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docs: iio: ad7380: fix supply for ad7380-4

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ad7380-4 is the only device from ad738x family that doesn't have an
internal reference. Moreover it's external reference is called REFIN in
the datasheet while all other use REFIO as an optional external
reference. Update documentation to highlight this.

Fixes: 3e82dfc82f ("docs: iio: new docs for ad7380 driver")
Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Julien Stephan <jstephan@baylibre.com>
Link: https://patch.msgid.link/20241022-ad7380-fix-supplies-v3-5-f0cefe1b7fa6@baylibre.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Julien Stephan 2024-10-22 15:22:40 +02:00 committed by Jonathan Cameron
parent 05f9c67179
commit 795114e849
1 changed files with 11 additions and 2 deletions
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13
Documentation/iio/ad7380.rst
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@ -41,13 +41,22 @@ supports only 1 SDO line.
Reference voltage Reference voltage
----------------- -----------------
2 possible reference voltage sources are supported: ad7380-4
~~~~~~~~
ad7380-4 supports only an external reference voltage (2.5V to 3.3V). It must be
declared in the device tree as ``refin-supply``.
All other devices from ad738x family
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
All other devices from ad738x support 2 possible reference voltage sources:
- Internal reference (2.5V) - Internal reference (2.5V)
- External reference (2.5V to 3.3V) - External reference (2.5V to 3.3V)
The source is determined by the device tree. If ``refio-supply`` is present, The source is determined by the device tree. If ``refio-supply`` is present,
then the external reference is used, else the internal reference is used. then it is used as external reference, else the internal reference is used.
Oversampling and resolution boost Oversampling and resolution boost
--------------------------------- ---------------------------------