linux-kernel - Re: [PATCH v4 2/2] iio: adc: ad7380: new driver for AD7380 ADCs

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Message-ID: <CAMknhBGkUP2Tdze5Fa_0qTcCP_OgcTxtczKYZiH1icfuTAEe+g@mail.gmail.com>
Date: Mon, 19 Feb 2024 13:47:03 -0600
From: David Lechner <dlechner@...libre.com>
To: linux-iio@...r.kernel.org, devicetree@...r.kernel.org
Cc: Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Jonathan Cameron <jic23@...nel.org>, Michael Hennerich <michael.hennerich@...log.com>, 
	Nuno Sá <nuno.sa@...log.com>, 
	Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org, 
	Stefan Popa <stefan.popa@...log.com>, Julien Stephan <jstephan@...libre.com>
Subject: Re: [PATCH v4 2/2] iio: adc: ad7380: new driver for AD7380 ADCs

On Wed, Jan 10, 2024 at 2:29 PM David Lechner <dlechner@...libre.com> wrote:

..

> +
> +/* fully differential */
> +DEFINE_AD7380_DIFFERENTIAL_2_CHANNEL(ad7380_channels, 16);
> +DEFINE_AD7380_DIFFERENTIAL_2_CHANNEL(ad7381_channels, 14);
> +/* pseudo differential */
> +DEFINE_AD7380_DIFFERENTIAL_2_CHANNEL(ad7383_channels, 16);
> +DEFINE_AD7380_DIFFERENTIAL_2_CHANNEL(ad7384_channels, 14);
> +

Similar question to [1] in light of [2]: Since AD7383 and AD7384 are
pseudo-differential, should we handle them differently? I.e. add
aina-supply and ainb-supply DT properties for the negative inputs
(typically a V_REF / 2 supply) and remove the differential flag from
the channel spec.

[1]: https://lore.kernel.org/linux-iio/CAMknhBH2Pqa9xpPxnTCxJegVTbOG-QDeJA4YrQUPfj+hfSs73A@mail.gmail.com/
[2]: https://lore.kernel.org/linux-iio/CAMknhBF5mAsN1c-194Qwa5oKmqKzef2khXnqA1cSdKpWHKWp0w@mail.gmail.com/