lib/fdtdec.c

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors.
   3  * See file CREDITS for list of people who contributed to this
   4  * project.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation; either version 2 of
   9  * the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  19  * MA 02111-1307 USA
  20  */
  21
  22 #include <common.h>
  23 #include <serial.h>
  24 #include <libfdt.h>
  25 #include <fdtdec.h>
  26
  27 #include <asm/gpio.h>
  28
  29 DECLARE_GLOBAL_DATA_PTR;
  30
  31 /*
  32  * Here are the type we know about. One day we might allow drivers to
  33  * register. For now we just put them here. The COMPAT macro allows us to
  34  * turn this into a sparse list later, and keeps the ID with the name.
  35  */
  36 #define COMPAT(id, name) name
  37 static const char * const compat_names[COMPAT_COUNT] = {
  38         COMPAT(UNKNOWN, "<none>"),
  39         COMPAT(NVIDIA_TEGRA20_USB, "nvidia,tegra20-ehci"),
  40         COMPAT(NVIDIA_TEGRA30_USB, "nvidia,tegra30-ehci"),
  41         COMPAT(NVIDIA_TEGRA114_USB, "nvidia,tegra114-ehci"),
  42         COMPAT(NVIDIA_TEGRA114_I2C, "nvidia,tegra114-i2c"),
  43         COMPAT(NVIDIA_TEGRA20_I2C, "nvidia,tegra20-i2c"),
  44         COMPAT(NVIDIA_TEGRA20_DVC, "nvidia,tegra20-i2c-dvc"),
  45         COMPAT(NVIDIA_TEGRA20_EMC, "nvidia,tegra20-emc"),
  46         COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"),
  47         COMPAT(NVIDIA_TEGRA20_KBC, "nvidia,tegra20-kbc"),
  48         COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"),
  49         COMPAT(NVIDIA_TEGRA20_PWM, "nvidia,tegra20-pwm"),
  50         COMPAT(NVIDIA_TEGRA20_DC, "nvidia,tegra20-dc"),
  51         COMPAT(NVIDIA_TEGRA30_SDMMC, "nvidia,tegra30-sdhci"),
  52         COMPAT(NVIDIA_TEGRA20_SDMMC, "nvidia,tegra20-sdhci"),
  53         COMPAT(NVIDIA_TEGRA20_SFLASH, "nvidia,tegra20-sflash"),
  54         COMPAT(NVIDIA_TEGRA20_SLINK, "nvidia,tegra20-slink"),
  55         COMPAT(NVIDIA_TEGRA114_SPI, "nvidia,tegra114-spi"),
  56         COMPAT(SMSC_LAN9215, "smsc,lan9215"),
  57         COMPAT(SAMSUNG_EXYNOS5_SROMC, "samsung,exynos-sromc"),
  58         COMPAT(SAMSUNG_S3C2440_I2C, "samsung,s3c2440-i2c"),
  59         COMPAT(SAMSUNG_EXYNOS5_SOUND, "samsung,exynos-sound"),
  60         COMPAT(WOLFSON_WM8994_CODEC, "wolfson,wm8994-codec"),
  61         COMPAT(SAMSUNG_EXYNOS_SPI, "samsung,exynos-spi"),
  62         COMPAT(GOOGLE_CROS_EC, "google,cros-ec"),
  63         COMPAT(GOOGLE_CROS_EC_KEYB, "google,cros-ec-keyb"),
  64         COMPAT(SAMSUNG_EXYNOS_EHCI, "samsung,exynos-ehci"),
  65         COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"),
  66         COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"),
  67         COMPAT(SAMSUNG_EXYNOS_FIMD, "samsung,exynos-fimd"),
  68         COMPAT(SAMSUNG_EXYNOS5_DP, "samsung,exynos5-dp"),
  69         COMPAT(SAMSUNG_EXYNOS5_DWMMC, "samsung,exynos5250-dwmmc"),
  70         COMPAT(SAMSUNG_EXYNOS_SERIAL, "samsung,exynos4210-uart"),
  71         COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"),
  72         COMPAT(GENERIC_SPI_FLASH, "spi-flash"),
  73         COMPAT(MAXIM_98095_CODEC, "maxim,max98095-codec"),
  74         COMPAT(INFINEON_SLB9635_TPM, "infineon,slb9635-tpm"),
  75         COMPAT(INFINEON_SLB9645_TPM, "infineon,slb9645-tpm"),
  76         COMPAT(SAMSUNG_EXYNOS5_I2C, "samsung,exynos5-hsi2c"),
  77 };
  78
  79 const char *fdtdec_get_compatible(enum fdt_compat_id id)
  80 {
  81         /* We allow reading of the 'unknown' ID for testing purposes */
  82         assert(id >= 0 && id < COMPAT_COUNT);
  83         return compat_names[id];
  84 }
  85
  86 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
  87                 const char *prop_name, fdt_size_t *sizep)
  88 {
  89         const fdt_addr_t *cell;
  90         int len;
  91
  92         debug("%s: %s: ", __func__, prop_name);
  93         cell = fdt_getprop(blob, node, prop_name, &len);
  94         if (cell && ((!sizep && len == sizeof(fdt_addr_t)) ||
  95                      len == sizeof(fdt_addr_t) * 2)) {
  96                 fdt_addr_t addr = fdt_addr_to_cpu(*cell);
  97                 if (sizep) {
  98                         const fdt_size_t *size;
  99
 100                         size = (fdt_size_t *)((char *)cell +
 101                                         sizeof(fdt_addr_t));
 102                         *sizep = fdt_size_to_cpu(*size);
 103                         debug("addr=%p, size=%p\n", (void *)addr,
 104                               (void *)*sizep);
 105                 } else {
 106                         debug("%p\n", (void *)addr);
 107                 }
 108                 return addr;
 109         }
 110         debug("(not found)\n");
