[PATCH v2 0/2] iio: adc: ti-ads1298: add ADS1298/ADS1299 driver

[Md Shofiqul Islam <shofiqtest@gmail.com>]

The ADS1299 is an 8-channel, 24-bit SPI ADC from Texas Instruments
designed for EEG and biopotential measurement. It shares the same SPI
interface and register map as the ADS1298 ECG ADC family, differing in
PGA gain range (24x vs 12x) and internal reference voltage (always 2.4V).

This series adds ADS1299 support to the existing ti-ads1298 driver by
extending the channel configuration and adding the compatible string to
the device tree binding.

Changes in v2:
- Remove ads1299-4 and ads1299-6 variants; only ads1299 (8-channel)
  is supported. The -4 and -6 variants have not been tested on hardware
  and their channel-count difference is better handled at runtime via
  the ID register rather than separate compatibles.
- Remove second DT binding example (ads1299 node); one example is
  sufficient per binding documentation guidelines.
- Simplify vref-supply description; remove ADS1298 vs ADS1299 specifics
  that belong in the datasheet rather than the binding.

Md Shofiqul Islam (2):
  dt-bindings: iio: adc: ti,ads1298: add ADS1299 EEG ADC variants
  iio: adc: ti-ads1298: add ADS1299 EEG ADC family support

 .../bindings/iio/adc/ti,ads1298.yaml          | 15 ++--
 drivers/iio/adc/ti-ads1298.c                  | 84 ++++++++++++++-----
 2 files changed, 75 insertions(+), 24 deletions(-)

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2.51.1