[PATCH 0/4] iio: pressure: mpl3115: add hardware FIFO support

[SeungJu Cheon <suunj1331@gmail.com>]

The MPL3115A2 pressure/temperature sensor provides a 32-sample
hardware FIFO with watermark interrupt support. This series adds
FIFO support, enabling buffered data acquisition with reduced
interrupt and CPU overheads.

1/4 - Convert to devm-managed resource allocation
2/4 - Clean up interrupt handling and locking
3/4 - Generalize interrupt pin routing
4/4 - Add hardware FIFO support

Tested on Raspberry Pi 4 Model B with an MPL3115A2 breakout board
(I2C1, INT1 on GPIO17, falling edge)
- FIFO circular mode operation
- Watermark interrupt generation
- Buffered pressure/temperature data acquisition
- Buffer enable/disable cycling
- Oneshot reads after FIFO operation

This work builds on the DRDY interrupt, triggered buffer,
sampling frequency, and threshold event support previously
added by Antoni Pokusinski.

SeungJu Cheon (4):
  iio: pressure: mpl3115: convert probe to fully devm managed
  iio: pressure: mpl3115: clean up interrupt handling and locking
  iio: pressure: mpl3115: generalize interrupt pin routing
  iio: pressure: mpl3115: add hardware FIFO support

 drivers/iio/pressure/mpl3115.c | 421 ++++++++++++++++++++++++++-------
 1 file changed, 332 insertions(+), 89 deletions(-)

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2.52.0