iio:magnetometer:ak8975: power regulator support
Add support for an optional regulator which, if found into device-tree, will power on device at probing time. The regulator is declared into ak8975 DTS entry as a "vdd-supply" property. Signed-off-by: NGregor Boirie <gregor.boirie@parrot.com> Signed-off-by: NJonathan Cameron <jic23@kernel.org>
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