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Date:   Fri, 22 Mar 2019 13:42:32 +1100
From:   Tom Burkart <>
To:     Linux kernel mailing list <>,
        Andrew Morton <>
Cc:     Tom Burkart <>,
        Rodolfo Giometti <>,
        Lukas Senger <>
Subject: [PATCH v17 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

It adds two DT properties for configuring the PPS ECHO functionality.

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

Acked-by: Rodolfo Giometti <>
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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