drivers/gpu/drm/imx/imx-ldb.c

   1 /*
   2  * i.MX drm driver - LVDS display bridge
   3  *
   4  * Copyright (C) 2012 Sascha Hauer, Pengutronix
   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
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/clk.h>
  18 #include <linux/component.h>
  19 #include <drm/drmP.h>
  20 #include <drm/drm_fb_helper.h>
  21 #include <drm/drm_crtc_helper.h>
  22 #include <drm/drm_panel.h>
  23 #include <linux/mfd/syscon.h>
  24 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
  25 #include <linux/of_device.h>
  26 #include <linux/of_graph.h>
  27 #include <video/of_videomode.h>
  28 #include <linux/regmap.h>
  29 #include <linux/videodev2.h>
  30
  31 #include "imx-drm.h"
  32
  33 #define DRIVER_NAME "imx-ldb"
  34
  35 #define LDB_CH0_MODE_EN_TO_DI0          (1 << 0)
  36 #define LDB_CH0_MODE_EN_TO_DI1          (3 << 0)
  37 #define LDB_CH0_MODE_EN_MASK            (3 << 0)
  38 #define LDB_CH1_MODE_EN_TO_DI0          (1 << 2)
  39 #define LDB_CH1_MODE_EN_TO_DI1          (3 << 2)
  40 #define LDB_CH1_MODE_EN_MASK            (3 << 2)
  41 #define LDB_SPLIT_MODE_EN               (1 << 4)
  42 #define LDB_DATA_WIDTH_CH0_24           (1 << 5)
  43 #define LDB_BIT_MAP_CH0_JEIDA           (1 << 6)
  44 #define LDB_DATA_WIDTH_CH1_24           (1 << 7)
  45 #define LDB_BIT_MAP_CH1_JEIDA           (1 << 8)
  46 #define LDB_DI0_VS_POL_ACT_LOW          (1 << 9)
  47 #define LDB_DI1_VS_POL_ACT_LOW          (1 << 10)
  48 #define LDB_BGREF_RMODE_INT             (1 << 15)
  49
  50 #define con_to_imx_ldb_ch(x) container_of(x, struct imx_ldb_channel, connector)
  51 #define enc_to_imx_ldb_ch(x) container_of(x, struct imx_ldb_channel, encoder)
  52
  53 struct imx_ldb;
  54
  55 struct imx_ldb_channel {
  56         struct imx_ldb *ldb;
  57         struct drm_connector connector;
  58         struct drm_encoder encoder;
  59         struct drm_panel *panel;
  60         struct device_node *child;
  61         int chno;
  62         void *edid;
  63         int edid_len;
  64         struct drm_display_mode mode;
  65         int mode_valid;
  66         int bus_format;
  67 };
  68
  69 struct bus_mux {
  70         int reg;
  71         int shift;
  72         int mask;
  73 };
  74
  75 struct imx_ldb {
  76         struct regmap *regmap;
  77         struct device *dev;
  78         struct imx_ldb_channel channel[2];
  79         struct clk *clk[2]; /* our own clock */
  80         struct clk *clk_sel[4]; /* parent of display clock */
  81         struct clk *clk_parent[4]; /* original parent of clk_sel */
  82         struct clk *clk_pll[2]; /* upstream clock we can adjust */
  83         u32 ldb_ctrl;
  84         const struct bus_mux *lvds_mux;
  85 };
  86
  87 static enum drm_connector_status imx_ldb_connector_detect(
  88                 struct drm_connector *connector, bool force)
  89 {
  90         return connector_status_connected;
  91 }
  92
  93 static int imx_ldb_connector_get_modes(struct drm_connector *connector)
  94 {
  95         struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
  96         int num_modes = 0;
  97
  98         if (imx_ldb_ch->panel && imx_ldb_ch->panel->funcs &&
  99             imx_ldb_ch->panel->funcs->get_modes) {
 100                 struct drm_display_info *di = &connector->display_info;
 101
 102                 num_modes = imx_ldb_ch->panel->funcs->get_modes(imx_ldb_ch->panel);
 103                 if (!imx_ldb_ch->bus_format && di->num_bus_formats)
 104                         imx_ldb_ch->bus_format = di->bus_formats[0];
 105                 if (num_modes > 0)
 106                         return num_modes;
 107         }
 108
 109         if (imx_ldb_ch->edid) {
 110                 drm_mode_connector_update_edid_property(connector,
 111                                                         imx_ldb_ch->edid);
 112                 num_modes = drm_add_edid_modes(connector, imx_ldb_ch->edid);
 113         }
 114
 115         if (imx_ldb_ch->mode_valid) {
 116                 struct drm_display_mode *mode;
 117
 118                 mode = drm_mode_create(connector->dev);
 119                 if (!mode)
 120                         return -EINVAL;
 121                 drm_mode_copy(mode, &imx_ldb_ch->mode);
 122                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 123                 drm_mode_probed_add(connector, mode);
 124                 num_modes++;
 125         }
 126
 127         return num_modes;
 128 }
 129
 130 static struct drm_encoder *imx_ldb_connector_best_encoder(
 131                 struct drm_connector *connector)