 111         return FDT_ADDR_T_NONE;
 112 }
 113
 114 fdt_addr_t fdtdec_get_addr(const void *blob, int node,
 115                 const char *prop_name)
 116 {
 117         return fdtdec_get_addr_size(blob, node, prop_name, NULL);
 118 }
 119
 120 s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
 121                 s32 default_val)
 122 {
 123         const s32 *cell;
 124         int len;
 125
 126         debug("%s: %s: ", __func__, prop_name);
 127         cell = fdt_getprop(blob, node, prop_name, &len);
 128         if (cell && len >= sizeof(s32)) {
 129                 s32 val = fdt32_to_cpu(cell[0]);
 130
 131                 debug("%#x (%d)\n", val, val);
 132                 return val;
 133         }
 134         debug("(not found)\n");
 135         return default_val;
 136 }
 137
 138 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
 139                 uint64_t default_val)
 140 {
 141         const uint64_t *cell64;
 142         int length;
 143
 144         cell64 = fdt_getprop(blob, node, prop_name, &length);
 145         if (!cell64 || length < sizeof(*cell64))
 146                 return default_val;
 147
 148         return fdt64_to_cpu(*cell64);
 149 }
 150
 151 int fdtdec_get_is_enabled(const void *blob, int node)
 152 {
 153         const char *cell;
 154
 155         /*
 156          * It should say "okay", so only allow that. Some fdts use "ok" but
 157          * this is a bug. Please fix your device tree source file. See here
 158          * for discussion:
 159          *
 160          * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html
 161          */
 162         cell = fdt_getprop(blob, node, "status", NULL);
 163         if (cell)
 164                 return 0 == strcmp(cell, "okay");
 165         return 1;
 166 }
 167
 168 enum fdt_compat_id fdtdec_lookup(const void *blob, int node)
 169 {
 170         enum fdt_compat_id id;
 171
 172         /* Search our drivers */
 173         for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++)
 174                 if (0 == fdt_node_check_compatible(blob, node,
 175                                 compat_names[id]))
 176                         return id;
 177         return COMPAT_UNKNOWN;
 178 }
 179
 180 int fdtdec_next_compatible(const void *blob, int node,
 181                 enum fdt_compat_id id)
 182 {
 183         return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
 184 }
 185
 186 int fdtdec_next_compatible_subnode(const void *blob, int node,
 187                 enum fdt_compat_id id, int *depthp)
 188 {
 189         do {
 190                 node = fdt_next_node(blob, node, depthp);
 191         } while (*depthp > 1);
 192
 193         /* If this is a direct subnode, and compatible, return it */
 194         if (*depthp == 1 && 0 == fdt_node_check_compatible(
 195                                                 blob, node, compat_names[id]))
 196                 return node;
 197
 198         return -FDT_ERR_NOTFOUND;
 199 }
 200
 201 int fdtdec_next_alias(const void *blob, const char *name,
 202                 enum fdt_compat_id id, int *upto)
 203 {
 204 #define MAX_STR_LEN 20
 205         char str[MAX_STR_LEN + 20];
 206         int node, err;
 207
 208         /* snprintf() is not available */
 209         assert(strlen(name) < MAX_STR_LEN);
 210         sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto);
 211         node = fdt_path_offset(blob, str);
 212         if (node < 0)
 213                 return node;
 214         err = fdt_node_check_compatible(blob, node, compat_names[id]);
 215         if (err < 0)
 216                 return err;
 217         if (err)
 218                 return -FDT_ERR_NOTFOUND;
 219         (*upto)++;
 220         return node;
 221 }
 222
 223 int fdtdec_find_aliases_for_id(const void *blob, const char *name,
 224                         enum fdt_compat_id id, int *node_list, int maxcount)
 225 {
 226         memset(node_list, '\0', sizeof(*node_list) * maxcount);
 227
 228         return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount);
 229 }
 230
 231 /* TODO: Can we tighten this code up a little? */
 232 int fdtdec_add_aliases_for_id(const void *blob, const char *name,
 233                         enum fdt_compat_id id, int *node_list, int maxcount)
 234 {
 235         int name_len = strlen(name);
 236         int nodes[maxcount];
 237         int num_found = 0;
 238         int offset, node;
 239         int alias_node;
 240         int count;
 241         int i, j;
 242
 243         /* find the alias node if present */
 244         alias_node = fdt_path_offset(blob, "/aliases");
 245
 246         /*
 247          * start with nothing, and we can assume that the root node can't
