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iio: ABI: Encourage differential voltage ABI usage

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So far, parts that could only do differential voltage measurements were
only required to have a consistent labeling of their channels by complying
either to voltageY or to voltageY-voltageZ ABI. Over time, code maintainers
came to the conclusion that the voltageY-voltageZ ABI is better suited for
differential-only chips as it provides a simple indication to users that
the channels measure the difference of two inputs.

Adjust the ABI documentation to recommend using the voltageY-voltageZ ABI
for chips that do only differential voltage measurements.

Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com>
Signed-off-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>
This commit is contained in:
Marcelo Schmitt
2026-07-27 18:32:18 -03:00
committed by Jonathan Cameron
parent d9166f1a99
commit ce717fbfda
1 changed files with 5 additions and 4 deletions
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9
Documentation/ABI/testing/sysfs-bus-iio
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@@ -162,10 +162,11 @@ Contact: linux-iio@vger.kernel.org
Description:
Raw (unscaled) differential voltage measurement equivalent to
channel Y - channel Z where these channel numbers apply to the
physically equivalent inputs when non differential readings are
separately available. In differential only parts, then all that
is required is a consistent labeling. Units after application
of scale and offset are millivolts.
physically equivalent inputs when non-differential readings are
separately available. Even though differential-only parts had
been merely required to have consistent channel labeling, this
ABI is preferred over the non-differential one for those chips.
Units after application of scale and offset are millivolts.
What: /sys/bus/iio/devices/iio:deviceX/in_altvoltageY_rms_raw
KernelVersion: 6.18