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SubjectRe: [PATCH 2/5] dt-bindings: add parallax ping sensors
On Thu, Nov 07, 2019 at 02:00:29PM +0100, Andreas Klinger wrote:
> Add dt-bindings for parallax PING))) and LaserPING iio sensors, which
> are used for measuring distances.
>
> Signed-off-by: Andreas Klinger <ak@it-klinger.de>
> ---
> .../bindings/iio/proximity/parallax-ping.yaml | 51 ++++++++++++++++++++++
> 1 file changed, 51 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/iio/proximity/parallax-ping.yaml
>
> diff --git a/Documentation/devicetree/bindings/iio/proximity/parallax-ping.yaml b/Documentation/devicetree/bindings/iio/proximity/parallax-ping.yaml
> new file mode 100644
> index 000000000000..ab8dbdf4f04a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/proximity/parallax-ping.yaml
> @@ -0,0 +1,51 @@
> +# SPDX-License-Identifier: GPL-2.0-or-later
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/proximity/parallax-ping.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Parallax PING))) and LaserPING range finder
> +
> +maintainers:
> + - Andreas Klinger <ak@it-klinger.de>
> +
> +description: |
> + Bit-banging driver using one GPIO:
> + - ping-gpio is raised by the driver to start measurement

ping-gpios or "Ping GPIO"

> + - direction of ping-gpio is then switched into input with an interrupt
> + for receiving distance value as PWM signal
> +
> + Specifications about the devices can be found at:
> + http://parallax.com/sites/default/files/downloads/28041-LaserPING-2m-Rangefinder-Guide.pdf
> + http://parallax.com/sites/default/files/downloads/28015-PING-Documentation-v1.6.pdf
> +
> +properties:
> + compatible:
> + enum:
> + - parallax,ping
> + - parallax,laserping
> +
> + ping-gpios:
> + description:
> + Definition of the GPIO for the triggering and echo (output and input)
> + This GPIO is set for about 5 us by the driver to tell the device it
> + should initiate the measurement cycle. Afterwards the GPIO is switched
> + to input direction with an interrupt. The device sets it and the
> + length of the input signal corresponds to the measured distance.
> + It needs to be an GPIO which is able to deliver an interrupt because
> + the time between two interrupts is measured in the driver.
> + See Documentation/devicetree/bindings/gpio/gpio.txt for information
> + on how to specify a consumer gpio.
> + maxItems: 1
> +
> +required:
> + - compatible
> + - ping-gpios
> +
> +examples:
> + - |
> + #include <dt-bindings/gpio/gpio.h>
> + proximity {
> + compatible = "parallax,laserping";
> + ping-gpios = <&gpio0 26 GPIO_ACTIVE_HIGH>;
> + };
> --
> 2.11.0

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