 248          * match
 249          */
 250         memset(nodes, '\0', sizeof(nodes));
 251
 252         /* First find all the compatible nodes */
 253         for (node = count = 0; node >= 0 && count < maxcount;) {
 254                 node = fdtdec_next_compatible(blob, node, id);
 255                 if (node >= 0)
 256                         nodes[count++] = node;
 257         }
 258         if (node >= 0)
 259                 debug("%s: warning: maxcount exceeded with alias '%s'\n",
 260                        __func__, name);
 261
 262         /* Now find all the aliases */
 263         for (offset = fdt_first_property_offset(blob, alias_node);
 264                         offset > 0;
 265                         offset = fdt_next_property_offset(blob, offset)) {
 266                 const struct fdt_property *prop;
 267                 const char *path;
 268                 int number;
 269                 int found;
 270
 271                 node = 0;
 272                 prop = fdt_get_property_by_offset(blob, offset, NULL);
 273                 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
 274                 if (prop->len && 0 == strncmp(path, name, name_len))
 275                         node = fdt_path_offset(blob, prop->data);
 276                 if (node <= 0)
 277                         continue;
 278
 279                 /* Get the alias number */
 280                 number = simple_strtoul(path + name_len, NULL, 10);
 281                 if (number < 0 || number >= maxcount) {
 282                         debug("%s: warning: alias '%s' is out of range\n",
 283                                __func__, path);
 284                         continue;
 285                 }
 286
 287                 /* Make sure the node we found is actually in our list! */
 288                 found = -1;
 289                 for (j = 0; j < count; j++)
 290                         if (nodes[j] == node) {
 291                                 found = j;
 292                                 break;
 293                         }
 294
 295                 if (found == -1) {
 296                         debug("%s: warning: alias '%s' points to a node "
 297                                 "'%s' that is missing or is not compatible "
 298                                 " with '%s'\n", __func__, path,
 299                                 fdt_get_name(blob, node, NULL),
 300                                compat_names[id]);
 301                         continue;
 302                 }
 303
 304                 /*
 305                  * Add this node to our list in the right place, and mark
 306                  * it as done.
 307                  */
 308                 if (fdtdec_get_is_enabled(blob, node)) {
 309                         if (node_list[number]) {
 310                                 debug("%s: warning: alias '%s' requires that "
 311                                       "a node be placed in the list in a "
 312                                       "position which is already filled by "
 313                                       "node '%s'\n", __func__, path,
 314                                       fdt_get_name(blob, node, NULL));
 315                                 continue;
 316                         }
 317                         node_list[number] = node;
 318                         if (number >= num_found)
 319                                 num_found = number + 1;
 320                 }
 321                 nodes[found] = 0;
 322         }
 323
 324         /* Add any nodes not mentioned by an alias */
 325         for (i = j = 0; i < maxcount; i++) {
 326                 if (!node_list[i]) {
 327                         for (; j < maxcount; j++)
 328                                 if (nodes[j] &&
 329                                         fdtdec_get_is_enabled(blob, nodes[j]))
 330                                         break;
 331
 332                         /* Have we run out of nodes to add? */
 333                         if (j == maxcount)
 334                                 break;
 335
 336                         assert(!node_list[i]);
 337                         node_list[i] = nodes[j++];
 338                         if (i >= num_found)
 339                                 num_found = i + 1;
 340                 }
 341         }
 342
 343         return num_found;
 344 }
 345
 346 int fdtdec_check_fdt(void)
 347 {
 348         /*
 349          * We must have an FDT, but we cannot panic() yet since the console
 350          * is not ready. So for now, just assert(). Boards which need an early
 351          * FDT (prior to console ready) will need to make their own
 352          * arrangements and do their own checks.
