drivers/video/fbdev/amba-clcd-versatile.c

   1 #include <linux/device.h>
   2 #include <linux/dma-mapping.h>
   3 #include <linux/amba/bus.h>
   4 #include <linux/amba/clcd.h>
   5 #include <linux/platform_data/video-clcd-versatile.h>
   6 #include <linux/of.h>
   7 #include <linux/of_graph.h>
   8 #include <linux/regmap.h>
   9 #include <linux/mfd/syscon.h>
  10 #include <linux/bitops.h>
  11 #include "amba-clcd-versatile.h"
  12
  13 static struct clcd_panel vga = {
  14         .mode           = {
  15                 .name           = "VGA",
  16                 .refresh        = 60,
  17                 .xres           = 640,
  18                 .yres           = 480,
  19                 .pixclock       = 39721,
  20                 .left_margin    = 40,
  21                 .right_margin   = 24,
  22                 .upper_margin   = 32,
  23                 .lower_margin   = 11,
  24                 .hsync_len      = 96,
  25                 .vsync_len      = 2,
  26                 .sync           = 0,
  27                 .vmode          = FB_VMODE_NONINTERLACED,
  28         },
  29         .width          = -1,
  30         .height         = -1,
  31         .tim2           = TIM2_BCD | TIM2_IPC,
  32         .cntl           = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
  33         .caps           = CLCD_CAP_5551 | CLCD_CAP_565 | CLCD_CAP_888,
  34         .bpp            = 16,
  35 };
  36
  37 static struct clcd_panel xvga = {
  38         .mode           = {
  39                 .name           = "XVGA",
  40                 .refresh        = 60,
  41                 .xres           = 1024,
  42                 .yres           = 768,
  43                 .pixclock       = 15748,
  44                 .left_margin    = 152,
  45                 .right_margin   = 48,
  46                 .upper_margin   = 23,
  47                 .lower_margin   = 3,
  48                 .hsync_len      = 104,
  49                 .vsync_len      = 4,
  50                 .sync           = 0,
  51                 .vmode          = FB_VMODE_NONINTERLACED,
  52         },
  53         .width          = -1,
  54         .height         = -1,
  55         .tim2           = TIM2_BCD | TIM2_IPC,
  56         .cntl           = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
  57         .caps           = CLCD_CAP_5551 | CLCD_CAP_565 | CLCD_CAP_888,
  58         .bpp            = 16,
  59 };
  60
  61 /* Sanyo TM38QV67A02A - 3.8 inch QVGA (320x240) Color TFT */
  62 static struct clcd_panel sanyo_tm38qv67a02a = {
  63         .mode           = {
  64                 .name           = "Sanyo TM38QV67A02A",
  65                 .refresh        = 116,
  66                 .xres           = 320,
  67                 .yres           = 240,
  68                 .pixclock       = 100000,
  69                 .left_margin    = 6,
  70                 .right_margin   = 6,
  71                 .upper_margin   = 5,
  72                 .lower_margin   = 5,
  73                 .hsync_len      = 6,
  74                 .vsync_len      = 6,
  75                 .sync           = 0,
  76                 .vmode          = FB_VMODE_NONINTERLACED,
  77         },
  78         .width          = -1,
  79         .height         = -1,
  80         .tim2           = TIM2_BCD,
  81         .cntl           = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
  82         .caps           = CLCD_CAP_5551,
  83         .bpp            = 16,
  84 };
  85
  86 static struct clcd_panel sanyo_2_5_in = {
  87         .mode           = {
  88                 .name           = "Sanyo QVGA Portrait",
  89                 .refresh        = 116,
  90                 .xres           = 240,
