linux-kernel - Re: [PATCH v2] arm64: dts: qcom: sc8280xp: Introduce additional tsens instances

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Date: Fri, 26 Jan 2024 08:51:13 -0800
From: Bjorn Andersson <quic_bjorande@...cinc.com>
To: Johan Hovold <johan@...nel.org>
CC: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio
	<konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof
 Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley
	<conor+dt@...nel.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] arm64: dts: qcom: sc8280xp: Introduce additional
 tsens instances

On Fri, Jan 26, 2024 at 05:36:10PM +0100, Johan Hovold wrote:
> On Fri, Jan 26, 2024 at 07:12:45AM -0800, Bjorn Andersson wrote:
> > The SC8280XP contains two additional tsens instances, providing among
> > other things thermal measurements for the GPU.
> > 
> > Add these and a GPU thermal-zone.
> > 
> > Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> > ---
> > Changes in v2:
> > - Drop TM/SROT comments
> > - Remove polling delays, rely on interrupts
> > - Link to v1: https://lore.kernel.org/r/20240118-sc8280xp-tsens2_3-v1-1-e86bce14f6bf@quicinc.com
> > ---
> >  arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 37 ++++++++++++++++++++++++++++++++++
> >  1 file changed, 37 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> > index febf28356ff8..7bfbb1bd8f4a 100644
> > --- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> > @@ -4033,6 +4033,28 @@ tsens1: thermal-sensor@...5000 {
> >  			#thermal-sensor-cells = <1>;
> >  		};
> >  
> > +		tsens2: thermal-sensor@...1000 {
> > +			compatible = "qcom,sc8280xp-tsens", "qcom,tsens-v2";
> > +			reg = <0 0x0c251000 0 0x1ff>,
> > +			      <0 0x0c224000 0 0x8>;
> > +			#qcom,sensors = <11>;
> > +			interrupts-extended = <&pdc 122 IRQ_TYPE_LEVEL_HIGH>,
> > +					      <&pdc 124 IRQ_TYPE_LEVEL_HIGH>;
> > +			interrupt-names = "uplow", "critical";
> > +			#thermal-sensor-cells = <1>;
> > +		};
> > +
> > +		tsens3: thermal-sensor@...2000 {
> > +			compatible = "qcom,sc8280xp-tsens", "qcom,tsens-v2";
> > +			reg = <0 0x0c252000 0 0x1ff>,
> > +			      <0 0x0c225000 0 0x8>;
> > +			#qcom,sensors = <5>;
> > +			interrupts-extended = <&pdc 123 IRQ_TYPE_LEVEL_HIGH>,
> > +					      <&pdc 125 IRQ_TYPE_LEVEL_HIGH>;
> > +			interrupt-names = "uplow", "critical";
> > +			#thermal-sensor-cells = <1>;
> > +		};
> 
> These should go before tsens0 based on the unit address.
> 

You're right, thanks for spotting that.

> > +
> >  		aoss_qmp: power-management@...0000 {
> >  			compatible = "qcom,sc8280xp-aoss-qmp", "qcom,aoss-qmp";
> >  			reg = <0 0x0c300000 0 0x400>;
> > @@ -5212,6 +5234,21 @@ cpu-crit {
> >  			};
> >  		};
> >  
> > +		gpu-thermal {
> > +			polling-delay-passive = <0>;
> > +			polling-delay = <0>;
> > +
> > +			thermal-sensors = <&tsens2 2>;
> > +
> > +			trips {
> > +				cpu-crit {
> > +					temperature = <110000>;
> > +					hysteresis = <1000>;
> > +					type = "critical";
> > +				};
> > +			};
> > +		};
> 
> Shall you submit a follow-on patch to set the polling delays to zero
> for the other thermal zones (cpu, cluster, mem) so that we don't poll
> for those?
> 

I optimistically interpreted Konrad's response as a promise by him to do
so ;)

I do like his patch which remove the poll-properties for non-polling
mode. Would be nice to not first change the values to 0 and then remove
the properties...

> Looks good to me otherwise: 
> 
> Reviewed-by: Johan Hovold <johan+linaro@...nel.org>
> 

Thanks,
Bjorn

> Johan