linux-kernel - Re: [PATCH 09/11] arm64: dts: qcom: sc8280xp-x13s: Add PM8280

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Date:   Sun, 30 Oct 2022 12:46:59 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     andersson@...nel.org, konrad.dybcio@...ainline.org,
        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
Subject: Re: [PATCH 09/11] arm64: dts: qcom: sc8280xp-x13s: Add PM8280_{1/2}
 VADC channels

On Sat, Oct 29, 2022 at 10:18:37AM +0530, Manivannan Sadhasivam wrote:
> On Thu, Oct 27, 2022 at 10:09:21AM -0400, Krzysztof Kozlowski wrote:
> > On 27/10/2022 02:30, Manivannan Sadhasivam wrote:
> > > Add VADC channels of PM8280_{1/2} PMICs for measuring the on-chip die
> > > temperature and external thermistors connected to the AMUX pins.
> > > 
> > > The measurements are collected by the primary PMIC PMK8280 from the
> > > slave PMICs PM8280_{1/2} and exposed them over the PMK8280's VADC
> > 
> > secondary PMICs
> > 
> > Drop "them"
> > 
> > 
> > > channels.
> > > 
> > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > > ---
> > >  .../qcom/sc8280xp-lenovo-thinkpad-x13s.dts    | 61 +++++++++++++++++++
> > >  1 file changed, 61 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 9ac5d5c22832..d300d217fdc6 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-pm8350.h>
> > >  #include <dt-bindings/iio/qcom,spmi-adc7-pmk8350.h>
> > >  #include <dt-bindings/regulator/qcom,rpmh-regulator.h>
> > >  
> > > @@ -189,6 +190,66 @@ pmk8280-xo-therm@44 {
> > >  		qcom,ratiometric;
> > >  		qcom,hw-settle-time = <200>;
> > >  	};
> > > +
> > > +	pm8280-1-die-temp@103 {
> > 
> > pmic-die-temp? What pm8280 stands here?
> > 
> 
> As agreed, will use "pmic-die-temp"
> 
> > 
> > > +		reg = <PM8350_ADC7_DIE_TEMP(1)>;
> > > +		label = "pm8280_1_die_temp";
> > > +		qcom,pre-scaling = <1 1>;
> > > +	};
> > > +
> > > +	sys-therm1@144 {
> > 
> > I would say sys-therm@... why do we need the "1" suffix in node name?
> > 
> 
> Suffix represents the index of the thermistor as per the schematics but I guess
> it can be dropped.
> 

I was wrong. Suffix is necessary since IIO core registers the channel based on
the node name, so it has to be unique.

Thanks,
Mani

> Thanks,
> Mani
> 
> > > +		reg = <PM8350_ADC7_AMUX_THM1_100K_PU(1)>;
> > > +		qcom,ratiometric;
> > > +		qcom,hw-settle-time = <200>;
> > > +	};
> > 
> > Best regards,
> > Krzysztof
> > 
> 
> -- 
> மணிவண்ணன் சதாசிவம்

-- 
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