target/linux/brcm2708/patches-4.9/950-0193-Add-overlay-for-ads1115-ADCs-1864.patch

   1 From 6d5e32067cf3f3169ec15097c175878de365d247 Mon Sep 17 00:00:00 2001
   2 From: Scott Ellis <scott@jumpnowtek.com>
   3 Date: Wed, 1 Mar 2017 07:22:24 -0500
   4 Subject: [PATCH] Add overlay for ads1115 ADCs (#1864)
   5
   6 ---
   7  arch/arm/boot/dts/overlays/Makefile            |   1 +
   8  arch/arm/boot/dts/overlays/README              |  22 ++++++
   9  arch/arm/boot/dts/overlays/ads1115-overlay.dts | 103 +++++++++++++++++++++++++
  10  3 files changed, 126 insertions(+)
  11  create mode 100644 arch/arm/boot/dts/overlays/ads1115-overlay.dts
  12
  13 --- a/arch/arm/boot/dts/overlays/Makefile
  14 +++ b/arch/arm/boot/dts/overlays/Makefile
  15 @@ -4,6 +4,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
  16         adau1977-adc.dtbo \
  17         adau7002-simple.dtbo \
  18         ads1015.dtbo \
  19 +       ads1115.dtbo \
  20         ads7846.dtbo \
  21         akkordion-iqdacplus.dtbo \
  22         allo-piano-dac-pcm512x-audio.dtbo \
  23 --- a/arch/arm/boot/dts/overlays/README
  24 +++ b/arch/arm/boot/dts/overlays/README
  25 @@ -196,6 +196,28 @@ Params: addr                    I2C bus
  26          http://www.ti.com/lit/ds/symlink/ads1015.pdf
  27
  28
  29 +Name:   ads1115
  30 +Info:   Texas Instruments ADS1115 ADC
  31 +Load:   dtoverlay=ads1115,<param>[=<val>]
  32 +Params: addr                    I2C bus address of device. Set based on how the
  33 +                                addr pin is wired. (default=0x48 assumes addr
  34 +                                is pulled to GND)
  35 +        cha_enable              Enable virtual channel a.
  36 +        cha_cfg                 Set the configuration for virtual channel a.
  37 +                                (default=4 configures this channel for the
  38 +                                voltage at A0 with respect to GND)
  39 +        cha_datarate            Set the datarate (samples/sec) for this channel.
  40 +                                (default=7 sets 860 sps)
  41 +        cha_gain                Set the gain of the Programmable Gain
  42 +                                Amplifier for this channel. (Default 1 sets the
  43 +                                full scale of the channel to 4.096 Volts)
  44 +
  45 +        Channel parameters can be set for each enabled channel.
  46 +        A maximum of 4 channels can be enabled (letters a thru d).
  47 +        For more information refer to the device datasheet at:
  48 +        http://www.ti.com/lit/ds/symlink/ads1115.pdf
  49 +
  50 +
  51  Name:   ads7846
  52  Info:   ADS7846 Touch controller
  53  Load:   dtoverlay=ads7846,<param>=<val>
  54 --- /dev/null
  55 +++ b/arch/arm/boot/dts/overlays/ads1115-overlay.dts
  56 @@ -0,0 +1,103 @@
  57 +/*
  58 + * TI ADS1115 multi-channel ADC overlay
  59 + */
  60 +
  61 +/dts-v1/;
  62 +/plugin/;
  63 +
  64 +/ {
  65 +       compatible = "brcm,bcm2708";
  66 +
  67 +       fragment@0 {
  68 +               target = <&i2c_arm>;
  69 +               __overlay__ {
  70 +                       #address-cells = <1>;
  71 +                       #size-cells = <0>;
  72 +                       status = "okay";
  73 +
  74 +                       ads1115: ads1115 {
  75 +                               compatible = "ti,ads1115";
  76 +                               status = "okay";
  77 +                               #address-cells = <1>;
  78 +                               #size-cells = <0>;
  79 +                               reg = <0x48>;
  80 +                       };
  81 +               };
  82 +       };
  83 +
  84 +       fragment@1 {
  85 +               target-path = "i2c_arm/ads1115";
  86 +               __dormant__ {
  87 +                       #address-cells = <1>;
  88 +                       #size-cells = <0>;
  89 +
  90 +                       channel_a: channel_a {
  91 +                               reg = <4>;
  92 +                               ti,gain = <1>;
  93 +                               ti,datarate = <7>;
  94 +                       };
  95 +               };
  96 +       };
  97 +
  98 +       fragment@2 {
  99 +               target-path = "i2c_arm/ads1115";
 100 +               __dormant__ {
 101 +                       #address-cells = <1>;
 102 +                       #size-cells = <0>;
 103 +
 104 +                       channel_b: channel_b {
 105 +                               reg = <5>;
 106 +                               ti,gain = <1>;
 107 +                               ti,datarate = <7>;
 108 +                       };
 109 +               };
 110 +       };
 111 +
 112 +       fragment@3 {
 113 +               target-path = "i2c_arm/ads1115";
 114 +               __dormant__ {
 115 +                       #address-cells = <1>;
 116 +                       #size-cells = <0>;
 117 +
 118 +                       channel_c: channel_c {
 119 +                               reg = <6>;
 120 +                               ti,gain = <1>;
 121 +                               ti,datarate = <7>;
 122 +                       };
 123 +               };
 124 +       };
 125 +
 126 +       fragment@4 {
 127 +               target-path = "i2c_arm/ads1115";
 128 +               __dormant__ {
 129 +                       #address-cells = <1>;
 130 +                       #size-cells = <0>;
 131 +
 132 +                       channel_d: channel_d {
 133 +                               reg = <7>;
 134 +                               ti,gain = <1>;
 135 +                               ti,datarate = <7>;
 136 +                       };
 137 +               };
 138 +       };
 139 +
 140 +       __overrides__ {
 141 +               addr =            <&ads1115>,"reg:0";
 142 +               cha_enable =      <0>,"=1";
 143 +               cha_cfg =         <&channel_a>,"reg:0";
 144 +               cha_gain =        <&channel_a>,"ti,gain:0";
 145 +               cha_datarate =    <&channel_a>,"ti,datarate:0";
 146 +               chb_enable =      <0>,"=2";
 147 +               chb_cfg =         <&channel_b>,"reg:0";
 148 +               chb_gain =        <&channel_b>,"ti,gain:0";
 149 +               chb_datarate =    <&channel_b>,"ti,datarate:0";
 150 +               chc_enable =      <0>,"=3";
 151 +               chc_cfg =         <&channel_c>,"reg:0";
 152 +               chc_gain =        <&channel_c>,"ti,gain:0";
 153 +               chc_datarate =    <&channel_c>,"ti,datarate:0";
 154 +               chd_enable =      <0>,"=4";
 155 +               chd_cfg =         <&channel_d>,"reg:0";
 156 +               chd_gain =        <&channel_d>,"ti,gain:0";
 157 +               chd_datarate =    <&channel_d>,"ti,datarate:0";
 158 +       };
 159 +};