board/karo/common/fdt.c

   1 /*
   2  * (C) Copyright 2012,2013 Lothar Waßmann <LW@KARO-electronics.de>
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * version 2 as published by the Free Software Foundation.
  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 */
  17
  18 #include <common.h>
  19 #include <errno.h>
  20 #include <libfdt.h>
  21 #include <fdt_support.h>
  22 #include <nand.h>
  23 #include <mxcfb.h>
  24 #include <linux/list.h>
  25 #include <linux/fb.h>
  26 #include <jffs2/load_kernel.h>
  27 #include <malloc.h>
  28
  29 #include "karo.h"
  30
  31 #ifdef CONFIG_MAX_DTB_SIZE
  32 #define MAX_DTB_SIZE    CONFIG_MAX_DTB_SIZE
  33 #else
  34 #define MAX_DTB_SIZE    SZ_64K
  35 #endif
  36
  37 DECLARE_GLOBAL_DATA_PTR;
  38
  39 static void karo_set_fdtsize(void *fdt)
  40 {
  41         size_t fdtsize = getenv_ulong("fdtsize", 16, 0);
  42
  43         if (fdtsize == fdt_totalsize(fdt)) {
  44                 return;
  45         }
  46         debug("FDT size changed from %u to %u\n",
  47                 fdtsize, fdt_totalsize(fdt));
  48         setenv_hex("fdtsize", fdt_totalsize(fdt));
  49 }
  50
  51 static void *karo_fdt_load_dtb(void)
  52 {
  53         int ret;
  54         void *fdt = (void *)getenv_ulong("fdtaddr", 16, CONFIG_SYS_FDT_ADDR);
  55
  56         if (had_ctrlc()) {
  57                 printf("aborting DTB load\n");
  58                 return NULL;
  59         }
  60
  61         /* clear FDT header in memory */
  62         memset(fdt, 0, 4);
  63
  64         ret = karo_load_part("dtb", fdt, MAX_DTB_SIZE);
  65         if (ret) {
  66                 printf("Failed to load dtb from flash: %d\n", ret);
  67                 return NULL;
  68         }
  69
  70         if (fdt_check_header(fdt)) {
  71                 debug("No valid DTB in flash\n");
  72                 return NULL;
  73         }
  74         debug("Using DTB from flash\n");
  75         karo_set_fdtsize(fdt);
  76         return fdt;
  77 }
  78
  79 void karo_fdt_move_fdt(void)
  80 {
  81         void *fdt;
  82         unsigned long fdt_addr = getenv_ulong("fdtaddr", 16, 0);
  83
  84         if (working_fdt) {
  85                 debug("DTB already loaded\n");
  86                 return;
  87         }
  88
  89         setenv("fdtsize", 0);
  90
  91         if (!fdt_addr) {
  92                 fdt_addr = CONFIG_SYS_FDT_ADDR;
  93                 printf("fdtaddr is not set; using default: %08lx\n",
  94                         fdt_addr);
  95         }
  96
  97         fdt = karo_fdt_load_dtb();
  98         if (fdt == NULL) {
  99                 fdt = (void *)gd->fdt_blob;
 100                 if (fdt == NULL) {
 101 #ifdef CONFIG_OF_EMBED
 102                         printf("Compiled in FDT not found");
 103 #else
 104                         printf("No FDT found");
 105 #endif
 106                         printf("; creating empty DTB\n");
 107                         fdt = (void *)fdt_addr;
 108                         fdt_create_empty_tree(fdt, 256);
 109                 } else {
 110                         printf("No DTB in flash; using default DTB\n");
 111                 }
 112                 debug("Checking FDT header @ %p\n", fdt);
 113                 if (fdt_check_header(fdt)) {
 114                         printf("ERROR: No valid DTB found at %p\n", fdt);
 115                         return;
 116                 }
 117                 debug("Moving FDT from %p..%p to %08lx..%08lx\n",
 118                         fdt, fdt + fdt_totalsize(fdt) - 1,
 119                         fdt_addr, fdt_addr + fdt_totalsize(fdt) - 1);
 120                 memmove((void *)fdt_addr, fdt, fdt_totalsize(fdt));
 121         }
 122         set_working_fdt_addr((void *)fdt_addr);
 123         gd->fdt_blob = fdt;
 124         karo_set_fdtsize(fdt);
 125 }
 126
 127 void karo_fdt_remove_node(void *blob, const char *node)
 128 {
 129         int off = fdt_path_offset(blob, node);
 130         int ret;
 131
 132         debug("Removing node '%s' from DT\n", node);
 133
 134         if (off < 0) {
