linux-kernel - Re: [PATCH v2] iio: iadc: Qualcomm SPMI PMIC current ADC driver

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Message-ID: <20140924171046.GM5729@leverpostej>
Date:	Wed, 24 Sep 2014 18:10:46 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	"Ivan T. Ivanov" <iivanov@...sol.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <Pawel.Moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Jonathan Cameron <jic23@...nel.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Hartmut Knaack <knaack.h@....de>,
	Lee Jones <lee.jones@...aro.org>,
	Philippe Reynes <tremyfr@...oo.fr>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v2] iio: iadc: Qualcomm SPMI PMIC current ADC driver

> > > > +
> > > > +- qcom,rsense:
> > > > +    Usage: optional
> > > > +    Value type: <u32>
> > > > +    Definition: External sense register value in Ohm. Defining this
> > > > +            propery will instruct ADC to use external ADC sense channel.
> > > > +            If property is not defined ADC will use internal sense channel.
> > > 
> > > The latter two sentences sound like a driver description.
> > > 
> > > What exactly is the difference between the internal and external
> > > channels, and what exactly is the value in the sense register used for?
> > 
> > Internal - when using chip build-in resistor
> > External - when using off-chip resistor
> 
> Would it be possible to use the internal channel when you have an
> external resistor?
> 
> If so, does the device have a channel per resistor, or can either
> resistor be selected and applied to the single channel the device has?
> 
> This might be better worded as "external-registor-ohms".

I meant to say "external-resistor-ohms".

Muscle memory and lack of coffee got the better of me.

Mark.
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