[0/2] Support for TI ADS7128 and ADS7138 ADCs

Message

Tobias Sperling via B4 Relay Nov. 22, 2024, 3:15 p.m. UTC

This patch series adds support for Texas Instruments ADS7128 and
ADS7138, which are 12-bit, 8 channel analog-to-digital converters (ADCs)
with build-in digital window comparator (DWC), using the I2C interface.

The driver exposes the interfaces to read the raw values, as well as the
minimum and maximum value for each channel. In addition several settings
can be configured, like the DWC, sampling frequency or an averaging
filter/oversampling. Interrupts triggered by the DWC, if configured, are
then exposed as IIO events.

ADS7128 differs in the addition of further hardware features, like a
root-mean-square (RMS) and a zero-crossing-detect (ZCD) module, which
are not yet supported by the driver.

Regarding the I2C interface the chips using opcodes to define the way
how the registeres are accessed, like single or multiple register(s)
read/write or setting/clearing only bits. 

Changes in v1:
- dt-bindings: Extended description

Signed-off-by: Tobias Sperling <[e-mail]>
---
Tobias Sperling (2):
      dt-bindings: iio: adc: Introduce ADS7138
      iio: adc: Add driver for ADS7128 / ADS7138

 .../devicetree/bindings/iio/adc/ti,ads7138.yaml    |  64 ++
 drivers/iio/adc/Kconfig                            |  10 +
 drivers/iio/adc/Makefile                           |   1 +
 drivers/iio/adc/ti-ads7138.c                       | 796 +++++++++++++++++++++
 4 files changed, 871 insertions(+)
---
base-commit: 2d5404caa8c7bb5c4e0435f94b28834ae5456623
change-id: 20241122-adc_ml-d1ce86e85b2c

Best regards,