This patch series extends the ad4000 driver to support SPI offloading. In addition to that, ad4000 IIO documentation is expanded to: - list PulSAR parts supported by the ad4000 driver. - describe some characteristics of AD4000 IIO device. - describe changes when SPI offload is being used. v2 changes were tested with ADAQ4003 on CoraZ7 setup running Linux built from IIO testing branch. Link to v1: https://lore.kernel.org/linux-iio/cover.1741970538.git.marcelo.schmitt@xxxxxxxxxx/ Change log v1 -> v2 - Fixed passing inappropriate pointer instead of ret to dev_err_probe(). - [new patch] Set transfer bits_per_word to have data in CPU endianness. - Set iio_dev num_channels close to where channels is set. - Complement offload message comment about first sample being invalid. - Documented why the first buffer sample is invalid when offloading. - Added blank line before a 'simple return'. Instead of changing bits_per_word according to buffer endianness, I set bits_per_word for other SPI transfers and updated IIO channels to always use CPU endianness (the new patch). With that, bits_per_word no longer needs be updated according to buffer endianness or, in other words, buffer endianness is no longer related to bits_per_word. Marcelo Schmitt (5): iio: adc: ad400: Set transfer bits_per_word to have data in CPU endianness iio: adc: ad4000: Add support for SPI offload Documentation: iio: ad4000: Add new supported parts Documentation: iio: ad4000: Add IIO Device characteristics section Documentation: iio: ad4000: Describe offload support Documentation/iio/ad4000.rst | 86 +++++- drivers/iio/adc/Kconfig | 7 +- drivers/iio/adc/ad4000.c | 509 +++++++++++++++++++++++++++++------ 3 files changed, 512 insertions(+), 90 deletions(-) base-commit: af94f401e26f686f7391ce79b38a6129417c22dc prerequisite-patch-id: 3d517eef53a799adba5922815fe684b913e36773 -- 2.47.2
