Hey Jonathan,

I think we need the naming to explicitly mention north_magnetic instead
of just north.  Whilst it is obvious what north means when you have north
true alongside it, it won't be so obvious if one just has the north
attribute
to see in a particular driver - if anything I'd have the true as the one
that was simply called north (as it might not be coming from a magnetometer
thought obviously that's the most common source)   I'd also rather the enum
entries
were
IIO_MOD_NORTH_MAGN
IIO_MOD_NORTH_TRUE
IIO_MOD_NORTH_MAGN_TILT_COMP
IIO_MOD_NORTH_TRUE_TILT_COMP

It is definitely feasible that they will not come from magnetometers -
a differential bearing is common on GPS units.

Makes sense to me. I will update the patches with your suggestions. Thanks.