60 lines
2.7 KiB
Plaintext
60 lines
2.7 KiB
Plaintext
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* Bosch BMP 180/280 pressure sensor
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nvi_ (NVI = NVidia/Invensense) drivers use the NVidia Sensor (NVS) framework.
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See the nvs.txt documentation for NVS DT capabilities.
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The nvi_bmpX80 pressure sensor driver supports the BMP180 and BMP280 devices
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as stand-alone or behind an Invensense MPU.
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If the part is known and is populated, then it can be specified in the DT:
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Example: bmp280@77.
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By specifying a device this way, the driver will assume this specific device
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is populated during system boot and will not verify its existence. If, however,
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the device is unknown or may not be populated, then the label, ak89xx,
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(e.g. bmpX80@77), must be used. This tells the driver to find which device is
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used. If the device is not found, the driver will unload itself. This also
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requires that regulators be setup correctly for the probe function.
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Required properties:
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- compatible: Device or generic name.
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Supported names:
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- bmp,bmpX80
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- bmp,bmp180
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- bmp,bmp280
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Note: If the part is known and is populated, then it can be specified:
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Example: compatible = "bmp,bmp280";
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When specifying a device this way, the driver will assume this specific
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device is populated during system boot and will not verify its
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existence. If, however, the device is unknown or may not be populated,
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then the label, bmpX80, (Example: compatible = "bmp,bmpX80";),
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must be used. This tells the driver to find which device is used. If
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the device is not found, the driver will unload itself. This requires
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regulators to be setup correctly for the probe function.
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- reg: i2c address of the device. It should be 0x76 or 0x77.
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Optional properties:
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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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Since the driver will unload without communicating with the device, the
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device will be left in its POR state.
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- pressure_disable: Setting this property to <1> will disable the device and
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unload the driver.
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- vdd-supply: regulator supply for the chip
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- vddio-supply: regulator supply for the chip
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Note: These are required if the driver is to control the regulators.
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- nvi_config: This configures the device's I2C connection.
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The string options are: auto
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mpu
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host
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auto = the driver will auto detect the connection.
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mpu = the device is connected to an Invensense auxilary bus.
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host = the device is connected to the host AP.
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If this property is not defined, auto will be used.
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Example:
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bmpX80@77 {
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compatible = "bmp,bmpX80";
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reg = <0x77>;
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};
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