[PATCH v7 0/7] Add support for AD4000 series of ADCs

[Marcelo Schmitt <marcelo.schmitt@analog.com>]

This patch series extends the SPI bitbang, gpio, and spi-engine controllers to
support configurable MOSI line idle states.
It then introduces the ad4000 driver which uses the MOSI idle configuration to
provide improved support for the AD4000 series of ADCs.
Documentation is added describing the new extension to the SPI protocol.
The currently supported wiring modes for AD4000 devices were documented under
IIO documentation directory.

Change log v6 -> v7:
[Device tree]
No changes to device tree from v6 to v7.
[SPI]
spi.c: Removed blank line added in code not related to MOSI idle feature.
spi: bitbang: Rewrapped commit message.
spi: bitbang: Rebased bitbang patch on top of spi for-next branch.
[IIO]
ad4000: Checked gain-milli read from dt and made it match one of supported gains or fail.
ad4000: Added blank lines to improve code readability.
ad4000: return 0; when known that no errors occurred.

Link to v6: https://lore.kernel.org/linux-iio/cover.1719686465.git.marcelo.schmitt@analog.com/
Link to v5: https://lore.kernel.org/linux-iio/cover.1719351923.git.marcelo.schmitt@analog.com/
Link to v4: https://lore.kernel.org/linux-iio/cover.1718749981.git.marcelo.schmitt@analog.com/
Link to v3: https://lore.kernel.org/linux-iio/cover.1717539384.git.marcelo.schmitt@analog.com/
Link to v2: https://lore.kernel.org/linux-iio/cover.1712585500.git.marcelo.schmitt@analog.com/
Link to v1: https://lore.kernel.org/linux-iio/cover.1711131830.git.marcelo.schmitt@analog.com/


Prerequisite patches to apply this series to IIO testing branch:

c3358a746e078d0f9048732c90fdab4f37c00e0d "spi: bitbang: Convert unsigned to unsigned int"
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git/commit/?id=c3358a746e078d0f9048732c90fdab4f37c00e0d

f261172d39f358dcecce13c310690d3937e0cca6 "spi: bitbang: Use typedef for txrx_*() callbacks"
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git/commit/?id=f261172d39f358dcecce13c310690d3937e0cca6

6ecdb0aa4dca62d236a659426e11e6cf302e8f18 "spi: axi-spi-engine: Add SPI_CS_HIGH support"
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git/commit/?h=for-6.11&id=6ecdb0aa4dca62d236a659426e11e6cf302e8f18


Prerequisite patches to apply the series to SPI for-next brach:

ef60f9ca26d33d0f8e1a709771c61d3e96f64559 "docs: iio: add documentation for adis16480 driver"
https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git/commit/?h=testing&id=ef60f9ca26d33d0f8e1a709771c61d3e96f64559


Thanks,
Marcelo

Marcelo Schmitt (7):
  spi: Enable controllers to extend the SPI protocol with MOSI idle
    configuration
  spi: bitbang: Implement support for MOSI idle state configuration
  spi: spi-gpio: Add support for MOSI idle state configuration
  spi: spi-axi-spi-engine: Add support for MOSI idle configuration
  dt-bindings: iio: adc: Add AD4000
  iio: adc: Add support for AD4000
  Documentation: Add AD4000 documentation

 .../bindings/iio/adc/adi,ad4000.yaml          | 197 +++++
 Documentation/iio/ad4000.rst                  | 131 ++++
 Documentation/iio/index.rst                   |   1 +
 Documentation/spi/spi-summary.rst             |  83 ++
 MAINTAINERS                                   |   9 +
 drivers/iio/adc/Kconfig                       |  12 +
 drivers/iio/adc/Makefile                      |   1 +
 drivers/iio/adc/ad4000.c                      | 722 ++++++++++++++++++
 drivers/spi/spi-axi-spi-engine.c              |  15 +-
 drivers/spi/spi-bitbang.c                     |  24 +
 drivers/spi/spi-gpio.c                        |  12 +-
 drivers/spi/spi.c                             |   6 +
 include/linux/spi/spi_bitbang.h               |   1 +
 include/uapi/linux/spi/spi.h                  |   5 +-
 14 files changed, 1213 insertions(+), 6 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad4000.yaml
 create mode 100644 Documentation/iio/ad4000.rst
 create mode 100644 drivers/iio/adc/ad4000.c


base-commit: 986da024b99a72e64f6bdb3f3f0e52af024b1f50
prerequisite-patch-id: 76a35c35c2af889be2ff20052da02df561b3d71b
prerequisite-patch-id: ce5abb83d4f04e72c69d0df4ded79077065cd649
prerequisite-patch-id: b30f54a92e47dbad33ca7450089c7b19610e9cf2
-- 
2.43.0