linux-kernel - Re: [PATCH] arm64: dts: qcom: msm8939-longcheer-l9100: Add proximity-near-level

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Message-ID: <11c55f82ec95f66f8b9381bf8a1a3b273ae986ab.camel@apitzsch.eu>
Date:   Wed, 18 Oct 2023 21:53:49 +0200
From:   André Apitzsch <git@...tzsch.eu>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: msm8939-longcheer-l9100: Add
 proximity-near-level

Am Mittwoch, dem 18.10.2023 um 10:32 +0200 schrieb Konrad Dybcio:
> 
> 
> On 10/17/23 22:03, André Apitzsch wrote:
> > Am Dienstag, dem 17.10.2023 um 18:25 +0200 schrieb Konrad Dybcio:
> > > 
> > > 
> > > On 10/16/23 22:18, André Apitzsch wrote:
> > > > Consider an object near to the sensor when their distance is
> > > > about
> > > > 4 cm
> > > > or below.
> > > > 
> > > > Signed-off-by: André Apitzsch <git@...tzsch.eu>
> > > > ---
> > > Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> > > 
> > > Out of interest, what is it set to by default?
> > > 
> > > Konrad
> > 
> > The default value is 0.
> That much I could guess :) I was wondering if it meant more like "it
> can detect movement from 1km away" or "disabled"
> 
> Konrad

I doubt that this sensor can detect anything from a distance of 50cm.

The values returned by the sensor are all non-negative, i.e. zero means
something like "disabled" as every raw proximity value would be
considered 'near' to the sensor according to the description in
iio/common.yaml.

André