[PATCH v3 0/5] iio: pressure: dps310: add Zilltek ZTS8032

[Paulius Zaleckas <paulius.zaleckas@gmail.com>]

The Zilltek ZTS8032 is a register compatible DPS310 with two more
pressure calibration coefficients (c31, c40) and a different TMP_CFG
layout.

1-2: Vendor prefix and the zilltek,zts8032 compatible.
3: Per-chip data in the I2C and ACPI match data, no functional change.
4: OF match table.
5: ZTS8032 chip data: the coefficient count, the TMP_CFG startup value,
   and a Horner step each for c40 and c31.

Based on iio/testing, on top of a22dc7ebb21a ("iio: pressure: dps310:
fix overflow in pressure compensation"). That fix replaces v2's patch 1,
and patch 5 extends its Horner evaluation.

There is no public ZTS8032 datasheet.

Testing: ZTS8032 on an arm64 (MT7987) board, the series and a22dc7ebb21a
backported to 6.12. in_pressure_input matches the datasheet formula
evaluated from the raw and coefficient registers to within 1 Pa at every
oversampling rate from 1 to 128, and TMP_CFG reads 0x00 after probe.
Every patch builds without warnings with W=1 on x86_64 and i386,
dt_binding_check passes. I have no DPS310, so patches 3-4 are untested
on one.

An LLM coding assistant (Claude Code) was used for this series: it
ported the ZTS8032 support from the vendor driver, wrote the code and
changelogs and the hardware test scripts, under my direction. I
reviewed and tested the result.

Changes in v3:
- Drop v2 1/6, superseded by a22dc7ebb21a in iio/testing; rebase onto
  it and add c40 and c31 as Horner steps. This also covers the Sashiko
  overflow report on v2 1/6.
- C99 initializers for the ACPI ID (Andy, Uwe)
- Add DPS310_MAX_COEF_LEN in patch 3 and bump it in patch 5 (Andy)
- Parse c31/c40 based on a chip flag, not the coefficient count (Andy)
- List the supported sensors one per line in Kconfig (Andy)
- Link to v2: https://lore.kernel.org/r/20261013112124.1878296-1-paulius.zaleckas@gmail.com

Changes in v2:
- Split the driver patch into per-chip data, OF match table and
  ZTS8032 support (Andy)
- Drop the linux/mod_devicetable.h include (Andy, Uwe)
- Return -ENODATA when there is no match data (Andy)
- Add Conor's Acked-by to the bindings
- Link to v1: https://lore.kernel.org/r/20261012114550.1680054-1-paulius.zaleckas@ui.com

Paulius Zaleckas (5):
  dt-bindings: vendor-prefixes: Add ZillTek Technology
  dt-bindings: iio: pressure: infineon,dps310: Add Zilltek ZTS8032
  iio: pressure: dps310: add per-chip data
  iio: pressure: dps310: add an OF match table
  iio: pressure: dps310: add Zilltek ZTS8032 support

 .../iio/pressure/infineon,dps310.yaml         |  4 +-
 .../devicetree/bindings/vendor-prefixes.yaml  |  2 +
 drivers/iio/pressure/Kconfig                  |  6 +-
 drivers/iio/pressure/dps310.c                 | 73 ++++++++++++++++---
 4 files changed, 72 insertions(+), 13 deletions(-)


base-commit: a22dc7ebb21a6bd4c8b63bc2c1dd46a24945aae7
-- 
2.55.0