linux-kernel - Re: [PATCH] thermal: qcom: spmi-adc-tm5: Don't abort probing if a sensor is not used

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Date:   Tue, 24 Aug 2021 11:37:42 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Amit Kucheria <amitk@...nel.org>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Thara Gopinath <thara.gopinath@...aro.org>,
        Zhang Rui <rui.zhang@...el.com>, linux-pm@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] thermal: qcom: spmi-adc-tm5: Don't abort probing if a
 sensor is not used

On Mon, Aug 23, 2021 at 06:50:04PM -0500, Stephen Boyd wrote:
> Quoting Matthias Kaehlcke (2021-08-23 13:47:30)
> > adc_tm5_register_tzd() registers the thermal zone sensors for all
> > channels of the thermal monitor. If the registration of one channel
> > fails the function skips the processing of the remaining channels
> > and returns an error, which results in _probe() being aborted.
> >
> > One of the reasons the registration could fail is that none of the
> > thermal zones is using the channel/sensor, which hardly is a critical
> > error (if it is an error at all). If this case is detected emit a
> > warning and continue with processing the remaining channels.
> >
> > Fixes: ca66dca5eda6 ("thermal: qcom: add support for adc-tm5 PMIC thermal monitor")
> > Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> > ---
> 
> Reported-by: Stephen Boyd <swboyd@...omium.org>
> Reviewed-by: Stephen Boyd <swboyd@...omium.org>

Thanks for the review!

> Should we also disable the 'charger-thermistor@0' node in
> sc7180-trogdor.dtsi on lazor boards, instead of the thermal zone, or in
> addition to the thermal zone? It isn't used so there's not much value in
> exposing it.

I wouldn't do it instead of disabling the thermal zone, a TZ without a
sensor doesn't seem very useful.

IIUC the thermistor nodes would need to be deleted, not disabled.
Currently the nodes don't have labels, so either the labels would need
to be added, or the deletion would have to look something like this:

&pm6150_adc {
        /delete-node/ charger-thermistor@4f;
};

&pm6150_adc_tm {
        /delete-node/ charger-thermistor@0;
};

If the change is done for Lazor it should also be done for PomPom and
CoachZ.

I don't see a strong need to delete the ADC nodes with the clutter it
adds, but I'm open to it if you prefer :)