 135                 printf("Could not find node '%s': %s\n", node,
 136                         fdt_strerror(off));
 137         } else {
 138                 ret = fdt_del_node(blob, off);
 139                 if (ret)
 140                         printf("Failed to remove node '%s': %s\n",
 141                                 node, fdt_strerror(ret));
 142         }
 143         karo_set_fdtsize(blob);
 144 }
 145
 146 void karo_fdt_enable_node(void *blob, const char *node, int enable)
 147 {
 148         int off = fdt_path_offset(blob, node);
 149
 150         debug("%sabling node '%s'\n", enable ? "En" : "Dis", node);
 151         if (off < 0) {
 152                 printf("Could not find node '%s': %s\n", node,
 153                         fdt_strerror(off));
 154                 return;
 155         }
 156         fdt_set_node_status(blob, off,
 157                         enable ? FDT_STATUS_OKAY : FDT_STATUS_DISABLED, 0);
 158
 159         karo_set_fdtsize(blob);
 160 }
 161
 162 static void fdt_disable_tp_node(void *blob, const char *name)
 163 {
 164         int offs = fdt_node_offset_by_compatible(blob, -1, name);
 165
 166         while (offs >= 0) {
 167                 debug("Disabling node '%s'\n", name);
 168                 fdt_set_node_status(blob, offs, FDT_STATUS_DISABLED, 0);
 169                 offs = fdt_node_offset_by_compatible(blob, offs, name);
 170         }
 171 }
 172
 173 void karo_fdt_fixup_touchpanel(void *blob, const char *panels[],
 174                         size_t num_panels)
 175 {
 176         int i;
 177         const char *model = getenv("touchpanel");
 178
 179         for (i = 0; i < num_panels; i++) {
 180                 const char *tp = panels[i];
 181
 182                 if (model != NULL) {
 183                         if (strcmp(model, tp) == 0)
 184                                 continue;
 185                         while (tp != NULL) {
 186                                 if (*tp != '\0' && strcmp(model, tp + 1) == 0)
 187                                         break;
 188                                 tp = strpbrk(tp + 1, ",-");
 189                         }
 190                         if (tp != NULL)
 191                                 continue;
 192                 }
 193                 fdt_disable_tp_node(blob, panels[i]);
 194         }
 195         karo_set_fdtsize(blob);
 196 }
 197
 198 static int karo_fdt_disable_node_phandle(void *blob, const char *parent,
 199                                         const char *name)
 200 {
 201         const uint32_t *ph;
 202         int off;
 203
 204         off = fdt_path_offset(blob, parent);
 205         if (off < 0) {
 206                 printf("Failed to find node '%s'\n", parent);
 207                 return off;
 208         }
 209
 210         ph = fdt_getprop(blob, off, name, NULL);
 211         if (ph == NULL) {
 212                 printf("Failed to find '%s' phandle in node '%s'\n", name,
 213                         fdt_get_name(blob, off, NULL));
 214                 return -FDT_ERR_NOTFOUND;
 215         }
 216
 217         off = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*ph));
 218         if (off <= 0) {
 219                 printf("Failed to find '%s' node via phandle %04x\n",
 220                         name, fdt32_to_cpu(*ph));
 221                 return -FDT_ERR_NOTFOUND;
 222         }
 223         return fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 224 }
 225
 226 void karo_fdt_fixup_usb_otg(void *blob, const char *node, const char *phy)
 227 {
 228         const char *otg_mode = getenv("otg_mode");
 229         int off;
 230         int ret;
 231         int disable_otg = 0;
 232         int disable_phy_pins = 1;
 233
 234         debug("OTG mode is '%s'\n", otg_mode ? otg_mode : "<UNSET>");
 235
 236         off = fdt_path_offset(blob, node);
 237         if (off < 0) {
 238                 debug("Failed to find node %s\n", node);
 239                 return;
 240         }
 241
 242         if (otg_mode && (strcmp(otg_mode, "device") == 0 ||
