target/linux/brcm2708/patches-4.4/0355-Added-Overlay-for-Microchip-MCP23017-I2C-gpio-expand.patch

   1 From 58c72d20f05a5943b48d834e8388a58332897ed8 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] Added Overlay for Microchip MCP23017 I2C gpio expander
   5
   6 ---
   7  arch/arm/boot/dts/overlays/README               |  9 +++++
   8  arch/arm/boot/dts/overlays/mcp23017-overlay.dts | 54 +++++++++++++++++++++++++
   9  2 files changed, 63 insertions(+)
  10  create mode 100644 arch/arm/boot/dts/overlays/mcp23017-overlay.dts
  11
  12 --- a/arch/arm/boot/dts/overlays/README
  13 +++ b/arch/arm/boot/dts/overlays/README
  14 @@ -567,6 +567,15 @@ Params: gpio_out_pin            GPIO for
  15                                  (default "off")
  16
  17
  18 +Name:   mcp23017
  19 +Info:   Configures the MCP23017 I2C port expander
  20 +Load:   dtoverlay=mcp23017,<param>=<val>
  21 +Params: gpiopin                 Gpio pin connected to the INTA output of the
  22 +                                MCP23017 (default: 4)
  23 +
  24 +        addr                    I2C address of the MCP23017 (default: 0x20)
  25 +
  26 +
  27  Name:   mcp2515-can0
  28  Info:   Configures the MCP2515 CAN controller on spi0.0
  29  Load:   dtoverlay=mcp2515-can0,<param>=<val>
  30 --- /dev/null
  31 +++ b/arch/arm/boot/dts/overlays/mcp23017-overlay.dts
  32 @@ -0,0 +1,54 @@
  33 +// Definitions for MCP23017 Gpio Extender from Microchip Semiconductor
  34 +
  35 +/dts-v1/;
  36 +/plugin/;
  37 +
  38 +/ {
  39 +       compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
  40 +
  41 +       fragment@0 {
  42 +               target = <&i2c1>;
  43 +               __overlay__ {
  44 +                       status = "okay";
  45 +               };
  46 +       };
  47 +
  48 +       fragment@1 {
  49 +               target = <&gpio>;
  50 +               __overlay__ {
  51 +                       mcp23017_pins: mcp23017_pins {
  52 +                               brcm,pins = <4>;
  53 +                               brcm,function = <0>;
  54 +                       };
  55 +               };
  56 +       };
  57 +
  58 +       fragment@2 {
  59 +               target = <&i2c1>;
  60 +               __overlay__ {
  61 +                       #address-cells = <1>;
  62 +                       #size-cells = <0>;
  63 +
  64 +                       mcp23017: mcp@20 {
  65 +                               compatible = "microchip,mcp23017";
  66 +                               reg = <0x20>;
  67 +                               gpio-controller;
  68 +                               #gpio-cells = <2>;
  69 +                               #interrupt-cells=<2>;
  70 +                               interrupt-parent = <&gpio>;
  71 +                               interrupts = <4 2>;
  72 +                               interrupt-controller;
  73 +                               microchip,irq-mirror;
  74 +
  75 +                               status = "okay";
  76 +                       };
  77 +               };
  78 +       };
  79 +
  80 +       __overrides__ {
  81 +               gpiopin = <&mcp23017_pins>,"brcm,pins:0",
  82 +                               <&mcp23017>,"interrupts:0";
  83 +               addr = <&mcp23017>,"reg:0";
  84 +       };
  85 +};
  86 +