  91                 .yres           = 320,
  92                 .pixclock       = 100000,
  93                 .left_margin    = 20,
  94                 .right_margin   = 10,
  95                 .upper_margin   = 2,
  96                 .lower_margin   = 2,
  97                 .hsync_len      = 10,
  98                 .vsync_len      = 2,
  99                 .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 100                 .vmode          = FB_VMODE_NONINTERLACED,
 101         },
 102         .width          = -1,
 103         .height         = -1,
 104         .tim2           = TIM2_IVS | TIM2_IHS | TIM2_IPC,
 105         .cntl           = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
 106         .caps           = CLCD_CAP_5551,
 107         .bpp            = 16,
 108 };
 109
 110 /* Epson L2F50113T00 - 2.2 inch 176x220 Color TFT */
 111 static struct clcd_panel epson_l2f50113t00 = {
 112         .mode           = {
 113                 .name           = "Epson L2F50113T00",
 114                 .refresh        = 390,
 115                 .xres           = 176,
 116                 .yres           = 220,
 117                 .pixclock       = 62500,
 118                 .left_margin    = 3,
 119                 .right_margin   = 2,
 120                 .upper_margin   = 1,
 121                 .lower_margin   = 0,
 122                 .hsync_len      = 3,
 123                 .vsync_len      = 2,
 124                 .sync           = 0,
 125                 .vmode          = FB_VMODE_NONINTERLACED,
 126         },
 127         .width          = -1,
 128         .height         = -1,
 129         .tim2           = TIM2_BCD | TIM2_IPC,
 130         .cntl           = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
 131         .caps           = CLCD_CAP_5551,
 132         .bpp            = 16,
 133 };
 134
 135 static struct clcd_panel *panels[] = {
 136         &vga,
 137         &xvga,
 138         &sanyo_tm38qv67a02a,
 139         &sanyo_2_5_in,
 140         &epson_l2f50113t00,
 141 };
 142
 143 struct clcd_panel *versatile_clcd_get_panel(const char *name)
 144 {
 145         int i;
 146
 147         for (i = 0; i < ARRAY_SIZE(panels); i++)
 148                 if (strcmp(panels[i]->mode.name, name) == 0)
 149                         break;
 150
 151         if (i < ARRAY_SIZE(panels))
 152                 return panels[i];
 153
 154         pr_err("CLCD: couldn't get parameters for panel %s\n", name);
 155
 156         return NULL;
 157 }
 158
 159 int versatile_clcd_setup_dma(struct clcd_fb *fb, unsigned long framesize)
 160 {
 161         dma_addr_t dma;
 162
 163         fb->fb.screen_base = dma_alloc_wc(&fb->dev->dev, framesize, &dma,
 164                                           GFP_KERNEL);
 165         if (!fb->fb.screen_base) {
 166                 pr_err("CLCD: unable to map framebuffer\n");
 167                 return -ENOMEM;
 168         }
 169
 170         fb->fb.fix.smem_start   = dma;
 171         fb->fb.fix.smem_len     = framesize;
 172
 173         return 0;
 174 }
 175
 176 int versatile_clcd_mmap_dma(struct clcd_fb *fb, struct vm_area_struct *vma)
 177 {
 178         return dma_mmap_wc(&fb->dev->dev, vma, fb->fb.screen_base,
 179                            fb->fb.fix.smem_start, fb->fb.fix.smem_len);
 180 }
 181
 182 void versatile_clcd_remove_dma(struct clcd_fb *fb)
 183 {
 184         dma_free_wc(&fb->dev->dev, fb->fb.fix.smem_len, fb->fb.screen_base,
 185                     fb->fb.fix.smem_start);
 186 }
 187
 188 #ifdef CONFIG_OF
 189
 190 static struct regmap *versatile_syscon_map;
 191 static struct regmap *versatile_ib2_map;
 192
 193 /*
 194  * We detect the different syscon types from the compatible strings.
