target/linux/brcm2708/patches-4.4/0360-Added-Overlay-for-Microchip-MCP23017-I2C-gpio-expand.patch

   1 From 55e8faa999c9bf3ae4a3fb75faf5e991167c42ba Mon Sep 17 00:00:00 2001
   2 From: Michael Kaplan <m.kaplan@evva.com>
   3 Date: Tue, 24 May 2016 10:19:08 +0200
   4 Subject: [PATCH 360/381] Added Overlay for Microchip MCP23017 I2C gpio
   5  expander
   6
   7 ---
   8  arch/arm/boot/dts/overlays/README               |  9 +++++
   9  arch/arm/boot/dts/overlays/mcp23017-overlay.dts | 54 +++++++++++++++++++++++++
  10  2 files changed, 63 insertions(+)
  11  create mode 100644 arch/arm/boot/dts/overlays/mcp23017-overlay.dts
  12
  13 --- a/arch/arm/boot/dts/overlays/README
  14 +++ b/arch/arm/boot/dts/overlays/README
  15 @@ -567,6 +567,15 @@ Params: gpio_out_pin            GPIO for
  16                                  (default "off")
  17
  18
  19 +Name:   mcp23017
  20 +Info:   Configures the MCP23017 I2C port expander
  21 +Load:   dtoverlay=mcp23017,<param>=<val>
  22 +Params: gpiopin                 Gpio pin connected to the INTA output of the
  23 +                                MCP23017 (default: 4)
  24 +
  25 +        addr                    I2C address of the MCP23017 (default: 0x20)
  26 +
  27 +
  28  Name:   mcp2515-can0
  29  Info:   Configures the MCP2515 CAN controller on spi0.0
  30  Load:   dtoverlay=mcp2515-can0,<param>=<val>
  31 --- /dev/null
  32 +++ b/arch/arm/boot/dts/overlays/mcp23017-overlay.dts
  33 @@ -0,0 +1,54 @@
  34 +// Definitions for MCP23017 Gpio Extender from Microchip Semiconductor
  35 +
  36 +/dts-v1/;
  37 +/plugin/;
  38 +
  39 +/ {
  40 +       compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
  41 +
  42 +       fragment@0 {
  43 +               target = <&i2c1>;
  44 +               __overlay__ {
  45 +                       status = "okay";
  46 +               };
  47 +       };
  48 +
  49 +       fragment@1 {
  50 +               target = <&gpio>;
  51 +               __overlay__ {
  52 +                       mcp23017_pins: mcp23017_pins {
  53 +                               brcm,pins = <4>;
  54 +                               brcm,function = <0>;
  55 +                       };
  56 +               };
  57 +       };
  58 +
  59 +       fragment@2 {
  60 +               target = <&i2c1>;
  61 +               __overlay__ {
  62 +                       #address-cells = <1>;
  63 +                       #size-cells = <0>;
  64 +
  65 +                       mcp23017: mcp@20 {
  66 +                               compatible = "microchip,mcp23017";
  67 +                               reg = <0x20>;
  68 +                               gpio-controller;
  69 +                               #gpio-cells = <2>;
  70 +                               #interrupt-cells=<2>;
  71 +                               interrupt-parent = <&gpio>;
  72 +                               interrupts = <4 2>;
  73 +                               interrupt-controller;
  74 +                               microchip,irq-mirror;
  75 +
  76 +                               status = "okay";
  77 +                       };
  78 +               };
  79 +       };
  80 +
  81 +       __overrides__ {
  82 +               gpiopin = <&mcp23017_pins>,"brcm,pins:0",
  83 +                               <&mcp23017>,"interrupts:0";
  84 +               addr = <&mcp23017>,"reg:0";
  85 +       };
  86 +};
  87 +