arm/arm,coresight-dynamic-funnel.yaml
>> +++ b/Documentation/devicetree/bindings/arm/arm,coresight-dynamic-funnel.yaml
>> @@ -66,13 +66,39 @@ properties:
>>           $ref: /schemas/graph.yaml#/properties/port
>>   
>>     out-ports:
>> -    $ref: /schemas/graph.yaml#/properties/ports
>> -    additionalProperties: false
>> -
>> +    type: object
>>       properties:
>> +      "#address-cells":
>> +        const: 1
>> +
>> +      "#size-cells":
>> +        const: 0
>> +
>>         port:
>> +        type: object
>> +
>> +    patternProperties:
>> +      '^port(@[0-7])?$':
>> +        type: object
>>           description: Output connection to CoreSight Trace bus
>> -        $ref: /schemas/graph.yaml#/properties/port
> 
> Nope, now you have no constraints on port node properties. Please look
> at how other bindings are done to add properties on endpoint node.
> 
>> +
>> +        patternProperties:
>> +          "^endpoint(@[0-9a-f]+)?$":
>> +            type: object
>> +            properties:
>> +              remote-endpoint:
>> +                description: |
>> +                  phandle to an 'endpoint' subnode of a remote device node.
>> +                  $ref: /schemas/types.yaml#/definitions/phandle
> 
> Don't need this.
> 
>> +              label:
>> +                description: Label the source corresponding to the output connection
>> +                $ref: /schemas/types.yaml#/definitions/string
> 
> label already has a type.
> 
> As this node is an output, aren't you labeling what the destination is,
> not the "source"?
> 
> Why can't you look at the remote connection to identify what it is?

+1


Suzuki


> 
> 
>> +    oneOf:
>> +      - required:
>> +          - port
>> +      - required:
>> +          - "#address-cells"
>> +          - "#size-cells"
> 
> The common schema that you removed handles this.
> 
> Rob