[PATCH v5 0/2] iio: adc: ad7944: new driver

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This is a new driver for the Analog Devices AD7944/AD7985/AD7986 family
of ADCs. These are fairly simple chips (e.g. no configuration registers)
but do have some unusual SPI configurations. The initial driver is only
supporting the normal (4-wire) SPI mode.

This work is done on behalf of Analog Devices, Inc., hence the
MAINTAINERS are @analog.com folks.

Changes in v5:
- DT bindings:
    - fixed typo
    - picked up Rob's reviewed-by
- Driver:
    - Dropped "nanoseconds" from comments.
    - Renamed "t" to "timing_spec"
    - Replaced "&spi->dev" with "dev"
    - Fixed logic on optional "ref" regulator
    - Added comment explaining why "cnv" gpio is required
    - Simplified always_turbo assignment
- Link to v4: https://lore.kernel.org/r/20240229-ad7944-mainline-v4-0-f88b5ec4baed@xxxxxxxxxxxx

Changes in v4:
- Fixed broken DT patch due to misplaced changelog
- Link to v3: https://lore.kernel.org/r/20240228-ad7944-mainline-v3-0-781b922334af@xxxxxxxxxxxx

Changes in v3:
- Removed 'multi' value from adi,spi-mode property in DT bindings
- Modified driver for above change
- Fixed spelling of 'conventional'
- Added '#daisy-chained-devices' to DT bindings
- Added comments explaining that '3-wire' mode is not related to
- Replaced _sign with _diff in chip info struct to properly handle
  pseudo-differential vs. true differential chips
- Link to v2: https://lore.kernel.org/r/20240216-ad7944-mainline-v2-0-7eb69651e592@xxxxxxxxxxxx

Changes in v2:
- Added limit to spi-max-frequency for chain mode in DT bindings
- Added spi-cpol property to DT bindings
- Renamed '3-wire' mode to 'single' mode (to avoid confusion with spi-3wire)
- Renamed '4-wire' mode to 'multi' mode
- Dropped adi,reference property - now using only ref-supply and 
  refin-supply to determine the reference voltage source
- Fixed spelling of TURBO
- Renamed t_cnv to t_conv to match datasheet name and fixed comment
- Fixed wrong timestamp pushed to buffer
- Fixed scaling for chips with signed data
- Make use of sysfs_match_string() function
- Link to v1: https://lore.kernel.org/r/20240206-ad7944-mainline-v1-0-bf115fa9474f@xxxxxxxxxxxx

David Lechner (2):
      dt-bindings: iio: adc: add ad7944 ADCs
      iio: adc: ad7944: add driver for AD7944/AD7985/AD7986

 .../devicetree/bindings/iio/adc/adi,ad7944.yaml    | 213 +++++++++++
 MAINTAINERS                                        |   9 +
 drivers/iio/adc/Kconfig                            |  10 +
 drivers/iio/adc/Makefile                           |   1 +
 drivers/iio/adc/ad7944.c                           | 416 +++++++++++++++++++++
 5 files changed, 649 insertions(+)
base-commit: 74744b27ba8cb8c265263aa0ff0693350a8cbc19
change-id: 20240206-ad7944-mainline-17c968aa0967

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