From 4cd9d10a9cd482e993dcfe3bd1d576ad0d11c3c3 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Mon, 26 Jan 2015 09:18:24 +0000
Subject: [PATCH 078/114] Add pps-gpio DT overlay

Parameters:
    gpiopin=<input pin>    // Default 18
---
 arch/arm/boot/dts/Makefile             |  1 +
 arch/arm/boot/dts/pps-gpio-overlay.dts | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)
 create mode 100644 arch/arm/boot/dts/pps-gpio-overlay.dts

--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -62,6 +62,7 @@ dtb-$(CONFIG_BCM2708_DT) += hifiberry-am
 dtb-$(CONFIG_BCM2708_DT) += iqaudio-dac-overlay.dtb
 dtb-$(CONFIG_BCM2708_DT) += iqaudio-dacplus-overlay.dtb
 dtb-$(CONFIG_BCM2708_DT) += lirc-rpi-overlay.dtb
+dtb-$(CONFIG_BCM2708_DT) += pps-gpio-overlay.dtb
 dtb-$(CONFIG_BCM2708_DT) += w1-gpio-overlay.dtb
 dtb-$(CONFIG_BCM2708_DT) += w1-gpio-pullup-overlay.dtb
 dtb-$(CONFIG_ARCH_BCM2835) += bcm2835-rpi-b.dtb
--- /dev/null
+++ b/arch/arm/boot/dts/pps-gpio-overlay.dts
@@ -0,0 +1,34 @@
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2708";
+	fragment@0 {
+		target-path = "/";
+		__overlay__ {
+			pps: pps {
+				compatible = "pps-gpio";
+				pinctrl-names = "default";
+				pinctrl-0 = <&pps_pins>;
+				gpios = <&gpio 18 0>;
+				status = "okay";
+			};
+		};
+	};
+
+	fragment@1 {
+		target = <&gpio>;
+		__overlay__ {
+			pps_pins: pps_pins {
+				brcm,pins =     <18>;
+				brcm,function = <0>;    // in
+				brcm,pull =     <0>;    // off
+			};
+		};
+	};
+
+	__overrides__ {
+		gpiopin = <&pps>,"gpios:4",
+			  <&pps_pins>,"brcm,pins:0";
+	};
+};