root/drivers/clk/keystone/sci-clk.c

DEFINITIONS

1. sci_clk_prepare
2. sci_clk_unprepare
3. sci_clk_is_prepared
4. sci_clk_recalc_rate
5. sci_clk_determine_rate
6. sci_clk_set_rate
7. sci_clk_get_parent
8. sci_clk_set_parent
9. _sci_clk_build
10. _cmp_sci_clk
11. sci_clk_get
12. ti_sci_init_clocks
13. ti_sci_scan_clocks_from_fw
14. _cmp_sci_clk_list
15. ti_sci_scan_clocks_from_dt
16. ti_sci_clk_probe
17. ti_sci_clk_remove

   1 /*
   2  * SCI Clock driver for keystone based devices
   3  *
   4  * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
   5  *      Tero Kristo <t-kristo@ti.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  12  * kind, whether express or implied; without even the implied warranty
  13  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16 #include <linux/clk-provider.h>
  17 #include <linux/err.h>
  18 #include <linux/io.h>
  19 #include <linux/module.h>
  20 #include <linux/of_address.h>
  21 #include <linux/of_device.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/slab.h>
  24 #include <linux/soc/ti/ti_sci_protocol.h>
  25 #include <linux/bsearch.h>
  26 #include <linux/list_sort.h>
  27 
  28 #define SCI_CLK_SSC_ENABLE              BIT(0)
  29 #define SCI_CLK_ALLOW_FREQ_CHANGE       BIT(1)
  30 #define SCI_CLK_INPUT_TERMINATION       BIT(2)
  31 
  32 /**
  33  * struct sci_clk_provider - TI SCI clock provider representation
  34  * @sci: Handle to the System Control Interface protocol handler
  35  * @ops: Pointer to the SCI ops to be used by the clocks
  36  * @dev: Device pointer for the clock provider
  37  * @clocks: Clocks array for this device
  38  * @num_clocks: Total number of clocks for this provider
  39  */
  40 struct sci_clk_provider {
  41         const struct ti_sci_handle *sci;
  42         const struct ti_sci_clk_ops *ops;
  43         struct device *dev;
  44         struct sci_clk **clocks;
  45         int num_clocks;
  46 };
  47 
  48 /**
  49  * struct sci_clk - TI SCI clock representation
  50  * @hw:          Hardware clock cookie for common clock framework
  51  * @dev_id:      Device index
  52  * @clk_id:      Clock index
  53  * @num_parents: Number of parents for this clock
  54  * @provider:    Master clock provider
  55  * @flags:       Flags for the clock
  56  * @node:        Link for handling clocks probed via DT
  57  */
  58 struct sci_clk {
  59         struct clk_hw hw;
  60         u16 dev_id;
  61         u32 clk_id;
  62         u32 num_parents;
  63         struct sci_clk_provider *provider;
  64         u8 flags;
  65         struct list_head node;
  66 };
  67 
  68 #define to_sci_clk(_hw) container_of(_hw, struct sci_clk, hw)
  69 
  70 /**
  71  * sci_clk_prepare - Prepare (enable) a TI SCI clock
  72  * @hw: clock to prepare
  73  *
  74  * Prepares a clock to be actively used. Returns the SCI protocol status.
  75  */
  76 static int sci_clk_prepare(struct clk_hw *hw)
  77 {
  78         struct sci_clk *clk = to_sci_clk(hw);
  79         bool enable_ssc = clk->flags & SCI_CLK_SSC_ENABLE;
  80         bool allow_freq_change = clk->flags & SCI_CLK_ALLOW_FREQ_CHANGE;
  81         bool input_termination = clk->flags & SCI_CLK_INPUT_TERMINATION;
  82 
  83         return clk->provider->ops->get_clock(clk->provider->sci, clk->dev_id,
  84                                              clk->clk_id, enable_ssc,
  85                                              allow_freq_change,
  86                                              input_termination);
  87 }
  88 
  89 /**
  90  * sci_clk_unprepare - Un-prepares (disables) a TI SCI clock
  91  * @hw: clock to unprepare
  92  *
  93  * Un-prepares a clock from active state.
