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. Change log v3 -> v4 [IIO driver] - No longer changing spi_device CS timing parameters. - SPI offload messages now set only one transfer. - Degraded offload_xfers from array to single entry field. - Adjusted ad4000_spi_offload_setup() comment. - Dropped t_quiet1_ns since it's not used anymore. - Fixed include order. - Fixed typo: withouth -> without. [Documentation] - Picked up review tags. - Made phrase about SPI offload engine more generic. - Complemented SPI offload section with supported wiring configurations. Change log v2 -> v3 - Dropped patch 1 of v2 series and reverted buffer endianness and SPI transfer bits_per_word configurations to the way they were in v1. - Removed dummy transfer in ad4000_prepare_offload_turbo_message(). - Unified offload message preparation. - Removed spi->cs_hold.value to use cs_inactive to set CNV/CS high time. - Adjusted max sample rate for AD7983 and AD7984. - Dropped AD4000_TCONV_NS and made all time related constants a time_spec field. - Removed _offl param from _CHANNELS() macros and added a comment about that. - Commented IIO_BE check in ad4000_prepare_3wire_mode_message(). - Now using predisable to balance with postenable. - Put spi/offload/consumer.h include right after spi/spi.h. - Removed unrelated brackets in info_mask_separate_available assignment - Added blank line after if. 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 - Document why the first buffer sample is invalid when offloading - Added blank line before a 'simple return'. Link to v3: https://lore.kernel.org/linux-iio/cover.1742992305.git.marcelo.schmitt@xxxxxxxxxx/ Link to v2: https://lore.kernel.org/linux-iio/cover.1742394806.git.marcelo.schmitt@xxxxxxxxxx/ Link to v1: https://lore.kernel.org/linux-iio/cover.1741970538.git.marcelo.schmitt@xxxxxxxxxx/ Marcelo Schmitt (4): 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 | 91 ++++++++- drivers/iio/adc/Kconfig | 7 +- drivers/iio/adc/ad4000.c | 382 +++++++++++++++++++++++++++++++---- 3 files changed, 444 insertions(+), 36 deletions(-) base-commit: 9f36acefb2621d980734a5bb7d74e0e24e0af166 prerequisite-patch-id: 3d517eef53a799adba5922815fe684b913e36773 -- 2.47.2