 132 {
 133         struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
 134
 135         return &imx_ldb_ch->encoder;
 136 }
 137
 138 static void imx_ldb_encoder_dpms(struct drm_encoder *encoder, int mode)
 139 {
 140 }
 141
 142 static void imx_ldb_set_clock(struct imx_ldb *ldb, int mux, int chno,
 143                 unsigned long serial_clk, unsigned long di_clk)
 144 {
 145         int ret;
 146
 147         dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
 148                         clk_get_rate(ldb->clk_pll[chno]), serial_clk);
 149         clk_set_rate(ldb->clk_pll[chno], serial_clk);
 150
 151         dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
 152                         clk_get_rate(ldb->clk_pll[chno]));
 153
 154         dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
 155                         clk_get_rate(ldb->clk[chno]),
 156                         (long int)di_clk);
 157         clk_set_rate(ldb->clk[chno], di_clk);
 158
 159         dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
 160                         clk_get_rate(ldb->clk[chno]));
 161
 162         /* set display clock mux to LDB input clock */
 163         ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk[chno]);
 164         if (ret)
 165                 dev_err(ldb->dev,
 166                         "unable to set di%d parent clock to ldb_di%d\n", mux,
 167                         chno);
 168 }
 169
 170 static void imx_ldb_encoder_prepare(struct drm_encoder *encoder)
 171 {
 172         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
 173         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 174         int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
 175         u32 bus_format;
 176
 177         switch (imx_ldb_ch->bus_format) {
 178         default:
 179                 dev_warn(ldb->dev,
 180                          "could not determine data mapping, default to 18-bit \"spwg\"\n");
 181                 /* fallthrough */
 182         case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
 183                 bus_format = MEDIA_BUS_FMT_RGB666_1X18;
 184                 break;
 185         case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
 186                 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 187                 if (imx_ldb_ch->chno == 0 || dual)
 188                         ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24;
 189                 if (imx_ldb_ch->chno == 1 || dual)
 190                         ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24;
 191                 break;
 192         case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
 193                 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 194                 if (imx_ldb_ch->chno == 0 || dual)
 195                         ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 |
 196                                          LDB_BIT_MAP_CH0_JEIDA;
 197                 if (imx_ldb_ch->chno == 1 || dual)
 198                         ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 |
 199                                          LDB_BIT_MAP_CH1_JEIDA;
 200                 break;
 201         }
 202
 203         imx_drm_set_bus_format(encoder, bus_format);
 204 }
 205
 206 static void imx_ldb_encoder_commit(struct drm_encoder *encoder)
 207 {
 208         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
 209         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 210         int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
 211         int mux = imx_drm_encoder_get_mux_id(imx_ldb_ch->child, encoder);
 212
 213         drm_panel_prepare(imx_ldb_ch->panel);
 214
 215         if (dual) {
 216                 clk_prepare_enable(ldb->clk[0]);
 217                 clk_prepare_enable(ldb->clk[1]);
 218         }
 219
 220         if (imx_ldb_ch == &ldb->channel[0] || dual) {
 221                 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
 222                 if (mux == 0 || ldb->lvds_mux)
 223                         ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI0;
 224                 else if (mux == 1)
 225                         ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI1;
 226         }
 227         if (imx_ldb_ch == &ldb->channel[1] || dual) {
 228                 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
 229                 if (mux == 1 || ldb->lvds_mux)
 230                         ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI1;
 231                 else if (mux == 0)