  94  */
  95 static void sci_clk_unprepare(struct clk_hw *hw)
  96 {
  97         struct sci_clk *clk = to_sci_clk(hw);
  98         int ret;
  99 
 100         ret = clk->provider->ops->put_clock(clk->provider->sci, clk->dev_id,
 101                                             clk->clk_id);
 102         if (ret)
 103                 dev_err(clk->provider->dev,
 104                         "unprepare failed for dev=%d, clk=%d, ret=%d\n",
 105                         clk->dev_id, clk->clk_id, ret);
 106 }
 107 
 108 /**
 109  * sci_clk_is_prepared - Check if a TI SCI clock is prepared or not
 110  * @hw: clock to check status for
 111  *
 112  * Checks if a clock is prepared (enabled) in hardware. Returns non-zero
 113  * value if clock is enabled, zero otherwise.
 114  */
 115 static int sci_clk_is_prepared(struct clk_hw *hw)
 116 {
 117         struct sci_clk *clk = to_sci_clk(hw);
 118         bool req_state, current_state;
 119         int ret;
 120 
 121         ret = clk->provider->ops->is_on(clk->provider->sci, clk->dev_id,
 122                                         clk->clk_id, &req_state,
 123                                         &current_state);
 124         if (ret) {
 125                 dev_err(clk->provider->dev,
 126                         "is_prepared failed for dev=%d, clk=%d, ret=%d\n",
 127                         clk->dev_id, clk->clk_id, ret);
 128                 return 0;
 129         }
 130 
 131         return req_state;
 132 }
 133 
 134 /**
 135  * sci_clk_recalc_rate - Get clock rate for a TI SCI clock
 136  * @hw: clock to get rate for
 137  * @parent_rate: parent rate provided by common clock framework, not used
 138  *
 139  * Gets the current clock rate of a TI SCI clock. Returns the current
 140  * clock rate, or zero in failure.
 141  */
 142 static unsigned long sci_clk_recalc_rate(struct clk_hw *hw,
 143                                          unsigned long parent_rate)
 144 {
 145         struct sci_clk *clk = to_sci_clk(hw);
 146         u64 freq;
 147         int ret;
 148 
 149         ret = clk->provider->ops->get_freq(clk->provider->sci, clk->dev_id,
 150                                            clk->clk_id, &freq);
 151         if (ret) {
 152                 dev_err(clk->provider->dev,
 153                         "recalc-rate failed for dev=%d, clk=%d, ret=%d\n",
 154                         clk->dev_id, clk->clk_id, ret);
 155                 return 0;
 156         }
 157 
 158         return freq;
 159 }
 160 
 161 /**
 162  * sci_clk_determine_rate - Determines a clock rate a clock can be set to
 163  * @hw: clock to change rate for
 164  * @req: requested rate configuration for the clock
 165  *
 166  * Determines a suitable clock rate and parent for a TI SCI clock.
 167  * The parent handling is un-used, as generally the parent clock rates
 168  * are not known by the kernel; instead these are internally handled
 169  * by the firmware. Returns 0 on success, negative error value on failure.
