[PATCH v5 0/2] Driver for Microchip digital potentiometers

[Peter Rosin]

From: Peter Rosin <peda@xxxxxxxxxx>

This is the fifth attempt for a driver for these chips.

Thanks for review comments from Greg Kroah-Hartman, Crt Mori,
Daniel Baluta, Lars-Peter Clauson, Andreas Dannenberg, Peter
Meerwald and Jonathan Cameron. I think and hope I got it all sorted.

Changes since v4:
- Less convoluted changelog (Jonathan)
- Use an index into an array of configs as dev_id (Jonathan)
- Drop .address and use .channel (Jonathan)
- Remove one layer of wrappers (Jonathan)
- Provide a scale (Jonathan, Lars-Peter)

Changes since v3:
- Use i2c_smbus_read_word_swapped (Peter)
- Use devm_iio_device_register and drop the mcp4531_remove op (Peter)
- Add defines for a few magic numbers (Peter)
- Deduplicate channel params with a macro (Peter)
- Mention the i2c client address options (Peter)
- Whitespace and other trivial nits (Peter)

Changes since v2:
- Change naming from mcp4xxx_dpot to mcp4531 (Daniel)
- Added links to datasheet in commit message and source (Daniel)
- Rename from pot to potentiometer (Daniel, Crt)
- Use IIO_RESISTANCE instead of IIO_STEPS (Crt, Lars-Peter)
- Don't use wildcards in MAINTAINERS and point to the iio list (Crt)
- Avoid races by not caching values (Crt)
- Spell Microchip correctly (Andreas)

Changes since v1:
- Make it an IIO driver instead (Greg)
- Don't convolute the code with big obscure macros (Greg)
- Inline the bits from mcp4xxx_dpot.h that are actually used
  and drop that file (me)
- Better Changelog (Greg)

Cheers,
Peter

Peter Rosin (2):
  iio: resistance: Document that resistance can be output
  iio: mcp4531: Driver for Microchip digital potentiometers

 Documentation/ABI/testing/sysfs-bus-iio |    2 +
 MAINTAINERS                             |    6 +
 drivers/iio/Kconfig                     |    1 +
 drivers/iio/Makefile                    |    1 +
 drivers/iio/potentiometer/Kconfig       |   20 +++
 drivers/iio/potentiometer/Makefile      |    6 +
 drivers/iio/potentiometer/mcp4531.c     |  228 +++++++++++++++++++++++++++++++
 7 files changed, 264 insertions(+)
 create mode 100644 drivers/iio/potentiometer/Kconfig
 create mode 100644 drivers/iio/potentiometer/Makefile
 create mode 100644 drivers/iio/potentiometer/mcp4531.c

-- 
1.7.10.4

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