arch/arm/boot/dts/da850-lego-ev3.dts

   1 /*
   2  * Device tree for LEGO MINDSTORMS EV3
   3  *
   4  * Copyright (C) 2017 David Lechner <david@lechnology.com>
   5  *
   6  * This program is free software; you can redistribute  it and/or modify it
   7  * under  the terms of  the GNU General  Public License as published by the
   8  * Free Software Foundation, version 2.
   9  */
  10
  11 /dts-v1/;
  12 #include <dt-bindings/gpio/gpio.h>
  13 #include <dt-bindings/input/linux-event-codes.h>
  14 #include <dt-bindings/pwm/pwm.h>
  15
  16 #include "da850.dtsi"
  17
  18 / {
  19         compatible = "lego,ev3", "ti,da850";
  20         model = "LEGO MINDSTORMS EV3";
  21
  22         aliases {
  23                 serial1 = &serial1;
  24         };
  25
  26         memory@c0000000 {
  27                 device_type = "memory";
  28                 reg = <0xc0000000 0x04000000>;
  29         };
  30
  31         /*
  32          * The buttons on the EV3 are mapped to keyboard keys.
  33          */
  34         gpio_keys {
  35                 compatible = "gpio-keys";
  36                 label = "EV3 Brick Buttons";
  37                 pinctrl-names = "default";
  38                 pinctrl-0 = <&button_bias>;
  39
  40                 center {
  41                         label = "Center";
  42                         linux,code = <KEY_ENTER>;
  43                         gpios = <&gpio 29 GPIO_ACTIVE_HIGH>;
  44                 };
  45
  46                 left {
  47                         label = "Left";
  48                         linux,code = <KEY_LEFT>;
  49                         gpios = <&gpio 102 GPIO_ACTIVE_HIGH>;
  50                 };
  51
  52                 back {
  53                         label = "Back";
  54                         linux,code = <KEY_BACKSPACE>;
  55                         gpios = <&gpio 106 GPIO_ACTIVE_HIGH>;
  56                 };
  57
  58                 right {
  59                         label = "Right";
  60                         linux,code = <KEY_RIGHT>;
  61                         gpios = <&gpio 124 GPIO_ACTIVE_HIGH>;
  62                 };
  63
  64                 down {
  65                         label = "Down";
  66                         linux,code = <KEY_DOWN>;
  67                         gpios = <&gpio 126 GPIO_ACTIVE_HIGH>;
  68                 };
  69
  70                 up {
  71                         label = "Up";
  72                         linux,code = <KEY_UP>;
  73                         gpios = <&gpio 127 GPIO_ACTIVE_HIGH>;
  74                 };
  75         };
  76
  77         /*
  78          * The EV3 has two built-in bi-color LEDs behind the buttons.
  79          */
  80         leds {
  81                 compatible = "gpio-leds";
  82
  83                 left_green {
  84                         label = "led0:green:brick-status";
  85                         /* GP6[13] */
  86                         gpios = <&gpio 103 GPIO_ACTIVE_HIGH>;
  87                         linux,default-trigger = "default-on";
  88                 };
  89
  90                 right_red {
  91                         label = "led1:red:brick-status";
  92                         /* GP6[7] */
  93                         gpios = <&gpio 108 GPIO_ACTIVE_HIGH>;
  94                         linux,default-trigger = "default-on";
  95                 };
  96
  97                 left_red {
  98                         label = "led0:red:brick-status";
  99                         /* GP6[12] */
 100                         gpios = <&gpio 109 GPIO_ACTIVE_HIGH>;
 101                         linux,default-trigger = "default-on";
 102                 };
 103
 104                 right_green {
 105                         label = "led1:green:brick-status";
 106                         /* GP6[14] */
 107                         gpios = <&gpio 110 GPIO_ACTIVE_HIGH>;
 108                         linux,default-trigger = "default-on";
 109                 };
 110         };
 111
 112         /*
 113          * The EV3 is powered down by turning off the main 5V supply.
 114          */
 115         gpio-poweroff {
 116                 compatible = "gpio-poweroff";
 117                 gpios = <&gpio 107 GPIO_ACTIVE_LOW>;
 118         };
 119
 120         sound {
 121                 compatible = "pwm-beeper";
 122                 pinctrl-names = "default";
 123                 pinctrl-0 = <&ehrpwm0b_pins>;
 124                 pwms = <&ehrpwm0 1 1000000 0>;
 125                 amp-supply = <&amp>;
 126         };
 127
 128         /*
 129          * This is a 5V current limiting regulator that is shared by USB,
 130          * the sensor (input) ports, the motor (output) ports and the A/DC.
