linux-kernel - Re: [PATCH v2 1/9] dt-bindings: arm: Add support for DSB element

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Message-ID: <058241be-ffa8-6fc6-7262-705ec41e849c@quicinc.com>
Date:   Tue, 31 Jan 2023 11:23:10 +0800
From:   Tao Zhang <quic_taozha@...cinc.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Konrad Dybcio <konradybcio@...il.com>,
        Mike Leach <mike.leach@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
CC:     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>,
        Hao Zhang <quic_hazha@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <bjorn.andersson@...aro.org>,
        Tao Zhang <taozha@....qualcomm.com>
Subject: Re: [PATCH v2 1/9] dt-bindings: arm: Add support for DSB element

Hi Krzysztof,

On 1/19/2023 6:44 PM, Krzysztof Kozlowski wrote:
> On 19/01/2023 08:41, Tao Zhang wrote:
>> Add property "qcom,dsb-elem-size" to support DSB(Discrete Single
>> Bit) element for TPDA. Specifies the DSB element size supported
>> by each monitor connected to the aggregator on each port. Should
>> be specified in pairs (port, dsb element size).
>>
>> Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>
>> Signed-off-by: Tao Zhang <taozha@....qualcomm.com>
> You are the same person and it is still the same organization
> (Qualcomm), right? Only one SoB.
I will change and update this in the next patch series.
>
>> ---
>>   .../bindings/arm/qcom,coresight-tpda.yaml          | 22 ++++++++++++++++++++++
>>   1 file changed, 22 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml b/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml
>> index 2ec9b5b..298db7f 100644
>> --- a/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml
>> +++ b/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml
>> @@ -58,6 +58,26 @@ properties:
>>       minItems: 1
>>       maxItems: 2
>>   
>> +  qcom,dsb-element-size:
>> +    description: |
>> +      Specifies the DSB(Discrete Single Bit) element size supported by
>> +      each monitor connected to the aggregator on each port. Should be
>> +      specified in pairs <port, dsb element size>.
> s/port/port number/

It should be "port number" here.

I will change "<port, dsb element size>" to "<port number, DSB element 
size>" in the next patch series.

>> +
>> +      Note: The maximum value of the port number depends on how many
>> +      input ports the current TPDA has. DSB element size currently only
>> +      supports 32-bit and 64-bit.
>> +    $ref: /schemas/types.yaml#/definitions/uint32-matrix
>> +    items:
> Are some reasonable maxItems known?

This is related to hardware design, depending on how many input ports 
the TPDA has.

We cannot limit it to a reasonable maximum value from the software.

According to the existing hardware design, TPDA with the most input 
ports has about 30 input ports.

But there may be TPDA with more input ports.

>
>> +      items:
>> +        - description: |
>> +            "port" indicates TPDA input port number
> What is "port"? You quoted it like it was some name of variable or
> property. Where is then?

The "port" here refers to the port number of other Coresight devices 
connected to the TPDA input port.

I will change and update it in the next patch series.

>> +          minimum: 0
>> +        - description: |
>> +            "dsb element size" indicates dsb element size
> "A" indicates A. This sentence does not make sense.
>
> Also missing units.
>
> s/dsb/DSB/
"DSB element size" indicate the size of the element in DSB. DSB(Discrete 
Single

Bit) is a data collection unit.

I will change and update it in the next patch series.

>
>> +          minimum: 0
>> +          maximum: 64
>> +
>>     clocks:
>>       maxItems: 1
>>   
>> @@ -100,6 +120,8 @@ examples:
>>          compatible = "qcom,coresight-tpda", "arm,primecell";
>>          reg = <0x6004000 0x1000>;
>>   
>> +       qcom,dsb-element-size = <0 32>;
>> +
>>          clocks = <&aoss_qmp>;
>>          clock-names = "apb_pclk";
>>   
> Best regards,
> Krzysztof

Best,

Tao