[PATCH v4 0/3] Add AD74413R driver

[Cosmin Tanislav <demonsingur@gmail.com>]

The AD74412R and AD74413R are quad-channel software configurable input/output
solutions for building and process control applications. They contain
functionality for analog output, analog input, digital input, resistance
temperature detector, and thermocouple measurements integrated
into a single chip solution with an SPI interface.
The devices feature a 16-bit ADC and four configurable 13-bit DACs to provide
four configurable input/output channels and a suite of diagnostic functions.
The AD74413R differentiates itself from the AD74412R by being HART-compatible.

V1 -> V2
 * sign off using company email

V2 -> V3
 * replace gpo config firmware flag with one flag specifying whether gpo is in
   comparator mode
 * create two separate gpiochips, one output-only for GPO pins not in
   comparator mode and one input-only for the value of digital input channels
 * wire up all gpo functionalities using pinconf
 * keep number of characters per line under 80
 * rework locking
 * do not invalidate other chip revisions
 * do not set indio device parent
 * print probe error for refin regulator
 * move conversion from range register value to range / offset / raw offset
   into separate function
 * module.h -> mod_devicetable.h
 * use generic firmware interface functions
 * add comment regarding cache alignment
 * add comment regarding ADC channels buffered read setup
 * un-inline comment regarding 100us delay for conversion start
 * inline return statements
 * remove assignments to val2 where not necessary
 * local_channels -> chans
 * index -> i
 * channel_config -> config
 * IIO_ALTVOLTAGE -> IIO_VOLTAGE
 * .info_mask_shared_by_type_available -> .info_mask_separate_available
 * remove unlikely probe error messages
 * use an array indexed by channel function for retrieving iio channels
 * count iio channels while parsing
 * move HART rate rejection outside of setter
 * move channel function validation outside of setter
 * use SPI messages for read and write
 * validate DAC code earlier
 * simplify switches to only handle existing iio channels
 * pass indio_dev into functions needing access to it
 * pass spi into devm_regmap_init
 * dt-bindings: sort compatibles
 * dt-bindings: remove driver word from description
 * dt-bindings: remove refin supply description
 * dt-bindings: specify channel function default value
 * dt-bindings: remove maxItems from scalar value

V3 -> v4
 * remove double gpo from macro name
 * reset at probe
 * config -> chip_info and store chip name inside chip info
 * cacheline align every DMA buffer
 * simplify generation of adc samples message by caching xfer, tx_buf and rx_buf
 * use mask itself for writing the value of channel enable and gpo data
 * move reg read and write transfers to the same buffers and use local
   variables for transfers
 * merge the two for loops handling gpio configuration
 * let firmware decide irq edge
 * remove INDIO_BUFFER_SOFTWARE already set by iio framwork
 * do not set trigger device parent
 * return dev_err_probe for regulator error case
 * do not set cs_change to 0 when not needed
 * do not set spi device drvdata as it is not needed
 * fix bug regarding wrong channels being created for resistance input,
   digital input, and current input with hart
 * use voltage input channels spec for high impedance mode
 * put () around macro parameters
 * merge AD74413R_CHANNEL macro into its uses
 * remove unused switch case scope
 * inline return IIO_VAL_INT
 * use {get,put}_unaligned_be16
 * use proper types for reg and val
 * move default case handling into switch statements
 * pass driver state into regmap functions
 * use genmask for generating a 16bit max value
 * alphanumeric order for part numbers
 * dt-bindings: remove $ref from ohms value

Cosmin Tanislav (3):
  iio: add adddac subdirectory
  dt-bindings: iio: add AD74413R
  iio: addac: add AD74413R driver

 .../bindings/iio/addac/adi,ad74413r.yaml      |  153 ++
 MAINTAINERS                                   |    9 +
 drivers/iio/Kconfig                           |    1 +
 drivers/iio/Makefile                          |    1 +
 drivers/iio/addac/Kconfig                     |   20 +
 drivers/iio/addac/Makefile                    |    7 +
 drivers/iio/addac/ad74413r.c                  | 1473 +++++++++++++++++
 include/dt-bindings/iio/addac/adi,ad74413r.h  |   21 +
 8 files changed, 1685 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/addac/adi,ad74413r.yaml
 create mode 100644 drivers/iio/addac/Kconfig
 create mode 100644 drivers/iio/addac/Makefile
 create mode 100644 drivers/iio/addac/ad74413r.c
 create mode 100644 include/dt-bindings/iio/addac/adi,ad74413r.h

-- 
2.34.1