[PATCH v3 0/2] iio: add unit converter

[Peter Rosin]

Hi!

This driver implements support for voltage dividers and current
sense shunts. It's pretty generic and should be easily adaptable
to other linear scaling purposes.

Cheers,
Peter

Changes since v2:    https://lkml.org/lkml/2018/4/3/461
- Rename from current-sence-circuit to current-sense-shunt (this
  should also fix all the typing problems I had with curciut).
- Describe the shunt resistance directly (instead of indirectly
  in the form of a quotient).
- Add a ->props() op to struct unit_converter_cfg to enable simple
  separation of properties for different converters.
- Shuffle the code around to minimize forward declarations.
- Drop the unused indio member from struct unit_converter.
- Drop error report on iio driver registration failure.

Changes since v1:    https://lkml.org/lkml/2018/3/19/801
- Put the driver in the new afe category (Analog Front Ends) and do not
  move the iio-mux driver.
- Do not refer to the source channel as "parent", use "source" instead.
- Have the DT compatible drive the target unit, instead of relying on a
  "type" DT-property for that.
- In the DT bindings, use an unnamed source channel.
- Do not set up writes to _RAW (sorry Phil) as I don't need it and have
  not tested it. It's easy to add back if needed.
- Fail if the source channel does not support _RAW or _SCALE.
- Fix various spelling issues.
- Fix various code style issues.

Peter Rosin (2):
  dt-bindings: iio: afe: add current-sense-shunt and voltage-divider
  iio: afe: unit-converter: new driver

 .../bindings/iio/afe/current-sense-shunt.txt       |  41 +++
 .../bindings/iio/afe/voltage-divider.txt           |  45 ++++
 MAINTAINERS                                        |   8 +
 drivers/iio/Kconfig                                |   1 +
 drivers/iio/Makefile                               |   1 +
 drivers/iio/afe/Kconfig                            |  18 ++
 drivers/iio/afe/Makefile                           |   6 +
 drivers/iio/afe/iio-unit-converter.c               | 291 +++++++++++++++++++++
 8 files changed, 411 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/afe/current-sense-shunt.txt
 create mode 100644 Documentation/devicetree/bindings/iio/afe/voltage-divider.txt
 create mode 100644 drivers/iio/afe/Kconfig
 create mode 100644 drivers/iio/afe/Makefile
 create mode 100644 drivers/iio/afe/iio-unit-converter.c

-- 
2.11.0