[PATCH RFC v5 0/6] iio: add Open Sensor Fusion IIO driver

[Jinseob Kim]

Open Sensor Fusion is a sensor aggregation hub interface.  The Linux IIO
driver receives OSF protocol frames from a serdev-attached device,
discovers supported sensor streams from capability reports, and exposes
the supported raw sensor data through IIO devices.

The initial driver supports protocol major version 0 and the receive path
for accelerometer, gyroscope, magnetometer, and temperature samples.  The
current wire magic is OSF0, but OSF0 is a wire-format detail and not the
Linux driver identity.  Protocol compatibility is carried by the
protocol_major and protocol_minor fields in the fixed OSF frame header.

This is still RFC because the driver-facing OSF protocol subset, the
compatible binding, and future protocol compatibility rules are being
reviewed.

Runtime testing was done with an OSF GREEN prototype connected to a
Raspberry Pi over UART.  The driver registered osf-accel, osf-gyro,
osf-magn, and osf-temp IIO devices.  Direct raw reads and software kfifo
buffer reads were tested.

Changes since v4:
- Regenerated the series as a full standalone replacement series from a
  clean upstream base.
- Removed previous-version add/delete churn from the generated series.
- Clarified OSF0, protocol_major, and protocol_minor compatibility
  handling.
- Added required vcc-supply support to the binding.
- Added probe-time regulator enablement with devm_regulator_get_enable().
- Added the opensensorfusion vendor prefix.
- Fixed checkpatch cleanup issues in commit messages and driver style.

Jinseob Kim (6):
  dt-bindings: iio: add Open Sensor Fusion device
  Documentation: iio: add Open Sensor Fusion driver overview
  iio: osf: add protocol decoding
  iio: osf: add stream parser
  iio: osf: add UART transport
  iio: osf: register IIO devices from capabilities

 .../bindings/iio/opensensorfusion,osf.yaml    |  59 ++++
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 Documentation/iio/index.rst                   |   1 +
 Documentation/iio/open-sensor-fusion.rst      |  71 ++++
 MAINTAINERS                                   |  13 +
 drivers/iio/Kconfig                           |   1 +
 drivers/iio/Makefile                          |   1 +
 drivers/iio/opensensorfusion/Kconfig          |  14 +
 drivers/iio/opensensorfusion/Makefile         |   6 +
 drivers/iio/opensensorfusion/osf_core.c       | 306 ++++++++++++++++++
 drivers/iio/opensensorfusion/osf_core.h       |  70 ++++
 drivers/iio/opensensorfusion/osf_iio.c        | 275 ++++++++++++++++
 drivers/iio/opensensorfusion/osf_iio.h        |  22 ++
 drivers/iio/opensensorfusion/osf_protocol.c   | 249 ++++++++++++++
 drivers/iio/opensensorfusion/osf_protocol.h   |  97 ++++++
 drivers/iio/opensensorfusion/osf_serdev.c     | 117 +++++++
 drivers/iio/opensensorfusion/osf_stream.c     | 187 +++++++++++
 drivers/iio/opensensorfusion/osf_stream.h     |  31 ++
 18 files changed, 1522 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/opensensorfusion,osf.yaml
 create mode 100644 Documentation/iio/open-sensor-fusion.rst
 create mode 100644 drivers/iio/opensensorfusion/Kconfig
 create mode 100644 drivers/iio/opensensorfusion/Makefile
 create mode 100644 drivers/iio/opensensorfusion/osf_core.c
 create mode 100644 drivers/iio/opensensorfusion/osf_core.h
 create mode 100644 drivers/iio/opensensorfusion/osf_iio.c
 create mode 100644 drivers/iio/opensensorfusion/osf_iio.h
 create mode 100644 drivers/iio/opensensorfusion/osf_protocol.c
 create mode 100644 drivers/iio/opensensorfusion/osf_protocol.h
 create mode 100644 drivers/iio/opensensorfusion/osf_serdev.c
 create mode 100644 drivers/iio/opensensorfusion/osf_stream.c
 create mode 100644 drivers/iio/opensensorfusion/osf_stream.h

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2.43.0