drivers/memory/atmel-ebi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * EBI driver for Atmel chips
   4  * inspired by the fsl weim bus driver
   5  *
   6  * Copyright (C) 2013 Jean-Jacques Hiblot <jjhiblot@traphandler.com>
   7  */
   8
   9 #include <linux/clk.h>
  10 #include <linux/io.h>
  11 #include <linux/mfd/syscon.h>
  12 #include <linux/mfd/syscon/atmel-matrix.h>
  13 #include <linux/mfd/syscon/atmel-smc.h>
  14 #include <linux/init.h>
  15 #include <linux/of_device.h>
  16 #include <linux/regmap.h>
  17 #include <soc/at91/atmel-sfr.h>
  18
  19 #define AT91_EBI_NUM_CS         8
  20
  21 struct atmel_ebi_dev_config {
  22         int cs;
  23         struct atmel_smc_cs_conf smcconf;
  24 };
  25
  26 struct atmel_ebi;
  27
  28 struct atmel_ebi_dev {
  29         struct list_head node;
  30         struct atmel_ebi *ebi;
  31         u32 mode;
  32         int numcs;
  33         struct atmel_ebi_dev_config configs[];
  34 };
  35
  36 struct atmel_ebi_caps {
  37         unsigned int available_cs;
  38         unsigned int ebi_csa_offs;
  39         const char *regmap_name;
  40         void (*get_config)(struct atmel_ebi_dev *ebid,
  41                            struct atmel_ebi_dev_config *conf);
  42         int (*xlate_config)(struct atmel_ebi_dev *ebid,
  43                             struct device_node *configs_np,
  44                             struct atmel_ebi_dev_config *conf);
  45         void (*apply_config)(struct atmel_ebi_dev *ebid,
  46                              struct atmel_ebi_dev_config *conf);
  47 };
  48
  49 struct atmel_ebi {
  50         struct clk *clk;
  51         struct regmap *regmap;
  52         struct  {
  53                 struct regmap *regmap;
  54                 struct clk *clk;
  55                 const struct atmel_hsmc_reg_layout *layout;
  56         } smc;
  57
  58         struct device *dev;
  59         const struct atmel_ebi_caps *caps;
  60         struct list_head devs;
  61 };
  62
  63 struct atmel_smc_timing_xlate {
  64         const char *name;
  65         int (*converter)(struct atmel_smc_cs_conf *conf,
  66                          unsigned int shift, unsigned int nycles);
  67         unsigned int shift;
  68 };
  69
  70 #define ATMEL_SMC_SETUP_XLATE(nm, pos)  \
  71         { .name = nm, .converter = atmel_smc_cs_conf_set_setup, .shift = pos}
  72
  73 #define ATMEL_SMC_PULSE_XLATE(nm, pos)  \
  74         { .name = nm, .converter = atmel_smc_cs_conf_set_pulse, .shift = pos}
  75
  76 #define ATMEL_SMC_CYCLE_XLATE(nm, pos)  \
  77         { .name = nm, .converter = atmel_smc_cs_conf_set_cycle, .shift = pos}
  78
  79 static void at91sam9_ebi_get_config(struct atmel_ebi_dev *ebid,
  80                                     struct atmel_ebi_dev_config *conf)
  81 {
  82         atmel_smc_cs_conf_get(ebid->ebi->smc.regmap, conf->cs,
  83                               &conf->smcconf);
  84 }
  85
  86 static void sama5_ebi_get_config(struct atmel_ebi_dev *ebid,
  87                                  struct atmel_ebi_dev_config *conf)
  88 {
  89         atmel_hsmc_cs_conf_get(ebid->ebi->smc.regmap, ebid->ebi->smc.layout,
  90                                conf->cs, &conf->smcconf);
  91 }
  92
  93 static const struct atmel_smc_timing_xlate timings_xlate_table[] = {
  94         ATMEL_SMC_SETUP_XLATE("atmel,smc-ncs-rd-setup-ns",
  95                               ATMEL_SMC_NCS_RD_SHIFT),
  96         ATMEL_SMC_SETUP_XLATE("atmel,smc-ncs-wr-setup-ns",
  97                               ATMEL_SMC_NCS_WR_SHIFT),
  98         ATMEL_SMC_SETUP_XLATE("atmel,smc-nrd-setup-ns", ATMEL_SMC_NRD_SHIFT),
  99         ATMEL_SMC_SETUP_XLATE("atmel,smc-nwe-setup-ns", ATMEL_SMC_NWE_SHIFT),
 100         ATMEL_SMC_PULSE_XLATE("atmel,smc-ncs-rd-pulse-ns",
 101                               ATMEL_SMC_NCS_RD_SHIFT),
 102         ATMEL_SMC_PULSE_XLATE("atmel,smc-ncs-wr-pulse-ns",
 103                               ATMEL_SMC_NCS_WR_SHIFT),
 104         ATMEL_SMC_PULSE_XLATE("atmel,smc-nrd-pulse-ns", ATMEL_SMC_NRD_SHIFT),
