iio: dac: mcp4821: add configurable gain support

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Add support for configuring the DAC gain using the GA bit

The MCP4821 supports two gain settings:
- 1x gain → 2.048V full-scale
- 2x gain → 4.096V full-scale

Scale write support is added in the IIO interface. Only scale
values advertised via the scale_available attribute are accepted,
ensuring consistency between the configured gain and exposed
scale values.

Signed-off-by: Nikhil Gautam <nikhilgtr@gmail.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

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Nikhil Gautam 2026-04-14 22:33:08 +05:30 • committed by Jonathan Cameron

parent 090839ecff

commit 416e983c91

1 changed files with 108 additions and 20 deletions

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drivers/iio/dac/mcp4821.c

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