 243                                 strcmp(otg_mode, "gadget") == 0)) {
 244                 debug("Setting dr_mode to 'peripheral'\n");
 245                 ret = fdt_setprop_string(blob, off, "dr_mode", "peripheral");
 246         } else if (otg_mode && strcmp(otg_mode, "host") == 0) {
 247                 debug("Setting dr_mode to 'host'\n");
 248                 ret = fdt_setprop_string(blob, off, "dr_mode", "host");
 249                 disable_phy_pins = 0;
 250         } else if (otg_mode && strcmp(otg_mode, "otg") == 0) {
 251                 debug("Setting dr_mode to 'host'\n");
 252                 ret = fdt_setprop_string(blob, off, "dr_mode", "otg");
 253         } else {
 254                 if (otg_mode && strcmp(otg_mode, "none") != 0)
 255                         printf("Invalid 'otg_mode' setting '%s'; disabling usbotg port\n",
 256                                 otg_mode);
 257                 disable_otg = 1;
 258                 ret = 0;
 259         }
 260
 261         if ((!disable_phy_pins && !disable_otg) || ret)
 262                 goto out;
 263
 264         ret = karo_fdt_disable_node_phandle(blob, node, "vbus-supply");
 265         if (ret)
 266                 goto out;
 267
 268         if (disable_otg) {
 269                 debug("Disabling usbphy\n");
 270                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 271                 if (ret)
 272                         goto out;
 273
 274                 ret = karo_fdt_disable_node_phandle(blob, node, phy);
 275         }
 276 out:
 277         if (ret)
 278                 printf("Failed to update usbotg: %s\n", fdt_strerror(ret));
 279         else
 280                 debug("node '%s' updated\n", node);
 281         karo_set_fdtsize(blob);
 282 }
 283
 284 static inline int karo_fdt_flexcan_enabled(void *blob)
 285 {
 286         static const char *can_ifs[] = {
 287                 "can0",
 288                 "can1",
 289         };
 290         size_t i;
 291
 292         for (i = 0; i < ARRAY_SIZE(can_ifs); i++) {
 293                 const char *status;
 294                 int off = fdt_path_offset(blob, can_ifs[i]);
 295
 296                 if (off < 0) {
 297                         debug("node '%s' not found\n", can_ifs[i]);
 298                         continue;
 299                 }
 300                 status = fdt_getprop(blob, off, "status", NULL);
 301                 if (status && strcmp(status, "okay") == 0) {
 302                         debug("%s is enabled\n", can_ifs[i]);
 303                         return 1;
 304                 }
 305         }
 306         debug("can driver is disabled\n");
 307         return 0;
 308 }
 309
 310 static inline void karo_fdt_set_lcd_pins(void *blob, const char *name)
 311 {
 312         int off = fdt_path_offset(blob, name);
 313         u32 ph;
 314         const struct fdt_property *pc;
 315         int len;
 316
 317         if (off < 0)
 318                 return;
 319
 320         ph = fdt_create_phandle(blob, off);
 321         if (!ph)
 322                 return;
 323
 324         off = fdt_path_offset(blob, "display");
 325         if (off < 0)
 326                 return;
 327
 328         pc = fdt_get_property(blob, off, "pinctrl-0", &len);
 329         if (!pc || len < sizeof(ph))
 330                 return;
 331
 332         memcpy((void *)pc->data, &ph, sizeof(ph));
 333         fdt_setprop_cell(blob, off, "pinctrl-0", ph);
 334 }
 335
 336 void karo_fdt_fixup_flexcan(void *blob, int xcvr_present)
 337 {
 338         int ret;
 339         const char *xcvr_status = xcvr_present ? "disabled" : NULL;
 340         const char *otg_mode = getenv("otg_mode");
 341
 342 #ifndef CONFIG_SYS_LVDS_IF
 343         if (xcvr_present) {
 344                 if (karo_fdt_flexcan_enabled(blob)) {
 345                         karo_fdt_set_lcd_pins(blob, "lcdif_23bit_pins_a");
 346                         xcvr_status = NULL;
 347                 } else {
 348                         karo_fdt_set_lcd_pins(blob, "lcdif_24bit_pins_a");
 349                 }
 350         } else {
