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docs: iio: ad7380: add adaq4370-4 and adaq4380-4

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Adding documentation for adaq4370-4 and adaq4380-4 supported devices. In
particular, document the reference voltage mechanism and the gain
parameter that are specific to adaq devices.

Signed-off-by: Julien Stephan <jstephan@baylibre.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20241030-ad7380-add-adaq4380-4-support-v4-5-864ff02babae@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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Julien Stephan 2024-10-30 14:44:29 +01:00 committed by Jonathan Cameron
parent c904e6dcf4
commit 5e66d01f60
1 changed files with 16 additions and 0 deletions
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Documentation/iio/ad7380.rst
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@ -27,6 +27,8 @@ The following chips are supported by this driver:
* `AD7386-4 <https://www.analog.com/en/products/ad7386-4.html>`_
* `AD7387-4 <https://www.analog.com/en/products/ad7387-4.html>`_
* `AD7388-4 <https://www.analog.com/en/products/ad7388-4.html>`_
* `ADAQ4370-4 <https://www.analog.com/en/products/adaq4370-4.html>`_
* `ADAQ4380-4 <https://www.analog.com/en/products/adaq4380-4.html>`_
Supported features
@ -47,6 +49,12 @@ 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``.
ADAQ devices
~~~~~~~~~~~~
adaq4370-4 and adaq4380-4 don't have an external reference, but use a 3.3V
internal reference derived from one of its supplies (``refin-supply``)
All other devices from ad738x family
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@ -121,6 +129,14 @@ Example for AD7386/7/8 (2 channels parts):
When enabling sequencer mode, the effective sampling rate is divided by two.
Gain (ADAQ devices only)
~~~~~~~~~~~~~~~~~~~~~~~~
ADAQ devices have a pin selectable gain in front of each ADC. The appropriate
gain is selectable from device tree using the ``adi,gain-milli`` property.
Refer to the typical connection diagrams section of the datasheet for pin
wiring.
Unimplemented features
----------------------