This series adds support for high-speed, high-precision AD4000 series of SAR ADCs. Most uncommon things about this set are: 1) These devices have the same SPI (Strange Peripheral Interface) as AD7944 devices, which has been documented in ad7944.rst [1]. The device tree description for SPI connections and mode can be the same as of ad7944 adi,spi-mode [2]. Because ad4000 driver does not currently support daisy-chain mode, I simplified things a little bit. If having a more complete doc is preferred, I'm fine changing to that. [1]: https://lore.kernel.org/linux-iio/20240313-mainline-ad7944-doc-v1-2-7860416726e4@xxxxxxxxxxxx/ [2]: https://lore.kernel.org/linux-iio/20240304-ad7944-mainline-v5-1-f0a38cea8901@xxxxxxxxxxxx/ 2) Differently from AD7944, AD4000 devices have a configuration register to toggle some features. For instance, turbo mode is set through configuration register rather than an external pin. This simplifies hardware connections, but then requires software interface. So, additional ABI being proposed in sysfs-bus-iio-adc-ad4000. The one I'm most in doubt about is span_compression_en which affects the in_voltageY_scale attribute. That might be instead supported by providing _scale_available and allowing write to _scale. Anyway, let me know how bad those look like :) Thanks, Marcelo Marcelo Schmitt (2): dt-bindings: iio: adc: Add AD4000 iio: adc: Add support for AD4000 .../ABI/testing/sysfs-bus-iio-adc-ad4000 | 36 + .../bindings/iio/adc/adi,ad4000.yaml | 151 ++++ MAINTAINERS | 9 + drivers/iio/adc/Kconfig | 12 + drivers/iio/adc/Makefile | 1 + drivers/iio/adc/ad4000.c | 666 ++++++++++++++++++ 6 files changed, 875 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-adc-ad4000 create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad4000.yaml create mode 100644 drivers/iio/adc/ad4000.c -- 2.43.0
