linux-kernel - Re: [PATCH 3/3] arm64: dts: qcom: sc7180: Delete charger thermal zone and ADC channel for lazor <= rev3

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Date:   Mon, 22 Feb 2021 12:20:04 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        devicetree@...r.kernel.org, Matthias Kaehlcke <mka@...omium.org>
Subject: Re: [PATCH 3/3] arm64: dts: qcom: sc7180: Delete charger thermal zone and ADC channel for lazor <= rev3

Quoting Matthias Kaehlcke (2021-02-19 18:10:59)
> Lazor rev3 and older are stuffed with a 47k NTC as thermistor for
> the charger temperature which currently isn't supported by the
> PM6150 ADC driver. Delete the charger thermal zone and ADC channel
> to avoid the use of bogus temperature values.
> 
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
> 
>  arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor-r0.dts | 9 +++++++++
>  arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor-r1.dts | 9 +++++++++
>  arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor-r3.dts | 9 +++++++++
>  3 files changed, 27 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor-r0.dts b/arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor-r0.dts
> index 30e3e769d2b4..0974dbd424e1 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor-r0.dts
> +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor-r0.dts
> @@ -14,6 +14,15 @@ / {
>         compatible = "google,lazor-rev0", "qcom,sc7180";
>  };
>  
> +/*
> + * rev <= 3 are stuffed with a 47k NTC as charger thermistor which is currently
> + * not supported by the PM6150 ADC driver. Delete the thermal zone and ADC
> + * channel to avoid the use of bogus temperature values.
> + */
> +/delete-node/ &charger_thermal;
> +/delete-node/ &pm6150_adc_charger_thm;
> +/delete-node/ &pm6150_adc_tm_charger_thm;

Can we disable pm6150_adc_tm instead on <= rev3 boards? It would be the
same number of lines, but is simpler to reason about disabled nodes vs.
deleted nodes usually.

> +
>  &pp3300_hub {
>         /* pp3300_l7c is used to power the USB hub */
>         /delete-property/regulator-always-on;