target/linux/brcm2708/patches-4.4/0576-Add-overlay-for-mcp3008-adc-1818.patch

   1 From f6a9afad8ed6521991c138caf7f20fd5222c2a5a 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 diff --git a/arch/arm/boot/dts/overlays/Makefile b/arch/arm/boot/dts/overlays/Makefile
  47 index 72f2d90a..b13e340 100644
  48 --- a/arch/arm/boot/dts/overlays/Makefile
  49 +++ b/arch/arm/boot/dts/overlays/Makefile
  50 @@ -57,6 +57,7 @@ dtbo-$(RPI_DT_OVERLAYS) += mcp23017.dtbo
  51  dtbo-$(RPI_DT_OVERLAYS) += mcp23s17.dtbo
  52  dtbo-$(RPI_DT_OVERLAYS) += mcp2515-can0.dtbo
  53  dtbo-$(RPI_DT_OVERLAYS) += mcp2515-can1.dtbo
  54 +dtbo-$(RPI_DT_OVERLAYS) += mcp3008.dtbo
  55  dtbo-$(RPI_DT_OVERLAYS) += mmc.dtbo
  56  dtbo-$(RPI_DT_OVERLAYS) += mz61581.dtbo
  57  dtbo-$(RPI_DT_OVERLAYS) += pi3-act-led.dtbo
  58 diff --git a/arch/arm/boot/dts/overlays/README b/arch/arm/boot/dts/overlays/README
  59 index 7f4bd29..72601f8 100644
  60 --- a/arch/arm/boot/dts/overlays/README
  61 +++ b/arch/arm/boot/dts/overlays/README
  62 @@ -736,6 +736,15 @@ Params: oscillator              Clock frequency for the CAN controller (Hz)
  63          interrupt               GPIO for interrupt signal
  64
  65
  66 +Name:   mcp3008
  67 +Info:   Configures MCP3008 A/D converters
  68 +        For devices on spi1 or spi2, the interfaces should be enabled
  69 +        with one of the spi1-1/2/3cs and/or spi2-1/2/3cs overlays.
  70 +Load:   dtoverlay=mcp3008,<param>[=<val>]
  71 +Params: spi<n>-<m>-present      boolean, configure device at spi<n>, cs<m>
  72 +        spi<n>-<m>-speed        integer, set the spi bus speed for this device
  73 +
  74 +
  75  Name:   mmc
  76  Info:   Selects the bcm2835-mmc SD/MMC driver, optionally with overclock
  77  Load:   dtoverlay=mmc,<param>=<val>
  78 diff --git a/arch/arm/boot/dts/overlays/mcp3008-overlay.dts b/arch/arm/boot/dts/overlays/mcp3008-overlay.dts
  79 new file mode 100755
  80 index 0000000..06bf426
  81 --- /dev/null
  82 +++ b/arch/arm/boot/dts/overlays/mcp3008-overlay.dts
  83 @@ -0,0 +1,205 @@
  84 +/*
  85 + * Device tree overlay for Microchip mcp3008 10-Bit A/D Converters
  86 + */
  87 +
  88 +/dts-v1/;
  89 +/plugin/;
  90 +
  91 +/ {
  92 +       compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
  93 +
  94 +       fragment@0 {
  95 +               target = <&spidev0>;
  96 +               __dormant__ {
  97 +                       status = "disabled";
  98 +               };
  99 +       };
 100 +
 101 +       fragment@1 {
 102 +               target = <&spidev1>;
 103 +               __dormant__ {
 104 +                       status = "disabled";
 105 +               };
 106 +       };
 107 +
 108 +       fragment@2 {
 109 +               target-path = "spi1/spidev@0";
 110 +               __dormant__ {
 111 +                       status = "disabled";
 112 +               };
 113 +       };
 114 +
 115 +       fragment@3 {
 116 +               target-path = "spi1/spidev@1";
 117 +               __dormant__ {
 118 +                       status = "disabled";
 119 +               };
 120 +       };
 121 +
 122 +       fragment@4 {
 123 +               target-path = "spi1/spidev@2";
 124 +               __dormant__ {
 125 +                       status = "disabled";
 126 +               };
 127 +       };
 128 +
 129 +       fragment@5 {
 130 +               target-path = "spi2/spidev@0";
 131 +               __dormant__ {
 132 +                       status = "disabled";
 133 +               };
 134 +       };
 135 +
 136 +       fragment@6 {
 137 +               target-path = "spi2/spidev@1";
 138 +               __dormant__ {
 139 +                       status = "disabled";
 140 +               };
 141 +       };
 142 +
 143 +       fragment@7 {
 144 +               target-path = "spi2/spidev@2";
 145 +               __dormant__ {
 146 +                       status = "disabled";
 147 +               };
 148 +       };
 149 +
 150 +       fragment@8 {
 151 +               target = <&spi0>;
 152 +               __dormant__ {
 153 +                       status = "okay";
 154 +                       #address-cells = <1>;
 155 +                       #size-cells = <0>;
 156 +
 157 +                       mcp3008_00: mcp3008@0 {
 158 +                               compatible = "mcp3008";
 159 +                               reg = <0>;
 160 +                               spi-max-frequency = <1600000>;
 161 +                       };
 162 +               };
 163 +       };
 164 +
 165 +       fragment@9 {
 166 +               target = <&spi0>;
 167 +               __dormant__ {
 168 +                       status = "okay";
 169 +                       #address-cells = <1>;
 170 +                       #size-cells = <0>;
 171 +
