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 diff --git a/arch/arm/boot/dts/w1-gpio-overlay.dts b/arch/arm/boot/dts/w1-gpio-overlay.dts
  26 new file mode 100644
  27 index 0000000..b2c5ee2
  28 --- /dev/null
  29 +++ b/arch/arm/boot/dts/w1-gpio-overlay.dts
  30 @@ -0,0 +1,37 @@
  31 +// Definitions for lirc-rpi module
  32 +/dts-v1/;
  33 +/plugin/;
  34 +
  35 +/ {
  36 +       compatible = "brcm,bcm2708";
  37 +
  38 +       fragment@0 {
  39 +               target-path = "/";
  40 +               __overlay__ {
  41 +
  42 +                       w1: onewire@0 {
  43 +                               compatible = "w1-gpio";
  44 +                               pinctrl-names = "default";
  45 +                               pinctrl-0 = <&w1_pins>;
  46 +                               gpios = <&gpio 4 0>;
  47 +                               status = "okay";
  48 +                       };
  49 +               };
  50 +       };
  51 +
  52 +       fragment@1 {
  53 +               target = <&gpio>;
  54 +               __overlay__ {
  55 +                       w1_pins: w1_pins {
  56 +                               brcm,pins = <4>;
  57 +                               brcm,function = <0>; // in (initially)
  58 +                               brcm,pull = <0>; // off
  59 +                       };
  60 +               };
  61 +       };
  62 +
  63 +       __overrides__ {
  64 +               gpiopin =       <&w1>,"gpios:4",
  65 +                               <&w1_pins>,"brcm,pins:0";
  66 +       };
  67 +};
  68 diff --git a/arch/arm/boot/dts/w1-gpio-pullup-overlay.dts b/arch/arm/boot/dts/w1-gpio-pullup-overlay.dts
  69 new file mode 100644
  70 index 0000000..b3e97c2
  71 --- /dev/null
  72 +++ b/arch/arm/boot/dts/w1-gpio-pullup-overlay.dts
  73 @@ -0,0 +1,39 @@
  74 +// Definitions for lirc-rpi module
  75 +/dts-v1/;
  76 +/plugin/;
  77 +
  78 +/ {
  79 +       compatible = "brcm,bcm2708";
  80 +
  81 +       fragment@0 {
  82 +               target-path = "/";
  83 +               __overlay__ {
  84 +
  85 +                       w1: onewire@0 {
  86 +                               compatible = "w1-gpio";
  87 +                               pinctrl-names = "default";
  88 +                               pinctrl-0 = <&w1_pins>;
  89 +                               gpios = <&gpio 4 0>, <&gpio 5 1>;
  90 +                               status = "okay";
  91 +                       };
  92 +               };
  93 +       };
  94 +
  95 +       fragment@1 {
  96 +               target = <&gpio>;
  97 +               __overlay__ {
  98 +                       w1_pins: w1_pins {
  99 +                               brcm,pins = <4 5>;
 100 +                               brcm,function = <0 1>; // in out
 101 +                               brcm,pull = <0 0>; // off off
 102 +                       };
 103 +               };
 104 +       };
 105 +
 106 +       __overrides__ {
 107 +               gpiopin =       <&w1>,"gpios:4",
 108 +                               <&w1_pins>,"brcm,pins:0";
 109 +               pullup =        <&w1>,"gpios:16",
 110 +                               <&w1_pins>,"brcm,pins:4";
 111 +       };
 112 +};
 113 --
 114 1.8.3.2
 115