From 2fea9b14e39bd6c64e362ba7d170b67d09206987 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Thu, 15 Jan 2015 10:39:06 +0000
Subject: [PATCH 070/114] Adding w1-gpio device tree overlays
N.B. Requires firmware supporting multi-target overrides
w1-gpio-overlay:
Use if a pullup pin is not required.
Parameters:
gpiopin=<i/o pin> // default 4
w1-gpio-pullup-overlay:
Use if a pullup pin is required.
Parameters:
gpiopin=<i/o pin> // default 4
pullup=<pullup pin> // default 5
---
arch/arm/boot/dts/w1-gpio-overlay.dts | 37 ++++++++++++++++++++++++++
arch/arm/boot/dts/w1-gpio-pullup-overlay.dts | 39 ++++++++++++++++++++++++++++
2 files changed, 76 insertions(+)
create mode 100644 arch/arm/boot/dts/w1-gpio-overlay.dts
create mode 100644 arch/arm/boot/dts/w1-gpio-pullup-overlay.dts
--- /dev/null
+++ b/arch/arm/boot/dts/w1-gpio-overlay.dts
@@ -0,0 +1,37 @@
+// Definitions for lirc-rpi module
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2708";
+
+ fragment@0 {
+ target-path = "/";
+ __overlay__ {
+
+ w1: onewire@0 {
+ compatible = "w1-gpio";
+ pinctrl-names = "default";
+ pinctrl-0 = <&w1_pins>;
+ gpios = <&gpio 4 0>;
+ status = "okay";
+ };
+ };
+ };
+
+ fragment@1 {
+ target = <&gpio>;
+ __overlay__ {
+ w1_pins: w1_pins {
+ brcm,pins = <4>;
+ brcm,function = <0>; // in (initially)
+ brcm,pull = <0>; // off
+ };
+ };
+ };
+
+ __overrides__ {
+ gpiopin = <&w1>,"gpios:4",
+ <&w1_pins>,"brcm,pins:0";
+ };
+};
--- /dev/null
+++ b/arch/arm/boot/dts/w1-gpio-pullup-overlay.dts
@@ -0,0 +1,39 @@
+// Definitions for lirc-rpi module
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2708";
+
+ fragment@0 {
+ target-path = "/";
+ __overlay__ {
+
+ w1: onewire@0 {
+ compatible = "w1-gpio";
+ pinctrl-names = "default";
+ pinctrl-0 = <&w1_pins>;
+ gpios = <&gpio 4 0>, <&gpio 5 1>;
+ status = "okay";
+ };
+ };
+ };
+
+ fragment@1 {
+ target = <&gpio>;
+ __overlay__ {
+ w1_pins: w1_pins {
+ brcm,pins = <4 5>;
+ brcm,function = <0 1>; // in out
+ brcm,pull = <0 0>; // off off
+ };
+ };
+ };
+
+ __overrides__ {
+ gpiopin = <&w1>,"gpios:4",
+ <&w1_pins>,"brcm,pins:0";
+ pullup = <&w1>,"gpios:16",
+ <&w1_pins>,"brcm,pins:4";
+ };
+};