[PATCH v4 00/17] iio: resolver: move ad2s1210 out of staging

[David Lechner <dlechner@baylibre.com>]

This series is working towards moving the ad2s1210 resolver driver out of
staging (after 13 years!). It involves a bunch of fixes and improvements
to make proper device tree bindings and use standard IIO sysfs attributes.

This series has been tested on actual hardware using a EVAL-AD2S1210 evaluation
board. (Note: not all device tree features have been implemented in the driver
since the eval board doesn't support them out of the box. We plan to add them
later if needed.)

---

v4 changes:
* Dropped applied patches:
  * "dt-bindings: iio: resolver: add devicetree bindings for ad2s1210"
  * "staging: iio: resolver: ad2s1210: read excitation frequency from
    control register"
  * "staging: iio: resolver: ad2s1210: refactor setting excitation
    frequency"
  * "staging: iio: resolver: ad2s1210: rework gpios"
  * "staging: iio: resolver: ad2s1210: remove config attribute"
  * "staging: iio: resolver: ad2s1210: add debugfs reg access"
  * "staging: iio: resolver: ad2s1210: use regmap for config registers"
  * "staging: iio: resolver: ad2s1210: use devicetree to get CLKIN rate"
  * "staging: iio: resolver: ad2s1210: implement IIO_CHAN_INFO_SCALE"
  * "staging: iio: resolver: ad2s1210: always use 16-bit value for raw
    read"
  * "staging: iio: resolver: ad2s1210: sort imports"
  * "staging: iio: resolver: ad2s1210: remove spi_set_drvdata()"
  * "staging: iio: resolver: ad2s1210: check return of ad2s1210_initial()"
  * "staging: iio: resolver: ad2s1210: remove call to spi_setup()"
  * "staging: iio: resolver: ad2s1210: fix use before initialization"
* Added new patches:
  * "staging: iio: resolver: ad2s1210: do not use fault register for
    dummy read"
  * "iio: event: add optional event label support"
  * "staging: iio: resolver: ad2s1210: add register/fault support summary"
  * "staging: iio: resolver: ad2s1210: remove fault attribute"
  * "staging: iio: resolver: ad2s1210: simplify code with guard(mutex)"
* Fixed DT property name in commit description of "staging: iio:
  resolver: ad2s1210: convert resolution to devicetree property"
* Fixed compile error in "staging: iio: resolver: ad2s1210: implement
  fault events".
* Fixed angl0 hysteresis raw values when assigned-resolution-bits != 16.
* Fixed missing word in "staging: iio: resolver: ad2s1210: convert DOS
  overrange threshold to event attr" commit description.
* Fixed missing static qualifier on event attribute definitions.
* Dropped used of X/Y modifiers on sine/cosine channels.
* Changed type/direction on some events.
* Added event *_label attributes.

Link to v3: https://lore.kernel.org/r/20230929-ad2s1210-mainline-v3-0-fa4364281745@baylibre.com

v3 changes:
* Dropped applied patches:
  * "staging: iio: resolver: ad2s1210: fix ad2s1210_show_fault"
  * "iio: adc: MCP3564: fix the static checker warning"
* Dropped "staging: iio: Documentation: document IIO resolver AD2S1210
  sysfs attributes". We will attempt to use existing ABI for faults/
  thresholds in a future series.
* Added description of A0/A1 lines in DT bindings.
* Added power supply regulators to DT bindings.
* Moved sorting imports to separate patch.
* Renamed fclkin to clkin_hz.
* Added __be16 sample field to state struct for reading raw samples.
* Split out new function ad2s1210_single_conversion() from
  ad2s1210_read_raw().
* Split out new ad2s1210_get_hysteresis() and ad2s1210_set_hysteresis()
  functions.
* Fixed multi-line comment style.
* Added notes about soft reset not resetting config registers.
* Made use of FIELD_PREP() macro.
* Added more explanation to regmap commit message.
* Removed datasheet names from channel specs.
* Replaced "staging: iio: resolver: ad2s1210: rename fexcit attribute"
  with "staging: iio: resolver: ad2s1210: convert fexcit to channel
  attribute".
* Replaced "staging: iio: resolver: ad2s1210: add phase_lock_range
  attributes" with "staging: iio: resolver: ad2s1210: add phase lock
  range support"
* Added additional patches to convert custom device attributes to event
  attributes.
* Added patch for to add label attributes.

Link to v2: https://lore.kernel.org/r/20230921144400.62380-1-dlechner@baylibre.com

v2 changes:
* Address initial device tree patch feedback
* Drop "iio: sysfs: add IIO_DEVICE_ATTR_NAMED_RW macro" (related cleanups
  also dropped for now, will address in a future series if needed)
* Apply improvements as a series of patches to the staging driver. It is
  not quite ready for the move out of staging patch yet.

---
David Lechner (17):
      staging: iio: resolver: ad2s1210: do not use fault register for dummy read
      staging: iio: resolver: ad2s1210: implement hysteresis as channel attr
      staging: iio: resolver: ad2s1210: convert fexcit to channel attribute
      staging: iio: resolver: ad2s1210: convert resolution to devicetree property
      staging: iio: resolver: ad2s1210: add phase lock range support
      staging: iio: resolver: ad2s1210: add triggered buffer support
      staging: iio: resolver: ad2s1210: convert LOT threshold attrs to event attrs
      staging: iio: resolver: ad2s1210: convert LOS threshold to event attr
      staging: iio: resolver: ad2s1210: convert DOS overrange threshold to event attr
      staging: iio: resolver: ad2s1210: convert DOS mismatch threshold to event attr
      staging: iio: resolver: ad2s1210: rename DOS reset min/max attrs
      iio: event: add optional event label support
      staging: iio: resolver: ad2s1210: implement fault events
      staging: iio: resolver: ad2s1210: add register/fault support summary
      staging: iio: resolver: ad2s1210: add label attribute support
      staging: iio: resolver: ad2s1210: remove fault attribute
      staging: iio: resolver: ad2s1210: simplify code with guard(mutex)

 Documentation/ABI/testing/sysfs-bus-iio            |   15 +
 drivers/iio/industrialio-event.c                   |   55 +
 .../Documentation/sysfs-bus-iio-resolver-ad2s1210  |   27 +
 drivers/staging/iio/resolver/ad2s1210.c            | 1194 ++++++++++++++++----
 include/linux/iio/iio.h                            |    8 +
 5 files changed, 1061 insertions(+), 238 deletions(-)
---
base-commit: 2d3dff577dd0ea8fe9637a13822f7603c4a881c8
change-id: 20230925-ad2s1210-mainline-2791ef75e386