 232                         ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI0;
 233         }
 234
 235         if (ldb->lvds_mux) {
 236                 const struct bus_mux *lvds_mux = NULL;
 237
 238                 if (imx_ldb_ch == &ldb->channel[0])
 239                         lvds_mux = &ldb->lvds_mux[0];
 240                 else if (imx_ldb_ch == &ldb->channel[1])
 241                         lvds_mux = &ldb->lvds_mux[1];
 242
 243                 regmap_update_bits(ldb->regmap, lvds_mux->reg, lvds_mux->mask,
 244                                    mux << lvds_mux->shift);
 245         }
 246
 247         regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
 248
 249         drm_panel_enable(imx_ldb_ch->panel);
 250 }
 251
 252 static void imx_ldb_encoder_mode_set(struct drm_encoder *encoder,
 253                          struct drm_display_mode *orig_mode,
 254                          struct drm_display_mode *mode)
 255 {
 256         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
 257         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 258         int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
 259         unsigned long serial_clk;
 260         unsigned long di_clk = mode->clock * 1000;
 261         int mux = imx_drm_encoder_get_mux_id(imx_ldb_ch->child, encoder);
 262
 263         if (mode->clock > 170000) {
 264                 dev_warn(ldb->dev,
 265                          "%s: mode exceeds 170 MHz pixel clock\n", __func__);
 266         }
 267         if (mode->clock > 85000 && !dual) {
 268                 dev_warn(ldb->dev,
 269                          "%s: mode exceeds 85 MHz pixel clock\n", __func__);
 270         }
 271
 272         if (dual) {
 273                 serial_clk = 3500UL * mode->clock;
 274                 imx_ldb_set_clock(ldb, mux, 0, serial_clk, di_clk);
 275                 imx_ldb_set_clock(ldb, mux, 1, serial_clk, di_clk);
 276         } else {
 277                 serial_clk = 7000UL * mode->clock;
 278                 imx_ldb_set_clock(ldb, mux, imx_ldb_ch->chno, serial_clk,
 279                                   di_clk);
 280         }
 281
 282         /* FIXME - assumes straight connections DI0 --> CH0, DI1 --> CH1 */
 283         if (imx_ldb_ch == &ldb->channel[0]) {
 284                 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
 285                         ldb->ldb_ctrl |= LDB_DI0_VS_POL_ACT_LOW;
 286                 else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 287                         ldb->ldb_ctrl &= ~LDB_DI0_VS_POL_ACT_LOW;
 288         }
 289         if (imx_ldb_ch == &ldb->channel[1]) {
 290                 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
 291                         ldb->ldb_ctrl |= LDB_DI1_VS_POL_ACT_LOW;
 292                 else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 293                         ldb->ldb_ctrl &= ~LDB_DI1_VS_POL_ACT_LOW;
 294         }
 295 }
 296
 297 static void imx_ldb_encoder_disable(struct drm_encoder *encoder)
 298 {
 299         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
 300         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 301         int mux, ret;
 302
 303         /*
 304          * imx_ldb_encoder_disable is called by
 305          * drm_helper_disable_unused_functions without
 306          * the encoder being enabled before.
 307          */
 308         if (imx_ldb_ch == &ldb->channel[0] &&
 309             (ldb->ldb_ctrl & LDB_CH0_MODE_EN_MASK) == 0)
 310                 return;
 311         else if (imx_ldb_ch == &ldb->channel[1] &&
 312                  (ldb->ldb_ctrl & LDB_CH1_MODE_EN_MASK) == 0)
 313                 return;
 314
 315         drm_panel_disable(imx_ldb_ch->panel);
 316
 317         if (imx_ldb_ch == &ldb->channel[0])
 318                 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
 319         else if (imx_ldb_ch == &ldb->channel[1])
 320                 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
 321
 322         regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
 323
 324         if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
 325                 clk_disable_unprepare(ldb->clk[0]);
 326                 clk_disable_unprepare(ldb->clk[1]);
 327         }
 328
 329         if (ldb->lvds_mux) {
 330                 const struct bus_mux *lvds_mux = NULL;
 331
 332                 if (imx_ldb_ch == &ldb->channel[0])
 333                         lvds_mux = &ldb->lvds_mux[0];
 334                 else if (imx_ldb_ch == &ldb->channel[1])
 335                         lvds_mux = &ldb->lvds_mux[1];
