Add support for AD4170.
Initial driver for ad4170 was inpired from ad4130. Then I picked it up from
ADI Linux repo and changed a lot. Clock provider support is the same from
ad7173.

Most disruptive things are:
- Draft support for negative/bipolar voltage reference supply.
- IIO channels sharing setup number will share configurations.
- Draft ADC documentation to help clarify/explain why so many possible ADC
  input configurations.

This is big so not expecting to receive any review on this any time soon.
Happy holly days.

Ana-Maria Cusco (2):
  include: dt-bindings: iio: adc: Add defines for AD4170
  iio: adc: Add support for AD4170

Marcelo Schmitt (2):
  dt-bindings: iio: adc: Add AD4170
  Documentation: iio: Add ADC documentation

 .../bindings/iio/adc/adi,ad4170.yaml          |  473 ++++
 Documentation/iio/iio_adc.rst                 |  280 +++
 Documentation/iio/index.rst                   |    1 +
 drivers/iio/adc/Kconfig                       |   16 +
 drivers/iio/adc/Makefile                      |    1 +
 drivers/iio/adc/ad4170.c                      | 2049 +++++++++++++++++
 drivers/iio/adc/ad4170.h                      |  316 +++
 include/dt-bindings/iio/adc/adi,ad4170.h      |   96 +
 8 files changed, 3232 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad4170.yaml
 create mode 100644 Documentation/iio/iio_adc.rst
 create mode 100644 drivers/iio/adc/ad4170.c
 create mode 100644 drivers/iio/adc/ad4170.h
 create mode 100644 include/dt-bindings/iio/adc/adi,ad4170.h


base-commit: a61ff7eac77e86de828fe28c4e42b8ae9ec2b195
-- 
2.45.2