 353          */
 354         assert(!fdtdec_prepare_fdt());
 355         return 0;
 356 }
 357
 358 /*
 359  * This function is a little odd in that it accesses global data. At some
 360  * point if the architecture board.c files merge this will make more sense.
 361  * Even now, it is common code.
 362  */
 363 int fdtdec_prepare_fdt(void)
 364 {
 365         if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) ||
 366             fdt_check_header(gd->fdt_blob)) {
 367                 printf("No valid FDT found - please append one to U-Boot "
 368                         "binary, use u-boot-dtb.bin or define "
 369                         "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n");
 370                 return -1;
 371         }
 372         return 0;
 373 }
 374
 375 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name)
 376 {
 377         const u32 *phandle;
 378         int lookup;
 379
 380         debug("%s: %s\n", __func__, prop_name);
 381         phandle = fdt_getprop(blob, node, prop_name, NULL);
 382         if (!phandle)
 383                 return -FDT_ERR_NOTFOUND;
 384
 385         lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle));
 386         return lookup;
 387 }
 388
 389 /**
 390  * Look up a property in a node and check that it has a minimum length.
 391  *
 392  * @param blob          FDT blob
 393  * @param node          node to examine
 394  * @param prop_name     name of property to find
 395  * @param min_len       minimum property length in bytes
 396  * @param err           0 if ok, or -FDT_ERR_NOTFOUND if the property is not
 397                         found, or -FDT_ERR_BADLAYOUT if not enough data
 398  * @return pointer to cell, which is only valid if err == 0
 399  */
 400 static const void *get_prop_check_min_len(const void *blob, int node,
 401                 const char *prop_name, int min_len, int *err)
 402 {
 403         const void *cell;
 404         int len;
 405
 406         debug("%s: %s\n", __func__, prop_name);
 407         cell = fdt_getprop(blob, node, prop_name, &len);
 408         if (!cell)
 409                 *err = -FDT_ERR_NOTFOUND;
 410         else if (len < min_len)
 411                 *err = -FDT_ERR_BADLAYOUT;
 412         else
 413                 *err = 0;
 414         return cell;
 415 }
 416
 417 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
 418                 u32 *array, int count)
 419 {
 420         const u32 *cell;
 421         int i, err = 0;
 422
 423         debug("%s: %s\n", __func__, prop_name);
 424         cell = get_prop_check_min_len(blob, node, prop_name,
 425                                       sizeof(u32) * count, &err);
 426         if (!err) {
 427                 for (i = 0; i < count; i++)
 428                         array[i] = fdt32_to_cpu(cell[i]);
 429         }
 430         return err;
 431 }
 432
 433 const u32 *fdtdec_locate_array(const void *blob, int node,
 434                                const char *prop_name, int count)
 435 {
 436         const u32 *cell;
 437         int err;
 438
 439         cell = get_prop_check_min_len(blob, node, prop_name,
 440                                       sizeof(u32) * count, &err);
 441         return err ? NULL : cell;
 442 }
 443
 444 int fdtdec_get_bool(const void *blob, int node, const char *prop_name)
 445 {
 446         const s32 *cell;
 447         int len;
 448
 449         debug("%s: %s\n", __func__, prop_name);
 450         cell = fdt_getprop(blob, node, prop_name, &len);
 451         return cell != NULL;
 452 }
 453
 454 /**
 455  * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no
 456  * terminating item.
 457  *
 458  * @param blob          FDT blob to use
 459  * @param node          Node to look at
 460  * @param prop_name     Node property name
 461  * @param gpio          Array of gpio elements to fill from FDT. This will be
 462  *                      untouched if either 0 or an error is returned
 463  * @param max_count     Maximum number of elements allowed
 464  * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would
 465  * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing.
