linux-kernel - [PATCH v4 2/2] doc: iio: ad7380: describe offload support

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Message-Id: <20250310-wip-bl-spi-offload-ad7380-v4-2-b184b37b7c72@baylibre.com>
Date: Mon, 10 Mar 2025 18:39:53 +0100
From: Angelo Dureghello <adureghello@...libre.com>
To: Jonathan Cameron <jic23@...nel.org>, 
 Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Nuno Sá <nuno.sa@...log.com>, 
 David Lechner <dlechner@...libre.com>, Jonathan Corbet <corbet@....net>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-doc@...r.kernel.org, Angelo Dureghello <adureghello@...libre.com>
Subject: [PATCH v4 2/2] doc: iio: ad7380: describe offload support

From: Angelo Dureghello <adureghello@...libre.com>

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

Signed-off-by: Angelo Dureghello <adureghello@...libre.com>
---
 Documentation/iio/ad7380.rst | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/Documentation/iio/ad7380.rst b/Documentation/iio/ad7380.rst
index 35232a0e3ad730c19b5201b74280bdb6deaa9667..24a92a1c4371db6b59ef47edf06cee860641ebbf 100644
--- a/Documentation/iio/ad7380.rst
+++ b/Documentation/iio/ad7380.rst
@@ -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
 ==============

-- 
2.48.1