 336
 337                 regmap_read(ldb->regmap, lvds_mux->reg, &mux);
 338                 mux &= lvds_mux->mask;
 339                 mux >>= lvds_mux->shift;
 340         } else {
 341                 mux = (imx_ldb_ch == &ldb->channel[0]) ? 0 : 1;
 342         }
 343
 344         /* set display clock mux back to original input clock */
 345         ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk_parent[mux]);
 346         if (ret)
 347                 dev_err(ldb->dev,
 348                         "unable to set di%d parent clock to original parent\n",
 349                         mux);
 350
 351         drm_panel_unprepare(imx_ldb_ch->panel);
 352 }
 353
 354 static const struct drm_connector_funcs imx_ldb_connector_funcs = {
 355         .dpms = drm_helper_connector_dpms,
 356         .fill_modes = drm_helper_probe_single_connector_modes,
 357         .detect = imx_ldb_connector_detect,
 358         .destroy = imx_drm_connector_destroy,
 359 };
 360
 361 static const struct drm_connector_helper_funcs imx_ldb_connector_helper_funcs = {
 362         .get_modes = imx_ldb_connector_get_modes,
 363         .best_encoder = imx_ldb_connector_best_encoder,
 364 };
 365
 366 static const struct drm_encoder_funcs imx_ldb_encoder_funcs = {
 367         .destroy = imx_drm_encoder_destroy,
 368 };
 369
 370 static const struct drm_encoder_helper_funcs imx_ldb_encoder_helper_funcs = {
 371         .dpms = imx_ldb_encoder_dpms,
 372         .prepare = imx_ldb_encoder_prepare,
 373         .commit = imx_ldb_encoder_commit,
 374         .mode_set = imx_ldb_encoder_mode_set,
 375         .disable = imx_ldb_encoder_disable,
 376 };
 377
 378 static int imx_ldb_get_clk(struct imx_ldb *ldb, int chno)
 379 {
 380         char clkname[16];
 381
 382         snprintf(clkname, sizeof(clkname), "di%d", chno);
 383         ldb->clk[chno] = devm_clk_get(ldb->dev, clkname);
 384         if (IS_ERR(ldb->clk[chno]))
 385                 return PTR_ERR(ldb->clk[chno]);
 386
 387         snprintf(clkname, sizeof(clkname), "di%d_pll", chno);
 388         ldb->clk_pll[chno] = devm_clk_get(ldb->dev, clkname);
 389
 390         return PTR_ERR_OR_ZERO(ldb->clk_pll[chno]);
 391 }
 392
 393 static int imx_ldb_register(struct drm_device *drm,
 394         struct imx_ldb_channel *imx_ldb_ch)
 395 {
 396         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 397         int ret;
 398
 399         ret = imx_drm_encoder_parse_of(drm, &imx_ldb_ch->encoder,
 400                                        imx_ldb_ch->child);
 401         if (ret)
 402                 return ret;
 403
 404         ret = imx_ldb_get_clk(ldb, imx_ldb_ch->chno);
 405         if (ret)
 406                 return ret;
 407
 408         if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
 409                 ret = imx_ldb_get_clk(ldb, 1);
 410                 if (ret)
 411                         return ret;
 412         }
 413
 414         drm_encoder_helper_add(&imx_ldb_ch->encoder,
 415                         &imx_ldb_encoder_helper_funcs);
 416         drm_encoder_init(drm, &imx_ldb_ch->encoder, &imx_ldb_encoder_funcs,
 417                          DRM_MODE_ENCODER_LVDS, NULL);
 418
 419         drm_connector_helper_add(&imx_ldb_ch->connector,
 420                         &imx_ldb_connector_helper_funcs);
 421         drm_connector_init(drm, &imx_ldb_ch->connector,
 422                            &imx_ldb_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
 423
 424         if (imx_ldb_ch->panel)
 425                 drm_panel_attach(imx_ldb_ch->panel, &imx_ldb_ch->connector);
 426
 427         drm_mode_connector_attach_encoder(&imx_ldb_ch->connector,
 428                         &imx_ldb_ch->encoder);
 429
 430         return 0;
 431 }
 432
 433 enum {
 434         LVDS_BIT_MAP_SPWG,
 435         LVDS_BIT_MAP_JEIDA
 436 };
 437
 438 struct imx_ldb_bit_mapping {
 439         u32 bus_format;
 440         u32 datawidth;
 441         const char * const mapping;
 442 };
 443
 444 static const struct imx_ldb_bit_mapping imx_ldb_bit_mappings[] = {
 445         { MEDIA_BUS_FMT_RGB666_1X7X3_SPWG,  18, "spwg" },
 446         { MEDIA_BUS_FMT_RGB888_1X7X4_SPWG,  24, "spwg" },
 447         { MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA, 24, "jeida" },
 448 };
 449
 450 static u32 of_get_bus_format(struct device *dev, struct device_node *np)
 451 {
 452         const char *bm;
 453         u32 datawidth = 0;
 454         int ret, i;
 455
 456         ret = of_property_read_string(np, "fsl,data-mapping", &bm);
 457         if (ret < 0)
 458                 return ret;
