target/linux/brcm2708/patches-4.19/950-0268-overlays-Add-mcp342x-overlay.patch

   1 From b71f1fd962c66ba3fa46483f193cc2263146c5bf Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Mon, 21 Jan 2019 12:23:55 +0000
   4 Subject: [PATCH] overlays: Add mcp342x overlay
   5
   6 Support the MCP342x family of ADCs from Microchip.
   7
   8 See: https://github.com/raspberrypi/linux/issues/2819
   9
  10 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  11 ---
  12  arch/arm/boot/dts/overlays/Makefile           |  1 +
  13  arch/arm/boot/dts/overlays/README             | 16 ++++
  14  .../arm/boot/dts/overlays/mcp342x-overlay.dts | 93 +++++++++++++++++++
  15  3 files changed, 110 insertions(+)
  16  create mode 100644 arch/arm/boot/dts/overlays/mcp342x-overlay.dts
  17
  18 --- a/arch/arm/boot/dts/overlays/Makefile
  19 +++ b/arch/arm/boot/dts/overlays/Makefile
  20 @@ -79,6 +79,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
  21         mcp2515-can1.dtbo \
  22         mcp3008.dtbo \
  23         mcp3202.dtbo \
  24 +       mcp342x.dtbo \
  25         media-center.dtbo \
  26         midi-uart0.dtbo \
  27         midi-uart1.dtbo \
  28 --- a/arch/arm/boot/dts/overlays/README
  29 +++ b/arch/arm/boot/dts/overlays/README
  30 @@ -1277,6 +1277,22 @@ Params: spi<n>-<m>-present      boolean,
  31          spi<n>-<m>-speed        integer, set the spi bus speed for this device
  32
  33
  34 +Name:   mcp342x
  35 +Info:   Overlay for activation of Microchip MCP3421-3428 ADCs over I2C
  36 +Load:   dtoverlay=mcp342x,<param>=<val>
  37 +Params: addr                    I2C bus address of device, for devices with
  38 +                                addresses that are configurable, e.g. by
  39 +                                hardware links (default=0x68)
  40 +        mcp3421                 The device is an MCP3421
  41 +        mcp3422                 The device is an MCP3422
  42 +        mcp3423                 The device is an MCP3423
  43 +        mcp3424                 The device is an MCP3424
  44 +        mcp3425                 The device is an MCP3425
  45 +        mcp3426                 The device is an MCP3426
  46 +        mcp3427                 The device is an MCP3427
  47 +        mcp3428                 The device is an MCP3428
  48 +
  49 +
  50  Name:   media-center
  51  Info:   Media Center HAT - 2.83" Touch Display + extras by Pi Supply
  52  Load:   dtoverlay=media-center,<param>=<val>
  53 --- /dev/null
  54 +++ b/arch/arm/boot/dts/overlays/mcp342x-overlay.dts
  55 @@ -0,0 +1,93 @@
  56 +// Overlay for MCP3421-8 ADCs from Microchip Semiconductor
  57 +
  58 +/dts-v1/;
  59 +/plugin/;
  60 +
  61 +/ {
  62 +       compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
  63 +
  64 +       fragment@0 {
  65 +               target = <&i2c1>;
  66 +               __overlay__ {
  67 +                       #address-cells = <1>;
  68 +                       #size-cells = <0>;
  69 +
  70 +                       status = "okay";
  71 +
  72 +                       mcp342x: mcp@68 {
  73 +                               reg = <0x68>;
  74 +
  75 +                               status = "okay";
  76 +                       };
  77 +               };
  78 +       };
  79 +
  80 +       fragment@1 {
  81 +               target = <&mcp342x>;
  82 +               __dormant__ {
  83 +                       compatible = "microchip,mcp3421";
  84 +               };
  85 +       };
  86 +
  87 +       fragment@2 {
  88 +               target = <&mcp342x>;
  89 +               __dormant__ {
  90 +                       compatible = "microchip,mcp3422";
  91 +               };
  92 +       };
  93 +
  94 +       fragment@3 {
  95 +               target = <&mcp342x>;
  96 +               __dormant__ {
  97 +                       compatible = "microchip,mcp3423";
  98 +               };
  99 +       };
 100 +
 101 +       fragment@4 {
 102 +               target = <&mcp342x>;
 103 +               __dormant__ {
 104 +                       compatible = "microchip,mcp3424";
 105 +               };
 106 +       };
 107 +
 108 +       fragment@5 {
 109 +               target = <&mcp342x>;
 110 +               __dormant__ {
 111 +                       compatible = "microchip,mcp3425";
 112 +               };
 113 +       };
 114 +
 115 +       fragment@6 {
 116 +               target = <&mcp342x>;
 117 +               __dormant__ {
 118 +                       compatible = "microchip,mcp3426";
 119 +               };
 120 +       };
 121 +
 122 +       fragment@7 {
 123 +               target = <&mcp342x>;
 124 +               __dormant__ {
 125 +                       compatible = "microchip,mcp3427";
 126 +               };
 127 +       };
 128 +
 129 +       fragment@8 {
 130 +               target = <&mcp342x>;
 131 +               __dormant__ {
 132 +                       compatible = "microchip,mcp3428";
 133 +               };
 134 +       };
 135 +
 136 +       __overrides__ {
 137 +               addr = <&mcp342x>,"reg:0";
 138 +               mcp3421 = <0>,"=1";
 139 +               mcp3422 = <0>,"=2";
 140 +               mcp3423 = <0>,"=3";
 141 +               mcp3424 = <0>,"=4";
 142 +               mcp3425 = <0>,"=5";
 143 +               mcp3426 = <0>,"=6";
 144 +               mcp3427 = <0>,"=7";
 145 +               mcp3428 = <0>,"=8";
 146 +       };
 147 +};
 148 +