 195  */
 196 enum versatile_clcd {
 197         INTEGRATOR_CLCD_CM,
 198         VERSATILE_CLCD,
 199         REALVIEW_CLCD_EB,
 200         REALVIEW_CLCD_PB1176,
 201         REALVIEW_CLCD_PB11MP,
 202         REALVIEW_CLCD_PBA8,
 203         REALVIEW_CLCD_PBX,
 204 };
 205
 206 static const struct of_device_id versatile_clcd_of_match[] = {
 207         {
 208                 .compatible = "arm,core-module-integrator",
 209                 .data = (void *)INTEGRATOR_CLCD_CM,
 210         },
 211         {
 212                 .compatible = "arm,versatile-sysreg",
 213                 .data = (void *)VERSATILE_CLCD,
 214         },
 215         {
 216                 .compatible = "arm,realview-eb-syscon",
 217                 .data = (void *)REALVIEW_CLCD_EB,
 218         },
 219         {
 220                 .compatible = "arm,realview-pb1176-syscon",
 221                 .data = (void *)REALVIEW_CLCD_PB1176,
 222         },
 223         {
 224                 .compatible = "arm,realview-pb11mp-syscon",
 225                 .data = (void *)REALVIEW_CLCD_PB11MP,
 226         },
 227         {
 228                 .compatible = "arm,realview-pba8-syscon",
 229                 .data = (void *)REALVIEW_CLCD_PBA8,
 230         },
 231         {
 232                 .compatible = "arm,realview-pbx-syscon",
 233                 .data = (void *)REALVIEW_CLCD_PBX,
 234         },
 235         {},
 236 };
 237
 238 /*
 239  * Core module CLCD control on the Integrator/CP, bits
 240  * 8 thru 19 of the CM_CONTROL register controls a bunch
 241  * of CLCD settings.
 242  */
 243 #define INTEGRATOR_HDR_CTRL_OFFSET      0x0C
 244 #define INTEGRATOR_CLCD_LCDBIASEN       BIT(8)
 245 #define INTEGRATOR_CLCD_LCDBIASUP       BIT(9)
 246 #define INTEGRATOR_CLCD_LCDBIASDN       BIT(10)
 247 /* Bits 11,12,13 controls the LCD type */
 248 #define INTEGRATOR_CLCD_LCDMUX_MASK     (BIT(11)|BIT(12)|BIT(13))
 249 #define INTEGRATOR_CLCD_LCDMUX_LCD24    BIT(11)
 250 #define INTEGRATOR_CLCD_LCDMUX_VGA565   BIT(12)
 251 #define INTEGRATOR_CLCD_LCDMUX_SHARP    (BIT(11)|BIT(12))
 252 #define INTEGRATOR_CLCD_LCDMUX_VGA555   BIT(13)
 253 #define INTEGRATOR_CLCD_LCDMUX_VGA24    (BIT(11)|BIT(12)|BIT(13))
 254 #define INTEGRATOR_CLCD_LCD0_EN         BIT(14)
 255 #define INTEGRATOR_CLCD_LCD1_EN         BIT(15)
 256 /* R/L flip on Sharp */
 257 #define INTEGRATOR_CLCD_LCD_STATIC1     BIT(16)
 258 /* U/D flip on Sharp */
 259 #define INTEGRATOR_CLCD_LCD_STATIC2     BIT(17)
 260 /* No connection on Sharp */
 261 #define INTEGRATOR_CLCD_LCD_STATIC      BIT(18)
 262 /* 0 = 24bit VGA, 1 = 18bit VGA */
 263 #define INTEGRATOR_CLCD_LCD_N24BITEN    BIT(19)
 264
 265 #define INTEGRATOR_CLCD_MASK            (INTEGRATOR_CLCD_LCDBIASEN | \
 266                                          INTEGRATOR_CLCD_LCDBIASUP | \
 267                                          INTEGRATOR_CLCD_LCDBIASDN | \
 268                                          INTEGRATOR_CLCD_LCDMUX_MASK | \
 269                                          INTEGRATOR_CLCD_LCD0_EN | \
 270                                          INTEGRATOR_CLCD_LCD1_EN | \
 271                                          INTEGRATOR_CLCD_LCD_STATIC1 | \
 272                                          INTEGRATOR_CLCD_LCD_STATIC2 | \
 273                                          INTEGRATOR_CLCD_LCD_STATIC | \
 274                                          INTEGRATOR_CLCD_LCD_N24BITEN)
 275
 276 static void integrator_clcd_enable(struct clcd_fb *fb)
 277 {
 278         struct fb_var_screeninfo *var = &fb->fb.var;
 279         u32 val;
 280
 281         dev_info(&fb->dev->dev, "enable Integrator CLCD connectors\n");
 282
 283         /* FIXME: really needed? */
 284         val = INTEGRATOR_CLCD_LCD_STATIC1 | INTEGRATOR_CLCD_LCD_STATIC2 |
 285                 INTEGRATOR_CLCD_LCD0_EN | INTEGRATOR_CLCD_LCD1_EN;
 286         if (var->bits_per_pixel <= 8 ||
 287             (var->bits_per_pixel == 16 && var->green.length == 5))
 288                 /* Pseudocolor, RGB555, BGR555 */
 289                 val |= INTEGRATOR_CLCD_LCDMUX_VGA555;
 290         else if (fb->fb.var.bits_per_pixel <= 16)
 291                 /* truecolor RGB565 */
 292                 val |= INTEGRATOR_CLCD_LCDMUX_VGA565;
 293         else
 294                 val = 0; /* no idea for this, don't trust the docs */
 295
 296         regmap_update_bits(versatile_syscon_map,
 297                            INTEGRATOR_HDR_CTRL_OFFSET,
 298                            INTEGRATOR_CLCD_MASK,
 299                            val);
 300 }
 301
 302 /*
 303  * This configuration register in the Versatile and RealView
 304  * family is uniformly present but appears more and more
 305  * unutilized starting with the RealView series.
