[PATCH v4 0/9] Refactor Microchip MCP47FEB02 I2C driver in separate modules to add support for MCP48FEB02 SPI driver

[Ariana Lazar <ariana.lazar@microchip.com>]

Refactor I2C driver implementation into separate modules in order to add
support for SPI MCP48FxBy1/2/4/8 DAC family on top of the I2C implementation.
The I2C and SPI devices have the same memory map and supported
functionalities.

Signed-off-by: Ariana Lazar <ariana.lazar@microchip.com>
---
Changes in v4:
- remove unused headers
- add missing header types.h in protocol files
- create 6 precursor commits before the refactor patch for handling:
    - comment typo
    - renaming command mask define
    - for an invalid label use a debug message instead of probe error
    - correct return value in store_eeprom_store() for false state case
    - correct channel gain formula
    - read DAC value register to initialize channel data struct field at
      probe 
- Link to v3: https://lore.kernel.org/r/20260804-mcp47feb02_refactor-v3-0-97f8b81f3628@microchip.com

Changes in v3:
- renumbering the patch version to include the first patch submision
- fix review comments device tree binding:
   - change 'additionalProperties' to unevaluatedProperties
   - add else branch with spi-max-frequency in the condition which checks
     if a device has SPI interface
   - correct SPI address example
   - add clock polarity and clock phase properties for SPI devices
   - enumerate I2C devices in lexicographic order from the description section
   - specify supported SPI modes using dependencies
- fix review comments driver:
   - remove unneccesarry libraries and add the missing ones
   - correct comment typo
   - return -ENODEV using dev_err_probe() in protocol probe functions
   - use named initializers
   - move defines for registers and enums from the header to the core file
   - add dev_set_drvdata() in probe()
   - move mutex aquiring from mcp47feb02_write_to_eeprom() to
     store_eeprom_store()
   - write correct value into Vref register in resume()
- Link to v2: https://lore.kernel.org/r/20260723-mcp47feb02_refactor-v1-0-ee59e63672bc@microchip.com

v2:
- include in the same patch series the refactoring of the driver and the
  support for SPI devices, but in different patches
- remove changes regarding review comments received not related to the
  code refactoring
- first version of the combined refactoring I2C and adding support for SPI
  driver
- Link to v1: https://lore.kernel.org/all/20260403-mcp47feb02-fix2-v1-1-da60c773550e@microchip.com

v1:
- first version which did not separate the refactoring and adding support for
  SPI devices (into different patches from the same series)

---
Ariana Lazar (9):
      iio: dac: mcp47feb02: initialize dac_data field in channel data struct at probe
      iio: dac: mcp47feb02: correct gain bitshift at probe
      iio: dac: mcp47feb02: correct false state case in store_eeprom_store
      iio: dac: mcp47feb02: use dev_dbg for invalid label
      iio: dac: mcp47feb02: correct typo from a comment
      iio: dac: mcp47feb02: rename command mask define
      iio: dac: mcp47feb02: refactor MCP47FEB02 I2C driver into two modules
      dt-bindings: iio: dac: add support for MCP48FEB02 SPI
      iio: dac: add support for Microchip MCP48FEB02

 .../bindings/iio/dac/microchip,mcp47feb02.yaml     | 221 ++++++++++---
 MAINTAINERS                                        |   5 +-
 drivers/iio/dac/Kconfig                            |  33 +-
 drivers/iio/dac/Makefile                           |   4 +-
 .../iio/dac/{mcp47feb02.c => mcp47feb02-core.c}    | 352 +++------------------
 drivers/iio/dac/mcp47feb02-i2c.c                   | 145 +++++++++
 drivers/iio/dac/mcp47feb02-spi.c                   | 145 +++++++++
 drivers/iio/dac/mcp47feb02.h                       |  46 +++
 8 files changed, 585 insertions(+), 366 deletions(-)
---
base-commit: 9c6acc6e6555d34198e45cb0d309569dfbadf929
change-id: 20260625-mcp47feb02_refactor-fa8420ae3282

Best regards,
-- 
Ariana Lazar <ariana.lazar@microchip.com>