linux-kernel - Re: [PATCH v5 1/4] dt-bindings: interconnect: qcom,msm8998-cpu-bwmon: add BWMON device

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Message-ID: <Yr2yi+Zl6m+JD69j@builder.lan>
Date:   Thu, 30 Jun 2022 09:26:19 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Rajendra Nayak <quic_rjendra@...cinc.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Georgi Djakov <djakov@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v5 1/4] dt-bindings: interconnect:
 qcom,msm8998-cpu-bwmon: add BWMON device

On Wed 29 Jun 06:21 CDT 2022, Rajendra Nayak wrote:

> 
> > This BWMON device sits between
> > CPU and Last Level Cache Controller.
> 
> []...
> 
> > +properties:
> > +  compatible:
> > +    oneOf:
> > +      - items:
> > +          - enum:
> > +              - qcom,sdm845-cpu-bwmon
> 
> should this be qcom,sdm845-llcc-bwmon instead since it actually
> tells us the llcc bw values?
> That way perhaps the other one between llcc and DDR can be
> qcom,sdm845-ddr-bwmon.
> 

My understanding is that this bwmon instance measures the data
throughput on the CPU subsystem-ports and that the bwmon5 instance
measures the traffic from the memnoc towards LLCC and DDR.

Which matches the downstream naming of bwmon4 == cpu, bwmon5 == llcc.

Regards,
Bjorn