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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Device tree for LEGO MINDSTORMS EV3
   4  *
   5  * Copyright (C) 2017 David Lechner <david@lechnology.com>
   6  */
   7
   8 /dts-v1/;
   9 #include <dt-bindings/gpio/gpio.h>
  10 #include <dt-bindings/input/linux-event-codes.h>
  11 #include <dt-bindings/pwm/pwm.h>
  12
  13 #include "da850.dtsi"
  14
  15 / {
  16         compatible = "lego,ev3", "ti,da850";
  17         model = "LEGO MINDSTORMS EV3";
  18
  19         aliases {
  20                 serial1 = &serial1;
  21         };
  22
  23         memory@c0000000 {
  24                 device_type = "memory";
  25                 reg = <0xc0000000 0x04000000>;
  26         };
  27
  28         /*
  29          * The buttons on the EV3 are mapped to keyboard keys.
  30          */
  31         gpio_keys {
  32                 compatible = "gpio-keys";
  33                 label = "EV3 Brick Buttons";
  34                 pinctrl-names = "default";
  35                 pinctrl-0 = <&button_bias>;
  36
  37                 center {
  38                         label = "Center";
  39                         linux,code = <KEY_ENTER>;
  40                         gpios = <&gpio 29 GPIO_ACTIVE_HIGH>;
  41                 };
  42
  43                 left {
  44                         label = "Left";
  45                         linux,code = <KEY_LEFT>;
  46                         gpios = <&gpio 102 GPIO_ACTIVE_HIGH>;
  47                 };
  48
  49                 back {
  50                         label = "Back";
  51                         linux,code = <KEY_BACKSPACE>;
  52                         gpios = <&gpio 106 GPIO_ACTIVE_HIGH>;
  53                 };
  54
  55                 right {
  56                         label = "Right";
  57                         linux,code = <KEY_RIGHT>;
  58                         gpios = <&gpio 124 GPIO_ACTIVE_HIGH>;
  59                 };
  60
  61                 down {
  62                         label = "Down";
  63                         linux,code = <KEY_DOWN>;
  64                         gpios = <&gpio 126 GPIO_ACTIVE_HIGH>;
  65                 };
  66
  67                 up {
  68                         label = "Up";
  69                         linux,code = <KEY_UP>;
  70                         gpios = <&gpio 127 GPIO_ACTIVE_HIGH>;
  71                 };
  72         };
  73
  74         /*
  75          * The EV3 has two built-in bi-color LEDs behind the buttons.
  76          */
  77         leds {
  78                 compatible = "gpio-leds";
  79
  80                 left_green {
  81                         label = "led0:green:brick-status";
  82                         /* GP6[13] */
  83                         gpios = <&gpio 103 GPIO_ACTIVE_HIGH>;
  84                         linux,default-trigger = "default-on";
  85                 };
  86
  87                 right_red {
  88                         label = "led1:red:brick-status";
  89                         /* GP6[7] */
  90                         gpios = <&gpio 108 GPIO_ACTIVE_HIGH>;
  91                         linux,default-trigger = "default-on";
  92                 };
  93
  94                 left_red {
  95                         label = "led0:red:brick-status";
  96                         /* GP6[12] */
  97                         gpios = <&gpio 109 GPIO_ACTIVE_HIGH>;
  98                         linux,default-trigger = "default-on";
  99                 };
 100
 101                 right_green {
 102                         label = "led1:green:brick-status";
 103                         /* GP6[14] */
 104                         gpios = <&gpio 110 GPIO_ACTIVE_HIGH>;
 105                         linux,default-trigger = "default-on";
 106                 };
 107         };
 108
 109         /*
 110          * The EV3 is powered down by turning off the main 5V supply.
 111          */
 112         gpio-poweroff {
 113                 compatible = "gpio-poweroff";
 114                 gpios = <&gpio 107 GPIO_ACTIVE_LOW>;
 115         };
 116
 117         sound {
 118                 compatible = "pwm-beeper";
 119                 pinctrl-names = "default";
 120                 pinctrl-0 = <&ehrpwm0b_pins>;
 121                 pwms = <&ehrpwm0 1 1000000 0>;
 122                 amp-supply = <&amp>;
 123         };
 124
 125         cvdd: regulator0 {
 126                 compatible = "regulator-fixed";
 127                 regulator-name = "cvdd";
 128                 regulator-min-microvolt = <1200000>;
 129                 regulator-max-microvolt = <1200000>;
 130                 regulator-always-on;
 131                 regulator-boot-on;
 132         };
 133
 134         /*
 135          * This is a 5V current limiting regulator that is shared by USB,
 136          * the sensor (input) ports, the motor (output) ports and the A/DC.
 137          */
 138         vcc5v: regulator1 {
 139                 compatible = "regulator-fixed";
 140                 regulator-name = "vcc5v";
 141                 regulator-min-microvolt = <5000000>;
 142                 regulator-max-microvolt = <5000000>;
 143                 gpio = <&gpio 101 0>;
 144                 over-current-gpios = <&gpio 99 GPIO_ACTIVE_LOW>;
 145                 enable-active-high;
 146                 regulator-boot-on;
 147         };
 148
 149         /*
 150          * This is a simple voltage divider on VCC5V to provide a 2.5V
 151          * reference signal to the ADC.
