linux-kernel - Re: [PATCH v4 1/1] Documentation: iio: Add ADC documentation

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Message-ID: <Z7bn3TEC4faXbzEj@archie.me>
Date: Thu, 20 Feb 2025 15:29:17 +0700
From: Bagas Sanjaya <bagasdotme@...il.com>
To: Marcelo Schmitt <marcelo.schmitt@...log.com>, linux-iio@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: jic23@...nel.org, lars@...afoo.de, corbet@....net,
	dlechner@...libre.com, marcelo.schmitt1@...il.com
Subject: Re: [PATCH v4 1/1] Documentation: iio: Add ADC documentation

On Wed, Feb 19, 2025 at 06:00:56PM -0300, Marcelo Schmitt wrote:
> +For a **single-ended bipolar** channel, the analog voltage input can go from
> +-VREF to +VREF (where -VREF is the voltage reference that has the lower
> +electrical potential while +VREF is the reference with the higher one). Some ADC
> +chips derive the lower reference from +VREF, others get it from a separate
                                                  "... obtain it ..."
> +input. Often, +VREF and -VREF are symmetric but they don't need to be so. When
> +-VREF is lower than system ground, these inputs are also called single-ended
> +true bipolar. Also, while there is a relevant difference between bipolar and
> +true bipolar from the electrical perspective, IIO makes no explicit distinction
> +between them.
> +
> <snipped>...
> +In the ADC driver, ``differential = 1`` is set into ``struct iio_chan_spec`` for
> +the channel. Even though, there are three general input types, ``differential``
> +is only used to distinguish between differential and not differential (either
                                                   "... non-differential ..."
> +single-ended or pseudo-differential) input types. See
> +``include/linux/iio/iio.h`` for more information.

Thanks.

-- 
An old man doll... just what I always wanted! - Clara

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