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Adding w1-gpio device tree overlays

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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
This commit is contained in:
Phil Elwell
2015-01-15 10:39:06 +00:00
committed by popcornmix
parent 1b32ff2126
commit 3a26e7bd23
2 changed files with 76 additions and 0 deletions
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37
arch/arm/boot/dts/w1-gpio-overlay.dts Normal file
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// 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";
};
};

39
arch/arm/boot/dts/w1-gpio-pullup-overlay.dts Normal file
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@@ -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";
};
};