The AD7606C-16 and AD7606C-18 are pretty similar with the AD7606B. The main difference between AD7606C-16 & AD7606C-18 is the precision in bits (16 vs 18). Because of that, some scales need to be defined for the 18-bit variants, as they need to be computed against 2**18 (vs 2**16 for the 16 bit-variants). Because the AD7606C-16,18 also supports bipolar & differential channels, for SW-mode, the default range of 10 V or ±10V should be set at probe. On reset, the default range (in the registers) is set to value 0x3 which corresponds to '±10 V single-ended range', regardless of bipolar or differential configuration. Aside from the scale/ranges, the AD7606C-16 is similar to the AD7606B. This changeset, does a bit of rework to the existing ad7606 driver and then adds support for the AD7606C-16 & AD7606C-18 parts. Datasheet links: https://www.analog.com/media/en/technical-documentation/data-sheets/ad7606c-16.pdf https://www.analog.com/media/en/technical-documentation/data-sheets/ad7606c-18.pdf Changelog v1 -> v2: - v1: https://lore.kernel.org/linux-iio/20240819064721.91494-1-aardelean@xxxxxxxxxxxx/ - Fixed description in 'iio: adc: ad7606: add 'bits' parameter to channels macros' - Added patch 'dt-bindings: iio: adc: document diff-channels corner case for some ADCs' - diff-channels = <reg reg> can be used to define differential channels with dedicated positive + negative pins - Re-worked patch 'dt-bindings: iio: adc: add adi,ad7606c-{16,18} compatible strings' - Using standard 'diff-channels' & 'bipolar' properties from adc.yaml - Re-worked patch 'iio: adc: ad7606: add support for AD7606C-{16,18} parts' - Reading 18-bit samples now relies on SPI controllers being able to pad 18-bits to 32-bits. - Implemented 'diff-channels = <reg reg>' setting - Removed some bad/left-over channel configuration code which I forgot during development and rebasing. Alexandru Ardelean (8): iio: adc: ad7606: add 'bits' parameter to channels macros iio: adc: ad7606: move 'val' pointer to ad7606_scan_direct() iio: adc: ad7606: split a 'ad7606_sw_mode_setup()' from probe iio: adc: ad7606: wrap channel ranges & scales into struct iio: adc: ad7606: rework available attributes for SW channels dt-bindings: iio: adc: document diff-channels corner case for some ADCs dt-bindings: iio: adc: add adi,ad7606c-{16,18} compatible strings iio: adc: ad7606: add support for AD7606C-{16,18} parts .../devicetree/bindings/iio/adc/adc.yaml | 4 + .../bindings/iio/adc/adi,ad7606.yaml | 63 +++ drivers/iio/adc/ad7606.c | 430 +++++++++++++++--- drivers/iio/adc/ad7606.h | 78 +++- drivers/iio/adc/ad7606_spi.c | 71 ++- 5 files changed, 550 insertions(+), 96 deletions(-) -- 2.46.0