 131          */
 132         vcc5v: regulator1 {
 133                 compatible = "regulator-fixed";
 134                 regulator-name = "vcc5v";
 135                 regulator-min-microvolt = <5000000>;
 136                 regulator-max-microvolt = <5000000>;
 137                 gpio = <&gpio 101 0>;
 138                 over-current-gpios = <&gpio 99 GPIO_ACTIVE_LOW>;
 139                 enable-active-high;
 140                 regulator-boot-on;
 141         };
 142
 143         /*
 144          * This is a simple voltage divider on VCC5V to provide a 2.5V
 145          * reference signal to the ADC.
 146          */
 147         adc_ref: regulator2 {
 148                 compatible = "regulator-fixed";
 149                 regulator-name = "adc ref";
 150                 regulator-min-microvolt = <2500000>;
 151                 regulator-max-microvolt = <2500000>;
 152                 regulator-boot-on;
 153                 vin-supply = <&vcc5v>;
 154         };
 155
 156         /*
 157          * This is the amplifier for the speaker.
 158          */
 159         amp: regulator3 {
 160                 compatible = "regulator-fixed";
 161                 regulator-name = "amp";
 162                 gpio = <&gpio 111 GPIO_ACTIVE_HIGH>;
 163                 enable-active-high;
 164         };
 165
 166         /*
 167          * The EV3 can use 6-AA batteries or a rechargeable Li-ion battery pack.
 168          */
 169         battery {
 170                 compatible = "lego,ev3-battery";
 171                 io-channels = <&adc 4>, <&adc 3>;
 172                 io-channel-names = "voltage", "current";
 173                 rechargeable-gpios = <&gpio 136 GPIO_ACTIVE_LOW>;
 174         };
 175
 176         bt_slow_clk: bt-clock {
 177                 pinctrl-names = "default";
 178                 pinctrl-0 = <&ecap2_pins>, <&bt_clock_bias>;
 179                 compatible = "pwm-clock";
 180                 #clock-cells = <0>;
 181                 clock-frequency = <32768>;
 182                 pwms = <&ecap2 0 30518 0>;
 183         };
 184
 185         /* ARM local RAM */
 186         memory@ffff0000 {
 187                 compatible = "syscon", "simple-mfd";
 188                 reg = <0xffff0000 0x2000>; /* 8k */
 189
 190                 /*
 191                  * The I2C bootloader looks for this magic value to either
 192                  * boot normally or boot into a firmware update mode.
 193                  */
 194                 reboot-mode {
 195                         compatible = "syscon-reboot-mode";
 196                         offset = <0x1ffc>;
 197                         mode-normal = <0x00000000>;
 198                         mode-loader = <0x5555aaaa>;
 199                 };
 200         };
 201 };
 202
 203 &ref_clk {
 204         clock-frequency = <24000000>;
 205 };
 206
 207 &pmx_core {
 208         status = "okay";
 209
 210         ev3_lcd_pins: pinmux_lcd {
 211                 pinctrl-single,bits = <
 212                         /* SIMO, CLK */
 213                         0x14 0x00100100 0x00f00f00
 214                 >;
 215         };
 216 };
 217
 218 &pinconf {
 219         status = "okay";
 220
 221         /* Buttons have external pulldown resistors */
 222         button_bias: button-bias-groups {
 223                 disable {
 224                         groups = "cp5", "cp24", "cp25", "cp28";
 225                         bias-disable;
 226                 };
 227         };
 228
 229         bt_clock_bias: bt-clock-bias-groups {
 230                 disable {
 231                         groups = "cp2";
 232                         bias-disable;
 233                 };
 234         };
 235
 236         bt_pic_bias: bt-pic-bias-groups {
 237                 disable {
 238                         groups = "cp20";
 239                         bias-disable;
 240                 };
 241         };
 242 };
 243
 244 /* Input port 1 */
 245 &serial1 {
 246         status = "okay";
 247         pinctrl-names = "default";
 248         pinctrl-0 = <&serial1_rxtx_pins>;
 249 };
 250
 251 &serial2 {
 252         pinctrl-names = "default";
 253         pinctrl-0 = <&serial2_rxtx_pins>, <&serial2_rtscts_pins>, <&bt_pic_bias>;
 254         status = "okay";
 255
 256         bluetooth {
 257                 compatible = "ti,cc2560";
 258                 clocks = <&bt_slow_clk>;
 259                 clock-names = "ext_clock";
 260                 enable-gpios = <&gpio 73 GPIO_ACTIVE_HIGH>;
 261                 max-speed = <2000000>;
 262                 nvmem-cells = <&bdaddr>;
 263                 nvmem-cell-names = "bd-address";
 264         };
 265 };
 266
 267 &rtc0 {
 268         status = "okay";
 269 };
 270
 271 &i2c0 {
 272         status = "okay";
 273         clock-frequency = <400000>;
 274         pinctrl-names = "default";
 275         pinctrl-0 = <&i2c0_pins>;
 276
 277         /*
 278          * EEPROM contains the first stage bootloader, HW ID and Bluetooth MAC.
