[PATCH 0/7] iio: adc: ad7606: add support for AD7606C-{16,18} parts

[Alexandru Ardelean <aardelean@baylibre.com>]

The AD7606C-16 and AD7606C-18 are pretty similar with the AD7606B.
The main difference between AD7606C-16 & AD7606C-18 is the precision in
bits (16 vs 18).
Because of that, some scales need to be defined for the 18-bit variants, as
they need to be computed against 2**18 (vs 2**16 for the 16 bit-variants).

Because the AD7606C-16,18 also supports bipolar & differential channels,
for SW-mode, the default range of 10 V or ±10V should be set at probe.
On reset, the default range (in the registers) is set to value 0x3 which
corresponds to '±10 V single-ended range', regardless of bipolar or
differential configuration.

Aside from the scale/ranges, the AD7606C-16 is similar to the AD7606B.

This changeset, does a bit of rework to the existing ad7606 driver and then
adds support for the AD7606C-16 & AD7606C-18 parts.

Datasheet links:
  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7606c-16.pdf
  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7606c-18.pdf


Alexandru Ardelean (7):
  iio: adc: ad7606: add 'bits' parameter to channels macros
  iio: adc: ad7606: move 'val' pointer to ad7606_scan_direct()
  iio: adc: ad7606: split a 'ad7606_sw_mode_setup()' from probe
  iio: adc: ad7606: wrap channel ranges & scales into struct
  iio: adc: ad7606: rework available attributes for SW channels
  dt-bindings: iio: adc: add adi,ad7606c-{16,18} compatible strings
  iio: adc: ad7606: add support for AD7606C-{16,18} parts

 .../bindings/iio/adc/adi,ad7606.yaml          |  83 ++++
 drivers/iio/adc/ad7606.c                      | 445 +++++++++++++++---
 drivers/iio/adc/ad7606.h                      |  77 ++-
 drivers/iio/adc/ad7606_spi.c                  | 110 ++++-
 4 files changed, 624 insertions(+), 91 deletions(-)

-- 
2.46.0