iio: dac: ad5686: add gain control support

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Most of the supported devices rely on a GAIN pin to control a 2x
multiplier applied to the output voltage. Other devices, e.g. the
single-channel ones, provides a gain control through a bit field in
the control register. Some designs might have the GAIN pin hardwired
to VDD/VLOGIC or GND, which would have no "gain-gpios" device property,
being able to set "adi,range-double" if it is hardwired to VDD. The
vref_mv field is moved down in the struct ad5686_state, so that the
overall size increase is reduced.

Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Rodrigo Alencar <rodrigo.alencar@analog.com>
Signed-off-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>

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Rodrigo Alencar 2026-07-16 13:14:24 +01:00 • committed by Jonathan Cameron

parent a3c37fa97b

commit 23f66b58b1

2 changed files with 125 additions and 7 deletions

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120

drivers/iio/dac/ad5686.c

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12

drivers/iio/dac/ad5686.h

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