 351                 karo_fdt_set_lcd_pins(blob, "lcdif_24bit_pins_a");
 352         }
 353 #endif
 354         if (otg_mode && strcmp(otg_mode, "host") == 0)
 355                 karo_fdt_enable_node(blob, "can1", 0);
 356
 357         if (xcvr_status) {
 358                 debug("Disabling CAN XCVR\n");
 359                 ret = fdt_find_and_setprop(blob, "reg_can_xcvr", "status",
 360                                         xcvr_status, strlen(xcvr_status) + 1, 1);
 361                 if (ret)
 362                         printf("Failed to disable CAN transceiver switch: %s\n",
 363                                 fdt_strerror(ret));
 364         }
 365 }
 366
 367 void karo_fdt_del_prop(void *blob, const char *compat, phys_addr_t offs,
 368                         const char *prop)
 369 {
 370         int ret;
 371         int offset;
 372         const uint32_t *phandle;
 373         uint32_t ph = 0;
 374
 375         offset = fdt_node_offset_by_compat_reg(blob, compat, offs);
 376         if (offset <= 0)
 377                 return;
 378
 379         phandle = fdt_getprop(blob, offset, prop, NULL);
 380         if (phandle) {
 381                 ph = fdt32_to_cpu(*phandle);
 382         }
 383
 384         debug("Removing property '%s' from node %s@%08lx\n", prop, compat, offs);
 385         ret = fdt_delprop(blob, offset, prop);
 386         if (ret == 0)
 387                 karo_set_fdtsize(blob);
 388
 389         if (!ph)
 390                 return;
 391
 392         offset = fdt_node_offset_by_phandle(blob, ph);
 393         if (offset <= 0)
 394                 return;
 395
 396         debug("Removing node @ %08x\n", offset);
 397         fdt_del_node(blob, offset);
 398         karo_set_fdtsize(blob);
 399 }
 400
 401 static int fdt_init_fb_mode(const void *blob, int off, struct fb_videomode *fb_mode)
 402 {
 403         const uint32_t *prop;
 404
 405         memset(fb_mode, 0, sizeof(*fb_mode));
 406
 407         prop = fdt_getprop(blob, off, "clock-frequency", NULL);
 408         if (prop)
 409                 fb_mode->pixclock = KHZ2PICOS(fdt32_to_cpu(*prop) / 1000);
 410
 411         prop = fdt_getprop(blob, off, "hactive", NULL);
 412         if (prop)
 413                 fb_mode->xres = fdt32_to_cpu(*prop);
 414
 415         prop = fdt_getprop(blob, off, "vactive", NULL);
 416         if (prop)
 417                 fb_mode->yres = fdt32_to_cpu(*prop);
 418
 419         prop = fdt_getprop(blob, off, "hback-porch", NULL);
 420         if (prop)
 421                 fb_mode->left_margin = fdt32_to_cpu(*prop);
 422
 423         prop = fdt_getprop(blob, off, "hsync-len", NULL);
 424         if (prop)
 425                 fb_mode->hsync_len = fdt32_to_cpu(*prop);
 426
 427         prop = fdt_getprop(blob, off, "hfront-porch", NULL);
 428         if (prop)
 429                 fb_mode->right_margin = fdt32_to_cpu(*prop);
 430
 431         prop = fdt_getprop(blob, off, "vback-porch", NULL);
 432         if (prop)
 433                 fb_mode->upper_margin = fdt32_to_cpu(*prop);
 434
 435         prop = fdt_getprop(blob, off, "vsync-len", NULL);
 436         if (prop)
 437                 fb_mode->vsync_len = fdt32_to_cpu(*prop);
 438
 439         prop = fdt_getprop(blob, off, "vfront-porch", NULL);
 440         if (prop)
 441                 fb_mode->lower_margin = fdt32_to_cpu(*prop);
 442
 443         prop = fdt_getprop(blob, off, "hsync-active", NULL);
 444         if (prop)
 445                 fb_mode->sync |= *prop ? FB_SYNC_VERT_HIGH_ACT : 0;
 446
 447         prop = fdt_getprop(blob, off, "vsync-active", NULL);
 448         if (prop)
 449                 fb_mode->sync |= *prop ? FB_SYNC_VERT_HIGH_ACT : 0;
 450
 451         prop = fdt_getprop(blob, off, "de-active", NULL);
 452         if (prop)
 453                 fb_mode->sync |= *prop ? 0 : FB_SYNC_OE_LOW_ACT;
 454
 455         prop = fdt_getprop(blob, off, "pixelclk-active", NULL);
 456         if (prop)
 457                 fb_mode->sync |= *prop ? 0 : FB_SYNC_CLK_LAT_FALL;
 458
 459         return 0;
 460 }
 461
 462 static int fdt_update_native_fb_mode(void *blob, int off)
