devantech-srf04.yaml

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    1 # SPDX-License-Identifier: GPL-2.0
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/iio/proximity/devantech-srf04.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: Devantech SRF04 and Maxbotix mb1000 ultrasonic range finder
    8 
    9 maintainers:
   10   - Andreas Klinger <ak@it-klinger.de>
   11 
   12 description: |
   13   Bit-banging driver using two GPIOs:
   14   - trigger-gpio is raised by the driver to start sending out an ultrasonic
   15     burst
   16   - echo-gpio is held high by the sensor after sending ultrasonic burst
   17     until it is received once again
   18 
   19   Specifications about the devices can be found at:
   20   https://www.robot-electronics.co.uk/htm/srf04tech.htm
   21 
   22   https://www.maxbotix.com/documents/LV-MaxSonar-EZ_Datasheet.pdf
   23 
   24 properties:
   25   compatible:
   26     enum:
   27       - devantech,srf04
   28       - maxbotix,mb1000
   29       - maxbotix,mb1010
   30       - maxbotix,mb1020
   31       - maxbotix,mb1030
   32       - maxbotix,mb1040
   33 
   34   trig-gpios:
   35     description:
   36       Definition of the GPIO for the triggering (output)
   37       This GPIO is set for about 10 us by the driver to tell the device it
   38       should initiate the measurement cycle.
   39       See Documentation/devicetree/bindings/gpio/gpio.txt for information
   40       on how to specify a consumer gpio.
   41     maxItems: 1
   42 
   43   echo-gpios:
   44     description:
   45       Definition of the GPIO for the echo (input)
   46       This GPIO is set by the device as soon as an ultrasonic burst is sent
   47       out and reset when the first echo is received.
   48       Thus this GPIO is set while the ultrasonic waves are doing one round
   49       trip.
   50       It needs to be an GPIO which is able to deliver an interrupt because
   51       the time between two interrupts is measured in the driver.
   52     maxItems: 1
   53 
   54   power-gpios:
   55     description:
   56       Definition of the GPIO for power management of connected peripheral
   57       (output).
   58       This GPIO can be used by the external hardware for power management.
   59       When the device gets suspended it's switched off and when it resumes
   60       it's switched on again. After some period of inactivity the driver
   61       get suspended automatically (autosuspend feature).
   62     maxItems: 1
   63 
   64   startup-time-ms:
   65     description:
   66       This is the startup time the device needs after a resume to be up and
   67       running.
   68     minimum: 0
   69     maximum: 1000
   70     default: 100
   71 
   72 required:
   73   - compatible
   74   - trig-gpios
   75   - echo-gpios
   76 
   77 additionalProperties: false
   78 
   79 examples:
   80   - |
   81     #include <dt-bindings/gpio/gpio.h>
   82     proximity {
   83         compatible = "devantech,srf04";
   84         trig-gpios = <&gpio1 15 GPIO_ACTIVE_HIGH>;
   85         echo-gpios = <&gpio2  6 GPIO_ACTIVE_HIGH>;
   86     };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/iio/proximity/devantech-srf04.yaml

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sys/contrib/device-tree/Bindings/iio/proximity/devantech-srf04.yaml