 170  */
 171 static int sci_clk_determine_rate(struct clk_hw *hw,
 172                                   struct clk_rate_request *req)
 173 {
 174         struct sci_clk *clk = to_sci_clk(hw);
 175         int ret;
 176         u64 new_rate;
 177 
 178         ret = clk->provider->ops->get_best_match_freq(clk->provider->sci,
 179                                                       clk->dev_id,
 180                                                       clk->clk_id,
 181                                                       req->min_rate,
 182                                                       req->rate,
 183                                                       req->max_rate,
 184                                                       &new_rate);
 185         if (ret) {
 186                 dev_err(clk->provider->dev,
 187                         "determine-rate failed for dev=%d, clk=%d, ret=%d\n",
 188                         clk->dev_id, clk->clk_id, ret);
 189                 return ret;
 190         }
 191 
 192         req->rate = new_rate;
 193 
 194         return 0;
 195 }
 196 
 197 /**
 198  * sci_clk_set_rate - Set rate for a TI SCI clock
 199  * @hw: clock to change rate for
 200  * @rate: target rate for the clock
 201  * @parent_rate: rate of the clock parent, not used for TI SCI clocks
 202  *
 203  * Sets a clock frequency for a TI SCI clock. Returns the TI SCI
 204  * protocol status.
 205  */
 206 static int sci_clk_set_rate(struct clk_hw *hw, unsigned long rate,
 207                             unsigned long parent_rate)
 208 {
 209         struct sci_clk *clk = to_sci_clk(hw);
 210 
 211         return clk->provider->ops->set_freq(clk->provider->sci, clk->dev_id,
 212                                             clk->clk_id, rate, rate, rate);
 213 }
 214 
 215 /**
 216  * sci_clk_get_parent - Get the current parent of a TI SCI clock
 217  * @hw: clock to get parent for
 218  *
 219  * Returns the index of the currently selected parent for a TI SCI clock.
 220  */
 221 static u8 sci_clk_get_parent(struct clk_hw *hw)
 222 {
 223         struct sci_clk *clk = to_sci_clk(hw);
 224         u32 parent_id = 0;
 225         int ret;
 226 
 227         ret = clk->provider->ops->get_parent(clk->provider->sci, clk->dev_id,
 228                                              clk->clk_id, (void *)&parent_id);
 229         if (ret) {
 230                 dev_err(clk->provider->dev,
 231                         "get-parent failed for dev=%d, clk=%d, ret=%d\n",
 232                         clk->dev_id, clk->clk_id, ret);
 233                 return 0;
 234         }
 235 
 236         parent_id = parent_id - clk->clk_id - 1;
 237 
 238         return (u8)parent_id;
 239 }
 240 
 241 /**
 242  * sci_clk_set_parent - Set the parent of a TI SCI clock
 243  * @hw: clock to set parent for
 244  * @index: new parent index for the clock
 245  *
 246  * Sets the parent of a TI SCI clock. Return TI SCI protocol status.
 247  */
 248 static int sci_clk_set_parent(struct clk_hw *hw, u8 index)
 249 {
 250         struct sci_clk *clk = to_sci_clk(hw);
 251 
 252         return clk->provider->ops->set_parent(clk->provider->sci, clk->dev_id,
 253                                               clk->clk_id,
 254                                               index + 1 + clk->clk_id);
 255 }
 256 
 257 static const struct clk_ops sci_clk_ops = {
 258         .prepare = sci_clk_prepare,
 259         .unprepare = sci_clk_unprepare,
 260         .is_prepared = sci_clk_is_prepared,
 261         .recalc_rate = sci_clk_recalc_rate,
 262         .determine_rate = sci_clk_determine_rate,
 263         .set_rate = sci_clk_set_rate,
 264         .get_parent = sci_clk_get_parent,
 265         .set_parent = sci_clk_set_parent,
 266 };
 267 
 268 /**
 269  * _sci_clk_get - Gets a handle for an SCI clock
 270  * @provider: Handle to SCI clock provider
 271  * @sci_clk: Handle to the SCI clock to populate
 272  *
 273  * Gets a handle to an existing TI SCI hw clock, or builds a new clock
 274  * entry and registers it with the common clock framework. Called from
 275  * the common clock framework, when a corresponding of_clk_get call is
 276  * executed, or recursively from itself when parsing parent clocks.
 277  * Returns 0 on success, negative error code on failure.
