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Subject[PATCH v6 3/4] dt-bindings: pps: pps-gpio PPS ECHO implementation
This patch implements the device tree changes required for the pps
echo functionality for pps-gpio, that sysfs claims is available

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

Signed-off-by: Lukas Senger <>
Signed-off-by: Tom Burkart <>
Documentation/devicetree/bindings/pps/pps-gpio.txt | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/pps/pps-gpio.txt b/Documentation/devicetree/bindings/pps/pps-gpio.txt
index f7789e48a022..dabf885e568a 100644
--- a/Documentation/devicetree/bindings/pps/pps-gpio.txt
+++ b/Documentation/devicetree/bindings/pps/pps-gpio.txt
@@ -7,10 +7,15 @@ Required properties:
- compatible: should be "pps-gpio"
- pps-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)
- capture-clear: when present, also capture the PPS clear event
+- invert-pps-echo: when present, invert the PPS ECHO pulse

pps {
@@ -21,5 +26,9 @@ Example:

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