64 lines
2.3 KiB
Plaintext
64 lines
2.3 KiB
Plaintext
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* NVIDIA Tegra SPE/AON sensor hub with communication via the "IVC" IPC protocol.
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The AON FW implements the sensor hub functionality and communicates with the
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AP via the "IVC" protocol. The kernel driver that communicates with AON fw on
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the sensor hub IVC channel uses the Nvidia Sensor (NVS) framework.
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See the nvs.txt documentation for NVS DT capabilities.
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== AON Sensor Hub top-level node ==
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The AON Senor Hub is represented by the top-level node.
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Required properties:
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- compatible: Should be "nvidia,tegra186_aon_shub" for T18x.
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- mboxes: Should have the respective mbox index to indicate the ivc channel id.
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Formatted as per standard rules for this property.
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== AON Sensor Hub sub nodes ==
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Each sub-node respresents sensor chip supported by the AON.
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Required properties:
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- i2c_info: I2C parameters namely controller id, clock rate and chips i2c
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address on the bus. This property is defined as a u32 tuple
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of the following form:
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i2c_info = <0 100000 0x68>;
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The tuple is described as follows:
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< I2C_controller_ID I2C_Clock_Rate I2C_address_of_slave >
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- chip_id: Chip id of the sensor chip on the AON sensor hub.
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- gpio: GPIO number of the GPIO connected to the sensor chip.
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Optional Properties:
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- aux_chip: Property holds the slave chip id and I2C addr parameters.
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- aux_chip_name: Property holds the slave chip name.
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- status: set to "ok" or "okay" for normal operation. Set to anything else
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to unload the driver without ever communicating with the device.
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Note: The "anything else" above is typically "disabled".
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- sensorname_disable: Setting this property to <1> will disable the sensor.
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- sensorname_matrix: Orientation matrix for this device. Where sensorname is
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substituted by the actual sensor name.
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- sensorname_delay_us_min: Change the max supported sampling rate.
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- sensorname_delay_us_max: Change the min supported sampling rate.
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Possible example:
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aon_shub {
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status = "okay";
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compatible = "nvidia,tegra186_aon_shub";
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mboxes = <&aon 5>;
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icm20628@68 {
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i2c_info = <1 100000 0x68>;
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chip_id = <1>;
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gpio = <TEGRA_AON_GPIO(V, 4)>;
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accelerometer_matrix = [00 01 00 01 00 00 00 00 ff];
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gyroscope_matrix = [00 01 00 01 00 00 00 00 ff];
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};
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ak8963c@0c {
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i2c_info = <1 100000 0x0c>;
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chip_id = <2>;
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gpio = <TEGRA_AON_GPIO(V, 5)>;
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magnetic_field_matrix = [00 01 00 01 00 00 00 00 ff];
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};
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};
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