linux-kernel - Re: [PATCH v2 08/12] arm64: dts: qcom: sc8280xp-x13s: Add PMK8280 VADC channels

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Date:   Sat, 29 Oct 2022 16:18:53 +0200
From:   Konrad Dybcio <konrad.dybcio@...ainline.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        andersson@...nel.org
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        johan+linaro@...nel.org, quic_jprakash@...cinc.com,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, steev@...i.org
Subject: Re: [PATCH v2 08/12] arm64: dts: qcom: sc8280xp-x13s: Add PMK8280
 VADC channels



On 29.10.2022 07:14, Manivannan Sadhasivam wrote:
> Add VADC channels for measuring the on-chip die temperature and external
> crystal osciallator temperature of PMK8280.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>  .../dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> index 6aa8cf6d9776..18315743313b 100644
> --- a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> +++ b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> @@ -7,6 +7,7 @@
>  /dts-v1/;
>  
>  #include <dt-bindings/gpio/gpio.h>
> +#include <dt-bindings/iio/qcom,spmi-adc7-pmk8350.h>
>  #include <dt-bindings/regulator/qcom,rpmh-regulator.h>
>  
>  #include "sc8280xp.dtsi"
> @@ -173,6 +174,23 @@ &pmk8280_pon_resin {
>  	status = "okay";
>  };
>  
> +&pmk8280_vadc {
> +	status = "okay";
As I mentioned in the patch adding this to the PMIC DTSI, it's enabled by default (perhaps by mistake).
> +
> +	pmic-die-temp@3 {
> +		reg = <PMK8350_ADC7_DIE_TEMP>;
> +		label = "pmk8280_die_temp";
> +		qcom,pre-scaling = <1 1>;
> +	};
> +
> +	xo-therm@44 {
> +		reg = <PMK8350_ADC7_AMUX_THM1_100K_PU>;
> +		label = "pmk8280_xo_therm";
> +		qcom,ratiometric;
> +		qcom,hw-settle-time = <200>;
having qcom,hw-settle-time above qcom,ratiometric would make this more reverse-Christmas-tree-y, but
maybe I'm just picky..

For the contents though:

Reviewed-by: Konrad Dybcio <konrad.dybcio@...ainline.org>

Konrad
> +	};
> +};
> +
>  &qup0 {
>  	status = "okay";
>  };