iio: mpl3115: add support for DRDY interrupt

Hello,
This set of patches adds support for the DRDY interrupt in the MPL3115 pressure sensor. The device has 2 interrupt lines, hence the new binding. I also added support for the sampling frequency which determines the time interval between subsequent measurements (in the continuous measurements mode) so it's obiously tied to the DRDY interrupt feature.

Kind regards,
Antoni Pokusinski

---
Changes since v3:
* P2: created mpl3115_fill_trig_buffer
* P2: trigger_handler: replaced scoped_guard with mutex_lock
* P2: includes: removed linux/cleanup.h

* P3: new patch: renamed MPL3115_CTRL_* macros to MPL3115_CTRL1_*

* P4: extracted the MPL3115_CTRL_* renames into a separate patch (P3 now)
* P4: trigger_probe: placed devm_request_threaded_irq() call before devm_iio_trigger_register()
* P4: trigger_probe: removed switch(irq_cfg_flags) together with the enum mpl3115_irq_type and added 2 separate variables to handle interrupt setup logic
* P4: set_trigger_state: factored out the CTRL_REG1 and CTRL_REG4 writes into a separate function mpl3115_config_interrupt

* P5: samp_freq_table: added spaces before "},"

Changes since v2:
* P4: included linux/bitfield.h

Changes since v1:
* P1: add vdd-supply and vddio-supply

* P2: new patch: use guards from cleanup.h

* P3: change macros of control register bits to convention

      MPL3115_CTRLX_NAME

* P3: MPL3115_PT_DATA_EVENT_ALL: use GENMASK
* P3: trigger_probe: do not fail if dev_fwnode() returns NULL
* P3: trigger_probe: use devm_iio_trigger_register()
* P3: trigger_probe: introduced enum mpl3115_irq_type and changed IRQ setup logic accordingly

* P4: MPL3115_CTRL2_ST: use GENMASK
* P4: read_raw: samp_freq: use FIELD_GET
* P4: write_raw: samp_freq: use FIELD_PREP
---

Antoni Pokusinski (5):
dt-bindings: iio: pressure: add binding for mpl3115
iio: mpl3115: add separate function for triggered buffer data
collection
iio: mpl3115: rename CTRL_REG1 field macros
iio: mpl3115: add support for DRDY interrupt
iio: mpl3115: add support for sampling frequency

 .../bindings/iio/pressure/fsl,mpl3115.yaml    |  71 ++++
 .../devicetree/bindings/trivial-devices.yaml  |   2 -
 drivers/iio/pressure/mpl3115.c                | 331 ++++++++++++++++--
 3 files changed, 364 insertions(+), 40 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/iio/pressure/fsl,mpl3115.yaml

2.25.1