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         /*
 126          * This is a 5V current limiting regulator that is shared by USB,
 127          * the sensor (input) ports, the motor (output) ports and the A/DC.
 128          */
 129         vcc5v: regulator1 {
 130                 compatible = "regulator-fixed";
 131                 regulator-name = "vcc5v";
 132                 regulator-min-microvolt = <5000000>;
 133                 regulator-max-microvolt = <5000000>;
 134                 gpio = <&gpio 101 0>;
 135                 over-current-gpios = <&gpio 99 GPIO_ACTIVE_LOW>;
 136                 enable-active-high;
 137                 regulator-boot-on;
 138         };
 139
 140         /*
 141          * This is a simple voltage divider on VCC5V to provide a 2.5V
 142          * reference signal to the ADC.
 143          */
 144         adc_ref: regulator2 {
 145                 compatible = "regulator-fixed";
 146                 regulator-name = "adc ref";
 147                 regulator-min-microvolt = <2500000>;
 148                 regulator-max-microvolt = <2500000>;
 149                 regulator-boot-on;
 150                 vin-supply = <&vcc5v>;
 151         };
 152
 153         /*
 154          * This is the amplifier for the speaker.
 155          */
 156         amp: regulator3 {
 157                 compatible = "regulator-fixed";
 158                 regulator-name = "amp";
 159                 gpio = <&gpio 111 GPIO_ACTIVE_HIGH>;
 160                 enable-active-high;
 161         };
 162
 163         /*
 164          * The EV3 can use 6-AA batteries or a rechargeable Li-ion battery pack.
 165          */
 166         battery {
 167                 compatible = "lego,ev3-battery";
 168                 io-channels = <&adc 4>, <&adc 3>;
 169                 io-channel-names = "voltage", "current";
 170                 rechargeable-gpios = <&gpio 136 GPIO_ACTIVE_LOW>;
 171         };
 172
 173         bt_slow_clk: bt-clock {
 174                 pinctrl-names = "default";
 175                 pinctrl-0 = <&ecap2_pins>, <&bt_clock_bias>;
 176                 compatible = "pwm-clock";
 177                 #clock-cells = <0>;
 178                 clock-frequency = <32768>;
 179                 pwms = <&ecap2 0 30518 0>;
 180         };
 181
 182         /* ARM local RAM */
 183         memory@ffff0000 {
 184                 compatible = "syscon", "simple-mfd";
 185                 reg = <0xffff0000 0x2000>; /* 8k */
 186
 187                 /*
 188                  * The I2C bootloader looks for this magic value to either
 189                  * boot normally or boot into a firmware update mode.
 190                  */
 191                 reboot-mode {
 192                         compatible = "syscon-reboot-mode";
 193                         offset = <0x1ffc>;
 194                         mode-normal = <0x00000000>;
 195                         mode-loader = <0x5555aaaa>;
 196                 };
 197         };
 198 };
 199
 200 &ref_clk {
 201         clock-frequency = <24000000>;
 202 };
 203
 204 &pmx_core {
 205         status = "okay";
 206
 207         ev3_lcd_pins: pinmux_lcd {
 208                 pinctrl-single,bits = <
 209                         /* SIMO, CLK */
 210                         0x14 0x00100100 0x00f00f00
 211                 >;
 212         };
 213 };
 214
 215 &pinconf {
 216         status = "okay";
 217
 218         /* Buttons have external pulldown resistors */
 219         button_bias: button-bias-groups {
 220                 disable {
 221                         groups = "cp5", "cp24", "cp25", "cp28";
 222                         bias-disable;
 223                 };
 224         };
 225
 226         bt_clock_bias: bt-clock-bias-groups {
 227                 disable {
 228                         groups = "cp2";
 229                         bias-disable;
 230                 };
 231         };
 232
 233         bt_pic_bias: bt-pic-bias-groups {
 234                 disable {
 235                         groups = "cp20";
 236                         bias-disable;
 237                 };
 238         };
 239 };
 240
 241 /* Input port 1 */
 242 &serial1 {
 243         status = "okay";
 244         pinctrl-names = "default";
 245         pinctrl-0 = <&serial1_rxtx_pins>;
 246 };
 247
 248 &serial2 {
 249         pinctrl-names = "default";
 250         pinctrl-0 = <&serial2_rxtx_pins>, <&serial2_rtscts_pins>, <&bt_pic_bias>;
 251         status = "okay";
 252
 253         bluetooth {
 254                 compatible = "ti,cc2560";
 255                 clocks = <&bt_slow_clk>;
 256                 clock-names = "ext_clock";
 257                 enable-gpios = <&gpio 73 GPIO_ACTIVE_HIGH>;
 258                 max-speed = <2000000>;
 259                 nvmem-cells = <&bdaddr>;
 260                 nvmem-cell-names = "bd-address";
 261         };
 262 };
 263
 264 &rtc0 {
 265         status = "okay";
 266 };
 267
 268 &i2c0 {
 269         status = "okay";
 270         clock-frequency = <400000>;
 271         pinctrl-names = "default";
 272         pinctrl-0 = <&i2c0_pins>;
 273
 274         /*
 275          * EEPROM contains the first stage bootloader, HW ID and Bluetooth MAC.
