aosong,dht
Vendor: Guangzhou Aosong Electronic Co., Ltd.
Note
An implementation of a driver matching this compatible is available in drivers/sensor/aosong/dht/dht.c.
Description
Aosong DHT (Digital-output Humidity and Temperature Sensor)
The Aosong DHT family of sensors provide temperature and humidity
measurements through a bidirectional serial digital signal. The
DHT11 uses a polymer humidity capacitor with NTC thermistor; the
DHT22 replaces the thermistor with a DS18B20 1-wire thermometer.
The DHT22 is also known as an AM2303.
Properties
Properties not inherited from the base binding file.
Name |
Type |
Details |
|---|---|---|
|
|
Pin on which sensor communication will be performed.
Control and data are encoded by the duration of active low
signals. A pull up may be appropriate.
This property is required. |
|
|
Set to identify sensor as a DHT22/AM2303. Leave unset to identify
sensor as a DHT11.
|
|
|
Human readable string describing the sensor. It can be used to
distinguish multiple instances of the same model (e.g., lid accelerometer
vs. base accelerometer in a laptop) to a host operating system.
This property is defined in the Generic Sensor Property Usages of the HID
Usage Tables specification
(https://usb.org/sites/default/files/hut1_3_0.pdf, section 22.5).
|
Deprecated properties not inherited from the base binding file.
(None)
Properties inherited from the base binding file, which defines common properties that may be set on many nodes. Not all of these may apply to the “aosong,dht” compatible.
Name |
Type |
Details |
|---|---|---|
|
|
indicates the operational status of a device
Legal values: See Important properties for more information. |
|
|
compatible strings
This property is required. See Important properties for more information. |
|
|
register space
See Important properties for more information. |
|
|
name of each register space
|
|
|
interrupts for device
See Important properties for more information. |
|
|
extended interrupt specifier for device
|
|
|
name of each interrupt
|
|
|
phandle to interrupt controller node
|
|
|
Human readable string describing the device (used as device_get_binding() argument)
See Important properties for more information. This property is deprecated. |
|
|
Clock gate information
|
|
|
name of each clock
|
|
|
number of address cells in reg property
|
|
|
number of size cells in reg property
|
|
|
DMA channels specifiers
|
|
|
Provided names of DMA channel specifiers
|
|
|
IO channels specifiers
|
|
|
Provided names of IO channel specifiers
|
|
|
mailbox / IPM channels specifiers
|
|
|
Provided names of mailbox / IPM channel specifiers
|
|
|
Power domain specifiers
|
|
|
Provided names of power domain specifiers
|
|
|
Number of cells in power-domains property
|
|
|
Do not initialize device automatically on boot. Device should be manually
initialized using device_init().
|
|
|
Property to identify that a device can be used as wake up source.
When this property is provided a specific flag is set into the
device that tells the system that the device is capable of
wake up the system.
Wake up capable devices are disabled (interruptions will not wake up
the system) by default but they can be enabled at runtime if necessary.
|
|
|
Automatically configure the device for runtime power management after the
init function runs.
|
|
|
List of power states that will disable this device power.
|