54 lines
1.7 KiB
YAML
54 lines
1.7 KiB
YAML
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# SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/iio/proximity/parallax-ping.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Parallax PING))) and LaserPING range finder
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maintainers:
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- Andreas Klinger <ak@it-klinger.de>
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description: |
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Bit-banging driver using one GPIO:
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- ping-gpios is raised by the driver to start measurement
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- direction of ping-gpio is then switched into input with an interrupt
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for receiving distance value as PWM signal
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Specifications about the devices can be found at:
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http://parallax.com/sites/default/files/downloads/28041-LaserPING-2m-Rangefinder-Guide.pdf
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http://parallax.com/sites/default/files/downloads/28015-PING-Documentation-v1.6.pdf
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properties:
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compatible:
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enum:
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- parallax,ping
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- parallax,laserping
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ping-gpios:
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description:
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Definition of the GPIO for the triggering and echo (output and input)
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This GPIO is set for about 5 us by the driver to tell the device it
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should initiate the measurement cycle. Afterwards the GPIO is switched
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to input direction with an interrupt. The device sets it and the
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length of the input signal corresponds to the measured distance.
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It needs to be an GPIO which is able to deliver an interrupt because
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the time between two interrupts is measured in the driver.
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See Documentation/devicetree/bindings/gpio/gpio.txt for information
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on how to specify a consumer gpio.
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maxItems: 1
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required:
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- compatible
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- ping-gpios
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/gpio/gpio.h>
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proximity {
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compatible = "parallax,laserping";
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ping-gpios = <&gpio0 26 GPIO_ACTIVE_HIGH>;
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};
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