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

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Message-ID: <fshhw6lknar4z36rc2sjjcgkiixpp7hak7gq3j373mjvbokax3@7s7kmzlmtjal>
Date: Sun, 6 Oct 2024 23:26:30 +0300
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 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.

> +				};
> +			};
> +		};
> +
>  		pm8008-thermal {
>  			polling-delay-passive = <100>;
>  			thermal-sensors = <&pm8008>;

-- 
With best wishes
Dmitry