Add support for AD4170 sigma-delta ADCs #2573
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Add defines to improve readability of AD4170 device tree nodes. Signed-off-by: Ana-Maria Cusco <ana-maria.cusco@analog.com> Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com>
Add device tree documentation for AD4170 sigma-delta ADCs. Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com>
Signed-off-by: Dragos Bogdan <dragos.bogdan@analog.com> Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com>
Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com>
Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com>
Add support for the AD4170 ADC with the following features: - Single-shot read (read_raw), scale, sampling freq - Multi channel buffer support - Buffered capture in triggered mode - Buffered capture with SPI-Engine - Gain and offset calibration - Support for gpio controller - chop_iexc and chop_adc device configuration - Powerdown switch configuration Signed-off-by: Ana-Maria Cusco <ana-maria.cusco@analog.com> Signed-off-by: Dragos Bogdan <dragos.bogdan@analog.com> Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com>
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ADCs can have different input configurations such that developers can get confused when trying to model some of them into IIO channels. For example, some differential ADCs can have their channels configured as pseudo-differential channels. In that configuration, only one input connects to the signal of interest as opposed to using two inputs of a differential input configuration. Datasheets sometimes also refer to pseudo-differential inputs as single-ended inputs even though they have distinct physical configuration and measurement procedure. There has been some previous discussion in the mailing list about pseudo-differential and single-ended channels [1]. Documenting the many possible ADC channel configurations should provide two benefits: A) Consolidate the knowledge from [2] and from [1], and hopefully reduce the reviewing time of forthcoming ADC drivers. B) Help Linux developers figure out quicker how to better support differential ADCs, specially those that can have channels configured as pseudo-differential inputs. Add documentation about common ADC characteristics and IIO support for them. [1]: https://lore.kernel.org/linux-iio/0fef36f8-a7db-40cc-86bd-9449cb4ab46e@gmail.com/ [2]: https://www.analog.com/en/resources/technical-articles/sar-adc-input-types.html. Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com>
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PR Description
Add support for AD4170 Sigma-Delta ADC.
This ADC supports many configurations.
One tricky part is supporting different channel setups (differential / pseudo-differential) and voltage reference supplies.
The added documentation aims to help review this driver by explaining the many possible ADC channel configurations and tries to generalize the consolidated knowledge so it may be useful for other ADCs.
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