 459
 460         of_property_read_u32(np, "fsl,data-width", &datawidth);
 461
 462         for (i = 0; i < ARRAY_SIZE(imx_ldb_bit_mappings); i++) {
 463                 if (!strcasecmp(bm, imx_ldb_bit_mappings[i].mapping) &&
 464                     datawidth == imx_ldb_bit_mappings[i].datawidth)
 465                         return imx_ldb_bit_mappings[i].bus_format;
 466         }
 467
 468         dev_err(dev, "invalid data mapping: %d-bit \"%s\"\n", datawidth, bm);
 469
 470         return -ENOENT;
 471 }
 472
 473 static struct bus_mux imx6q_lvds_mux[2] = {
 474         {
 475                 .reg = IOMUXC_GPR3,
 476                 .shift = 6,
 477                 .mask = IMX6Q_GPR3_LVDS0_MUX_CTL_MASK,
 478         }, {
 479                 .reg = IOMUXC_GPR3,
 480                 .shift = 8,
 481                 .mask = IMX6Q_GPR3_LVDS1_MUX_CTL_MASK,
 482         }
 483 };
 484
 485 /*
 486  * For a device declaring compatible = "fsl,imx6q-ldb", "fsl,imx53-ldb",
 487  * of_match_device will walk through this list and take the first entry
 488  * matching any of its compatible values. Therefore, the more generic
 489  * entries (in this case fsl,imx53-ldb) need to be ordered last.
 490  */
 491 static const struct of_device_id imx_ldb_dt_ids[] = {
 492         { .compatible = "fsl,imx6q-ldb", .data = imx6q_lvds_mux, },
 493         { .compatible = "fsl,imx53-ldb", .data = NULL, },
 494         { }
 495 };
 496 MODULE_DEVICE_TABLE(of, imx_ldb_dt_ids);
 497
 498 static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
 499 {
 500         struct drm_device *drm = data;
 501         struct device_node *np = dev->of_node;
 502         const struct of_device_id *of_id =
 503                         of_match_device(imx_ldb_dt_ids, dev);
 504         struct device_node *child;
 505         const u8 *edidp;
 506         struct imx_ldb *imx_ldb;
 507         int dual;
 508         int ret;
 509         int i;
 510
 511         imx_ldb = devm_kzalloc(dev, sizeof(*imx_ldb), GFP_KERNEL);
 512         if (!imx_ldb)
 513                 return -ENOMEM;
 514
 515         imx_ldb->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
 516         if (IS_ERR(imx_ldb->regmap)) {
 517                 dev_err(dev, "failed to get parent regmap\n");
 518                 return PTR_ERR(imx_ldb->regmap);
 519         }
 520
 521         imx_ldb->dev = dev;
 522
 523         if (of_id)
 524                 imx_ldb->lvds_mux = of_id->data;
 525
 526         dual = of_property_read_bool(np, "fsl,dual-channel");
 527         if (dual)
 528                 imx_ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN;
 529
 530         /*
 531          * There are three different possible clock mux configurations:
 532          * i.MX53:  ipu1_di0_sel, ipu1_di1_sel
 533          * i.MX6q:  ipu1_di0_sel, ipu1_di1_sel, ipu2_di0_sel, ipu2_di1_sel
 534          * i.MX6dl: ipu1_di0_sel, ipu1_di1_sel, lcdif_sel
 535          * Map them all to di0_sel...di3_sel.
 536          */
 537         for (i = 0; i < 4; i++) {
 538                 char clkname[16];
 539
 540                 sprintf(clkname, "di%d_sel", i);
 541                 imx_ldb->clk_sel[i] = devm_clk_get(imx_ldb->dev, clkname);
 542                 if (IS_ERR(imx_ldb->clk_sel[i])) {
 543                         ret = PTR_ERR(imx_ldb->clk_sel[i]);
 544                         imx_ldb->clk_sel[i] = NULL;
 545                         break;
 546                 }
 547
 548                 imx_ldb->clk_parent[i] = clk_get_parent(imx_ldb->clk_sel[i]);
 549         }
 550         if (i == 0)
 551                 return ret;
 552
 553         for_each_child_of_node(np, child) {
 554                 struct imx_ldb_channel *channel;
 555                 struct device_node *port;
 556
 557                 ret = of_property_read_u32(child, "reg", &i);
 558                 if (ret || i < 0 || i > 1)
 559                         return -EINVAL;
 560
 561                 if (dual && i > 0) {
 562                         dev_warn(dev, "dual-channel mode, ignoring second output\n");
 563                         continue;
 564                 }
 565
 566                 if (!of_device_is_available(child))
 567                         continue;
 568
 569                 channel = &imx_ldb->channel[i];
 570                 channel->ldb = imx_ldb;
 571                 channel->chno = i;
 572                 channel->child = child;
 573
 574                 /*
 575                  * The output port is port@4 with an external 4-port mux or
 576                  * port@2 with the internal 2-port mux.
