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

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Message-ID: <20220913004859.GA1948424-robh@kernel.org>
Date:   Mon, 12 Sep 2022 19:48:59 -0500
From:   Rob Herring <robh@...nel.org>
To:     Tao Zhang <quic_taozha@...cinc.com>
Cc:     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>,
        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>,
        Hao Zhang <quic_hazha@...cinc.com>,
        linux-arm-msm@...r.kernel.org, bjorn.andersson@...aro.org
Subject: Re: [PATCH 1/9] dt-bindings: arm: Add support for DSB element

On Thu, Sep 08, 2022 at 04:44:57PM +0800, Tao Zhang wrote:
> Add property "qcom,dsb-elem-size" to support DSB 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).

What is DSB?

> 
> Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>
> ---
>  Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml b/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml
> index eb9bfc5..1bb3fdf 100644
> --- a/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml
> +++ b/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml
> @@ -40,6 +40,13 @@ properties:
>      minItems: 1
>      maxItems: 2
>  
> +  qcom,dsb-elem-size:
> +    description: |
> +      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).
> +    $ref: /schemas/types.yaml#/definitions/uint32-array

The binding (not yet upstream) says there is just 1 port (port 0). So 
why do you need more than a single uint32?

Rob