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authorSascha Hauer <s.hauer@pengutronix.de>2017-06-06 08:07:28 +0200
committerSascha Hauer <s.hauer@pengutronix.de>2017-06-06 08:07:28 +0200
commitbb2de9a333d17bb1b048ad208002501226b83f03 (patch)
tree8ef2e876ba43af235c45cb2280885e9c67ba5548 /dts/Bindings/iio/proximity
parent79e6629b02fb3a296b5dc70f16dec0f8d415ccf8 (diff)
downloadbarebox-bb2de9a333d17bb1b048ad208002501226b83f03.tar.gz
barebox-bb2de9a333d17bb1b048ad208002501226b83f03.tar.xz
dts: update to v4.12-rc1
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'dts/Bindings/iio/proximity')
-rw-r--r--dts/Bindings/iio/proximity/devantech-srf04.txt28
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diff --git a/dts/Bindings/iio/proximity/devantech-srf04.txt b/dts/Bindings/iio/proximity/devantech-srf04.txt
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+++ b/dts/Bindings/iio/proximity/devantech-srf04.txt
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+* Devantech SRF04 ultrasonic range finder
+ Bit-banging driver using two GPIOs
+
+Required properties:
+ - compatible: Should be "devantech,srf04"
+
+ - trig-gpios: Definition of the GPIO for the triggering (output)
+ This GPIO is set for about 10 us by the driver to tell the
+ device it should initiate the measurement cycle.
+
+ - echo-gpios: Definition of the GPIO for the echo (input)
+ This GPIO is set by the device as soon as an ultrasonic
+ burst is sent out and reset when the first echo is
+ received.
+ Thus this GPIO is set while the ultrasonic waves are doing
+ one round trip.
+ 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.
+
+Example:
+srf04@0 {
+ compatible = "devantech,srf04";
+ trig-gpios = <&gpio1 15 GPIO_ACTIVE_HIGH>;
+ echo-gpios = <&gpio2 6 GPIO_ACTIVE_HIGH>;
+};