This series modernizes and cleans up the ak8975 driver, migrating to
more modern kernel APIs and cleaning up legacy code. Patches 7 through
17 were provided by Andy Shevchenko.

The series was compile-tested and ran in QEMU with i2c-stub and
no issues were found.

Changes include:
 - replacing usleep_range() with fsleep() for optimization
 - migrating to iopoll macros for better device polling
 - removing unused headers and adding new ones
 - checkpatch.pl fixes
 - switching driver to use devm_* functions

Signed-off-by: Joshua Crofts <joshua.crofts1@gmail.com>
---
Changes in v2:
- PATCH 1: reverted alphabetical header ordering per logical change
  separation
- PATCH 2: added newline between fsleep() and return
- PATCH 3: fixed open parenthesis formatting
- PATCH 4: fixed whitespace issues, added <linux/time.h> for
  USEC_PER_MSEC macro

Changes in v3:
- PATCH 1 & 2: split alphabetical ordering and header removal into two
  separate patches
- PATCH 4: commit message fix
- PATCH 5 & 6: split error handling and polling loop replacement into
  two separate patches

Changes in v4:
- PATCH 7-17: am Andy's changes into this series
- PATCH 2, 5, 6: fixup Andy's changes to existing patches

Changes in v5:
- PATCH 6 & 7: reorder patch series, edit commit messages
- PATCH 8: add check for negative val from readx_*() call
- Various cleanups

---

---
Andy Shevchenko (10):
      iio: magnetometer: ak8975: avoid using temporary variable
      iio: magnetometer: ak8975: drop duplicate NULL check
      iio: magnetometer: ak8975: remove duplicate error message
      iio: magnetometer: ak8975: reduce usage of magic lengths of the buffer
      iio: magnetometer: ak8975: unify return code variable name
      iio: magnetometer: ak8975: switch to using managed resources
      iio: magnetometer: ak8975: consistently use 'data' parameter
      iio: magnetometer: ak8975: unify messages with help of dev_err_probe()
      iio: magnetometer: ak8975: use temporary variable for struct device
      iio: magnetometer: ak8975: make use of the macros from bits.h

Joshua Crofts (8):
      iio: magnetometer: ak8975: sort headers alphabetically
      iio: magnetometer: ak8975: update headers per IWYU principle
      iio: magnetometer: ak8975: replace usleep_range() with fsleep()
      iio: magnetometer: ak8975: change 'u8*' to 'u8 *' in cast
      iio: magnetometer: ak8975: fix wrong errno on return
      iio: magnetometer: ak8975: pass conversion timeouts as arguments
      iio: magnetometer: ak8975: modernize polling loops with iopoll() macros
      iio: magnetometer: ak8975: check if gpiod read was successful

 drivers/iio/magnetometer/ak8975.c | 369 +++++++++++++++++++-------------------
 1 file changed, 180 insertions(+), 189 deletions(-)
---
base-commit: 440c14da1af1cc6cc9bb18841603711d845ed900
change-id: 20260505-magnetometer-fixes-d3a96180ab4c

Best regards,
-- 
Joshua Crofts <joshua.crofts1@gmail.com>