 306  */
 307 #define SYS_CLCD                        0x50
 308 #define SYS_CLCD_MODE_MASK              (BIT(0)|BIT(1))
 309 #define SYS_CLCD_MODE_888               0
 310 #define SYS_CLCD_MODE_5551              BIT(0)
 311 #define SYS_CLCD_MODE_565_R_LSB         BIT(1)
 312 #define SYS_CLCD_MODE_565_B_LSB         (BIT(0)|BIT(1))
 313 #define SYS_CLCD_CONNECTOR_MASK         (BIT(2)|BIT(3)|BIT(4)|BIT(5))
 314 #define SYS_CLCD_NLCDIOON               BIT(2)
 315 #define SYS_CLCD_VDDPOSSWITCH           BIT(3)
 316 #define SYS_CLCD_PWR3V5SWITCH           BIT(4)
 317 #define SYS_CLCD_VDDNEGSWITCH           BIT(5)
 318 #define SYS_CLCD_TSNSS                  BIT(6) /* touchscreen enable */
 319 #define SYS_CLCD_SSPEXP                 BIT(7) /* SSP expansion enable */
 320
 321 /* The Versatile can detect the connected panel type */
 322 #define SYS_CLCD_CLCDID_MASK            (BIT(8)|BIT(9)|BIT(10)|BIT(11)|BIT(12))
 323 #define SYS_CLCD_ID_SANYO_3_8           (0x00 << 8)
 324 #define SYS_CLCD_ID_SHARP_8_4           (0x01 << 8)
 325 #define SYS_CLCD_ID_EPSON_2_2           (0x02 << 8)
 326 #define SYS_CLCD_ID_SANYO_2_5           (0x07 << 8)
 327 #define SYS_CLCD_ID_VGA                 (0x1f << 8)
 328
 329 #define SYS_CLCD_TSNDAV                 BIT(13) /* data ready from TS */
 330
 331 /* IB2 control register for the Versatile daughterboard */
 332 #define IB2_CTRL                        0x00
 333 #define IB2_CTRL_LCD_SD                 BIT(1) /* 1 = shut down LCD */
 334 #define IB2_CTRL_LCD_BL_ON              BIT(0)
 335 #define IB2_CTRL_LCD_MASK               (BIT(0)|BIT(1))
 336
 337 static void versatile_clcd_disable(struct clcd_fb *fb)
 338 {
 339         dev_info(&fb->dev->dev, "disable Versatile CLCD connectors\n");
 340         regmap_update_bits(versatile_syscon_map,
 341                            SYS_CLCD,
 342                            SYS_CLCD_CONNECTOR_MASK,
 343                            0);
 344
 345         /* If we're on an IB2 daughterboard, turn off display */
 346         if (versatile_ib2_map) {
 347                 dev_info(&fb->dev->dev, "disable IB2 display\n");
 348                 regmap_update_bits(versatile_ib2_map,
 349                                    IB2_CTRL,
 350                                    IB2_CTRL_LCD_MASK,
 351                                    IB2_CTRL_LCD_SD);
 352         }
 353 }
 354
 355 static void versatile_clcd_enable(struct clcd_fb *fb)
 356 {
 357         struct fb_var_screeninfo *var = &fb->fb.var;
 358         u32 val = 0;
 359
 360         dev_info(&fb->dev->dev, "enable Versatile CLCD connectors\n");
 361         switch (var->green.length) {
 362         case 5:
 363                 val |= SYS_CLCD_MODE_5551;
 364                 break;
 365         case 6:
 366                 if (var->red.offset == 0)
 367                         val |= SYS_CLCD_MODE_565_R_LSB;
 368                 else
 369                         val |= SYS_CLCD_MODE_565_B_LSB;
 370                 break;
 371         case 8:
 372                 val |= SYS_CLCD_MODE_888;
 373                 break;
 374         }
 375
 376         /* Set up the MUX */
 377         regmap_update_bits(versatile_syscon_map,
 378                            SYS_CLCD,