 172 +                       mcp3008_01: mcp3008@1 {
 173 +                               compatible = "mcp3008";
 174 +                               reg = <1>;
 175 +                               spi-max-frequency = <1600000>;
 176 +                       };
 177 +               };
 178 +       };
 179 +
 180 +       fragment@10 {
 181 +               target = <&spi1>;
 182 +               __dormant__ {
 183 +                       status = "okay";
 184 +                       #address-cells = <1>;
 185 +                       #size-cells = <0>;
 186 +
 187 +                       mcp3008_10: mcp3008@0 {
 188 +                               compatible = "mcp3008";
 189 +                               reg = <0>;
 190 +                               spi-max-frequency = <1600000>;
 191 +                       };
 192 +               };
 193 +       };
 194 +
 195 +       fragment@11 {
 196 +               target = <&spi1>;
 197 +               __dormant__ {
 198 +                       status = "okay";
 199 +                       #address-cells = <1>;
 200 +                       #size-cells = <0>;
 201 +
 202 +                       mcp3008_11: mcp3008@1 {
 203 +                               compatible = "mcp3008";
 204 +                               reg = <1>;
 205 +                               spi-max-frequency = <1600000>;
 206 +                       };
 207 +               };
 208 +       };
 209 +
 210 +       fragment@12 {
 211 +               target = <&spi1>;
 212 +               __dormant__ {
 213 +                       status = "okay";
 214 +                       #address-cells = <1>;
 215 +                       #size-cells = <0>;
 216 +
 217 +                       mcp3008_12: mcp3008@2 {
 218 +                               compatible = "mcp3008";
 219 +                               reg = <2>;
 220 +                               spi-max-frequency = <1600000>;
 221 +                       };
 222 +               };
 223 +       };
 224 +
 225 +       fragment@13 {
 226 +               target = <&spi2>;
 227 +               __dormant__ {
 228 +                       status = "okay";
 229 +                       #address-cells = <1>;
 230 +                       #size-cells = <0>;
 231 +
 232 +                       mcp3008_20: mcp3008@0 {
 233 +                               compatible = "mcp3008";
 234 +                               reg = <0>;
 235 +                               spi-max-frequency = <1600000>;
 236 +                       };
 237 +               };
 238 +       };
 239 +
 240 +       fragment@14 {
 241 +               target = <&spi2>;
 242 +               __dormant__ {
 243 +                       status = "okay";
 244 +                       #address-cells = <1>;
 245 +                       #size-cells = <0>;
 246 +
 247 +                       mcp3008_21: mcp3008@1 {
 248 +                               compatible = "mcp3008";
 249 +                               reg = <1>;
 250 +                               spi-max-frequency = <1600000>;
 251 +                       };
 252 +               };
 253 +       };
 254 +
 255 +       fragment@15 {
 256 +               target = <&spi2>;
 257 +               __dormant__ {
 258 +                       status = "okay";
 259 +                       #address-cells = <1>;
 260 +                       #size-cells = <0>;
 261 +
 262 +                       mcp3008_22: mcp3008@2 {
 263 +                               compatible = "mcp3008";
 264 +                               reg = <2>;
 265 +                               spi-max-frequency = <1600000>;
 266 +                       };
 267 +               };
 268 +       };
 269 +
 270 +       __overrides__ {
 271 +               spi0-0-present = <0>, "+0+8";
 272 +               spi0-1-present = <0>, "+1+9";
 273 +               spi1-0-present = <0>, "+2+10";
 274 +               spi1-1-present = <0>, "+3+11";
 275 +               spi1-2-present = <0>, "+4+12";
 276 +               spi2-0-present = <0>, "+5+13";
 277 +               spi2-1-present = <0>, "+6+14";
 278 +               spi2-2-present = <0>, "+7+15";
 279 +               spi0-0-speed = <&mcp3008_00>, "spi-max-frequency:0";
 280 +               spi0-1-speed = <&mcp3008_01>, "spi-max-frequency:0";
 281 +               spi1-0-speed = <&mcp3008_10>, "spi-max-frequency:0";
 282 +               spi1-1-speed = <&mcp3008_11>, "spi-max-frequency:0";
 283 +               spi1-2-speed = <&mcp3008_12>, "spi-max-frequency:0";
 284 +               spi2-0-speed = <&mcp3008_20>, "spi-max-frequency:0";
 285 +               spi2-1-speed = <&mcp3008_21>, "spi-max-frequency:0";
 286 +               spi2-2-speed = <&mcp3008_22>, "spi-max-frequency:0";
 287 +       };
 288 +};
 289 --
 290 2.1.4
 291