[PATCH 0/2] iio: temperature: ltc2983: Add support for ADT7604

[Liviu Stan]

This series adds support for the ADT7604 multi-sensor temperature
measurement and leak detection system to the existing ltc2983 driver.

The ADT7604 shares the same die as the LTC2984, reusing its register
map and SPI interface. It repurposes the custom RTD sensor type (18)
as a copper trace resistance sensor and the custom thermistor type (27)
as a leak detector, removing thermocouple, diode and direct ADC support.

Patch 1 updates the device tree bindings: adds adi,adt7604 compatible,
copper-trace@ and leak-detector@ sensor node types with their respective
properties, and an ADT7604 example.

Patch 2 updates the driver: adds adt7604_chip_info with a has_copper_trace
capability flag, the resistance result register bank (0x0060-0x00AF),
hardcoded sensor configuration for both new sensor types, sub-ohm copper
trace support, unsupported sensor type rejection at probe, and IIO_RESISTANCE
channels with appropriate scales (1/1,024,000 for copper trace, 1/1024 for
leak detector).

Tested on EVAL-ADT7604-AZ connected to Raspberry Pi 5 via SPI.

Liviu Stan (2):
  dt-bindings: iio: temperature: Add ADT7604 support to adi,ltc2983
  iio: temperature: ltc2983: Add support for ADT7604

 .../bindings/iio/temperature/adi,ltc2983.yaml | 170 ++++++++-
 drivers/iio/temperature/ltc2983.c             | 347 +++++++++++++-----
 2 files changed, 418 insertions(+), 99 deletions(-)

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2.43.0