 379                            SYS_CLCD_MODE_MASK,
 380                            val);
 381
 382         /* Then enable the display */
 383         regmap_update_bits(versatile_syscon_map,
 384                            SYS_CLCD,
 385                            SYS_CLCD_CONNECTOR_MASK,
 386                            SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH);
 387
 388         /* If we're on an IB2 daughterboard, turn on display */
 389         if (versatile_ib2_map) {
 390                 dev_info(&fb->dev->dev, "enable IB2 display\n");
 391                 regmap_update_bits(versatile_ib2_map,
 392                                    IB2_CTRL,
 393                                    IB2_CTRL_LCD_MASK,
 394                                    IB2_CTRL_LCD_BL_ON);
 395         }
 396 }
 397
 398 static void versatile_clcd_decode(struct clcd_fb *fb, struct clcd_regs *regs)
 399 {
 400         clcdfb_decode(fb, regs);
 401
 402         /* Always clear BGR for RGB565: we do the routing externally */
 403         if (fb->fb.var.green.length == 6)
 404                 regs->cntl &= ~CNTL_BGR;
 405 }
 406
 407 static void realview_clcd_disable(struct clcd_fb *fb)
 408 {
 409         dev_info(&fb->dev->dev, "disable RealView CLCD connectors\n");
 410         regmap_update_bits(versatile_syscon_map,
 411                            SYS_CLCD,
 412                            SYS_CLCD_CONNECTOR_MASK,
 413                            0);
 414 }
 415
 416 static void realview_clcd_enable(struct clcd_fb *fb)
 417 {
 418         dev_info(&fb->dev->dev, "enable RealView CLCD connectors\n");
 419         regmap_update_bits(versatile_syscon_map,
 420                            SYS_CLCD,
 421                            SYS_CLCD_CONNECTOR_MASK,
 422                            SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH);
 423 }
 424
 425 struct versatile_panel {
 426         u32 id;
 427         char *compatible;
 428         bool ib2;
 429 };
 430
 431 static const struct versatile_panel versatile_panels[] = {
 432         {
 433                 .id = SYS_CLCD_ID_VGA,
 434                 .compatible = "VGA",
 435         },
 436         {
 437                 .id = SYS_CLCD_ID_SANYO_3_8,
 438                 .compatible = "sanyo,tm38qv67a02a",
 439         },
 440         {
 441                 .id = SYS_CLCD_ID_SHARP_8_4,
 442                 .compatible = "sharp,lq084v1dg21",
 443         },
 444         {
 445                 .id = SYS_CLCD_ID_EPSON_2_2,
 446                 .compatible = "epson,l2f50113t00",
 447         },
 448         {
 449                 .id = SYS_CLCD_ID_SANYO_2_5,
 450                 .compatible = "sanyo,alr252rgt",
 451                 .ib2 = true,
 452         },
 453 };
 454
 455 static void versatile_panel_probe(struct device *dev,
 456                                   struct device_node *endpoint)
 457 {
 458         struct versatile_panel const *vpanel = NULL;
 459         struct device_node *panel = NULL;
 460         u32 val;
 461         int ret;
 462         int i;
 463
 464         /*
 465          * The Versatile CLCD has a panel auto-detection mechanism.
 466          * We use this and look for the compatible panel in the
 467          * device tree.
