Add the dt-bindings and the driver for ADXL355 3-axis MEMS Accelerometer.

Changes since v0:
1. Move adxl355_hpf_3db_table to adxl355_data structure. This is done to make
sure that each device gets its own table.
2. Make local regmap definitions private to adxl355_core.c.
3. Other minor coding style changes.

Puranjay Mohan (2):
  dt-bindings: iio: accel: Add ADXL355 in trivial-devices
  iio: accel: Add driver support for ADXL355

 .../devicetree/bindings/trivial-devices.yaml  |   2 +
 MAINTAINERS                                   |   7 +
 drivers/iio/accel/Kconfig                     |  29 +
 drivers/iio/accel/Makefile                    |   3 +
 drivers/iio/accel/adxl355.h                   |  83 +++
 drivers/iio/accel/adxl355_core.c              | 541 ++++++++++++++++++
 drivers/iio/accel/adxl355_i2c.c               |  63 ++
 drivers/iio/accel/adxl355_spi.c               |  66 +++
 8 files changed, 794 insertions(+)
 create mode 100644 drivers/iio/accel/adxl355.h
 create mode 100644 drivers/iio/accel/adxl355_core.c
 create mode 100644 drivers/iio/accel/adxl355_i2c.c
 create mode 100644 drivers/iio/accel/adxl355_spi.c

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2.30.1