 105         ATMEL_SMC_PULSE_XLATE("atmel,smc-nwe-pulse-ns", ATMEL_SMC_NWE_SHIFT),
 106         ATMEL_SMC_CYCLE_XLATE("atmel,smc-nrd-cycle-ns", ATMEL_SMC_NRD_SHIFT),
 107         ATMEL_SMC_CYCLE_XLATE("atmel,smc-nwe-cycle-ns", ATMEL_SMC_NWE_SHIFT),
 108 };
 109
 110 static int atmel_ebi_xslate_smc_timings(struct atmel_ebi_dev *ebid,
 111                                         struct device_node *np,
 112                                         struct atmel_smc_cs_conf *smcconf)
 113 {
 114         unsigned int clk_rate = clk_get_rate(ebid->ebi->clk);
 115         unsigned int clk_period_ns = NSEC_PER_SEC / clk_rate;
 116         bool required = false;
 117         unsigned int ncycles;
 118         int ret, i;
 119         u32 val;
 120
 121         ret = of_property_read_u32(np, "atmel,smc-tdf-ns", &val);
 122         if (!ret) {
 123                 required = true;
 124                 ncycles = DIV_ROUND_UP(val, clk_period_ns);
 125                 if (ncycles > ATMEL_SMC_MODE_TDF_MAX) {
 126                         ret = -EINVAL;
 127                         goto out;
 128                 }
 129
 130                 if (ncycles < ATMEL_SMC_MODE_TDF_MIN)
 131                         ncycles = ATMEL_SMC_MODE_TDF_MIN;
 132
 133                 smcconf->mode |= ATMEL_SMC_MODE_TDF(ncycles);
 134         }
 135
 136         for (i = 0; i < ARRAY_SIZE(timings_xlate_table); i++) {
 137                 const struct atmel_smc_timing_xlate *xlate;
 138
 139                 xlate = &timings_xlate_table[i];
 140
 141                 ret = of_property_read_u32(np, xlate->name, &val);
 142                 if (ret) {
 143                         if (!required)
 144                                 continue;
 145                         else
 146                                 break;
 147                 }
 148
 149                 if (!required) {
 150                         ret = -EINVAL;
 151                         break;
 152                 }
 153
 154                 ncycles = DIV_ROUND_UP(val, clk_period_ns);
 155                 ret = xlate->converter(smcconf, xlate->shift, ncycles);
 156                 if (ret)
 157                         goto out;
 158         }
 159
 160 out:
 161         if (ret) {
 162                 dev_err(ebid->ebi->dev,
 163                         "missing or invalid timings definition in %pOF",
 164                         np);
 165                 return ret;
 166         }
 167
 168         return required;
 169 }
 170
 171 static int atmel_ebi_xslate_smc_config(struct atmel_ebi_dev *ebid,
 172                                        struct device_node *np,
 173                                        struct atmel_ebi_dev_config *conf)
 174 {
 175         struct atmel_smc_cs_conf *smcconf = &conf->smcconf;
 176         bool required = false;
 177         const char *tmp_str;
 178         u32 tmp;
 179         int ret;
 180
 181         ret = of_property_read_u32(np, "atmel,smc-bus-width", &tmp);
 182         if (!ret) {
 183                 switch (tmp) {
 184                 case 8:
 185                         smcconf->mode |= ATMEL_SMC_MODE_DBW_8;
 186                         break;
 187
 188                 case 16:
 189                         smcconf->mode |= ATMEL_SMC_MODE_DBW_16;
 190                         break;
 191
 192                 case 32:
 193                         smcconf->mode |= ATMEL_SMC_MODE_DBW_32;
 194                         break;
 195
 196                 default:
 197                         return -EINVAL;
 198                 }
 199
 200                 required = true;
 201         }
 202
 203         if (of_property_read_bool(np, "atmel,smc-tdf-optimized")) {
 204                 smcconf->mode |= ATMEL_SMC_MODE_TDFMODE_OPTIMIZED;
 205                 required = true;
 206         }
 207
 208         tmp_str = NULL;
 209         of_property_read_string(np, "atmel,smc-byte-access-type", &tmp_str);
 210         if (tmp_str && !strcmp(tmp_str, "write")) {
