linux-kernel - RE: [RESEND, PATCH v6 1/2] dt-bindings: iio: dac: Add adi,ad3552r.yaml

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Message-ID: <SN4PR03MB6799D9A834144D6E00187B3B99719@SN4PR03MB6799.namprd03.prod.outlook.com>
Date:   Fri, 10 Dec 2021 09:05:15 +0000
From:   "Chindris, Mihail" <Mihail.Chindris@...log.com>
To:     Rob Herring <robh@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        "jic23@...nel.org" <jic23@...nel.org>,
        "Sa, Nuno" <Nuno.Sa@...log.com>,
        "Bogdan, Dragos" <Dragos.Bogdan@...log.com>,
        "alexandru.ardelean@...log.com" <alexandru.ardelean@...log.com>
Subject: RE: [RESEND, PATCH v6 1/2] dt-bindings: iio: dac: Add
 adi,ad3552r.yaml

Hi Rob

I will fix the build and update the patch.
I have a question below until then though.

Regards,
Mihail

...

> > +
> > +      custom-output-range-config:
> > +        type: object
> 
> Why does this need to be in a child node?

For an ad3552r or ad3542r you can setup a default output range and a custom one (only one of these options is possible). The custom range is configured with this child and the default can be choose with the adi,output-range-microvolt property below

The adi,output-range-microvolt is described bellow for each chip. I couldn't find a way to put it here.
Do you have any suggestion?

Mihail

> 
> > +        description: Configuration of custom range when
> > +          adi,output-range-microvolt is not present.
> > +          The formulas for calculation the output voltages are
> > +            Vout_fs = 2.5 + [(GainN + Offset/1024) * 2.5 * Rfbx * 1.03]
> > +            Vout_zs = 2.5 - [(GainP + Offset/1024) * 2.5 * Rfbx *

...