[PATCH 0/2] iio: pressure: add driver and bindings for adp810

[Akhilesh Patil <akhilesh@ee.iitb.ac.in>]

This patch series adds support for aosong adp810 differential pressure and
temperature sensor driver in the IIO subsystem.

Patch 1: Adds bindings for this hardware.
Patch 2: Adds driver code with device tree support.

Overview of adp810:
This is digital differential pressure and temperature sensor from aosong under
the brand name of ASAIR. This sensor can measure pressure from -500 to +500Pa
and temperature from -40 to +85 degree. It provides simple protocol to measure
readings over I2C bus interface.

How to read from sensor (Protocol)?
To read from sensor, i2c master needs to send measure command 0x372d to
start the data acquisition. Then host/master should wait for minimum 10ms for data
to be ready before reading. Post this delay i2c master can read 9 bytes of
measurement data which includes - pressure(u16): crc(u8): temperature(u16): crc(u8)
scale factor (u16): crc(8).
Host/master can optionally verify crc for data integrity. Read sequence can be
terminated anytime by sending NAK.

Datasheet: https://aosong.com/userfiles/files/media/Datasheet%20ADP810-Digital.pdf

Testing:
Driver is tested on Texas Instruments am62x sk board by connecting sensor at i2c-2.
Data communication is validated with i2c bus at 100KHz and 400KHz using logic analyzer.
Sensor values are read using iio subsystem's sysfs interface.

Looking forward for feedback and suggestions.

Regards,
Akhilesh

Akhilesh Patil (2):
  dt-bindings: iio: pressure: Add Aosong adp810
  iio: pressure: adp810: Add driver for adp810 sensor

 .../bindings/iio/pressure/aosong,adp810.yaml  |  46 ++++
 MAINTAINERS                                   |   7 +
 drivers/iio/pressure/Kconfig                  |  12 +
 drivers/iio/pressure/Makefile                 |   1 +
 drivers/iio/pressure/adp810.c                 | 205 ++++++++++++++++++
 5 files changed, 271 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/pressure/aosong,adp810.yaml
 create mode 100644 drivers/iio/pressure/adp810.c

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2.34.1