linux-kernel - [PATCH v4 0/2] iio: pressure: add Honeywell ABP2 driver

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Message-Id: <20251207-honeywell_abp2_driver-v4-0-b52a4b96bbf7@subdimension.ro>
Date: Sun, 07 Dec 2025 08:00:46 +0200
From: Petre Rodan <petre.rodan@...dimension.ro>
To: Jonathan Cameron <jic23@...nel.org>, 
 David Lechner <dlechner@...libre.com>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Andy Shevchenko <andy@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-iio@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Petre Rodan <petre.rodan@...dimension.ro>
Subject: [PATCH v4 0/2] iio: pressure: add Honeywell ABP2 driver

Adds driver for digital Honeywell ABP2 series of board mount
pressure and temperature sensors.

This driver differs quite a bit from the Honeywell ABP series that
is already present in the kernel:

- many more pressure-triplet variations of pressure ranges and
units
- extra end of conversion interrupt feature
- implements both i2c and SPI interfaces
- uses a bidirectional data retrieving protocol (4 wire SPI instead of 3 wire)
- 24+24bit resolution vs 14+11bit on the ABP

Specific low level i2c and spi data transfer API is used instead
of regmap because the protocol is based on simple commands instead
of on a memory map.

Given the fact that the sensor can perform gage and differential
pressure measurements with a full-scale range of down to 500 pascals
the offset and scale are calculated in such a way to provide a result
in pascals, not kilopascals. Just like the Honeywell MPR driver.
For a kilopascal output the scale representation would lose too much
precision.

Tested on two sensors (ABP2MRRT001PDSA3 and ABP2DANT001BA2A3)

Datasheet: https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/basic-abp2-series/documents/sps-siot-abp2-series-datasheet-32350268-en.pdf
Signed-off-by: Petre Rodan <petre.rodan@...dimension.ro>
---
v1 -> v2:
 - bindings are unchanged, added tag from Krzysztof
 - driver code changes based on Andy's feedback - detailed list in the respective patch
v2 -> v3:
 - driver code changes based on Andy's feedback - detailed list in the respective patch
v3 -> v4
 - driver code changes based on Jonathan's feedback - detailed list in the respective patch
 - Link to v3: https://lore.kernel.org/r/20251204-honeywell_abp2_driver-v3-0-ad3275bad35e@subdimension.ro

---
Petre Rodan (2):
      dt-bindings: iio: pressure: add honeywell,abp2030pa
      iio: pressure: add Honeywell ABP2 driver

 .../bindings/iio/pressure/honeywell,abp2030pa.yaml | 132 +++++
 MAINTAINERS                                        |   7 +
 drivers/iio/pressure/Kconfig                       |  29 ++
 drivers/iio/pressure/Makefile                      |   3 +
 drivers/iio/pressure/abp2030pa.c                   | 544 +++++++++++++++++++++
 drivers/iio/pressure/abp2030pa.h                   |  73 +++
 drivers/iio/pressure/abp2030pa_i2c.c               |  90 ++++
 drivers/iio/pressure/abp2030pa_spi.c               |  67 +++
 8 files changed, 945 insertions(+)
---
base-commit: f9e05791642810a0cf6237d39fafd6fec5e0b4bb
change-id: 20251122-honeywell_abp2_driver-9c796ef0c4b2

Best regards,
-- 
Petre Rodan <petre.rodan@...dimension.ro>