 211                 smcconf->mode |= ATMEL_SMC_MODE_BAT_WRITE;
 212                 required = true;
 213         }
 214
 215         tmp_str = NULL;
 216         of_property_read_string(np, "atmel,smc-read-mode", &tmp_str);
 217         if (tmp_str && !strcmp(tmp_str, "nrd")) {
 218                 smcconf->mode |= ATMEL_SMC_MODE_READMODE_NRD;
 219                 required = true;
 220         }
 221
 222         tmp_str = NULL;
 223         of_property_read_string(np, "atmel,smc-write-mode", &tmp_str);
 224         if (tmp_str && !strcmp(tmp_str, "nwe")) {
 225                 smcconf->mode |= ATMEL_SMC_MODE_WRITEMODE_NWE;
 226                 required = true;
 227         }
 228
 229         tmp_str = NULL;
 230         of_property_read_string(np, "atmel,smc-exnw-mode", &tmp_str);
 231         if (tmp_str) {
 232                 if (!strcmp(tmp_str, "frozen"))
 233                         smcconf->mode |= ATMEL_SMC_MODE_EXNWMODE_FROZEN;
 234                 else if (!strcmp(tmp_str, "ready"))
 235                         smcconf->mode |= ATMEL_SMC_MODE_EXNWMODE_READY;
 236                 else if (strcmp(tmp_str, "disabled"))
 237                         return -EINVAL;
 238
 239                 required = true;
 240         }
 241
 242         ret = of_property_read_u32(np, "atmel,smc-page-mode", &tmp);
 243         if (!ret) {
 244                 switch (tmp) {
 245                 case 4:
 246                         smcconf->mode |= ATMEL_SMC_MODE_PS_4;
 247                         break;
 248
 249                 case 8:
 250                         smcconf->mode |= ATMEL_SMC_MODE_PS_8;
 251                         break;
 252
 253                 case 16:
 254                         smcconf->mode |= ATMEL_SMC_MODE_PS_16;
 255                         break;
 256
 257                 case 32:
 258                         smcconf->mode |= ATMEL_SMC_MODE_PS_32;
 259                         break;
 260
 261                 default:
 262                         return -EINVAL;
 263                 }
 264
 265                 smcconf->mode |= ATMEL_SMC_MODE_PMEN;
 266                 required = true;
 267         }
 268
 269         ret = atmel_ebi_xslate_smc_timings(ebid, np, &conf->smcconf);
 270         if (ret < 0)
 271                 return -EINVAL;
 272
 273         if ((ret > 0 && !required) || (!ret && required)) {
 274                 dev_err(ebid->ebi->dev, "missing atmel,smc- properties in %pOF",
 275                         np);
 276                 return -EINVAL;
 277         }
 278
 279         return required;
 280 }
 281
 282 static void at91sam9_ebi_apply_config(struct atmel_ebi_dev *ebid,
 283                                       struct atmel_ebi_dev_config *conf)
 284 {
 285         atmel_smc_cs_conf_apply(ebid->ebi->smc.regmap, conf->cs,
 286                                 &conf->smcconf);
 287 }
 288
 289 static void sama5_ebi_apply_config(struct atmel_ebi_dev *ebid,
 290                                    struct atmel_ebi_dev_config *conf)
 291 {
 292         atmel_hsmc_cs_conf_apply(ebid->ebi->smc.regmap, ebid->ebi->smc.layout,
 293                                  conf->cs, &conf->smcconf);
 294 }
 295
 296 static int atmel_ebi_dev_setup(struct atmel_ebi *ebi, struct device_node *np,
 297                                int reg_cells)
 298 {
 299         const struct atmel_ebi_caps *caps = ebi->caps;
 300         struct atmel_ebi_dev_config conf = { };
 301         struct device *dev = ebi->dev;
 302         struct atmel_ebi_dev *ebid;
 303         unsigned long cslines = 0;
 304         int ret, numcs = 0, nentries, i;
 305         bool apply = false;
 306         u32 cs;
 307
 308         nentries = of_property_count_elems_of_size(np, "reg",
 309                                                    reg_cells * sizeof(u32));
 310         for (i = 0; i < nentries; i++) {
 311                 ret = of_property_read_u32_index(np, "reg", i * reg_cells,
 312                                                  &cs);
 313                 if (ret)
