[PATCH v6 0/8] iio: add new backend framework

[Nuno Sa via B4 Relay <devnull+nuno.sa.analog.com@kernel.org>]

v1:
 https://lore.kernel.org/linux-iio/20231204144925.4fe9922f@jic23-huawei/T/#m222f5175273b81dbfe40b7f0daffcdc67d6cb8ff

v2:
 https://lore.kernel.org/r/20231208-dev-iio-backend-v2-0-5450951895e1@analog.com

v3:
 https://lore.kernel.org/linux-iio/20231213-dev-iio-backend-v3-0-bb9f12a5c6dc@analog.com/

v4:
 https://lore.kernel.org/r/20231220-iio-backend-v4-0-998e9148b692@analog.com

v5:
 https://lore.kernel.org/r/20240112-iio-backend-v5-0-bdecad041ab4@analog.com

Changes in v6:
 - Patch 2
  * Add '#io-backends-cells' property to the example dts.
 - Patch 6
  * Improve comment on struct iio_backend_buffer_pair;
  * Be consistent with dots in kernel-docs. So dots only exist now in
    description and return. Also be consistent on device managed APIs
    subject and @dev description;
  * Added devm_iio_backend_enable() and hence (and for now)
    iio_backend_disable is static;
  * Fixed __devm_iio_backend_get_from_fwnode_lookup() kernel-doc;
  * Improved english in devm_iio_backend_register() comment;
  * Don't make private data mandatory;
 - Patch 7
  * Use local ad9467_chip_info *info variable;
  * Improve error handling for optional devm_iio_backend_get();
  * Make use of devm_iio_backend_enable().
 - Patch 8
  * Also change string format in version error path.

Not that big of change in this version (more small things). The most
noticeable is perhaps the introduction of devm_iio_backend_enable().

Keeping the block diagram  so we don't have to follow links
to check one of the typical setups.

                                           -------------------------------------------------------
 ------------------                        | -----------         ------------      -------  FPGA |
 |     ADC        |------------------------| | AXI ADC |---------| DMA CORE |------| RAM |       |
 | (Frontend/IIO) | Serial Data (eg: LVDS) | |(backend)|---------|          |------|     |       |
 |                |------------------------| -----------         ------------      -------       |
 ------------------                        -------------------------------------------------------

---
Nuno Sa (7):
      dt-bindings: adc: ad9467: add new io-backend property
      dt-bindings: adc: axi-adc: update bindings for backend framework
      driver: core: allow modifying device_links flags
      iio: buffer-dmaengine: export buffer alloc and free functions
      iio: add the IIO backend framework
      iio: adc: ad9467: convert to backend framework
      iio: adc: adi-axi-adc: move to backend framework

Olivier Moysan (1):
      of: property: add device link support for io-backends

 .../devicetree/bindings/iio/adc/adi,ad9467.yaml    |   4 +
 .../devicetree/bindings/iio/adc/adi,axi-adc.yaml   |   8 +-
 MAINTAINERS                                        |   8 +
 drivers/base/core.c                                |  14 +-
 drivers/iio/Kconfig                                |   9 +
 drivers/iio/Makefile                               |   1 +
 drivers/iio/adc/Kconfig                            |   4 +-
 drivers/iio/adc/ad9467.c                           | 272 +++++++++-----
 drivers/iio/adc/adi-axi-adc.c                      | 383 +++++--------------
 drivers/iio/buffer/industrialio-buffer-dmaengine.c |   8 +-
 drivers/iio/industrialio-backend.c                 | 412 +++++++++++++++++++++
 drivers/of/property.c                              |   2 +
 include/linux/iio/adc/adi-axi-adc.h                |  68 ----
 include/linux/iio/backend.h                        |  72 ++++
 include/linux/iio/buffer-dmaengine.h               |   3 +
 15 files changed, 806 insertions(+), 462 deletions(-)
---
base-commit: 801590b27bfbdb6721f85e2c3af70e627e52c8d5
change-id: 20231219-iio-backend-a3dc1a6a7a58
--

Thanks!
- Nuno Sá