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These capabilites typically extend beyond a single operation and are therefore not directly linked to if a single function call is implemented or not. Furthermore, the capabilites determine if a certain set of operations should be attempted, or skipped by the frontend. This way the frontend driver can work with a minimalistic set of features and still have the device in fully functional state. Signed-off-by: Tomas Melin --- Changes in v3: - Reduce set of capabilities to only include calibration. The other ones propsed in V2 can be seen as subset of calibration, or single operation failing with opnotsupported - Rename backends checking function - Relocate caps field inside backend struct (pahole) - Add kernel-docs - Add capabilites for exisiting backend variants - Link to v2: https://lore.kernel.org/r/20260113-b4-ad9467-optional-backend-v2-0-0a27e7e72f41@vaisala.com Changes in v2: - Added industrialio-backend capabilities feature - Removed acceptance for fully optional backend, instead require atleast minimalistic backend to exist - Switched to FIELD_MODIFY() - Fixed kernel test robot reported failure for missing bitfield.h - Link to v1: https://lore.kernel.org/r/20251216-b4-ad9467-optional-backend-v1-0-83e61531ef4d@vaisala.com --- Tomas Melin (4): iio: adc: ad9467: include two's complement in default mode iio: industrialio-backend: support backend capabilities iio: adc: adi-axi-adc: define supported iio-backend capabilities iio: adc: ad9467: check for backend capabilities drivers/iio/adc/ad9467.c | 44 ++++++++++++++++++++++++++++++-------- drivers/iio/adc/adi-axi-adc.c | 2 ++ drivers/iio/industrialio-backend.c | 17 +++++++++++++++ include/linux/iio/backend.h | 17 +++++++++++++++ 4 files changed, 71 insertions(+), 9 deletions(-) --- base-commit: a7b10f0963c651a6406d958a5f64b9c5594f84da change-id: 20251215-b4-ad9467-optional-backend-23f1099ee4d7 Best regards, -- Tomas Melin