 278  */
 279 static int _sci_clk_build(struct sci_clk_provider *provider,
 280                           struct sci_clk *sci_clk)
 281 {
 282         struct clk_init_data init = { NULL };
 283         char *name = NULL;
 284         char **parent_names = NULL;
 285         int i;
 286         int ret = 0;
 287 
 288         name = kasprintf(GFP_KERNEL, "clk:%d:%d", sci_clk->dev_id,
 289                          sci_clk->clk_id);
 290 
 291         init.name = name;
 292 
 293         /*
 294          * From kernel point of view, we only care about a clocks parents,
 295          * if it has more than 1 possible parent. In this case, it is going
 296          * to have mux functionality. Otherwise it is going to act as a root
 297          * clock.
 298          */
 299         if (sci_clk->num_parents < 2)
 300                 sci_clk->num_parents = 0;
 301 
 302         if (sci_clk->num_parents) {
 303                 parent_names = kcalloc(sci_clk->num_parents, sizeof(char *),
 304                                        GFP_KERNEL);
 305 
 306                 if (!parent_names) {
 307                         ret = -ENOMEM;
 308                         goto err;
 309                 }
 310 
 311                 for (i = 0; i < sci_clk->num_parents; i++) {
 312                         char *parent_name;
 313 
 314                         parent_name = kasprintf(GFP_KERNEL, "clk:%d:%d",
 315                                                 sci_clk->dev_id,
 316                                                 sci_clk->clk_id + 1 + i);
 317                         if (!parent_name) {
 318                                 ret = -ENOMEM;
 319                                 goto err;
 320                         }
 321                         parent_names[i] = parent_name;
 322                 }
 323                 init.parent_names = (void *)parent_names;
 324         }
 325 
 326         init.ops = &sci_clk_ops;
 327         init.num_parents = sci_clk->num_parents;
 328         sci_clk->hw.init = &init;
 329 
 330         ret = devm_clk_hw_register(provider->dev, &sci_clk->hw);
 331         if (ret)
 332                 dev_err(provider->dev, "failed clk register with %d\n", ret);
 333 
 334 err:
 335         if (parent_names) {
 336                 for (i = 0; i < sci_clk->num_parents; i++)
 337                         kfree(parent_names[i]);
 338 
 339                 kfree(parent_names);
 340         }
 341 
 342         kfree(name);
 343 
 344         return ret;
 345 }
 346 
 347 static int _cmp_sci_clk(const void *a, const void *b)
 348 {
 349         const struct sci_clk *ca = a;
 350         const struct sci_clk *cb = *(struct sci_clk **)b;
 351 
 352         if (ca->dev_id == cb->dev_id && ca->clk_id == cb->clk_id)
 353                 return 0;
 354         if (ca->dev_id > cb->dev_id ||
 355             (ca->dev_id == cb->dev_id && ca->clk_id > cb->clk_id))
 356                 return 1;
 357         return -1;
 358 }
 359 
 360 /**
 361  * sci_clk_get - Xlate function for getting clock handles
 362  * @clkspec: device tree clock specifier
 363  * @data: pointer to the clock provider
 364  *
 365  * Xlate function for retrieving clock TI SCI hw clock handles based on
 366  * device tree clock specifier. Called from the common clock framework,
 367  * when a corresponding of_clk_get call is executed. Returns a pointer
 368  * to the TI SCI hw clock struct, or ERR_PTR value in failure.
