From: Andreas Klinger <ak@it-klinger.de>
To: jic23@kernel.org, knaack.h@gmx.de, lars@metafoo.de,
pmeerw@pmeerw.net, gregkh@linuxfoundation.org,
dledford@redhat.com, akpm@linux-foundation.org,
shraddha.6596@gmail.com, w@1wt.eu, balbi@kernel.org,
mtk.manpages@gmail.com, sjenning@redhat.com,
ksenija.stanojevic@gmail.com, vilhelm.gray@gmail.com,
robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com,
ijc+devicetree@hellion.org.uk, galak@codeaurora.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-iio@vger.kernel.org
Cc: ak@it-klinger.de
Subject: [PATCH v2 1/2] iio: distance: add dt binding for devantech-srf04
Date: Mon, 30 Jan 2017 13:50:15 +0100 [thread overview]
Message-ID: <20170130125015.GA9714@andreas> (raw)
This patch adds dt binding for devantech ultrasonic ranger srf04.
The vendor "devantech" was already added to the vendor list with
"[PATCH v4 1/3] iio: distance: srf08: add trivial DT binding"
Signed-off-by: Andreas Klinger <ak@it-klinger.de>
---
.../bindings/iio/proximity/devantech-srf04.txt | 28 ++++++++++++++++++++++
1 file changed, 28 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/proximity/devantech-srf04.txt
diff --git a/Documentation/devicetree/bindings/iio/proximity/devantech-srf04.txt b/Documentation/devicetree/bindings/iio/proximity/devantech-srf04.txt
new file mode 100644
index 000000000000..d4dc7a227e2e
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/proximity/devantech-srf04.txt
@@ -0,0 +1,28 @@
+* 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>;
+};
--
2.1.4
reply other threads:[~2017-01-30 12:50 UTC|newest]
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