From b90a1393b3bdffa88c8e8dfbdc2bec650a5f885e Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Tue, 9 Aug 2016 21:51:41 +0100
Subject: [PATCH] overlays: Add assert_falling_edge to pps-gpio overlay

See: https://github.com/raspberrypi/linux/issues/1590
---
 arch/arm/boot/dts/overlays/README               | 2 ++
 arch/arm/boot/dts/overlays/pps-gpio-overlay.dts | 1 +
 2 files changed, 3 insertions(+)

--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -797,6 +797,8 @@ Name:   pps-gpio
 Info:   Configures the pps-gpio (pulse-per-second time signal via GPIO).
 Load:   dtoverlay=pps-gpio,<param>=<val>
 Params: gpiopin                 Input GPIO (default "18")
+        assert_falling_edge     When present, assert is indicated by a falling
+                                edge, rather than by a rising edge
 
 
 Name:   pwm
--- a/arch/arm/boot/dts/overlays/pps-gpio-overlay.dts
+++ b/arch/arm/boot/dts/overlays/pps-gpio-overlay.dts
@@ -30,5 +30,6 @@
 	__overrides__ {
 		gpiopin = <&pps>,"gpios:4",
 			  <&pps_pins>,"brcm,pins:0";
+		assert_falling_edge = <&pps>,"assert-falling-edge?";
 	};
 };