 314                         return ret;
 315
 316                 if (cs >= AT91_EBI_NUM_CS ||
 317                     !(ebi->caps->available_cs & BIT(cs))) {
 318                         dev_err(dev, "invalid reg property in %pOF\n", np);
 319                         return -EINVAL;
 320                 }
 321
 322                 if (!test_and_set_bit(cs, &cslines))
 323                         numcs++;
 324         }
 325
 326         if (!numcs) {
 327                 dev_err(dev, "invalid reg property in %pOF\n", np);
 328                 return -EINVAL;
 329         }
 330
 331         ebid = devm_kzalloc(ebi->dev, struct_size(ebid, configs, numcs),
 332                             GFP_KERNEL);
 333         if (!ebid)
 334                 return -ENOMEM;
 335
 336         ebid->ebi = ebi;
 337         ebid->numcs = numcs;
 338
 339         ret = caps->xlate_config(ebid, np, &conf);
 340         if (ret < 0)
 341                 return ret;
 342         else if (ret)
 343                 apply = true;
 344
 345         i = 0;
 346         for_each_set_bit(cs, &cslines, AT91_EBI_NUM_CS) {
 347                 ebid->configs[i].cs = cs;
 348
 349                 if (apply) {
 350                         conf.cs = cs;
 351                         caps->apply_config(ebid, &conf);
 352                 }
 353
 354                 caps->get_config(ebid, &ebid->configs[i]);
 355
 356                 /*
 357                  * Attach the EBI device to the generic SMC logic if at least
 358                  * one "atmel,smc-" property is present.
 359                  */
 360                 if (ebi->caps->ebi_csa_offs && apply)
 361                         regmap_update_bits(ebi->regmap,
 362                                            ebi->caps->ebi_csa_offs,
 363                                            BIT(cs), 0);
 364
 365                 i++;
 366         }
 367
 368         list_add_tail(&ebid->node, &ebi->devs);
 369
 370         return 0;
 371 }
 372
 373 static const struct atmel_ebi_caps at91sam9260_ebi_caps = {
 374         .available_cs = 0xff,
 375         .ebi_csa_offs = AT91SAM9260_MATRIX_EBICSA,
 376         .regmap_name = "atmel,matrix",
 377         .get_config = at91sam9_ebi_get_config,
 378         .xlate_config = atmel_ebi_xslate_smc_config,
 379         .apply_config = at91sam9_ebi_apply_config,
 380 };
 381
 382 static const struct atmel_ebi_caps at91sam9261_ebi_caps = {
 383         .available_cs = 0xff,
 384         .ebi_csa_offs = AT91SAM9261_MATRIX_EBICSA,
 385         .regmap_name = "atmel,matrix",
 386         .get_config = at91sam9_ebi_get_config,
 387         .xlate_config = atmel_ebi_xslate_smc_config,
 388         .apply_config = at91sam9_ebi_apply_config,
 389 };
 390
 391 static const struct atmel_ebi_caps at91sam9263_ebi0_caps = {
 392         .available_cs = 0x3f,
 393         .ebi_csa_offs = AT91SAM9263_MATRIX_EBI0CSA,
 394         .regmap_name = "atmel,matrix",
 395         .get_config = at91sam9_ebi_get_config,
 396         .xlate_config = atmel_ebi_xslate_smc_config,
 397         .apply_config = at91sam9_ebi_apply_config,
 398 };
 399
 400 static const struct atmel_ebi_caps at91sam9263_ebi1_caps = {
 401         .available_cs = 0x7,
 402         .ebi_csa_offs = AT91SAM9263_MATRIX_EBI1CSA,
 403         .regmap_name = "atmel,matrix",
 404         .get_config = at91sam9_ebi_get_config,
 405         .xlate_config = atmel_ebi_xslate_smc_config,
 406         .apply_config = at91sam9_ebi_apply_config,
 407 };
 408
 409 static const struct atmel_ebi_caps at91sam9rl_ebi_caps = {
 410         .available_cs = 0x3f,
 411         .ebi_csa_offs = AT91SAM9RL_MATRIX_EBICSA,
 412         .regmap_name = "atmel,matrix",
 413         .get_config = at91sam9_ebi_get_config,
 414         .xlate_config = atmel_ebi_xslate_smc_config,
 415         .apply_config = at91sam9_ebi_apply_config,
 416 };
 417
 418 static const struct atmel_ebi_caps at91sam9g45_ebi_caps = {
 419         .available_cs = 0x3f,
 420         .ebi_csa_offs = AT91SAM9G45_MATRIX_EBICSA,