 463 {
 464         int ret;
 465         uint32_t ph;
 466
 467         ret = fdt_increase_size(blob, 64);
 468         if (ret) {
 469                 printf("Warning: Failed to increase FDT size: %s\n",
 470                         fdt_strerror(ret));
 471         }
 472         debug("Creating phandle at offset %d\n", off);
 473         ph = fdt_create_phandle(blob, off);
 474         if (!ph) {
 475                 printf("Failed to create phandle for video timing\n");
 476                 return -ENOMEM;
 477         }
 478
 479         debug("phandle of %s @ %06x=%04x\n", fdt_get_name(blob, off, NULL),
 480                 off, ph);
 481         off = fdt_parent_offset(blob, off);
 482         if (off < 0)
 483                 return off;
 484         debug("parent offset=%06x\n", off);
 485         ret = fdt_setprop_cell(blob, off, "native-mode", ph);
 486         if (ret)
 487                 printf("Failed to set property 'native-mode': %s\n",
 488                         fdt_strerror(ret));
 489         karo_set_fdtsize(blob);
 490         return ret;
 491 }
 492
 493 static int karo_fdt_find_video_timings(void *blob)
 494 {
 495         int off = fdt_path_offset(blob, "display");
 496         const char *subnode = "display-timings";
 497
 498         if (off < 0) {
 499                 debug("Could not find node 'display' in FDT: %s\n",
 500                         fdt_strerror(off));
 501                 return off;
 502         }
 503
 504         off = fdt_subnode_offset(blob, off, subnode);
 505         if (off < 0) {
 506                 debug("Could not find node '%s' in FDT: %s\n", subnode,
 507                         fdt_strerror(off));
 508         }
 509         return off;
 510 }
 511
 512 int karo_fdt_get_fb_mode(void *blob, const char *name, struct fb_videomode *fb_mode)
 513 {
 514         int off = karo_fdt_find_video_timings(blob);
 515
 516         if (off < 0)
 517                 return off;
 518         while (off > 0) {
 519                 const char *n, *endp;
 520                 int len, d = 1;
 521
 522                 off = fdt_next_node(blob, off, &d);
 523                 if (off < 0)
 524                         return off;
 525                 if (d < 1)
 526                         return -EINVAL;
 527                 if (d > 2) {
 528                         debug("Skipping node @ %04x %s depth %d\n", off,
 529                                 fdt_get_name(blob, off, NULL), d);
 530                         continue;
 531                 }
 532                 debug("parsing subnode @ %04x %s depth %d\n", off,
 533                         fdt_get_name(blob, off, NULL), d);
 534
 535                 n = fdt_getprop(blob, off, "panel-name", &len);
 536                 if (!n) {
 537                         n = fdt_get_name(blob, off, NULL);
 538                         if (strcasecmp(n, name) == 0) {
 539                                 break;
 540                         }
 541                 } else {
 542                         int found = 0;
 543
 544                         for (endp = n + len; n < endp; n += strlen(n) + 1) {
 545                                 debug("Checking panel-name '%s'\n", n);
 546                                 if (strcasecmp(n, name) == 0) {
 547                                         debug("Using node %s @ %04x\n",
 548                                                 fdt_get_name(blob, off, NULL), off);
 549                                         found = 1;
 550                                         break;
 551                                 }
 552                         }
 553                         if (found)
 554                                 break;
 555                 }
 556         }
 557         if (off > 0) {
 558                 return fdt_init_fb_mode(blob, off, fb_mode);
 559         }
 560         return -EINVAL;
 561 }
 562
 563 #define SET_FB_PROP(n, v) ({                                            \
 564         int ret;                                                        \
 565         ret = fdt_setprop_u32(blob, off, n, v);                         \
