The accelerometers supported by mma8452 can use significantly less power if configured accordingly. Let's make use of this:
* add support for runtime power management (disabling the device after 2 seconds of inactivity), and * add a "power_modes" property to IIO sysfs, that offers a "low_power" *active* mode of operation that roughly consumes half the power of the default mode. If you don't have CONFIG_PM enabled, by default nothing changes for you. Here's how it's done and tested on MMA8653FC: [PATCH 1/4] iio: mma8452: coding style fixes [PATCH 2/4] iio: mma8452: avoid switching to active because of config [PATCH 3/4] iio: mma8452: add support for runtime power management [PATCH 4/4] iio: mma8452: add low_power mode
