diff options
| author | Andreas Klinger <ak@it-klinger.de> | 2017-01-31 19:03:06 +0100 |
|---|---|---|
| committer | Tao Huang <huangtao@rock-chips.com> | 2019-01-07 17:59:09 +0800 |
| commit | e2f45cba7be1bfb3e37aae6a3ecf6d49259c8cf1 (patch) | |
| tree | 9d0ea6bd9ed99f935f126a858f19c0c8e2f47a3e /Documentation | |
| parent | 61a6eb94f08eb77a02c526c9e3795ea40caf1eeb (diff) | |
UPSTREAM: iio: distance: add dt binding for devantech-srf04
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"
Change-Id: I31278852798c6688f16902e3cc5222d503857667
Signed-off-by: Andreas Klinger <ak@it-klinger.de>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
(cherry picked from commit 2fb5904d92d42c88432cb29f567654d28f9d6411)
Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/iio/proximity/devantech-srf04.txt | 28 |
1 files changed, 28 insertions, 0 deletions
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>; +}; |