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doc: iio: ad7380: describe offload support

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Add a section to the ad7380 documentation describing how to use the
driver with SPI offloading.

Signed-off-by: Angelo Dureghello <adureghello@baylibre.com>
Link: https://patch.msgid.link/20250310-wip-bl-spi-offload-ad7380-v4-2-b184b37b7c72@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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Angelo Dureghello 2025-03-10 18:39:53 +01:00 committed by Jonathan Cameron
parent bbeaec81a0
commit 8dbeb41380
1 changed files with 18 additions and 0 deletions
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18
Documentation/iio/ad7380.rst
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@ -178,6 +178,24 @@ Unimplemented features
- Power down mode
- CRC indication
SPI offload support
===================
To be able to achieve the maximum sample rate, the driver can be used with the
`AXI SPI Engine`_ to provide SPI offload support.
.. _AXI SPI Engine: http://analogdevicesinc.github.io/hdl/projects/pulsar_adc/index.html
When SPI offload is being used, some attributes will be different.
* ``trigger`` directory is removed.
* ``in_voltage0_sampling_frequency`` attribute is added for setting the sample
rate.
* ``in_voltage0_sampling_frequency_available`` attribute is added for querying
the max sample rate.
* ``timestamp`` channel is removed.
* Buffer data format may be different compared to when offload is not used,
e.g. the ``in_voltage0_type`` attribute.
Device buffers
==============