This is v2 of cleanup and freefall detection for mma8452 devices.
[PATCH 1/3] iio: mma8452: remove unused register description
[PATCH 2/3] iio: mma8452: use enum for channel index
[PATCH 3/3] iio: mma8452: add freefall detection for Freescale's
If freefall mode (x&y&z falling event) is enabled, changes to individual
(rising) axis events have no effect, keeping the state consistent to
what values the user reads.
Other combinations (x&y, y&z, x&z) could be added later. x&y&z is
by far the most useful one for freefall detection.
Of course this doesn't change anything for existing users.
revision history
----------------
v2: freefall channel idx -1, seperate enum patch, cleanup and fixes
thanks to Jonathan's review.
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