 466  */
 467 int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name,
 468                 struct fdt_gpio_state *gpio, int max_count)
 469 {
 470         const struct fdt_property *prop;
 471         const u32 *cell;
 472         const char *name;
 473         int len, i;
 474
 475         debug("%s: %s\n", __func__, prop_name);
 476         assert(max_count > 0);
 477         prop = fdt_get_property(blob, node, prop_name, &len);
 478         if (!prop) {
 479                 debug("%s: property '%s' missing\n", __func__, prop_name);
 480                 return -FDT_ERR_NOTFOUND;
 481         }
 482
 483         /* We will use the name to tag the GPIO */
 484         name = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
 485         cell = (u32 *)prop->data;
 486         len /= sizeof(u32) * 3;         /* 3 cells per GPIO record */
 487         if (len > max_count) {
 488                 debug(" %s: too many GPIOs / cells for "
 489                         "property '%s'\n", __func__, prop_name);
 490                 return -FDT_ERR_BADLAYOUT;
 491         }
 492
 493         /* Read out the GPIO data from the cells */
 494         for (i = 0; i < len; i++, cell += 3) {
 495                 gpio[i].gpio = fdt32_to_cpu(cell[1]);
 496                 gpio[i].flags = fdt32_to_cpu(cell[2]);
 497                 gpio[i].name = name;
 498         }
 499
 500         return len;
 501 }
 502
 503 int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
 504                 struct fdt_gpio_state *gpio)
 505 {
 506         int err;
 507
 508         debug("%s: %s\n", __func__, prop_name);
 509         gpio->gpio = FDT_GPIO_NONE;
 510         gpio->name = NULL;
 511         err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1);
 512         return err == 1 ? 0 : err;
 513 }
 514
 515 int fdtdec_get_gpio(struct fdt_gpio_state *gpio)
 516 {
 517         int val;
 518
 519         if (!fdt_gpio_isvalid(gpio))
 520                 return -1;
 521
 522         val = gpio_get_value(gpio->gpio);
 523         return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
 524 }
 525
 526 int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val)
 527 {
 528         if (!fdt_gpio_isvalid(gpio))
 529                 return -1;
 530
 531         val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
 532         return gpio_set_value(gpio->gpio, val);
 533 }
 534
 535 int fdtdec_setup_gpio(struct fdt_gpio_state *gpio)
 536 {
 537         /*
 538          * Return success if there is no GPIO defined. This is used for
 539          * optional GPIOs)
 540          */
 541         if (!fdt_gpio_isvalid(gpio))
 542                 return 0;
 543
 544         if (gpio_request(gpio->gpio, gpio->name))
 545                 return -1;
 546         return 0;
 547 }
 548
 549 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
 550                 u8 *array, int count)
 551 {
 552         const u8 *cell;
 553         int err;
 554
 555         cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
 556         if (!err)
 557                 memcpy(array, cell, count);
 558         return err;
 559 }
 560
 561 const u8 *fdtdec_locate_byte_array(const void *blob, int node,
 562                              const char *prop_name, int count)
 563 {
 564         const u8 *cell;
 565         int err;
 566
 567         cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
 568         if (err)
 569                 return NULL;
 570         return cell;
 571 }
 572
 573 int fdtdec_get_config_int(const void *blob, const char *prop_name,
 574                 int default_val)
 575 {
 576         int config_node;
 577
 578         debug("%s: %s\n", __func__, prop_name);
 579         config_node = fdt_path_offset(blob, "/config");
 580         if (config_node < 0)
 581                 return default_val;
 582         return fdtdec_get_int(blob, config_node, prop_name, default_val);
 583 }
 584
 585 int fdtdec_get_config_bool(const void *blob, const char *prop_name)
 586 {
 587         int config_node;
 588         const void *prop;
 589
 590         debug("%s: %s\n", __func__, prop_name);
 591         config_node = fdt_path_offset(blob, "/config");
 592         if (config_node < 0)
 593                 return 0;
 594         prop = fdt_get_property(blob, config_node, prop_name, NULL);
 595
 596         return prop != NULL;
 597 }
 598
 599 char *fdtdec_get_config_string(const void *blob, const char *prop_name)
 600 {
 601         const char *nodep;
 602         int nodeoffset;
 603         int len;
 604
 605         debug("%s: %s\n", __func__, prop_name);
 606         nodeoffset = fdt_path_offset(blob, "/config");
 607         if (nodeoffset < 0)
 608                 return NULL;
 609
 610         nodep = fdt_getprop(blob, nodeoffset, prop_name, &len);
 611         if (!nodep)
 612                 return NULL;
 613
 614         return (char *)nodep;
 615 }
 616
 617 int fdtdec_decode_region(const void *blob, int node,
 618                 const char *prop_name, void **ptrp, size_t *size)
 619 {
 620         const fdt_addr_t *cell;
 621         int len;
 622
 623         debug("%s: %s\n", __func__, prop_name);
 624         cell = fdt_getprop(blob, node, prop_name, &len);
 625         if (!cell || (len != sizeof(fdt_addr_t) * 2))
 626                 return -1;
 627
 628         *ptrp = (void *)fdt_addr_to_cpu(*cell);
 629         *size = fdt_size_to_cpu(cell[1]);
 630         debug("%s: size=%zx\n", __func__, *size);
 631         return 0;
 632 }