 152          */
 153         adc_ref: regulator2 {
 154                 compatible = "regulator-fixed";
 155                 regulator-name = "adc ref";
 156                 regulator-min-microvolt = <2500000>;
 157                 regulator-max-microvolt = <2500000>;
 158                 regulator-boot-on;
 159                 vin-supply = <&vcc5v>;
 160         };
 161
 162         /*
 163          * This is the amplifier for the speaker.
 164          */
 165         amp: regulator3 {
 166                 compatible = "regulator-fixed";
 167                 regulator-name = "amp";
 168                 gpio = <&gpio 111 GPIO_ACTIVE_HIGH>;
 169                 enable-active-high;
 170         };
 171
 172         /*
 173          * The EV3 can use 6-AA batteries or a rechargeable Li-ion battery pack.
 174          */
 175         battery {
 176                 compatible = "lego,ev3-battery";
 177                 io-channels = <&adc 4>, <&adc 3>;
 178                 io-channel-names = "voltage", "current";
 179                 rechargeable-gpios = <&gpio 136 GPIO_ACTIVE_LOW>;
 180         };
 181
 182         bt_slow_clk: bt-clock {
 183                 pinctrl-names = "default";
 184                 pinctrl-0 = <&ecap2_pins>, <&bt_clock_bias>;
 185                 compatible = "pwm-clock";
 186                 #clock-cells = <0>;
 187                 clock-frequency = <32768>;
 188                 pwms = <&ecap2 0 30518 0>;
 189         };
 190
 191         /* ARM local RAM */
 192         memory@ffff0000 {
 193                 compatible = "syscon", "simple-mfd";
 194                 reg = <0xffff0000 0x2000>; /* 8k */
 195
 196                 /*
 197                  * The I2C bootloader looks for this magic value to either
 198                  * boot normally or boot into a firmware update mode.
 199                  */
 200                 reboot-mode {
 201                         compatible = "syscon-reboot-mode";
 202                         offset = <0x1ffc>;
 203                         mode-normal = <0x00000000>;
 204                         mode-loader = <0x5555aaaa>;
 205                 };
 206         };
 207 };
 208
 209 &ref_clk {
 210         clock-frequency = <24000000>;
 211 };
 212
 213 &cpu {
 214         cpu-supply = <&cvdd>;
 215 };
 216
 217 /* since we have a fixed regulator, we can't run at these points */
 218 &opp_100 {
 219         status = "disabled";
 220 };
 221
 222 &opp_200 {
 223         status = "disabled";
 224 };
 225
 226 /*
 227  * The SoC is actually the 456MHz version, but because of the fixed regulator
 228  * This is the fastest we can go.
 229  */
 230 &opp_375 {
 231         status = "okay";
 232 };
 233
 234 &pmx_core {
 235         status = "okay";
 236
 237         ev3_lcd_pins: pinmux_lcd {
 238                 pinctrl-single,bits = <
 239                         /* SIMO, CLK */
 240                         0x14 0x00100100 0x00f00f00
 241                 >;
 242         };
 243 };
 244
 245 &pinconf {
 246         status = "okay";
 247
 248         /* Buttons have external pulldown resistors */
 249         button_bias: button-bias-groups {
 250                 disable {
 251                         groups = "cp5", "cp24", "cp25", "cp28";
 252                         bias-disable;
 253                 };
 254         };
 255
 256         bt_clock_bias: bt-clock-bias-groups {
 257                 disable {
 258                         groups = "cp2";
 259                         bias-disable;
 260                 };
 261         };
 262
 263         bt_pic_bias: bt-pic-bias-groups {
 264                 disable {
 265                         groups = "cp20";
 266                         bias-disable;
 267                 };
 268         };
 269 };
 270
 271 /* Input port 1 */
 272 &serial1 {
 273         status = "okay";
 274         pinctrl-names = "default";
 275         pinctrl-0 = <&serial1_rxtx_pins>;
 276 };
 277
 278 &serial2 {
 279         pinctrl-names = "default";
 280         pinctrl-0 = <&serial2_rxtx_pins>, <&serial2_rtscts_pins>, <&bt_pic_bias>;
 281         status = "okay";
 282
 283         bluetooth {
 284                 compatible = "ti,cc2560";
 285                 clocks = <&bt_slow_clk>;
 286                 clock-names = "ext_clock";
 287                 enable-gpios = <&gpio 73 GPIO_ACTIVE_HIGH>;
 288                 max-speed = <2000000>;
 289                 nvmem-cells = <&bdaddr>;
 290                 nvmem-cell-names = "bd-address";
 291         };
 292 };
 293
 294 &rtc0 {
 295         status = "okay";
 296 };
 297
 298 &i2c0 {
 299         status = "okay";
 300         clock-frequency = <400000>;
 301         pinctrl-names = "default";
 302         pinctrl-0 = <&i2c0_pins>;
 303
 304         /*
 305          * EEPROM contains the first stage bootloader, HW ID and Bluetooth MAC.
