This series adds the support for software mode when the ADC is used in
iio_backend mode.
The bus access is based on Angelo's ad3552 implementation, that is we
have a particular compatible for the backend (here axi-adc) version
supporting the ad7606's register writing, and the ad7606 is defined as a
child node of the backend in the devicetree.
Small changes are added to make the code a bit more straightforward to
understand, and more compact.

Signed-off-by: Guillaume Stols <gstols@baylibre.com>
---
Guillaume Stols (9):
      iio: adc: ad7606: Fix hardcoded offset in the ADC channels
      dt-bindings: iio: dac: adi-axi-adc: Add ad7606 variant
      iio:adc: ad7606: Move the software mode configuration
      iio: adc: ad7606: Move software functions into common file
      iio: adc: adi-axi-adc: Add platform children support
      iio: adc: adi-axi-adc: Add support for AD7606 register writing
      iio: adc: ad7606: change r/w_register signature
      iio: adc: ad7606: Simplify channel macros
      iio: adc: ad7606: Add support for writing registers when using backend

 .../devicetree/bindings/iio/adc/adi,axi-adc.yaml   |   7 +
 drivers/iio/adc/ad7606.c                           | 202 +++++++++++++++++----
 drivers/iio/adc/ad7606.h                           | 113 ++++++++----
 drivers/iio/adc/ad7606_bi.h                        |  16 ++
 drivers/iio/adc/ad7606_par.c                       |  58 +++++-
 drivers/iio/adc/ad7606_spi.c                       | 141 +-------------
 drivers/iio/adc/adi-axi-adc.c                      | 178 +++++++++++++++++-
 7 files changed, 500 insertions(+), 215 deletions(-)
---
base-commit: 33d38f912d5ca05501c9bbfe14e0150da9ca85b6
change-id: 20241009-ad7606_add_iio_backend_software_mode-567d9c392243

Best regards,
--
Guillaume Stols <gstols@baylibre.com>