[PATCH v5 0/4] iio: flow: Sensirion SLF3S liquid flow sensor

[Wadim Mueller <wafgo01@gmail.com>]

Hi all,

this series adds a driver for the Sensirion SLF3S family of I2C liquid
flow sensors (SLF3S-0600F / -1300F / -4000B) and a new IIO_VOLUMEFLOW
channel type.

The series is now based on iio.git testing, which already contains
Rodrigo Alencar's IIO_VAL_DECIMAL64_* core formatting work, so the
external dependency listed in v4 is gone.  Patch 3/4 adds the
IIO_VAL_DECIMAL64_FEMTO format type on top of it.

The compatible/fallback layout of the dt-binding is intentionally
unchanged from v4 while the discussion on the v4 thread about the
preferred fallback scheme is still open:

  https://lore.kernel.org/linux-iio/20260621145117.70b2d50e@jic23-huawei/

Changes since v4
----------------
  * rebased onto iio.git testing; trivial conflict with the new
    IIO_COVERAGE entries in the channel-type lists resolved (1/4)
  * driver: include err.h for PTR_ERR() and math.h for struct
    s32_fract, per Andy
  * driver: fold the per-variant scale_num/scale_den pair into a
    struct s32_fract, per Andy
  * driver: add enum slf3s_variant_id and use it for the variant
    table and the I2C/OF match tables instead of bare indices, per
    Andy
  * driver: slf3s_send_cmd(): drop the "at_least 2" parameter
    annotation, decouple the ret assignment from its declaration and
    check errors first, per Andy
  * driver: use sizeof() instead of ARRAY_SIZE() for the measurement
    byte buffer, per Andy
  * driver: parenthesise the (FEMTO / MILLI) factor so it folds into
    a single constant multiplication, per Andy
  * driver: derive the temperature scale from MILLIDEGREE_PER_DEGREE
    instead of a bare 1000, per Andy
  * driver: checked the struct slf3s_data layout (re Andy's pahole
    question): the non-pointer members total 260 bytes, so one 4-byte
    hole remains for any member order; left as is
  * driver: drop the inline comment on the mutex that duplicated the
    kernel-doc, per Jonathan
  * driver: fix the duplicated argument in the DT/sensor variant
    mismatch dev_info(), per Jonathan
  * driver: reformat the i2c_device_id/of_device_id tables to one
    member per line, per Jonathan
  * MAINTAINERS: updated Maxwells address in the R: entry to
    maxwell@maxwelld.cc, as he requested on the v4 thread

The signaling-flags word (air-in-line / high-flow / smoothing status) in
each measurement frame is intentionally not read; exposing it can be a
later follow-up.

Thanks,
Wadim

Wadim Mueller (4):
  iio: types: add IIO_VOLUMEFLOW channel type
  dt-bindings: iio: flow: add Sensirion SLF3S liquid flow sensor
  iio: core: add IIO_VAL_DECIMAL64_FEMTO format type
  iio: flow: add Sensirion SLF3S liquid flow sensor driver

 Documentation/ABI/testing/sysfs-bus-iio       |  11 +
 Documentation/ABI/testing/sysfs-bus-iio-flow  |  21 +
 .../bindings/iio/flow/sensirion,slf3s.yaml    |  58 ++
 MAINTAINERS                                   |   8 +
 drivers/iio/Kconfig                           |   1 +
 drivers/iio/Makefile                          |   1 +
 drivers/iio/flow/Kconfig                      |  22 +
 drivers/iio/flow/Makefile                     |   7 +
 drivers/iio/flow/slf3s.c                      | 541 ++++++++++++++++++
 drivers/iio/industrialio-core.c               |   3 +
 include/linux/iio/types.h                     |   1 +
 include/uapi/linux/iio/types.h                |   1 +
 tools/iio/iio_event_monitor.c                 |   2 +
 13 files changed, 677 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-flow
 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/slf3s.c


base-commit: a50909aa46dec46de3c73235fc15a7d6f763d996
-- 
2.43.0