iio: mma8452: add support for runtime power management
This adds support for runtime power management and, if configured, activates
automatic standby after 2 seconds of inactivity.
Inactivity means no read of acceleration values and no events triggered or
activated.
If CONFIG_PM is not set, this doesn't change anything for existing users.
Signed-off-by: Martin Kepplinger <martink@posteo.de>
Signed-off-by: Christoph Muellner <christoph.muellner@theobroma-systems.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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