target/linux/brcm2708/patches-4.9/950-0138-Add-overlay-for-mcp3008-adc-1818.patch

   1 From 33800ba2a14ff23db96fe5ea6e421a731f60c52b Mon Sep 17 00:00:00 2001
   2 From: Scott Ellis <scott@jumpnowtek.com>
   3 Date: Fri, 27 Jan 2017 06:42:42 -0500
   4 Subject: [PATCH] Add overlay for mcp3008 adc (#1818)
   5
   6 Some example usage:
   7
   8 SPI0.0
   9 dtparam=spi=on
  10 dtoverlay=mcp3008:spi0-0-present
  11
  12 SPI0.1
  13 dtparam=spi=on
  14 dtoverlay=mcp3008:spi0-1-present
  15
  16 SPI0.0 and SPI0.1
  17 dtparam=spi=on
  18 dtoverlay=mcp3008:spi0-0-present,spi0-1-present
  19
  20 SPI1.0
  21 dtparam=spi=on
  22 dtoverlay=spi1-1cs
  23 dtoverlay=mcp3008:spi1-0-present
  24
  25 SPI1.2
  26 dtparam=spi=on
  27 dtoverlay=spi1-1cs:cs0_pin=16
  28 dtoverlay=mcp3008:spi1-0-present
  29
  30 SPI1.0 and SPI1.1
  31 dtoverlay=spi1-2cs
  32 dtoverlay=mcp3008:spi1-0-present,spi1-1-present
  33
  34 Changing the speed
  35
  36 SPI0.0
  37 dtparam=spi=on
  38 dtoverlay=mcp3008:spi0-0-present,spi0-0-speed=2000000
  39 ---
  40  arch/arm/boot/dts/overlays/Makefile            |   1 +
  41  arch/arm/boot/dts/overlays/README              |   9 ++
  42  arch/arm/boot/dts/overlays/mcp3008-overlay.dts | 205 +++++++++++++++++++++++++
  43  3 files changed, 215 insertions(+)
  44  create mode 100755 arch/arm/boot/dts/overlays/mcp3008-overlay.dts
  45
  46 --- a/arch/arm/boot/dts/overlays/Makefile
  47 +++ b/arch/arm/boot/dts/overlays/Makefile
  48 @@ -47,6 +47,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
  49         mcp23s17.dtbo \
  50         mcp2515-can0.dtbo \
  51         mcp2515-can1.dtbo \
  52 +       mcp3008.dtbo \
  53         midi-uart0.dtbo \
  54         mmc.dtbo \
  55         mz61581.dtbo \
  56 --- a/arch/arm/boot/dts/overlays/README
  57 +++ b/arch/arm/boot/dts/overlays/README
  58 @@ -742,6 +742,15 @@ Params: oscillator              Clock fr
  59          interrupt               GPIO for interrupt signal
  60
  61
  62 +Name:   mcp3008
  63 +Info:   Configures MCP3008 A/D converters
  64 +        For devices on spi1 or spi2, the interfaces should be enabled
  65 +        with one of the spi1-1/2/3cs and/or spi2-1/2/3cs overlays.
  66 +Load:   dtoverlay=mcp3008,<param>[=<val>]
  67 +Params: spi<n>-<m>-present      boolean, configure device at spi<n>, cs<m>
  68 +        spi<n>-<m>-speed        integer, set the spi bus speed for this device
  69 +
  70 +
  71  Name:   midi-uart0
  72  Info:   Configures UART0 (ttyAMA0) so that a requested 38.4kbaud actually gets
  73          31.25kbaud, the frequency required for MIDI
  74 --- /dev/null
  75 +++ b/arch/arm/boot/dts/overlays/mcp3008-overlay.dts
  76 @@ -0,0 +1,205 @@
  77 +/*
  78 + * Device tree overlay for Microchip mcp3008 10-Bit A/D Converters
  79 + */
  80 +
  81 +/dts-v1/;
  82 +/plugin/;
  83 +
  84 +/ {
  85 +       compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
  86 +
  87 +       fragment@0 {
  88 +               target = <&spidev0>;
  89 +               __dormant__ {
  90 +                       status = "disabled";
  91 +               };
  92 +       };
  93 +
  94 +       fragment@1 {
  95 +               target = <&spidev1>;
  96 +               __dormant__ {
  97 +                       status = "disabled";
  98 +               };
  99 +       };
 100 +
 101 +       fragment@2 {
 102 +               target-path = "spi1/spidev@0";
 103 +               __dormant__ {
 104 +                       status = "disabled";
 105 +               };
 106 +       };
 107 +
 108 +       fragment@3 {
 109 +               target-path = "spi1/spidev@1";
 110 +               __dormant__ {
 111 +                       status = "disabled";
 112 +               };
 113 +       };
 114 +
 115 +       fragment@4 {
 116 +               target-path = "spi1/spidev@2";
 117 +               __dormant__ {
 118 +                       status = "disabled";
 119 +               };
 120 +       };
 121 +
 122 +       fragment@5 {
 123 +               target-path = "spi2/spidev@0";
 124 +               __dormant__ {
 125 +                       status = "disabled";
 126 +               };
 127 +       };
 128 +
 129 +       fragment@6 {
 130 +               target-path = "spi2/spidev@1";
 131 +               __dormant__ {
 132 +                       status = "disabled";
 133 +               };
 134 +       };
 135 +
 136 +       fragment@7 {
 137 +               target-path = "spi2/spidev@2";
 138 +               __dormant__ {
 139 +                       status = "disabled";
 140 +               };
 141 +       };
 142 +
 143 +       fragment@8 {
 144 +               target = <&spi0>;
 145 +               __dormant__ {
 146 +                       status = "okay";
 147 +                       #address-cells = <1>;
 148 +                       #size-cells = <0>;
 149 +
 150 +                       mcp3008_00: mcp3008@0 {
 151 +                               compatible = "mcp3008";
 152 +                               reg = <0>;
 153 +                               spi-max-frequency = <1600000>;
