[PATCH v3 0/3] iio: amplifiers: add support for ADL8113 Low Noise Amplifier

[Antoniu Miclaus <antoniu.miclaus@analog.com>]

This patch series adds support for the Analog Devices ADL8113, a 10MHz to 12GHz
Low Noise Amplifier with integrated bypass switches.

The ADL8113 provides four operation modes controlled by two GPIO pins:
- Internal Amplifier (14dB gain)
- Internal Bypass (0dB gain)
- External Bypass A (0dB gain) - Signal routes from RFIN to OUT_A and from IN_A to RFOUT
- External Bypass B (0dB gain) - Signal routes from RFIN to OUT_B and from IN_B to RFOUT

The external bypass modes enable external signal processing, conditioning, or filtering
while maintaining signal integrity through dedicated signal paths.

Changes in v3:
- Refactor driver architecture to separate gain mode and signal path controls
- Replace single "mode" attribute with separate "signal_path" and "hardwaregain" attributes
- Add write support for hardwaregain to enable switching between amplifier (14dB) and bypass (0dB) modes
- Automatically handle signal path constraints (external paths force bypass mode)
- Simplify device tree bindings by removing extra blank line
- Update ABI documentation to reflect the new signal_path attribute interface
- Add comprehensive validation for gain/path combinations

Antoniu Miclaus (3):
  dt-bindings: iio: amplifiers: add adl8113
  iio: amplifiers: adl8113: add driver support
  Documentation: ABI: adl8113: add documentation

 .../testing/sysfs-bus-iio-amplifiers-adl8113  |  30 +++
 .../bindings/iio/amplifiers/adi,adl8113.yaml  |  64 +++++
 drivers/iio/amplifiers/Kconfig                |  12 +
 drivers/iio/amplifiers/Makefile               |   1 +
 drivers/iio/amplifiers/adl8113.c              | 252 ++++++++++++++++++
 5 files changed, 359 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-amplifiers-adl8113
 create mode 100644 Documentation/devicetree/bindings/iio/amplifiers/adi,adl8113.yaml
 create mode 100644 drivers/iio/amplifiers/adl8113.c

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2.43.0