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* ST_LSM6DSx driver for STM 6-axis (acc + gyro) imu Mems sensors

Required properties:
- compatible: must be one of:
  "st,lsm6ds3"
  "st,lsm6dsm"
- reg: i2c address of the sensor / spi cs line

Optional properties:
- st,drdy-int-pin: the pin on the package that will be used to signal
  "data ready" (valid values: 1 or 2).
- interrupt-parent: should be the phandle for the interrupt controller
- interrupts: interrupt mapping for IRQ. It should be configured with
  flags IRQ_TYPE_LEVEL_HIGH or IRQ_TYPE_EDGE_RISING.

  Refer to interrupt-controller/interrupts.txt for generic interrupt
  client node bindings.

Example:

lsm6dsm@6b {
	compatible = "st,lsm6dsm";
	reg = <0x6b>;
	interrupt-parent = <&gpio0>;
	interrupts = <0 IRQ_TYPE_EDGE_RISING>;
};