[RFC PATCH v1 0/4] iio: add Sensirion SLF3x liquid flow sensor support

[Wadim Mueller <wafgo01@gmail.com>]

From: Wadim Mueller <wadim.mueller@cmblu.de>

Hi all,

this RFC adds support for the Sensirion SLF3x family of liquid-flow
sensors (SLF3S-0600F and SLF3S-4000B).  Before I send it as a normal
patch I'd like to ask three things:

1. Subsystem.  Liquid-flow sensors don't seem to have a home in
   mainline yet.  iio/ feels like the natural place for me, but
   please correct me if hwmon (or somewhere else) is prefered.

2. Channel type.  IIO has no flow channel type so far.  The series
   adds IIO_VOLUMEFLOW with _scale in litres per second per LSB,
   so drivers reporting smaller units only need a fractional scale.
   IIO_MASSFLOW (for gas-flow sensors) was left out on purpose --
   happy to add it in the same series if that's more usefull.

3. Subdirectory.  I put the driver in a new drivers/iio/flow/
   since there is no flow subsytem in iio yet.  If colocating with
   drivers/iio/pressure/ (next to sdp500) is preferred I'll respin.

Patches:

  1/4  iio: types: add IIO_VOLUMEFLOW channel type
  2/4  dt-bindings: iio: flow: add sensirion,slf3s binding
  3/4  iio: flow: add Sensirion SLF3x driver
  4/4  MAINTAINERS: add entry

Tested with a SLF3S-0600F on a TI AM64x platform.

Thanks,
Wadim

Wadim Mueller (4):
  iio: types: add IIO_VOLUMEFLOW channel type
  dt-bindings: iio: flow: add Sensirion SLF3x liquid flow sensor
  iio: flow: add Sensirion SLF3x liquid flow sensor driver
  MAINTAINERS: add entry for Sensirion SLF3x flow sensor driver

 Documentation/ABI/testing/sysfs-bus-iio       |  17 ++
 .../bindings/iio/flow/sensirion,slf3s.yaml    |  49 ++++
 MAINTAINERS                                   |   7 +
 drivers/iio/Kconfig                           |   1 +
 drivers/iio/Makefile                          |   1 +
 drivers/iio/flow/Kconfig                      |  22 ++
 drivers/iio/flow/Makefile                     |   7 +
 drivers/iio/flow/slf3x.c                      | 264 ++++++++++++++++++
 drivers/iio/industrialio-core.c               |   1 +
 include/uapi/linux/iio/types.h                |   1 +
 tools/iio/iio_event_monitor.c                 |   2 +
 11 files changed, 372 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/flow/sensirion,slf3s.yaml
 create mode 100644 drivers/iio/flow/Kconfig
 create mode 100644 drivers/iio/flow/Makefile
 create mode 100644 drivers/iio/flow/slf3x.c


base-commit: 3cd8b194bf3428dfa53120fee47e827a7c495815
-- 
2.52.0