* NVIDIA Tegra SPE/AON sensor hub with communication via the "IVC" IPC protocol.

The AON FW implements the sensor hub functionality and communicates with the
AP via the "IVC" protocol. The kernel driver that communicates with AON fw on
the sensor hub IVC channel uses the Nvidia Sensor (NVS) framework.
See the nvs.txt documentation for NVS DT capabilities.

== AON Sensor Hub top-level node ==

The AON Senor Hub is represented by the top-level node.

Required properties:
- compatible: Should be "nvidia,tegra186_aon_shub" for T18x.
- mboxes: Should have the respective mbox index to indicate the ivc channel id.
  Formatted as per standard rules for this property.

== AON Sensor Hub sub nodes ==

Each sub-node respresents sensor chip supported by the AON.
Required properties:
- i2c_info: I2C parameters namely controller id, clock rate and chips i2c
	    address on the bus. This property is defined as a u32 tuple
	    of the following form:
	    i2c_info = <0 100000 0x68>;
	    The tuple is described as follows:
	    < I2C_controller_ID I2C_Clock_Rate I2C_address_of_slave >
- chip_id:  Chip id of the sensor chip on the AON sensor hub.
- gpio:	    GPIO number of the GPIO connected to the sensor chip.

Optional Properties:
- aux_chip: Property holds the slave chip id and I2C addr parameters.
- aux_chip_name: Property holds the slave chip name.
- status: set to "ok" or "okay" for normal operation.  Set to anything else
	  to unload the driver without ever communicating with the device.
  Note: The "anything else" above is typically "disabled".
- sensorname_disable: Setting this property to <1> will disable the sensor.
- sensorname_matrix:  Orientation matrix for this device. Where sensorname is
		      substituted by the actual sensor name.
- sensorname_delay_us_min: Change the max supported sampling rate.
- sensorname_delay_us_max: Change the min supported sampling rate.

Possible example:

aon_shub {
	status = "okay";
	compatible = "nvidia,tegra186_aon_shub";
	mboxes = <&aon 5>;

	icm20628@68 {
		i2c_info = <1 100000 0x68>;
		chip_id = <1>;
		gpio = <TEGRA_AON_GPIO(V, 4)>;
		accelerometer_matrix = [00 01 00 01 00 00 00 00 ff];
		gyroscope_matrix = [00 01 00 01 00 00 00 00 ff];
	};

	ak8963c@0c {
		i2c_info = <1 100000 0x0c>;
		chip_id = <2>;
		gpio = <TEGRA_AON_GPIO(V, 5)>;
		magnetic_field_matrix = [00 01 00 01 00 00 00 00 ff];
	};
};