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- 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";
- + };
- +};
|
