[PATCH v6 0/9] Add support for pressure sensor Bosch BMP380

[Angel Iglesias]

This patchset adds BMP380 variant to the already existing drivers for
the Bosch BMP180/280 pressure sensors.

Patch 1 reorder local variables declarations following reverse xmas tree
conventions, as suggested by Andy Shevchenko <andy.shevchenko@xxxxxxxxx>.
Patch 2 migrates existing code to use FIELD_GET/FIELD_PREP and GENMASK
utilities.
Patch 3 is a minor refactor of the function that loads bmp280 calibration
params, taking advantage of the data contiguity in memory.
Patch 4 is a minor refactor simplifying driver initialization logic
to facilitate the integration of the new sensor variant extending the
information stored in the "chip_info" struct.
Patch 5 fixes DMA unsafe regmap_bulk_* calls reported by Jonathan Cameron
<jic23@xxxxxxxxxx>.
Patch 6 is a minor refactor reordering device match tables declarations in
forward order as suggested by Andy Shevchenko <andy.shevchenko@xxxxxxxxx>.
Patch 7 adds the basic logic to initialize and read measurements from
the sensor.
Patch 8 adds references and sensor id to the devicetree bindings docs.
Patch 9 adds advanced configurable features such as sampling frequency
and IIR filter through the IIO sysfs ABI.

Changes in v6:
 - Introduced patch 1 reordering local variables declarations.
 - Patch 2 is separated form v5 patch 1, separating initialization
   refactor from migration to FIELD_GET, FIELD_PREP and GENMASK.
 - Patch 3 backports a refactor made to bmp280 calibration load
   on v5 patch 2.
 - Introduced patch 6 reordering i2c device match tables declarations.
 - Revised patch 7 and 9 and smoothed transition to patch 9 moving some
   code on v5 patch 5 to patch 7 (BMP380 basic enablement).
 - Cleaned error handling of regmap calls thorough patches.
 - Changed formula used to handle IIR filter on patch 9 following feedback
   made by Andy Shevchenko <andy.shevchenko@xxxxxxxxx>.
 - Made union with data buffers on patch 5 anonymous (suggested by Andy
   Shevchenko <andy.shevchenko@xxxxxxxxx>)
 - Improved handling of be16 and le16 data on patch 5 integrating changes
   suggested by Jonathan Cameron <jic23@xxxxxxxxxx>.

Changes in v5:
 - Moved dt bindings patch (previously patch 2/5) to 4/5 to preserve
   tree coherence as suggested by Jonathan Cameron <jic23@xxxxxxxxxx>
 - Patch 1: Simplified initial oversampling values assignation.
 - Patch 1: Updated codepaths for bmp180 and bmp280 to use FIELD_GET and
   FIELD_GET helpers. Migrated compatible masks to use GENMASK.
 - Patch 2: Store DMA-safe buffers on the device data struct instead of
   using dynamic allocations for calibration buffers.
   Thanks Jonathan Cameron <jic23@xxxxxxxxxx>.
 - Patch 3: Fixed small typos
 - Patch 3: Fixed incompatible division on 32-bit machines reported by
   Andy Shevchenko <andy.shevchenko@xxxxxxxxx> and kernel test robot
   <lkp@xxxxxxxxx>.
 - Patch 3: Fixed inconsistent use of "x" and "X" declaring constants.
 - Patch 5: Dropped incorrect reported-by tag on changelog message.
 - Patch 5: Fixed typos on various comments.

Changes in v4:
 - Patch 4 and 2: Merged v3 patch 2 (Kconfig refs update) into this patch.
 - Patch 3: Added patch fixing unsafe DMA regmap_bulk_* calls reported by
   Jonathan Cameron <jic23@xxxxxxxxxx>.
 - Patch 4: Fixed DMA unsafe buffers used on regmap_bulk_* calls reported
   by Jonathan Cameron <jic23@xxxxxxxxxx>.

Changes in v3:
 - Patch 2: Fixed incorrect abbreviation.
 - Patch 3: use dev_err_probe helper to handle error initializing sensor.
 - Patch 4: Fixed kernel test robot warning provoked by missing include.
 - Patch 4: Fixed bug reported by Dan Carpenter <dan.carpenter@xxxxxxxxxx>.
 - Patch 5: Fixed formatting and typos on multiple comments.
 - Patch 5: Fixed missing boolean initialization reported by
   Andy Shevchenko <andy.shevchenko@xxxxxxxxx>.
 - Patch 5: Replaced duplicated comments with a single comment containing
   a brief explantation in a shared location.
 - Patch 5: Dropped incorrect use of unlikely macro.

Changes in v2:
 - Added patch 2 updating Kconfig with references to new sensor.
 - Patch 3 adds changes proposed by Jonathan Cameron <jic23@xxxxxxxxxx>
   to declutter and unify configuration logic for the different sensors
   extending "chip_info" struct with default configuration parameters.
 - Patch 4: store temperature and pressure adc values on 3 byte array
   instead of using the type __le32. Uses function get_unaligned_le24
   to convert the little-endian encoded 3 byte value to an integer.
 - Patch 4: drops custom macro le16_from_bytes and use get_unaligned_le16.
 - Patch 4: generate masks using GENMASK macro.
 - Patch 4: use FIELD_PREP to generate bitfields for registries.
 - Patch 4: dropped stray formatting change.
 - Patch 5: adds sanity checks in bmp280_read_raw for channel properties
   only available in the BMP380.
 - Patch 5: on bmp280_write_* checks if a problem occurred committing new
   configuration and tries to restore previous working configuration
   to keep the sensor in a previous working state.
 - Patch 5: refactored bmp380_chip_config to only check for configuration
   errors when a configuration change is detected.
 - Patch 5: improved invalid configuration detection on BMP380 restarting
   measurement loop to force a new measurement after the configuration is
   updated.

Previous patch version available on:
 https://lore.kernel.org/all/cover.1659872590.git.ang.iglesiasg@xxxxxxxxx/

Angel Iglesias (9):
  iio: pressure: bmp280: reorder local variables following reverse xmas
    tree
  iio: pressure: bmp280: use FIELD_GET, FIELD_PREP and GENMASK
  iio: pressure: bmp280: Simplify bmp280 calibration data reading
  iio: pressure: bmp280: simplify driver initialization logic
  iio: pressure: bmp280: Fix alignment for DMA safety
  iio: pressure: bmp280: reorder i2c device tables declarations
  iio: pressure: bmp280: Add support for BMP380 sensor family
  dt-bindings: iio: pressure: bmp085: Add BMP380 compatible string
  iio: pressure: bmp280: Add more tunable config parameters for BMP380

 .../bindings/iio/pressure/bmp085.yaml         |   4 +-
 drivers/iio/pressure/Kconfig                  |   6 +-
 drivers/iio/pressure/bmp280-core.c            | 962 +++++++++++++++---
 drivers/iio/pressure/bmp280-i2c.c             |  15 +-
 drivers/iio/pressure/bmp280-regmap.c          |  55 +
 drivers/iio/pressure/bmp280-spi.c             |   5 +
 drivers/iio/pressure/bmp280.h                 | 164 ++-
 7 files changed, 1018 insertions(+), 193 deletions(-)


base-commit: 2f61ff8272967c9bdcba810aa978170814b08f7c
-- 
2.37.3