 369  */
 370 static struct clk_hw *sci_clk_get(struct of_phandle_args *clkspec, void *data)
 371 {
 372         struct sci_clk_provider *provider = data;
 373         struct sci_clk **clk;
 374         struct sci_clk key;
 375 
 376         if (clkspec->args_count != 2)
 377                 return ERR_PTR(-EINVAL);
 378 
 379         key.dev_id = clkspec->args[0];
 380         key.clk_id = clkspec->args[1];
 381 
 382         clk = bsearch(&key, provider->clocks, provider->num_clocks,
 383                       sizeof(clk), _cmp_sci_clk);
 384 
 385         if (!clk)
 386                 return ERR_PTR(-ENODEV);
 387 
 388         return &(*clk)->hw;
 389 }
 390 
 391 static int ti_sci_init_clocks(struct sci_clk_provider *p)
 392 {
 393         int i;
 394         int ret;
 395 
 396         for (i = 0; i < p->num_clocks; i++) {
 397                 ret = _sci_clk_build(p, p->clocks[i]);
 398                 if (ret)
 399                         return ret;
 400         }
 401 
 402         return 0;
 403 }
 404 
 405 static const struct of_device_id ti_sci_clk_of_match[] = {
 406         { .compatible = "ti,k2g-sci-clk" },
 407         { /* Sentinel */ },
 408 };
 409 MODULE_DEVICE_TABLE(of, ti_sci_clk_of_match);
 410 
 411 #ifdef CONFIG_TI_SCI_CLK_PROBE_FROM_FW
 412 static int ti_sci_scan_clocks_from_fw(struct sci_clk_provider *provider)
 413 {
 414         int ret;
 415         int num_clks = 0;
 416         struct sci_clk **clks = NULL;
 417         struct sci_clk **tmp_clks;
 418         struct sci_clk *sci_clk;
 419         int max_clks = 0;
 420         int clk_id = 0;
 421         int dev_id = 0;
 422         u32 num_parents = 0;
 423         int gap_size = 0;
 424         struct device *dev = provider->dev;
 425 
 426         while (1) {
 427                 ret = provider->ops->get_num_parents(provider->sci, dev_id,
 428                                                      clk_id,
 429                                                      (void *)&num_parents);
 430                 if (ret) {
 431                         gap_size++;
 432                         if (!clk_id) {
 433                                 if (gap_size >= 5)
 434                                         break;
 435                                 dev_id++;
 436                         } else {
 437                                 if (gap_size >= 2) {
 438                                         dev_id++;
 439                                         clk_id = 0;
 440                                         gap_size = 0;
 441                                 } else {
 442                                         clk_id++;
 443                                 }
 444                         }
 445                         continue;
 446                 }
 447 
 448                 gap_size = 0;
 449 
 450                 if (num_clks == max_clks) {
 451                         tmp_clks = devm_kmalloc_array(dev, max_clks + 64,
 452                                                       sizeof(sci_clk),
 453                                                       GFP_KERNEL);
 454                         memcpy(tmp_clks, clks, max_clks * sizeof(sci_clk));
 455                         if (max_clks)
 456                                 devm_kfree(dev, clks);
 457                         max_clks += 64;
 458                         clks = tmp_clks;
 459                 }
 460 
 461                 sci_clk = devm_kzalloc(dev, sizeof(*sci_clk), GFP_KERNEL);
 462                 if (!sci_clk)
 463                         return -ENOMEM;
 464                 sci_clk->dev_id = dev_id;
 465                 sci_clk->clk_id = clk_id;
 466                 sci_clk->provider = provider;
 467                 sci_clk->num_parents = num_parents;
 468 
 469                 clks[num_clks] = sci_clk;
 470 
 471                 clk_id++;
 472                 num_clks++;
 473         }
 474 
 475         provider->clocks = devm_kmalloc_array(dev, num_clks, sizeof(sci_clk),
 476                                               GFP_KERNEL);
 477         if (!provider->clocks)
 478                 return -ENOMEM;
 479 
 480         memcpy(provider->clocks, clks, num_clks * sizeof(sci_clk));
 481 
 482         provider->num_clocks = num_clks;
 483 
 484         devm_kfree(dev, clks);
 485 
 486         return 0;
 487 }
 488 
 489 #else
 490 
 491 static int _cmp_sci_clk_list(void *priv, struct list_head *a,
 492                              struct list_head *b)
 493 {
 494         struct sci_clk *ca = container_of(a, struct sci_clk, node);
 495         struct sci_clk *cb = container_of(b, struct sci_clk, node);
 496 
 497         return _cmp_sci_clk(ca, &cb);
 498 }
 499 
 500 static int ti_sci_scan_clocks_from_dt(struct sci_clk_provider *provider)
 501 {
 502         struct device *dev = provider->dev;
 503         struct device_node *np = NULL;
 504         int ret;
 505         int index;
 506         struct of_phandle_args args;
 507         struct list_head clks;
 508         struct sci_clk *sci_clk, *prev;
 509         int num_clks = 0;
 510         int num_parents;
 511         int clk_id;
 512         const char * const clk_names[] = {
 513                 "clocks", "assigned-clocks", "assigned-clock-parents", NULL
 514         };
 515         const char * const *clk_name;
 516 
 517         INIT_LIST_HEAD(&clks);
 518 
 519         clk_name = clk_names;
