[PATCH v3 0/5] Add support for pressure sensor Bosch BMP380

From: Angel Iglesias
Date: Sun Jul 10 2022 - 05:14:46 EST

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

Patch 1 adds references and sensor id to the devicetree bindings docs.
Patch 2 adds references to the new sensors on the Kconfig file.
Patch 3 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 4 adds the basic logic to initialize and read measurements from
the sensor.
Patch 5 adds advanced configurable features such as sampling frequency
and IIR filter through the IIO sysfs ABI.

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 ocurred 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

Previous versions:
v2: https://patchwork.kernel.org/project/linux-iio/list/?series=656144
v1: https://patchwork.kernel.org/project/linux-iio/list/?series=653822

Angel Iglesias (5):
dt-bindings: iio: pressure: bmp085: Add BMP380 compatible string
iio: pressure: Kconfig: Add references to BMP380
iio: pressure: bmp280: simplify driver initialization logic
iio: pressure: bmp280: Add support for BMP380 sensor family
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 | 718 +++++++++++++++++-
drivers/iio/pressure/bmp280-i2c.c | 5 +
drivers/iio/pressure/bmp280-regmap.c | 55 ++
drivers/iio/pressure/bmp280-spi.c | 5 +
drivers/iio/pressure/bmp280.h | 83 ++
7 files changed, 831 insertions(+), 45 deletions(-)

base-commit: e5524c2a1fc4002a52e16236659e779767617a4f