target/linux/brcm2708/patches-4.4/0386-Add-ads1015-overlay.patch

   1 From 940b863512662c2da10729fbb6d57fe072c9b887 Mon Sep 17 00:00:00 2001
   2 From: Erik Sejr <erik@eriks.ssimicro.com>
   3 Date: Tue, 7 Jun 2016 20:58:17 -0400
   4 Subject: [PATCH] Add ads1015 overlay
   5
   6 See: https://github.com/raspberrypi/linux/pull/1520
   7 ---
   8  arch/arm/boot/dts/overlays/Makefile            |  1 +
   9  arch/arm/boot/dts/overlays/README              | 22 ++++++
  10  arch/arm/boot/dts/overlays/ads1015-overlay.dts | 98 ++++++++++++++++++++++++++
  11  3 files changed, 121 insertions(+)
  12  create mode 100644 arch/arm/boot/dts/overlays/ads1015-overlay.dts
  13
  14 --- a/arch/arm/boot/dts/overlays/Makefile
  15 +++ b/arch/arm/boot/dts/overlays/Makefile
  16 @@ -13,6 +13,7 @@ ifeq ($(CONFIG_ARCH_BCM2835),y)
  17  endif
  18
  19  dtbo-$(RPI_DT_OVERLAYS) += adau1977-adc.dtbo
  20 +dtbo-$(RPI_DT_OVERLAYS) += ads1015.dtbo
  21  dtbo-$(RPI_DT_OVERLAYS) += ads7846.dtbo
  22  dtbo-$(RPI_DT_OVERLAYS) += akkordion-iqdacplus.dtbo
  23  dtbo-$(RPI_DT_OVERLAYS) += at86rf233.dtbo
  24 --- a/arch/arm/boot/dts/overlays/README
  25 +++ b/arch/arm/boot/dts/overlays/README
  26 @@ -168,6 +168,28 @@ Load:   dtoverlay=adau1977-adc
  27  Params: <None>
  28
  29
  30 +Name:   ads1015
  31 +Info:   Overlay for activation of Texas Instruments ADS1015 ADC over I2C
  32 +Load:   dtoverlay=ads1015,<param>=<val>
  33 +Params: addr                    I2C bus address of device. Set based on how the
  34 +                                addr pin is wired. (default=0x48 assumes addr
  35 +                                is pulled to GND)
  36 +        cha_enable              Enable virtual channel a. (default=true)
  37 +        cha_cfg                 Set the configuration for virtual channel a.
  38 +                                (default=4 configures this channel for the
  39 +                                voltage at A0 with respect to GND)
  40 +        cha_datarate            Set the datarate (samples/sec) for this channel.
  41 +                                (default=4 sets 1600 sps)
  42 +        cha_gain                Set the gain of the Programmable Gain
  43 +                                Amplifier for this channel. (default=2 sets the
  44 +                                full scale of the channel to 2.048 Volts)
  45 +
  46 +        Channel (ch) parameters can be set for each enabled channel.
  47 +        A maximum of 4 channels can be enabled (letters a thru d).
  48 +        For more information refer to the device datasheet at:
  49 +        http://www.ti.com/lit/ds/symlink/ads1015.pdf
  50 +
  51 +
  52  Name:   ads7846
  53  Info:   ADS7846 Touch controller
  54  Load:   dtoverlay=ads7846,<param>=<val>
  55 --- /dev/null
  56 +++ b/arch/arm/boot/dts/overlays/ads1015-overlay.dts
  57 @@ -0,0 +1,98 @@
  58 +/*
  59 + * 2016 - Erik Sejr
  60 + */
  61 +/dts-v1/;
  62 +/plugin/;
  63 +
  64 +/ {
  65 +    compatible = "brcm,bcm2708";
  66 +    /* ----------- ADS1015 ------------ */
  67 +    fragment@0 {
  68 +        target = <&i2c_arm>;
  69 +        __overlay__ {
  70 +            #address-cells = <1>;
  71 +            #size-cells = <0>;
  72 +            status = "okay";
  73 +            ads1015: ads1015 {
  74 +                compatible = "ti,ads1015";
  75 +                status = "okay";
  76 +                #address-cells = <1>;
  77 +                #size-cells = <0>;
  78 +                reg = <0x48>;
  79 +            };
  80 +        };
  81 +    };
  82 +
  83 +    fragment@1 {
  84 +        target-path = "i2c_arm/ads1015";
  85 +        __overlay__ {
  86 +            #address-cells = <1>;
  87 +            #size-cells = <0>;
  88 +            channel_a: channel_a {
  89 +                reg = <4>;
  90 +                ti,gain = <2>;
  91 +                ti,datarate = <4>;
  92 +            };
  93 +        };
  94 +    };
  95 +
  96 +    fragment@2 {
  97 +        target-path = "i2c_arm/ads1015";
  98 +        __dormant__ {
  99 +            #address-cells = <1>;
 100 +            #size-cells = <0>;
 101 +            channel_b: channel_b {
 102 +                reg = <5>;
 103 +                ti,gain = <2>;
 104 +                ti,datarate = <4>;
 105 +            };
 106 +        };
 107 +    };
 108 +
 109 +    fragment@3 {
 110 +        target-path = "i2c_arm/ads1015";
 111 +        __dormant__ {
 112 +            #address-cells = <1>;
 113 +            #size-cells = <0>;
 114 +            channel_c: channel_c {
 115 +                reg = <6>;
 116 +                ti,gain = <2>;
 117 +                ti,datarate = <4>;
 118 +            };
 119 +        };
 120 +    };
 121 +
 122 +    fragment@4 {
 123 +        target-path = "i2c_arm/ads1015";
 124 +        __dormant__ {
 125 +            #address-cells = <1>;
 126 +            #size-cells = <0>;
 127 +            channel_d: channel_d {
 128 +                reg = <7>;
 129 +                ti,gain = <2>;
 130 +                ti,datarate = <4>;
 131 +            };
 132 +        };
 133 +    };
 134 +
 135 +    __overrides__ {
 136 +        addr =            <&ads1015>,"reg:0";
 137 +        cha_enable =      <0>,"=1";
 138 +        cha_cfg =         <&channel_a>,"reg:0";
 139 +        cha_gain =        <&channel_a>,"ti,gain:0";
 140 +        cha_datarate =    <&channel_a>,"ti,datarate:0";
 141 +        chb_enable =      <0>,"=2";
 142 +        chb_cfg =         <&channel_b>,"reg:0";
 143 +        chb_gain =        <&channel_b>,"ti,gain:0";
 144 +        chb_datarate =    <&channel_b>,"ti,datarate:0";
 145 +        chc_enable =      <0>,"=3";
 146 +        chc_cfg =         <&channel_c>,"reg:0";
 147 +        chc_gain =        <&channel_c>,"ti,gain:0";
 148 +        chc_datarate =    <&channel_c>,"ti,datarate:0";
 149 +        chd_enable =      <0>,"=4";
 150 +        chd_cfg =         <&channel_d>,"reg:0";
 151 +        chd_gain =        <&channel_d>,"ti,gain:0";
 152 +        chd_datarate =    <&channel_d>,"ti,datarate:0";
 153 +   };
 154 +
 155 +};