 276          */
 277         eeprom@50 {
 278                 compatible = "microchip,24c128", "atmel,24c128";
 279                 pagesize = <64>;
 280                 read-only;
 281                 reg = <0x50>;
 282                 #address-cells = <1>;
 283                 #size-cells = <1>;
 284
 285                 bdaddr: bdaddr@3f06 {
 286                         reg = <0x3f06 0x06>;
 287                 };
 288         };
 289 };
 290
 291 &wdt {
 292         status = "okay";
 293 };
 294
 295 &mmc0 {
 296         status = "okay";
 297         max-frequency = <50000000>;
 298         bus-width = <4>;
 299         cd-gpios = <&gpio 94 GPIO_ACTIVE_LOW>;
 300         pinctrl-names = "default";
 301         pinctrl-0 = <&mmc0_pins>;
 302 };
 303
 304 &spi0 {
 305         status = "okay";
 306         pinctrl-names = "default";
 307         pinctrl-0 = <&spi0_pins>, <&spi0_cs0_pin>, <&spi0_cs3_pin>;
 308
 309         flash@0 {
 310                 compatible = "n25q128a13", "jedec,spi-nor";
 311                 reg = <0>;
 312                 spi-max-frequency = <50000000>;
 313                 ti,spi-wdelay = <8>;
 314
 315                 /* Partitions are based on the official firmware from LEGO */
 316                 partitions {
 317                         compatible = "fixed-partitions";
 318                         #address-cells = <1>;
 319                         #size-cells = <1>;
 320
 321                         partition@0 {
 322                                 label = "U-Boot";
 323                                 reg = <0 0x40000>;
 324                         };
 325
 326                         partition@40000 {
 327                                 label = "U-Boot Env";
 328                                 reg = <0x40000 0x10000>;
 329                         };
 330
 331                         partition@50000 {
 332                                 label = "Kernel";
 333                                 reg = <0x50000 0x200000>;
 334                         };
 335
 336                         partition@250000 {
 337                                 label = "Filesystem";
 338                                 reg = <0x250000 0xa50000>;
 339                         };
 340
 341                         partition@cb0000 {
 342                                 label = "Storage";
 343                                 reg = <0xcb0000 0x2f0000>;
 344                         };
 345                 };
 346         };
 347
 348         adc: adc@3 {
 349                 compatible = "ti,ads7957";
 350                 reg = <3>;
 351                 #io-channel-cells = <1>;
 352                 spi-max-frequency = <1000000>;
 353                 ti,spi-wdelay = <63>;
 354                 vref-supply = <&adc_ref>;
 355         };
 356 };
 357
 358 &spi1 {
 359         status = "okay";
 360         pinctrl-0 = <&ev3_lcd_pins>;
 361         pinctrl-names = "default";
 362         cs-gpios = <&gpio 44 GPIO_ACTIVE_LOW>;
 363
 364         display@0{
 365                 compatible = "lego,ev3-lcd";
 366                 reg = <0>;
 367                 spi-max-frequency = <10000000>;
 368                 a0-gpios = <&gpio 43 GPIO_ACTIVE_HIGH>;
 369                 reset-gpios = <&gpio 80 GPIO_ACTIVE_HIGH>;
 370         };
 371 };
 372
 373 &ecap2 {
 374         status = "okay";
 375 };
 376
 377 &ehrpwm0 {
 378         status = "okay";
 379 };
 380
 381 &gpio {
 382         status = "okay";
 383
 384         /* Don't pull down battery voltage adc io channel */
 385         batt_volt_en {
 386                 gpio-hog;
 387                 gpios = <6 GPIO_ACTIVE_HIGH>;
 388                 output-high;
 389         };
 390
 391         /* Don't impede Bluetooth clock signal */
 392         bt_clock_en {
 393                 gpio-hog;
 394                 gpios = <5 GPIO_ACTIVE_HIGH>;
 395                 input;
 396         };
 397
 398         /*
 399          * There is a PIC microcontroller for interfacing with an Apple MFi
 400          * chip. This interferes with normal Bluetooth operation, so we need
 401          * to make sure it is turned off. Note: The publicly available
 402          * schematics from LEGO don't show that these pins are connected to
 403          * anything, but they are present in the source code from LEGO.
 404          */
 405
 406         bt_pic_en {
 407                 gpio-hog;
 408                 gpios = <51 GPIO_ACTIVE_HIGH>;
 409                 output-low;
 410         };
 411
 412         bt_pic_rst {
 413                 gpio-hog;
 414                 gpios = <78 GPIO_ACTIVE_HIGH>;
 415                 output-high;
 416         };
 417
 418         bt_pic_cts {
 419                 gpio-hog;
 420                 gpios = <87 GPIO_ACTIVE_HIGH>;
 421                 input;
 422         };
 423 };
 424
 425 &usb_phy {
 426         status = "okay";
 427 };
 428
 429 &usb0 {
 430         status = "okay";
 431 };
 432
 433 &usb1 {
 434         status = "okay";
 435         vbus-supply = <&vcc5v>;
 436 };