 566         if (ret) {                                                      \
 567                 printf("Failed to set property %s: %s\n", name,         \
 568                         fdt_strerror(ret));                             \
 569         }                                                               \
 570         ret;                                                            \
 571 })
 572
 573
 574 int karo_fdt_create_fb_mode(void *blob, const char *name,
 575                         struct fb_videomode *fb_mode)
 576 {
 577         int off = fdt_path_offset(blob, "display");
 578         int ret;
 579         const char *subnode = "display-timings";
 580
 581         if (off < 0) {
 582                 printf("'display' node not found in FDT\n");
 583                 return off;
 584         }
 585
 586         ret = fdt_increase_size(blob, 512);
 587         if (ret) {
 588                 printf("Failed to increase FDT size: %s\n", fdt_strerror(ret));
 589                 return ret;
 590         }
 591
 592         ret = fdt_subnode_offset(blob, off, subnode);
 593         if (ret < 0) {
 594                 debug("Could not find node '%s' in FDT: %s\n", subnode,
 595                         fdt_strerror(ret));
 596                 ret = fdt_add_subnode(blob, off, subnode);
 597                 if (ret < 0) {
 598                         printf("Failed to add %s subnode: %s\n", subnode,
 599                                 fdt_strerror(ret));
 600                         return ret;
 601                 }
 602         }
 603
 604         ret = fdt_add_subnode(blob, ret, name);
 605         if (ret < 0) {
 606                 printf("Failed to add %s subnode: %s\n", name,
 607                         fdt_strerror(ret));
 608                 return ret;
 609         }
 610         off = ret;
 611
 612         ret = SET_FB_PROP("clock-frequency",
 613                         PICOS2KHZ(fb_mode->pixclock) * 1000);
 614         if (ret)
 615                 goto out;
 616         ret = SET_FB_PROP("hactive", fb_mode->xres);
 617         if (ret)
 618                 goto out;
 619         ret = SET_FB_PROP("vactive", fb_mode->yres);
 620         if (ret)
 621                 goto out;
 622         ret = SET_FB_PROP("hback-porch", fb_mode->left_margin);
 623         if (ret)
 624                 goto out;
 625         ret = SET_FB_PROP("hsync-len", fb_mode->hsync_len);
 626         if (ret)
 627                 goto out;
 628         ret = SET_FB_PROP("hfront-porch", fb_mode->right_margin);
 629         if (ret)
 630                 goto out;
 631         ret = SET_FB_PROP("vback-porch", fb_mode->upper_margin);
 632         if (ret)
 633                 goto out;
 634         ret = SET_FB_PROP("vsync-len", fb_mode->vsync_len);
 635         if (ret)
 636                 goto out;
 637         ret = SET_FB_PROP("vfront-porch", fb_mode->lower_margin);
 638         if (ret)
 639                 goto out;
 640         ret = SET_FB_PROP("hsync-active",
 641                         fb_mode->sync & FB_SYNC_VERT_HIGH_ACT ? 1 : 0);
 642         if (ret)
 643                 goto out;
 644         ret = SET_FB_PROP("vsync-active",
 645                         fb_mode->sync & FB_SYNC_VERT_HIGH_ACT ? 1 : 0);
 646         if (ret)
 647                 goto out;
 648         ret = SET_FB_PROP("de-active",
 649                         !(fb_mode->sync & FB_SYNC_OE_LOW_ACT));
 650         if (ret)
 651                 goto out;
 652         ret = SET_FB_PROP("pixelclk-active",
 653                         !(fb_mode->sync & FB_SYNC_CLK_LAT_FALL));
 654 out:
 655         karo_set_fdtsize(blob);
 656         return ret;
 657 }
 658
 659 int karo_fdt_update_fb_mode(void *blob, const char *name)
 660 {
 661         int off = fdt_path_offset(blob, "display");
 662         const char *subnode = "display-timings";
 663
 664         if (off < 0)
 665                 return off;
 666
 667         if (name == NULL) {
 668                 int ret;
 669
 670                 debug("Disabling node '%s' at %03x\n",