 306          */
 307         eeprom@50 {
 308                 compatible = "microchip,24c128", "atmel,24c128";
 309                 pagesize = <64>;
 310                 read-only;
 311                 reg = <0x50>;
 312                 #address-cells = <1>;
 313                 #size-cells = <1>;
 314
 315                 bdaddr: bdaddr@3f06 {
 316                         reg = <0x3f06 0x06>;
 317                 };
 318         };
 319 };
 320
 321 &wdt {
 322         status = "okay";
 323 };
 324
 325 &mmc0 {
 326         status = "okay";
 327         max-frequency = <50000000>;
 328         bus-width = <4>;
 329         cd-gpios = <&gpio 94 GPIO_ACTIVE_LOW>;
 330         pinctrl-names = "default";
 331         pinctrl-0 = <&mmc0_pins>;
 332 };
 333
 334 &spi0 {
 335         status = "okay";
 336         pinctrl-names = "default";
 337         pinctrl-0 = <&spi0_pins>, <&spi0_cs0_pin>, <&spi0_cs3_pin>;
 338
 339         flash@0 {
 340                 compatible = "n25q128a13", "jedec,spi-nor";
 341                 reg = <0>;
 342                 spi-max-frequency = <50000000>;
 343                 ti,spi-wdelay = <8>;
 344
 345                 /* Partitions are based on the official firmware from LEGO */
 346                 partitions {
 347                         compatible = "fixed-partitions";
 348                         #address-cells = <1>;
 349                         #size-cells = <1>;
 350
 351                         partition@0 {
 352                                 label = "U-Boot";
 353                                 reg = <0 0x40000>;
 354                         };
 355
 356                         partition@40000 {
 357                                 label = "U-Boot Env";
 358                                 reg = <0x40000 0x10000>;
 359                         };
 360
 361                         partition@50000 {
 362                                 label = "Kernel";
 363                                 reg = <0x50000 0x200000>;
 364                         };
 365
 366                         partition@250000 {
 367                                 label = "Filesystem";
 368                                 reg = <0x250000 0xa50000>;
 369                         };
 370
 371                         partition@cb0000 {
 372                                 label = "Storage";
 373                                 reg = <0xcb0000 0x2f0000>;
 374                         };
 375                 };
 376         };
 377
 378         adc: adc@3 {
 379                 compatible = "ti,ads7957";
 380                 reg = <3>;
 381                 #io-channel-cells = <1>;
 382                 spi-max-frequency = <1000000>;
 383                 ti,spi-wdelay = <63>;
 384                 vref-supply = <&adc_ref>;
 385         };
 386 };
 387
 388 &spi1 {
 389         status = "okay";
 390         pinctrl-0 = <&ev3_lcd_pins>;
 391         pinctrl-names = "default";
 392         cs-gpios = <&gpio 44 GPIO_ACTIVE_LOW>;
 393
 394         display@0{
 395                 compatible = "lego,ev3-lcd";
 396                 reg = <0>;
 397                 spi-max-frequency = <10000000>;
 398                 a0-gpios = <&gpio 43 GPIO_ACTIVE_HIGH>;
 399                 reset-gpios = <&gpio 80 GPIO_ACTIVE_HIGH>;
 400         };
 401 };
 402
 403 &ecap2 {
 404         status = "okay";
 405 };
 406
 407 &ehrpwm0 {
 408         status = "okay";
 409 };
 410
 411 &gpio {
 412         status = "okay";
 413
 414         /* Don't pull down battery voltage adc io channel */
 415         batt_volt_en {
 416                 gpio-hog;
 417                 gpios = <6 GPIO_ACTIVE_HIGH>;
 418                 output-high;
 419         };
 420
 421         /* Don't impede Bluetooth clock signal */
 422         bt_clock_en {
 423                 gpio-hog;
 424                 gpios = <5 GPIO_ACTIVE_HIGH>;
 425                 input;
 426         };
 427
 428         /*
 429          * There is a PIC microcontroller for interfacing with an Apple MFi
 430          * chip. This interferes with normal Bluetooth operation, so we need
 431          * to make sure it is turned off. Note: The publicly available
 432          * schematics from LEGO don't show that these pins are connected to
 433          * anything, but they are present in the source code from LEGO.
 434          */
 435
 436         bt_pic_en {
 437                 gpio-hog;
 438                 gpios = <51 GPIO_ACTIVE_HIGH>;
 439                 output-low;
 440         };
 441
 442         bt_pic_rst {
 443                 gpio-hog;
 444                 gpios = <78 GPIO_ACTIVE_HIGH>;
 445                 output-high;
 446         };
 447
 448         bt_pic_cts {
 449                 gpio-hog;
 450                 gpios = <87 GPIO_ACTIVE_HIGH>;
 451                 input;
 452         };
 453 };
 454
 455 &usb_phy {
 456         status = "okay";
 457 };
 458
 459 &usb0 {
 460         status = "okay";
 461 };
 462
 463 &usb1 {
 464         status = "okay";
 465         vbus-supply = <&vcc5v>;
 466 };