Add iio driver and DT binding for the Microchip PAC1921 Current/Power monitor. Implemented most of the features with few limitations listed in the driver commit message. Tested with a Pine64 host board connected to a PAC1921 click board [1] via I2C. The PAC1921 click board embeds the Microchip PAC1921 device and a 10 mOhms shunt resistor. The PAC1921 datasheet is at [2]. [1]: https://www.mikroe.com/pac1921-click [2]: https://ww1.microchip.com/downloads/en/DeviceDoc/PAC1921-Data-Sheet-DS20005293E.pdf Signed-off-by: Matteo Martelli <matteomartelli3@xxxxxxxxx> --- Changes in v3: - Add shunt_resistor attribute for current channel - Generalize shunt_resistor ABI - Remove specific pac1921 ABI - Remove resolution and filters controls - Use scale attributes instead of hwgain attributes to control gains - Replace integration_num_samples and integration_time attributes with oversample_ratio and sampling_frequency - Consider time to enter integration mode before marking data available - Add controls for overflow events - Add select fields in Kconfig - Refactoring based on Jonathan feedback from v2 - Link to v2: https://lore.kernel.org/r/20240704-iio-pac1921-v2-0-0deb95a48409@xxxxxxxxx Changes in v2: - DT binding: remove vendor specific gains, add vdd-supply, add read/int gpio and fix properties order in example - Remove parsing of gains from DT - Handle vdd regulator - Fix return value in filter_en write handler - Link to v1: https://lore.kernel.org/r/20240703-iio-pac1921-v1-0-54c47d9180b6@xxxxxxxxx --- Matteo Martelli (3): dt-bindings: iio: adc: add binding for pac1921 iio: ABI: generalize shunt_resistor attribute iio: adc: add support for pac1921 Documentation/ABI/testing/sysfs-bus-iio | 8 + .../ABI/testing/sysfs-bus-iio-adc-max9611 | 17 - Documentation/ABI/testing/sysfs-bus-iio-ina2xx-adc | 9 - .../bindings/iio/adc/microchip,pac1921.yaml | 71 ++ MAINTAINERS | 7 + drivers/iio/adc/Kconfig | 13 + drivers/iio/adc/Makefile | 1 + drivers/iio/adc/pac1921.c | 1265 ++++++++++++++++++++ 8 files changed, 1365 insertions(+), 26 deletions(-) --- base-commit: 1ebab783647a9e3bf357002d5c4ff060c8474a0a change-id: 20240606-iio-pac1921-77fa0fa3ac11 Best regards, -- Matteo Martelli <matteomartelli3@xxxxxxxxx>
