target/linux/brcm2708/patches-3.18/0070-Adding-w1-gpio-device-tree-overlays.patch

   1 From 2fea9b14e39bd6c64e362ba7d170b67d09206987 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Thu, 15 Jan 2015 10:39:06 +0000
   4 Subject: [PATCH 070/114] Adding w1-gpio device tree overlays
   5
   6 N.B. Requires firmware supporting multi-target overrides
   7
   8 w1-gpio-overlay:
   9   Use if a pullup pin is not required.
  10   Parameters:
  11     gpiopin=<i/o pin>     // default 4
  12
  13 w1-gpio-pullup-overlay:
  14   Use if a pullup pin is required.
  15   Parameters:
  16     gpiopin=<i/o pin>     // default 4
  17     pullup=<pullup pin>   // default 5
  18 ---
  19  arch/arm/boot/dts/w1-gpio-overlay.dts        | 37 ++++++++++++++++++++++++++
  20  arch/arm/boot/dts/w1-gpio-pullup-overlay.dts | 39 ++++++++++++++++++++++++++++
  21  2 files changed, 76 insertions(+)
  22  create mode 100644 arch/arm/boot/dts/w1-gpio-overlay.dts
  23  create mode 100644 arch/arm/boot/dts/w1-gpio-pullup-overlay.dts
  24
  25 --- /dev/null
  26 +++ b/arch/arm/boot/dts/w1-gpio-overlay.dts
  27 @@ -0,0 +1,37 @@
  28 +// Definitions for lirc-rpi module
  29 +/dts-v1/;
  30 +/plugin/;
  31 +
  32 +/ {
  33 +       compatible = "brcm,bcm2708";
  34 +
  35 +       fragment@0 {
  36 +               target-path = "/";
  37 +               __overlay__ {
  38 +
  39 +                       w1: onewire@0 {
  40 +                               compatible = "w1-gpio";
  41 +                               pinctrl-names = "default";
  42 +                               pinctrl-0 = <&w1_pins>;
  43 +                               gpios = <&gpio 4 0>;
  44 +                               status = "okay";
  45 +                       };
  46 +               };
  47 +       };
  48 +
  49 +       fragment@1 {
  50 +               target = <&gpio>;
  51 +               __overlay__ {
  52 +                       w1_pins: w1_pins {
  53 +                               brcm,pins = <4>;
  54 +                               brcm,function = <0>; // in (initially)
  55 +                               brcm,pull = <0>; // off
  56 +                       };
  57 +               };
  58 +       };
  59 +
  60 +       __overrides__ {
  61 +               gpiopin =       <&w1>,"gpios:4",
  62 +                               <&w1_pins>,"brcm,pins:0";
  63 +       };
  64 +};
  65 --- /dev/null
  66 +++ b/arch/arm/boot/dts/w1-gpio-pullup-overlay.dts
  67 @@ -0,0 +1,39 @@
  68 +// Definitions for lirc-rpi module
  69 +/dts-v1/;
  70 +/plugin/;
  71 +
  72 +/ {
  73 +       compatible = "brcm,bcm2708";
  74 +
  75 +       fragment@0 {
  76 +               target-path = "/";
  77 +               __overlay__ {
  78 +
  79 +                       w1: onewire@0 {
  80 +                               compatible = "w1-gpio";
  81 +                               pinctrl-names = "default";
  82 +                               pinctrl-0 = <&w1_pins>;
  83 +                               gpios = <&gpio 4 0>, <&gpio 5 1>;
  84 +                               status = "okay";
  85 +                       };
  86 +               };
  87 +       };
  88 +
  89 +       fragment@1 {
  90 +               target = <&gpio>;
  91 +               __overlay__ {
  92 +                       w1_pins: w1_pins {
  93 +                               brcm,pins = <4 5>;
  94 +                               brcm,function = <0 1>; // in out
  95 +                               brcm,pull = <0 0>; // off off
  96 +                       };
  97 +               };
  98 +       };
  99 +
 100 +       __overrides__ {
 101 +               gpiopin =       <&w1>,"gpios:4",
 102 +                               <&w1_pins>,"brcm,pins:0";
 103 +               pullup =        <&w1>,"gpios:16",
 104 +                               <&w1_pins>,"brcm,pins:4";
 105 +       };
 106 +};