[PATCH v2 0/2] iio: orientation: hid-sensor-rotation: fix quaternion alignment

[David Lechner <dlechner@baylibre.com>]

The main point of this series is to fix a regression reported in
hid-sensor-rotation where the alignment of the quaternion field in the
data was inadvertently changed from 16 bytes to 8 bytes. This is an
unusually case (one of only 2 in the kernel) where the .repeat field of
struct iio_scan_type is used and we have such a requirement. (The other
case uses u16 instead of u32, so it wasn't affected.)

To make the reason for the alignment more explicit to future readers,
we introduce a new macro, IIO_DECLARE_QUATERNION(), to declare the
array with proper alignment. This is meant to follow the pattern of
the similar IIO_DECLARE_BUFFER_WITH_TS() macro.

Signed-off-by: David Lechner <dlechner@baylibre.com>
---
Changes in v2:
- Rename IIO_DECLARE_REPEATED_ELEMENT() to IIO_DECLARE_QUATERNION().
- Link to v1: https://lore.kernel.org/r/20260214-iio-fix-repeat-alignment-v1-0-47f01288c803@baylibre.com

---
David Lechner (2):
      iio: add IIO_DECLARE_QUATERNION() macro
      iio: orientation: hid-sensor-rotation: fix quaternion alignment

 drivers/iio/orientation/hid-sensor-rotation.c |  2 +-
 include/linux/iio/iio.h                       | 12 ++++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)
---
base-commit: 3fa5e5702a82d259897bd7e209469bc06368bf31
change-id: 20260214-iio-fix-repeat-alignment-575b2c009e25

Best regards,
-- 
David Lechner <dlechner@baylibre.com>