[PATCH v1 0/2] iio: adc: add MAX40080 current-sense amplifier driver

[Stefan Popa <stefan.popa@analog.com>]

This series adds support for the Maxim MAX40080, a bidirectional
current-sense amplifier with an integrated 12-bit ADC and an I2C/SMBus
interface. It measures the voltage across an external shunt resistor and
the input bus voltage.

The driver operates in direct (INDIO_DIRECT_MODE) mode. Each raw read
triggers a single on-demand conversion (SMBus Quick Command) and reads
back the matched current/voltage pair, so results are always fresh. It
exposes the current and voltage channels with raw and scale attributes,
a configurable oversampling (digital averaging) ratio, and PEC-protected
register access. The two selectable current-sense ranges are exposed
through scale/scale_available (the range is chosen by writing the
desired scale); the current scale is derived from the
shunt-resistor-micro-ohms device-tree property.

Continuous FIFO buffering, threshold events and the alert interrupt are
intentionally left out of this initial submission and may be added
later.

Tested on hardware with four MAX40080 devices on an I2C bus.

Patch 1 adds the device-tree binding; patch 2 adds the driver.

Stefan Popa (2):
  dt-bindings: iio: adc: add maxim,max40080
  iio: adc: add MAX40080 current-sense amplifier driver

 .../bindings/iio/adc/maxim,max40080.yaml      |  55 ++
 MAINTAINERS                                   |   9 +
 drivers/iio/adc/Kconfig                       |  11 +
 drivers/iio/adc/Makefile                      |   1 +
 drivers/iio/adc/max40080.c                    | 587 ++++++++++++++++++
 5 files changed, 663 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/maxim,max40080.yaml
 create mode 100644 drivers/iio/adc/max40080.c

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2.51.0