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Subject[PATCH v2 2/4] dt-bindings: add parallax ping sensors
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..a079c9921af6
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/proximity/parallax-ping.yaml
@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
+%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-gpios is raised by the driver to start measurement
+ - 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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