When SPI offloading is supported, the IIO device provides different sysfs interfaces to allow using the adjusting the sample rate. Document SPI offload support for AD4000 and similar devices. Signed-off-by: Marcelo Schmitt <marcelo.schmitt@xxxxxxxxxx> --- Documentation/iio/ad4000.rst | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/Documentation/iio/ad4000.rst b/Documentation/iio/ad4000.rst index 468d30dc9214..2d56b0762570 100644 --- a/Documentation/iio/ad4000.rst +++ b/Documentation/iio/ad4000.rst @@ -191,3 +191,20 @@ Typical voltage channel attributes of a differential AD4000 series device: +-------------------------------------------+------------------------------------------+ | ``in_voltage0-voltage1_scale_available`` | Toggles input span compression | +-------------------------------------------+------------------------------------------+ + +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 set for SPI offload support, the IIO device will provide different +interfaces. + +* Either ``in_voltage0_sampling_frequency`` or + ``in_voltage0-voltage1_sampling_frequency`` file is provided to allow setting + the sample rate. +* IIO trigger device is not provided (no ``trigger`` directory). +* ``timestamp`` channel is not provided. -- 2.47.2
