iio: gyro: bmg160: Add rudimentary regulator support
BMG160 needs VDD and VDDIO regulators that might need to be explicitly enabled. Add some rudimentary support to obtain and enable these regulators during probe() and disable them using a devm action. Signed-off-by: Stephan Gerhold <stephan@gerhold.net> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20201211183815.51269-2-stephan@gerhold.netSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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