 468          */
 469         ret = regmap_read(versatile_syscon_map, SYS_CLCD, &val);
 470         if (ret) {
 471                 dev_err(dev, "cannot read CLCD syscon register\n");
 472                 return;
 473         }
 474         val &= SYS_CLCD_CLCDID_MASK;
 475
 476         /* First find corresponding panel information */
 477         for (i = 0; i < ARRAY_SIZE(versatile_panels); i++) {
 478                 vpanel = &versatile_panels[i];
 479
 480                 if (val == vpanel->id) {
 481                         dev_err(dev, "autodetected panel \"%s\"\n",
 482                                 vpanel->compatible);
 483                         break;
 484                 }
 485         }
 486         if (i == ARRAY_SIZE(versatile_panels)) {
 487                 dev_err(dev, "could not auto-detect panel\n");
 488                 return;
 489         }
 490
 491         panel = of_graph_get_remote_port_parent(endpoint);
 492         if (!panel) {
 493                 dev_err(dev, "could not locate panel in DT\n");
 494                 return;
 495         }
 496         if (!of_device_is_compatible(panel, vpanel->compatible))
 497                 dev_err(dev, "panel in DT is not compatible with the "
 498                         "auto-detected panel, continuing anyway\n");
 499
 500         /*
 501          * If we have a Sanyo 2.5" port
 502          * that we're running on an IB2 and proceed to look for the
 503          * IB2 syscon regmap.
 504          */
 505         if (!vpanel->ib2)
 506                 return;
 507
 508         versatile_ib2_map = syscon_regmap_lookup_by_compatible(
 509                 "arm,versatile-ib2-syscon");
 510         if (IS_ERR(versatile_ib2_map)) {
 511                 dev_err(dev, "could not locate IB2 control register\n");
 512                 versatile_ib2_map = NULL;
 513                 return;
 514         }
 515 }
 516
 517 int versatile_clcd_init_panel(struct clcd_fb *fb,
 518                               struct device_node *endpoint)
 519 {
 520         const struct of_device_id *clcd_id;
 521         enum versatile_clcd versatile_clcd_type;
 522         struct device_node *np;
 523         struct regmap *map;
 524         struct device *dev = &fb->dev->dev;
 525
 526         np = of_find_matching_node_and_match(NULL, versatile_clcd_of_match,
 527                                              &clcd_id);
 528         if (!np) {
 529                 dev_err(dev, "no Versatile syscon node\n");
 530                 return -ENODEV;
 531         }
 532         versatile_clcd_type = (enum versatile_clcd)clcd_id->data;
 533
 534         map = syscon_node_to_regmap(np);
 535         if (IS_ERR(map)) {
 536                 dev_err(dev, "no Versatile syscon regmap\n");
 537                 return PTR_ERR(map);
 538         }
 539
 540         switch (versatile_clcd_type) {
 541         case INTEGRATOR_CLCD_CM:
 542                 versatile_syscon_map = map;
 543                 fb->board->enable = integrator_clcd_enable;
 544                 /* Override the caps, we have only these */
 545                 fb->board->caps = CLCD_CAP_5551 | CLCD_CAP_RGB565 |
 546                         CLCD_CAP_888;
 547                 dev_info(dev, "set up callbacks for Integrator PL110\n");
 548                 break;
 549         case VERSATILE_CLCD:
 550                 versatile_syscon_map = map;
 551                 fb->board->enable = versatile_clcd_enable;
 552                 fb->board->disable = versatile_clcd_disable;
 553                 fb->board->decode = versatile_clcd_decode;
 554                 versatile_panel_probe(dev, endpoint);
 555                 dev_info(dev, "set up callbacks for Versatile\n");
 556                 break;
 557         case REALVIEW_CLCD_EB:
 558         case REALVIEW_CLCD_PB1176:
 559         case REALVIEW_CLCD_PB11MP:
 560         case REALVIEW_CLCD_PBA8:
 561         case REALVIEW_CLCD_PBX:
 562                 versatile_syscon_map = map;
 563                 fb->board->enable = realview_clcd_enable;
 564                 fb->board->disable = realview_clcd_disable;
 565                 dev_info(dev, "set up callbacks for RealView PL111\n");
 566                 break;
 567         default:
 568                 dev_info(dev, "unknown Versatile system controller\n");
 569                 break;
 570         }
 571
 572         return 0;
 573 }
 574 EXPORT_SYMBOL_GPL(versatile_clcd_init_panel);
 575 #endif