[PATCH v3 0/2] Support for Texas Instruments OPT4060 RGBW Color sensor.

[Per-Daniel Olsson]

This patch series adds support for Texas Instruments OPT4060 RGBW Color sensor
using the i2c interface.

The driver exposes both raw adc values and sensor compensated values through
sysfs. Integration time can be configured through sysfs as well. The OPT4060
sensor supports both rising and falling threshold interrupts. These interrupts
are exposed as IIO events. The driver also implements an IIO triggered buffer
with two triggers, one trigger for conversion ready interrupts and one trigger
for threshold interrupts. The typical use case for this is to define a threshold
and listen for the events, and at the same time enable the triggered buffer with
the threshold trigger. Once the application gets the threshold event, the values
from the time of the event will be available in the triggered buffer. This
limits the number of interrupts between sensor and host and also the the usage
of sysfs for reading values after events.

Changes in v3:
- Cover letter: Removed lux from description.
- OPT_4060_DRV_NAME define removed.
- Corrected alignment for struct opt4060_buffer.
- Added description of the CRC calculation.
- Cleaned variable declaration in several places.
- Added a path for the non-irq case in opt4060_read_chan_value(...).
- Added a description of processed values.
- Use of regmap_clear_bits in opt4060_power_down(...).
- Switched to IIO_INTENSITY instead of IIO_LIGHT.
- Correction of channel index in IIO_UNMOD_EVENT_CODE, found by test robot.
- Added iio_chan_spec for the non-irq case without events.
- Fixed braces in a few if-else statements.
- Refactoring with early returns in a few places to reduce indentation.
- Replaced for_each_set_bit with iio_for_each_active_channel.
- Removed various too obvious comments.
- Fixed various other code style problems.
- Link to V2: https://lore.kernel.org/lkml/20241005165119.3549472-1-perdaniel.olsson@xxxxxxxx/

Changes in v2:
- dt-bindings: Removed incorrect allOf.
- dt-bindings: Changed to generic node name.
- Correction in opt4060_trigger_one_shot(...) for continuous mode.
- Correction in opt4060_power_down(...), wrong register was read.
- Corrected usage of active_scan_mask in opt4060_trigger_handler(...).
- Clean-up of various comments.
- Link to V1: https://lore.kernel.org/lkml/20241003164932.1162049-1-perdaniel.olsson@xxxxxxxx/

Per-Daniel Olsson (2):
  dt-bindings: iio: light: Document TI OPT4060 RGBW sensor
  iio: light: Add support for TI OPT4060 color sensor

 .../bindings/iio/light/ti,opt4060.yaml        |   51 +
 drivers/iio/light/Kconfig                     |   13 +
 drivers/iio/light/Makefile                    |    1 +
 drivers/iio/light/opt4060.c                   | 1243 +++++++++++++++++
 4 files changed, 1308 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/light/ti,opt4060.yaml
 create mode 100644 drivers/iio/light/opt4060.c


base-commit: eca631b8fe808748d7585059c4307005ca5c5820
--
2.39.5