 520 
 521         while (*clk_name) {
 522                 np = of_find_node_with_property(np, *clk_name);
 523                 if (!np) {
 524                         clk_name++;
 525                         break;
 526                 }
 527 
 528                 if (!of_device_is_available(np))
 529                         continue;
 530 
 531                 index = 0;
 532 
 533                 do {
 534                         ret = of_parse_phandle_with_args(np, *clk_name,
 535                                                          "#clock-cells", index,
 536                                                          &args);
 537                         if (ret)
 538                                 break;
 539 
 540                         if (args.args_count == 2 && args.np == dev->of_node) {
 541                                 sci_clk = devm_kzalloc(dev, sizeof(*sci_clk),
 542                                                        GFP_KERNEL);
 543                                 if (!sci_clk)
 544                                         return -ENOMEM;
 545 
 546                                 sci_clk->dev_id = args.args[0];
 547                                 sci_clk->clk_id = args.args[1];
 548                                 sci_clk->provider = provider;
 549                                 provider->ops->get_num_parents(provider->sci,
 550                                                                sci_clk->dev_id,
 551                                                                sci_clk->clk_id,
 552                                                                (void *)&sci_clk->num_parents);
 553                                 list_add_tail(&sci_clk->node, &clks);
 554 
 555                                 num_clks++;
 556 
 557                                 num_parents = sci_clk->num_parents;
 558                                 if (num_parents == 1)
 559                                         num_parents = 0;
 560 
 561                                 /*
 562                                  * Linux kernel has inherent limitation
 563                                  * of 255 clock parents at the moment.
 564                                  * Right now, it is not expected that
 565                                  * any mux clock from sci-clk driver
 566                                  * would exceed that limit either, but
 567                                  * the ABI basically provides that
 568                                  * possibility. Print out a warning if
 569                                  * this happens for any clock.
 570                                  */
 571                                 if (num_parents >= 255) {
 572                                         dev_warn(dev, "too many parents for dev=%d, clk=%d (%d), cropping to 255.\n",
 573                                                  sci_clk->dev_id,
 574                                                  sci_clk->clk_id, num_parents);
 575                                         num_parents = 255;
 576                                 }
 577 
 578                                 clk_id = args.args[1] + 1;
 579 
 580                                 while (num_parents--) {
 581                                         sci_clk = devm_kzalloc(dev,
 582                                                                sizeof(*sci_clk),
 583                                                                GFP_KERNEL);
 584                                         if (!sci_clk)
 585                                                 return -ENOMEM;
 586                                         sci_clk->dev_id = args.args[0];
 587                                         sci_clk->clk_id = clk_id++;
 588                                         sci_clk->provider = provider;
 589                                         list_add_tail(&sci_clk->node, &clks);
 590 
 591                                         num_clks++;
 592                                 }
 593                         }
 594 
 595                         index++;
 596                 } while (args.np);
 597         }
 598 
 599         list_sort(NULL, &clks, _cmp_sci_clk_list);
 600 
 601         provider->clocks = devm_kmalloc_array(dev, num_clks, sizeof(sci_clk),
 602                                               GFP_KERNEL);
 603         if (!provider->clocks)
 604                 return -ENOMEM;
 605 
 606         num_clks = 0;
 607         prev = NULL;
 608 
 609         list_for_each_entry(sci_clk, &clks, node) {
 610                 if (prev && prev->dev_id == sci_clk->dev_id &&
 611                     prev->clk_id == sci_clk->clk_id)
 612                         continue;
 613 
 614                 provider->clocks[num_clks++] = sci_clk;
 615                 prev = sci_clk;
 616         }
 617 
 618         provider->num_clocks = num_clks;
 619 
 620         return 0;
 621 }
 622 #endif
 623 
 624 /**
 625  * ti_sci_clk_probe - Probe function for the TI SCI clock driver
 626  * @pdev: platform device pointer to be probed
 627  *
 628  * Probes the TI SCI clock device. Allocates a new clock provider
 629  * and registers this to the common clock framework. Also applies
 630  * any required flags to the identified clocks via clock lists
 631  * supplied from DT. Returns 0 for success, negative error value
 632  * for failure.
