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