linux-kernel - Re: [PATCH v3 01/11] dt-bindings: arm: Add support for DSB element size

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Message-ID: <fb5d55ba-8f7b-292e-e676-9423c36f4085@quicinc.com>
Date:   Fri, 24 Mar 2023 17:15:54 +0800
From:   Tao Zhang <quic_taozha@...cinc.com>
To:     Suzuki K Poulose <suzuki.poulose@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        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>,
        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 <andersson@...nel.org>
Subject: Re: [PATCH v3 01/11] dt-bindings: arm: Add support for DSB element
 size

Hi Suzuki,

在 3/24/2023 4:25 PM, Tao Zhang 写道:
> Hi Suzuki,
>
> 在 3/23/2023 7:18 PM, Suzuki K Poulose 写道:
>> On 23/03/2023 06:03, Tao Zhang wrote:
>>> Add property "qcom,dsb-elem-size" to support DSB(Discrete Single
>>> Bit) element for TPDM. The associated aggregator will read this
>>> size before it is enabled. DSB element size currently only
>>> supports 32-bit and 64-bit.
>>>
>>> Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>
>>> ---
>>>   .../devicetree/bindings/arm/qcom,coresight-tpdm.yaml | 11 +++++++++++
>>>   1 file changed, 11 insertions(+)
>>>
>>> diff --git 
>>> a/Documentation/devicetree/bindings/arm/qcom,coresight-tpdm.yaml 
>>> b/Documentation/devicetree/bindings/arm/qcom,coresight-tpdm.yaml
>>> index 5c08342..d9b6b613 100644
>>> --- a/Documentation/devicetree/bindings/arm/qcom,coresight-tpdm.yaml
>>> +++ b/Documentation/devicetree/bindings/arm/qcom,coresight-tpdm.yaml
>>> @@ -44,6 +44,15 @@ properties:
>>>       minItems: 1
>>>       maxItems: 2
>>
>>
>>>   +  qcom,dsb-element-size:
>>> +    description:
>>> +      Specifies the DSB(Discrete Single Bit) element size supported by
>>> +      the monitor. The associated aggregator will read this size 
>>> before it
>>> +      is enabled. DSB element size currently only supports 32-bit 
>>> and 64-bit.
>>> +    $ref: /schemas/types.yaml#/definitions/uint32
>>> +    minimum: 32
>>> +    maximum: 64
>>
>> Shouldn't this be something like oneOf ? It is not a range, but one of
>> those two specific values ?
>
> Yes, "qcom,dsb-element-size" should be an optional option required in 
> TPDM
>
> devicetree. Other properties like "qcom,cmb-element-size", 
> "qcom,tc-element-size"
>
> and etc. will be added in a later patch series.
>
> I will update this doc according to your advice in the next version of 
> the patch.
>
> Tao
>
Correct my misunderstanding in the mail above.

You are right, DSB element size should be 32-bit or 64-bit. I will 
update this in the next

patch series.


Tao

>>
>> Suzuki
>>
>>
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