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Subject[PATCH v15 2/3] dt-bindings: pps: pps-gpio PPS ECHO implementation
This patch implements the device tree binding changes required for the
pps echo functionality for pps-gpio, that sysfs claims is available
This patch is provided separated from the rest of the patch per

This patch was originally written by Lukas Senger as part of a masters
thesis project and modified for inclusion into the linux kernel by Tom

Reviewed-by: Rob Herring <>
Signed-off-by: Lukas Senger <>
Signed-off-by: Tom Burkart <>
Documentation/devicetree/bindings/pps/pps-gpio.txt | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/pps/pps-gpio.txt b/Documentation/devicetree/bindings/pps/pps-gpio.txt
index 3683874832ae..9012a2a02e14 100644
--- a/Documentation/devicetree/bindings/pps/pps-gpio.txt
+++ b/Documentation/devicetree/bindings/pps/pps-gpio.txt
@@ -7,6 +7,10 @@ Required properties:
- compatible: should be "pps-gpio"
- gpios: one PPS GPIO in the format described by ../gpio/gpio.txt

+Additional required properties for the PPS ECHO functionality:
+- echo-gpios: one PPS ECHO GPIO in the format described by ../gpio/gpio.txt
+- echo-active-ms: duration in ms of the active portion of the echo pulse
Optional properties:
- assert-falling-edge: when present, assert is indicated by a falling edge
(instead of by a rising edge)
@@ -19,5 +23,8 @@ Example:
gpios = <&gpio1 26 GPIO_ACTIVE_HIGH>;

+ echo-gpios = <&gpio1 27 GPIO_ACTIVE_HIGH>;
+ echo-active-ms = <100>;
compatible = "pps-gpio";
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