 279          */
 280         eeprom@50 {
 281                 compatible = "microchip,24c128", "atmel,24c128";
 282                 pagesize = <64>;
 283                 read-only;
 284                 reg = <0x50>;
 285                 #address-cells = <1>;
 286                 #size-cells = <1>;
 287
 288                 bdaddr: bdaddr@3f06 {
 289                         reg = <0x3f06 0x06>;
 290                 };
 291         };
 292 };
 293
 294 &wdt {
 295         status = "okay";
 296 };
 297
 298 &mmc0 {
 299         status = "okay";
 300         max-frequency = <50000000>;
 301         bus-width = <4>;
 302         cd-gpios = <&gpio 94 GPIO_ACTIVE_LOW>;
 303         pinctrl-names = "default";
 304         pinctrl-0 = <&mmc0_pins>;
 305 };
 306
 307 &spi0 {
 308         status = "okay";
 309         pinctrl-names = "default";
 310         pinctrl-0 = <&spi0_pins>, <&spi0_cs0_pin>, <&spi0_cs3_pin>;
 311
 312         flash@0 {
 313                 compatible = "n25q128a13", "jedec,spi-nor";
 314                 reg = <0>;
 315                 spi-max-frequency = <50000000>;
 316                 ti,spi-wdelay = <8>;
 317
 318                 /* Partitions are based on the official firmware from LEGO */
 319                 partitions {
 320                         compatible = "fixed-partitions";
 321                         #address-cells = <1>;
 322                         #size-cells = <1>;
 323
 324                         partition@0 {
 325                                 label = "U-Boot";
 326                                 reg = <0 0x40000>;
 327                         };
 328
 329                         partition@40000 {
 330                                 label = "U-Boot Env";
 331                                 reg = <0x40000 0x10000>;
 332                         };
 333
 334                         partition@50000 {
 335                                 label = "Kernel";
 336                                 reg = <0x50000 0x200000>;
 337                         };
 338
 339                         partition@250000 {
 340                                 label = "Filesystem";
 341                                 reg = <0x250000 0xa50000>;
 342                         };
 343
 344                         partition@cb0000 {
 345                                 label = "Storage";
 346                                 reg = <0xcb0000 0x2f0000>;
 347                         };
 348                 };
 349         };
 350
 351         adc: adc@3 {
 352                 compatible = "ti,ads7957";
 353                 reg = <3>;
 354                 #io-channel-cells = <1>;
 355                 spi-max-frequency = <10000000>;
 356                 vref-supply = <&adc_ref>;
 357         };
 358 };
 359
 360 &spi1 {
 361         status = "okay";
 362         pinctrl-0 = <&ev3_lcd_pins>;
 363         pinctrl-names = "default";
 364         cs-gpios = <&gpio 44 GPIO_ACTIVE_LOW>;
 365
 366         display@0{
 367                 compatible = "lego,ev3-lcd";
 368                 reg = <0>;
 369                 spi-max-frequency = <10000000>;
 370                 a0-gpios = <&gpio 43 GPIO_ACTIVE_HIGH>;
 371                 reset-gpios = <&gpio 80 GPIO_ACTIVE_HIGH>;
 372         };
 373 };
 374
 375 &ecap2 {
 376         status = "okay";
 377 };
 378
 379 &ehrpwm0 {
 380         status = "okay";
 381 };
 382
 383 &gpio {
 384         status = "okay";
 385
 386         /* Don't pull down battery voltage adc io channel */
 387         batt_volt_en {
 388                 gpio-hog;
 389                 gpios = <6 GPIO_ACTIVE_HIGH>;
 390                 output-high;
 391         };
 392
 393         /* Don't impede Bluetooth clock signal */
 394         bt_clock_en {
 395                 gpio-hog;
 396                 gpios = <5 GPIO_ACTIVE_HIGH>;
 397                 input;
 398         };
 399
 400         /*
 401          * There is a PIC microcontroller for interfacing with an Apple MFi
 402          * chip. This interferes with normal Bluetooth operation, so we need
 403          * to make sure it is turned off. Note: The publicly available
 404          * schematics from LEGO don't show that these pins are connected to
 405          * anything, but they are present in the source code from LEGO.
 406          */
 407
 408         bt_pic_en {
 409                 gpio-hog;
 410                 gpios = <51 GPIO_ACTIVE_HIGH>;
 411                 output-low;
 412         };
 413
 414         bt_pic_rst {
 415                 gpio-hog;
 416                 gpios = <78 GPIO_ACTIVE_HIGH>;
 417                 output-high;
 418         };
 419
 420         bt_pic_cts {
 421                 gpio-hog;
 422                 gpios = <87 GPIO_ACTIVE_HIGH>;
 423                 input;
 424         };
 425 };
 426
 427 &usb_phy {
 428         status = "okay";
 429 };
 430
 431 &usb0 {
 432         status = "okay";
 433 };
 434
 435 &usb1 {
 436         status = "okay";
 437         vbus-supply = <&vcc5v>;
 438 };