[PATCH v2 0/3] iio: chemical: Add Sharp GP2Y1010AU0F dust sensor support

[surajsonawane0215]

From: Suraj Sonawane <surajsonawane0215@xxxxxxxxx>

This patch series adds support for the Sharp GP2Y1010AU0F optical
dust sensor, which measures airborne particulate matter concentration
in grams per cubic meter (g/m³). The implementation includes:

1. A new IIO_DENSITY channel type for particulate sensors (Patch 1)
2. Device tree bindings documentation (Patch 2)
3. The driver implementation (Patch 3)

The sensor requires:
- One GPIO for device enable control
- One ADC channel for analog output measurement
- Optional LED trigger for synchronized sampling

Tested on BeagleBone Black with:
- P8_12 (GPIO_44) for LED control
- P9_39 (AIN0) for analog output

Changes since v1:
- Added new IIO_DENSITY channel type (Patch 1)
- Documented ABI for density measurements (g/m³) in sysfs-bus-iio
- Updated timing properties to match datasheet:
  * sharp,led-on-delay-us: 280μs (from 40μs)
  * sharp,measurement-window-us: 280μs (from 200μs)
- Added reg property for multi-sensor support
- Moved datasheet reference to tags block
- Hardware Interface:
  * Replaced manual power management with devm_regulator_get_enabled()
  * Consolidated LED timing into single delay operation
  * Improved error handling in read sequence
- Removed unnecessary IIO_BUFFER dependencies
- Alphabetized Makefile entry and header includes
- Replaced extend_name with proper label callback
- Standardized on pdev->dev for all device logging
- Applied IIO formatting conventions ({ } spacing)
- Changed IIO_VOLTAGE → IIO_DENSITY channel type
- Updated all timing values to datasheet specifications

V1: [PATCH 1/2] https://lore.kernel.org/lkml/20250425215149.49068-1-surajsonawane0215@xxxxxxxxx/
    [PATCH 2/2] https://lore.kernel.org/lkml/20250425221214.50255-1-surajsonawane0215@xxxxxxxxx/

Thanks!
Suraj Sonawane

Suraj Sonawane (3):
  iio: Add IIO_DENSITY channel type
  dt-bindings: iio: chemical: Add sharp,gp2y1010au0f
  iio: chemical: Add driver for Sharp GP2Y1010AU0F

 Documentation/ABI/testing/sysfs-bus-iio       |   8 ++
 .../iio/chemical/sharp,gp2y1010au0f.yaml      |  78 +++++++++++
 MAINTAINERS                                   |   7 +
 drivers/iio/chemical/Kconfig                  |  10 ++
 drivers/iio/chemical/Makefile                 |   1 +
 drivers/iio/chemical/gp2y1010.c               | 126 ++++++++++++++++++
 include/uapi/linux/iio/types.h                |   1 +
 7 files changed, 231 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/chemical/sharp,gp2y1010au0f.yaml
 create mode 100644 drivers/iio/chemical/gp2y1010.c

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2.43.0