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53 lines
1.7 KiB
53 lines
1.7 KiB
# 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 <[email protected]> |
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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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