linux-kernel - Re: [PATCH 00/15] thermal: qcom: tsens: Add interrupt support

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Date:   Mon, 29 Jul 2019 05:07:35 -0400
From:   Brian Masney <masneyb@...tation.org>
To:     Amit Kucheria <amit.kucheria@...aro.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Eduardo Valentin <edubezval@...il.com>,
        Andy Gross <andy.gross@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Marc Gonzalez <marc.w.gonzalez@...e.fr>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 00/15] thermal: qcom: tsens: Add interrupt support

On Sat, Jul 27, 2019 at 12:58:54PM +0530, Amit Kucheria wrote:
> On Fri, Jul 26, 2019 at 4:59 PM Brian Masney <masneyb@...tation.org> wrote:
> > On Fri, Jul 26, 2019 at 04:40:16PM +0530, Amit Kucheria wrote:
> > > How well does cpufreq work on 8974? I haven't looked at it yet but
> > > we'll need it for thermal throttling.
> >
> > I'm not sure how to tell if the frequency is dynamically changed during
> > runtime on arm. x86-64 shows this information in /proc/cpuinfo. Here's
> > the /proc/cpuinfo on the Nexus 5:
> 
> Nah. /proc/cpuinfo won't show what we need.
> 
> Try the following:
> 
> $ grep "" /sys/devices/system/cpu/cpufreq/policy?/*
> 
> More specifically, the following files have the information you need.
> Run watch -n1 on them.
> 
> $ grep "" /sys/devices/system/cpu/cpufreq/policy?/scaling_*_freq

There's no cpufreq directory on msm8974:

    # ls -1 /sys/devices/system/cpu/
    cpu0
    cpu1
    cpu2
    cpu3
    cpuidle
    hotplug
    isolated
    kernel_max
    modalias
    offline
    online
    possible
    power
    present
    smt
    uevent

I'm using qcom_defconfig.

Brian