linux-kernel - Re: [PATCH] arm64: dts: qcom: qcm6490-fairphone-fp5: Add thermistor for UFS/RAM

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Message-ID: <CAA8EJpoYpiuVkD3ohoVhd9VXvCxpHPPfXfY0YqrQhABUc3WPdw@mail.gmail.com>
Date: Mon, 7 Oct 2024 14:46:59 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Luca Weiss <luca.weiss@...rphone.com>
Cc: Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konradybcio@...nel.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org, 
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: qcm6490-fairphone-fp5: Add thermistor
 for UFS/RAM

On Mon, 7 Oct 2024 at 09:22, Luca Weiss <luca.weiss@...rphone.com> wrote:
>
> On Sun Oct 6, 2024 at 10:26 PM CEST, Dmitry Baryshkov wrote:
> > On Wed, Oct 02, 2024 at 03:01:08PM GMT, Luca Weiss wrote:
> > > Configure the ADC and thermal zone for the thermistor next to the
> > > UFS+RAM chip which is connected to GPIO_12 of PM7250B. It is used to
> > > measure the temperature of that area of the PCB.
> > >
> > > Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> > > ---
> > >  arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts | 40 ++++++++++++++++++++++
> > >  1 file changed, 40 insertions(+)
> > >
> > > diff --git a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
> > > index 8ab30c01712e0b7c0cc1b403e0fe01650315b9e2..fdc62f1b1c5a398abaa71818fdf2858fdc445d28 100644
> > > --- a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
> > > +++ b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
> > > @@ -207,6 +207,20 @@ active-config0 {
> > >                     };
> > >             };
> > >
> > > +           mem-thermal {
> > > +                   polling-delay-passive = <0>;
> > > +
> > > +                   thermal-sensors = <&pm7250b_adc_tm 2>;
> > > +
> > > +                   trips {
> > > +                           active-config0 {
> > > +                                   temperature = <125000>;
> > > +                                   hysteresis = <1000>;
> > > +                                   type = "passive";
> >
> > Is it really just "passive"? Especially with no cooling devices it
> > sounds more like "critical". LGTM otherwise.
>
> Hi Dmitry,
>
> To be clear, I'm adding the thermal zones now as a first step so that
> that they are declared and that they show up in /sys.
>
> This is for sure not the complete thermal configuration. Most other
> thermal zones in this dts also currently have 125 degC "passive" trip
> point, which I'd hope the device would never ever reach.

Sounds sane.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

-- 
With best wishes
Dmitry