 577                  */
 578                 port = of_graph_get_port_by_id(child, imx_ldb->lvds_mux ? 4 : 2);
 579                 if (port) {
 580                         struct device_node *endpoint, *remote;
 581
 582                         endpoint = of_get_child_by_name(port, "endpoint");
 583                         if (endpoint) {
 584                                 remote = of_graph_get_remote_port_parent(endpoint);
 585                                 if (remote)
 586                                         channel->panel = of_drm_find_panel(remote);
 587                                 else
 588                                         return -EPROBE_DEFER;
 589                                 if (!channel->panel) {
 590                                         dev_err(dev, "panel not found: %s\n",
 591                                                 remote->full_name);
 592                                         return -EPROBE_DEFER;
 593                                 }
 594                         }
 595                 }
 596
 597                 edidp = of_get_property(child, "edid", &channel->edid_len);
 598                 if (edidp) {
 599                         channel->edid = kmemdup(edidp, channel->edid_len,
 600                                                 GFP_KERNEL);
 601                 } else if (!channel->panel) {
 602                         ret = of_get_drm_display_mode(child, &channel->mode, 0);
 603                         if (!ret)
 604                                 channel->mode_valid = 1;
 605                 }
 606
 607                 channel->bus_format = of_get_bus_format(dev, child);
 608                 if (channel->bus_format == -EINVAL) {
 609                         /*
 610                          * If no bus format was specified in the device tree,
 611                          * we can still get it from the connected panel later.
 612                          */
 613                         if (channel->panel && channel->panel->funcs &&
 614                             channel->panel->funcs->get_modes)
 615                                 channel->bus_format = 0;
 616                 }
 617                 if (channel->bus_format < 0) {
 618                         dev_err(dev, "could not determine data mapping: %d\n",
 619                                 channel->bus_format);
 620                         return channel->bus_format;
 621                 }
 622
 623                 ret = imx_ldb_register(drm, channel);
 624                 if (ret)
 625                         return ret;
 626         }
 627
 628         dev_set_drvdata(dev, imx_ldb);
 629
 630         return 0;
 631 }
 632
 633 static void imx_ldb_unbind(struct device *dev, struct device *master,
 634         void *data)
 635 {
 636         struct imx_ldb *imx_ldb = dev_get_drvdata(dev);
 637         int i;
 638
 639         for (i = 0; i < 2; i++) {
 640                 struct imx_ldb_channel *channel = &imx_ldb->channel[i];
 641
 642                 if (!channel->connector.funcs)
 643                         continue;
 644
 645                 channel->connector.funcs->destroy(&channel->connector);
 646                 channel->encoder.funcs->destroy(&channel->encoder);
 647
 648                 kfree(channel->edid);
 649         }
 650 }
 651
 652 static const struct component_ops imx_ldb_ops = {
 653         .bind   = imx_ldb_bind,
 654         .unbind = imx_ldb_unbind,
 655 };
 656
 657 static int imx_ldb_probe(struct platform_device *pdev)
 658 {
 659         return component_add(&pdev->dev, &imx_ldb_ops);
 660 }
 661
 662 static int imx_ldb_remove(struct platform_device *pdev)
 663 {
 664         component_del(&pdev->dev, &imx_ldb_ops);
 665         return 0;
 666 }
 667
 668 static struct platform_driver imx_ldb_driver = {
 669         .probe          = imx_ldb_probe,
 670         .remove         = imx_ldb_remove,
 671         .driver         = {
 672                 .of_match_table = imx_ldb_dt_ids,
 673                 .name   = DRIVER_NAME,
 674         },
 675 };
 676
 677 module_platform_driver(imx_ldb_driver);
 678
 679 MODULE_DESCRIPTION("i.MX LVDS driver");
 680 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 681 MODULE_LICENSE("GPL");
 682 MODULE_ALIAS("platform:" DRIVER_NAME);