 154 +                       };
 155 +               };
 156 +       };
 157 +
 158 +       fragment@9 {
 159 +               target = <&spi0>;
 160 +               __dormant__ {
 161 +                       status = "okay";
 162 +                       #address-cells = <1>;
 163 +                       #size-cells = <0>;
 164 +
 165 +                       mcp3008_01: mcp3008@1 {
 166 +                               compatible = "mcp3008";
 167 +                               reg = <1>;
 168 +                               spi-max-frequency = <1600000>;
 169 +                       };
 170 +               };
 171 +       };
 172 +
 173 +       fragment@10 {
 174 +               target = <&spi1>;
 175 +               __dormant__ {
 176 +                       status = "okay";
 177 +                       #address-cells = <1>;
 178 +                       #size-cells = <0>;
 179 +
 180 +                       mcp3008_10: mcp3008@0 {
 181 +                               compatible = "mcp3008";
 182 +                               reg = <0>;
 183 +                               spi-max-frequency = <1600000>;
 184 +                       };
 185 +               };
 186 +       };
 187 +
 188 +       fragment@11 {
 189 +               target = <&spi1>;
 190 +               __dormant__ {
 191 +                       status = "okay";
 192 +                       #address-cells = <1>;
 193 +                       #size-cells = <0>;
 194 +
 195 +                       mcp3008_11: mcp3008@1 {
 196 +                               compatible = "mcp3008";
 197 +                               reg = <1>;
 198 +                               spi-max-frequency = <1600000>;
 199 +                       };
 200 +               };
 201 +       };
 202 +
 203 +       fragment@12 {
 204 +               target = <&spi1>;
 205 +               __dormant__ {
 206 +                       status = "okay";
 207 +                       #address-cells = <1>;
 208 +                       #size-cells = <0>;
 209 +
 210 +                       mcp3008_12: mcp3008@2 {
 211 +                               compatible = "mcp3008";
 212 +                               reg = <2>;
 213 +                               spi-max-frequency = <1600000>;
 214 +                       };
 215 +               };
 216 +       };
 217 +
 218 +       fragment@13 {
 219 +               target = <&spi2>;
 220 +               __dormant__ {
 221 +                       status = "okay";
 222 +                       #address-cells = <1>;
 223 +                       #size-cells = <0>;
 224 +
 225 +                       mcp3008_20: mcp3008@0 {
 226 +                               compatible = "mcp3008";
 227 +                               reg = <0>;
 228 +                               spi-max-frequency = <1600000>;
 229 +                       };
 230 +               };
 231 +       };
 232 +
 233 +       fragment@14 {
 234 +               target = <&spi2>;
 235 +               __dormant__ {
 236 +                       status = "okay";
 237 +                       #address-cells = <1>;
 238 +                       #size-cells = <0>;
 239 +
 240 +                       mcp3008_21: mcp3008@1 {
 241 +                               compatible = "mcp3008";
 242 +                               reg = <1>;
 243 +                               spi-max-frequency = <1600000>;
 244 +                       };
 245 +               };
 246 +       };
 247 +
 248 +       fragment@15 {
 249 +               target = <&spi2>;
 250 +               __dormant__ {
 251 +                       status = "okay";
 252 +                       #address-cells = <1>;
 253 +                       #size-cells = <0>;
 254 +
 255 +                       mcp3008_22: mcp3008@2 {
 256 +                               compatible = "mcp3008";
 257 +                               reg = <2>;
 258 +                               spi-max-frequency = <1600000>;
 259 +                       };
 260 +               };
 261 +       };
 262 +
 263 +       __overrides__ {
 264 +               spi0-0-present = <0>, "+0+8";
 265 +               spi0-1-present = <0>, "+1+9";
 266 +               spi1-0-present = <0>, "+2+10";
 267 +               spi1-1-present = <0>, "+3+11";
 268 +               spi1-2-present = <0>, "+4+12";
 269 +               spi2-0-present = <0>, "+5+13";
 270 +               spi2-1-present = <0>, "+6+14";
 271 +               spi2-2-present = <0>, "+7+15";
 272 +               spi0-0-speed = <&mcp3008_00>, "spi-max-frequency:0";
 273 +               spi0-1-speed = <&mcp3008_01>, "spi-max-frequency:0";
 274 +               spi1-0-speed = <&mcp3008_10>, "spi-max-frequency:0";
 275 +               spi1-1-speed = <&mcp3008_11>, "spi-max-frequency:0";
 276 +               spi1-2-speed = <&mcp3008_12>, "spi-max-frequency:0";
 277 +               spi2-0-speed = <&mcp3008_20>, "spi-max-frequency:0";
 278 +               spi2-1-speed = <&mcp3008_21>, "spi-max-frequency:0";
 279 +               spi2-2-speed = <&mcp3008_22>, "spi-max-frequency:0";
 280 +       };
 281 +};