 421         .regmap_name = "atmel,matrix",
 422         .get_config = at91sam9_ebi_get_config,
 423         .xlate_config = atmel_ebi_xslate_smc_config,
 424         .apply_config = at91sam9_ebi_apply_config,
 425 };
 426
 427 static const struct atmel_ebi_caps at91sam9x5_ebi_caps = {
 428         .available_cs = 0x3f,
 429         .ebi_csa_offs = AT91SAM9X5_MATRIX_EBICSA,
 430         .regmap_name = "atmel,matrix",
 431         .get_config = at91sam9_ebi_get_config,
 432         .xlate_config = atmel_ebi_xslate_smc_config,
 433         .apply_config = at91sam9_ebi_apply_config,
 434 };
 435
 436 static const struct atmel_ebi_caps sama5d3_ebi_caps = {
 437         .available_cs = 0xf,
 438         .get_config = sama5_ebi_get_config,
 439         .xlate_config = atmel_ebi_xslate_smc_config,
 440         .apply_config = sama5_ebi_apply_config,
 441 };
 442
 443 static const struct atmel_ebi_caps sam9x60_ebi_caps = {
 444         .available_cs = 0x3f,
 445         .ebi_csa_offs = AT91_SFR_CCFG_EBICSA,
 446         .regmap_name = "microchip,sfr",
 447         .get_config = at91sam9_ebi_get_config,
 448         .xlate_config = atmel_ebi_xslate_smc_config,
 449         .apply_config = at91sam9_ebi_apply_config,
 450 };
 451
 452 static const struct of_device_id atmel_ebi_id_table[] = {
 453         {
 454                 .compatible = "atmel,at91sam9260-ebi",
 455                 .data = &at91sam9260_ebi_caps,
 456         },
 457         {
 458                 .compatible = "atmel,at91sam9261-ebi",
 459                 .data = &at91sam9261_ebi_caps,
 460         },
 461         {
 462                 .compatible = "atmel,at91sam9263-ebi0",
 463                 .data = &at91sam9263_ebi0_caps,
 464         },
 465         {
 466                 .compatible = "atmel,at91sam9263-ebi1",
 467                 .data = &at91sam9263_ebi1_caps,
 468         },
 469         {
 470                 .compatible = "atmel,at91sam9rl-ebi",
 471                 .data = &at91sam9rl_ebi_caps,
 472         },
 473         {
 474                 .compatible = "atmel,at91sam9g45-ebi",
 475                 .data = &at91sam9g45_ebi_caps,
 476         },
 477         {
 478                 .compatible = "atmel,at91sam9x5-ebi",
 479                 .data = &at91sam9x5_ebi_caps,
 480         },
 481         {
 482                 .compatible = "atmel,sama5d3-ebi",
 483                 .data = &sama5d3_ebi_caps,
 484         },
 485         {
 486                 .compatible = "microchip,sam9x60-ebi",
 487                 .data = &sam9x60_ebi_caps,
 488         },
 489         { /* sentinel */ }
 490 };
 491
 492 static int atmel_ebi_dev_disable(struct atmel_ebi *ebi, struct device_node *np)
 493 {
 494         struct device *dev = ebi->dev;
 495         struct property *newprop;
 496
 497         newprop = devm_kzalloc(dev, sizeof(*newprop), GFP_KERNEL);
 498         if (!newprop)
 499                 return -ENOMEM;
 500
 501         newprop->name = devm_kstrdup(dev, "status", GFP_KERNEL);
 502         if (!newprop->name)
 503                 return -ENOMEM;
 504
 505         newprop->value = devm_kstrdup(dev, "disabled", GFP_KERNEL);
 506         if (!newprop->value)
 507                 return -ENOMEM;
 508
 509         newprop->length = sizeof("disabled");
 510
 511         return of_update_property(np, newprop);
 512 }
 513
 514 static int atmel_ebi_probe(struct platform_device *pdev)
 515 {
 516         struct device *dev = &pdev->dev;
 517         struct device_node *child, *np = dev->of_node, *smc_np;
 518         const struct of_device_id *match;
 519         struct atmel_ebi *ebi;
 520         int ret, reg_cells;
 521         struct clk *clk;
 522         u32 val;
 523
 524         match = of_match_device(atmel_ebi_id_table, dev);
 525         if (!match || !match->data)
 526                 return -EINVAL;
 527
 528         ebi = devm_kzalloc(dev, sizeof(*ebi), GFP_KERNEL);
 529         if (!ebi)
 530                 return -ENOMEM;
 531
 532         platform_set_drvdata(pdev, ebi);
