Second round of IIO cleanups for the 3.10 cycle 1) A nice little removal of the unwanted private pointer from struct iio_trigger. 2) Some clean up of the ad799x driver. 3) Couple of cleanups for the exynos_adc driver and some documentation. 4) Move the mxs-lradc initialization a little earlier in the driver to avoid wiping out the configuration just after setting it. A nice small set of worthy bits and bobs.