 633  */
 634 static int ti_sci_clk_probe(struct platform_device *pdev)
 635 {
 636         struct device *dev = &pdev->dev;
 637         struct device_node *np = dev->of_node;
 638         struct sci_clk_provider *provider;
 639         const struct ti_sci_handle *handle;
 640         int ret;
 641 
 642         handle = devm_ti_sci_get_handle(dev);
 643         if (IS_ERR(handle))
 644                 return PTR_ERR(handle);
 645 
 646         provider = devm_kzalloc(dev, sizeof(*provider), GFP_KERNEL);
 647         if (!provider)
 648                 return -ENOMEM;
 649 
 650         provider->sci = handle;
 651         provider->ops = &handle->ops.clk_ops;
 652         provider->dev = dev;
 653 
 654 #ifdef CONFIG_TI_SCI_CLK_PROBE_FROM_FW
 655         ret = ti_sci_scan_clocks_from_fw(provider);
 656         if (ret) {
 657                 dev_err(dev, "scan clocks from FW failed: %d\n", ret);
 658                 return ret;
 659         }
 660 #else
 661         ret = ti_sci_scan_clocks_from_dt(provider);
 662         if (ret) {
 663                 dev_err(dev, "scan clocks from DT failed: %d\n", ret);
 664                 return ret;
 665         }
 666 #endif
 667 
 668         ret = ti_sci_init_clocks(provider);
 669         if (ret) {
 670                 pr_err("ti-sci-init-clocks failed.\n");
 671                 return ret;
 672         }
 673 
 674         return of_clk_add_hw_provider(np, sci_clk_get, provider);
 675 }
 676 
 677 /**
 678  * ti_sci_clk_remove - Remove TI SCI clock device
 679  * @pdev: platform device pointer for the device to be removed
 680  *
 681  * Removes the TI SCI device. Unregisters the clock provider registered
 682  * via common clock framework. Any memory allocated for the device will
 683  * be free'd silently via the devm framework. Returns 0 always.
 684  */
 685 static int ti_sci_clk_remove(struct platform_device *pdev)
 686 {
 687         of_clk_del_provider(pdev->dev.of_node);
 688 
 689         return 0;
 690 }
 691 
 692 static struct platform_driver ti_sci_clk_driver = {
 693         .probe = ti_sci_clk_probe,
 694         .remove = ti_sci_clk_remove,
 695         .driver = {
 696                 .name = "ti-sci-clk",
 697                 .of_match_table = of_match_ptr(ti_sci_clk_of_match),
 698         },
 699 };
 700 module_platform_driver(ti_sci_clk_driver);
 701 
 702 MODULE_LICENSE("GPL v2");
 703 MODULE_DESCRIPTION("TI System Control Interface(SCI) Clock driver");
 704 MODULE_AUTHOR("Tero Kristo");
 705 MODULE_ALIAS("platform:ti-sci-clk");