 671                         fdt_get_name(blob, off, NULL), off);
 672                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 673                 return ret;
 674         }
 675
 676         off = fdt_subnode_offset(blob, off, subnode);
 677         if (off < 0) {
 678                 debug("Could not find node '%s' in FDT: %s\n", subnode,
 679                         fdt_strerror(off));
 680                 return off;
 681         }
 682         while (off > 0) {
 683                 const char *n, *endp;
 684                 int len, d = 1;
 685
 686                 off = fdt_next_node(blob, off, &d);
 687                 if (off < 0)
 688                         return off;
 689                 if (d < 1)
 690                         return -EINVAL;
 691                 if (d > 2) {
 692                         debug("Skipping node @ %04x %s depth %d\n", off,
 693                                 fdt_get_name(blob, off, NULL), d);
 694                         continue;
 695                 }
 696                 debug("parsing subnode @ %04x %s depth %d\n", off,
 697                         fdt_get_name(blob, off, NULL), d);
 698
 699                 n = fdt_getprop(blob, off, "panel-name", &len);
 700                 if (!n) {
 701                         n = fdt_get_name(blob, off, NULL);
 702                         if (strcasecmp(n, name) == 0) {
 703                                 break;
 704                         }
 705                 } else {
 706                         int found = 0;
 707
 708                         for (endp = n + len; n < endp; n += strlen(n) + 1) {
 709                                 debug("Checking panel-name '%s'\n", n);
 710                                 if (strcasecmp(n, name) == 0) {
 711                                         debug("Using node %s @ %04x\n",
 712                                                 fdt_get_name(blob, off, NULL), off);
 713                                         found = 1;
 714                                         break;
 715                                 }
 716                         }
 717                         if (found)
 718                                 break;
 719                 }
 720         }
 721         if (off > 0)
 722                 return fdt_update_native_fb_mode(blob, off);
 723         return off;
 724 }
 725
 726 int karo_fdt_get_lcd_bus_width(const void *blob, int default_width)
 727 {
 728         int off = fdt_path_offset(blob, "display");
 729
 730         if (off >= 0) {
 731                 const uint32_t *prop;
 732
 733                 prop = fdt_getprop(blob, off, "fsl,data-width", NULL);
 734                 if (prop)
 735                         return fdt32_to_cpu(*prop);
 736         }
 737         return default_width;
 738 }
 739
 740 int karo_fdt_get_lvds_mapping(const void *blob, int default_mapping)
 741 {
 742         int off = fdt_path_offset(blob, "display");
 743
 744         if (off >= 0) {
 745                 const char *prop;
 746
 747                 prop = fdt_getprop(blob, off, "fsl,data-mapping", NULL);
 748                 if (prop)
 749                         return strcmp(prop, "jeida") == 0;
 750         }
 751         return default_mapping;
 752 }
 753
 754 u8 karo_fdt_get_lvds_channels(const void *blob)
 755 {
 756         static const char *lvds_chans[] = {
 757                 "lvds0",
 758                 "lvds1",
 759         };
 760         u8 lvds_chan_mask = 0;
 761         int i;
 762
 763         for (i = 0; i < ARRAY_SIZE(lvds_chans); i++) {
 764                 const char *status;
 765                 int off = fdt_path_offset(blob, lvds_chans[i]);
 766
 767                 if (off < 0)
 768                         continue;
 769
 770                 status = fdt_getprop(blob, off, "status", NULL);
 771                 if (status && strcmp(status, "okay") == 0) {
 772                         debug("%s is enabled\n", lvds_chans[i]);
 773                         lvds_chan_mask |= 1 << i;
 774                 }
 775         }
 776         return lvds_chan_mask;
 777 }