[PATCH v2 0/3] BMI270: Add support for step counter and motion events

[Gustavo Silva <gustavograzs@gmail.com>]

This series adds support for step counter and motion events using
interrupts in the BMI270 driver.

The step counter can be enabled, disabled, and configured with a
watermark, all from userspace.

Any-motion and no-motion events are generated by detecting changes
in acceleration on each axis.

Signed-off-by: Gustavo Silva <gustavograzs@gmail.com>
---
Changes in v2:
- Reduce the scope of mutex lock when clearing the step counter
- Change the type of the 'steps_enabled' variable from int to bool
- Add a new DMA safe variable to the device's private data to access the
  feature registers
- Remove unnecessary mutex lock
- Fix a build error found by the kernel test robot by initializing a
  local variable in the `bmi270_update_feature_reg()` function
- Remove dead code in the `bmi270_write_event_config()` function
- Add macro definitions and corresponding datasheet references for
  relevant constants: step counter maximum value, step counter factor,
  and threshold upper limit
- Remove the event bitmask from the device's private data. Read the
  registers directly to retrieve this information instead
- Use IIO_UNMOD_EVENT_CODE instead of IIO_MOD_EVENT_CODE where
  appropriate
- Fix shadowed error codes
- Change motion event to be enabled on a per-axis basis
- Create pseudo channel of type accel_x&y&z for the no-motion event
- Change no-motion event type to IIO_EV_TYPE_ROC
- Link to v1: https://lore.kernel.org/r/20250424-bmi270-events-v1-0-a6c722673e5f@gmail.com

---
Gustavo Silva (3):
      iio: imu: bmi270: add channel for step counter
      iio: imu: bmi270: add step counter watermark event
      iio: imu: bmi270: add support for motion events

 drivers/iio/imu/bmi270/bmi270_core.c | 612 ++++++++++++++++++++++++++++++++++-
 1 file changed, 609 insertions(+), 3 deletions(-)
---
base-commit: b475195fecc79a1a6e7fb0846aaaab0a1a4cb2e6
change-id: 20250424-bmi270-events-74c6ef5f4243

Best regards,
-- 
Gustavo Silva <gustavograzs@gmail.com>