 533
 534         INIT_LIST_HEAD(&ebi->devs);
 535         ebi->caps = match->data;
 536         ebi->dev = dev;
 537
 538         clk = devm_clk_get(dev, NULL);
 539         if (IS_ERR(clk))
 540                 return PTR_ERR(clk);
 541
 542         ebi->clk = clk;
 543
 544         smc_np = of_parse_phandle(dev->of_node, "atmel,smc", 0);
 545
 546         ebi->smc.regmap = syscon_node_to_regmap(smc_np);
 547         if (IS_ERR(ebi->smc.regmap)) {
 548                 ret = PTR_ERR(ebi->smc.regmap);
 549                 goto put_node;
 550         }
 551
 552         ebi->smc.layout = atmel_hsmc_get_reg_layout(smc_np);
 553         if (IS_ERR(ebi->smc.layout)) {
 554                 ret = PTR_ERR(ebi->smc.layout);
 555                 goto put_node;
 556         }
 557
 558         ebi->smc.clk = of_clk_get(smc_np, 0);
 559         if (IS_ERR(ebi->smc.clk)) {
 560                 if (PTR_ERR(ebi->smc.clk) != -ENOENT) {
 561                         ret = PTR_ERR(ebi->smc.clk);
 562                         goto put_node;
 563                 }
 564
 565                 ebi->smc.clk = NULL;
 566         }
 567         of_node_put(smc_np);
 568         ret = clk_prepare_enable(ebi->smc.clk);
 569         if (ret)
 570                 return ret;
 571
 572         /*
 573          * The sama5d3 does not provide an EBICSA register and thus does need
 574          * to access it.
 575          */
 576         if (ebi->caps->ebi_csa_offs) {
 577                 ebi->regmap =
 578                         syscon_regmap_lookup_by_phandle(np,
 579                                                         ebi->caps->regmap_name);
 580                 if (IS_ERR(ebi->regmap))
 581                         return PTR_ERR(ebi->regmap);
 582         }
 583
 584         ret = of_property_read_u32(np, "#address-cells", &val);
 585         if (ret) {
 586                 dev_err(dev, "missing #address-cells property\n");
 587                 return ret;
 588         }
 589
 590         reg_cells = val;
 591
 592         ret = of_property_read_u32(np, "#size-cells", &val);
 593         if (ret) {
 594                 dev_err(dev, "missing #address-cells property\n");
 595                 return ret;
 596         }
 597
 598         reg_cells += val;
 599
 600         for_each_available_child_of_node(np, child) {
 601                 if (!of_find_property(child, "reg", NULL))
 602                         continue;
 603
 604                 ret = atmel_ebi_dev_setup(ebi, child, reg_cells);
 605                 if (ret) {
 606                         dev_err(dev, "failed to configure EBI bus for %pOF, disabling the device",
 607                                 child);
 608
 609                         ret = atmel_ebi_dev_disable(ebi, child);
 610                         if (ret) {
 611                                 of_node_put(child);
 612                                 return ret;
 613                         }
 614                 }
 615         }
 616
 617         return of_platform_populate(np, NULL, NULL, dev);
 618
 619 put_node:
 620         of_node_put(smc_np);
 621         return ret;
 622 }
 623
 624 static __maybe_unused int atmel_ebi_resume(struct device *dev)
 625 {
 626         struct atmel_ebi *ebi = dev_get_drvdata(dev);
 627         struct atmel_ebi_dev *ebid;
 628
 629         list_for_each_entry(ebid, &ebi->devs, node) {
 630                 int i;
 631
 632                 for (i = 0; i < ebid->numcs; i++)
 633                         ebid->ebi->caps->apply_config(ebid, &ebid->configs[i]);
 634         }
 635
 636         return 0;
 637 }
 638
 639 static SIMPLE_DEV_PM_OPS(atmel_ebi_pm_ops, NULL, atmel_ebi_resume);
 640
 641 static struct platform_driver atmel_ebi_driver = {
 642         .driver = {
 643                 .name = "atmel-ebi",
 644                 .of_match_table = atmel_ebi_id_table,
 645                 .pm = &atmel_ebi_pm_ops,
 646         },
 647 };
 648 builtin_platform_driver_probe(atmel_ebi_driver, atmel_ebi_probe);