drivers/cpufreq/rockchip_big_little.c

   1 /*
   2  * Copyright (C) 2015 Fuzhou Rockchip Electronics Co., Ltd
   3  *
   4  * This software is licensed under the terms of the GNU General Public
   5  * License version 2, as published by the Free Software Foundation, and
   6  * may be copied, distributed, and modified under those terms.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  */
  14
  15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  16
  17 #include <linux/clk.h>
  18 #include <linux/cpufreq.h>
  19 #include <linux/err.h>
  20 #include <linux/kernel_stat.h>
  21 #include <linux/init.h>
  22 #include <linux/reboot.h>
  23 #include <linux/suspend.h>
  24 #include <linux/tick.h>
  25 #include <linux/workqueue.h>
  26 #include <linux/delay.h>
  27 #include <linux/regulator/consumer.h>
  28 #include <linux/fs.h>
  29 #include <linux/miscdevice.h>
  30 #include <linux/string.h>
  31 #include <linux/rockchip/cpu.h>
  32 #include <linux/rockchip/dvfs.h>
  33 #include <asm/smp_plat.h>
  34 #include <asm/unistd.h>
  35 #include <linux/uaccess.h>
  36 #include <asm/system_misc.h>
  37 #include <linux/cpu.h>
  38 #include <linux/of.h>
  39 #include <linux/mfd/syscon.h>
  40 #include <linux/regmap.h>
  41 #include <linux/rockchip/common.h>
  42 #include <dt-bindings/clock/rk_system_status.h>
  43 #include <linux/platform_device.h>
  44 #include <linux/module.h>
  45 #include "../../../drivers/clk/rockchip/clk-pd.h"
  46
  47 #define RK3368_GRF_CPU_CON(n) (0x500 + 4*n)
  48
  49 #define VERSION "1.0"
  50 #define RK_MAX_CLUSTERS 2
  51
  52 #ifdef DEBUG
  53 #define FREQ_DBG(fmt, args...) pr_debug(fmt, ## args)
  54 #define FREQ_LOG(fmt, args...) pr_debug(fmt, ## args)
  55 #else
  56 #define FREQ_DBG(fmt, args...) do {} while (0)
  57 #define FREQ_LOG(fmt, args...) do {} while (0)
  58 #endif
  59 #define FREQ_ERR(fmt, args...) pr_err(fmt, ## args)
  60
  61 /* Frequency table index must be sequential starting at 0 */
  62 static struct cpufreq_frequency_table default_freq_table[] = {
  63         {.frequency = 312 * 1000,       .index = 875 * 1000},
  64         {.frequency = 504 * 1000,       .index = 925 * 1000},
  65         {.frequency = 816 * 1000,       .index = 975 * 1000},
  66         {.frequency = 1008 * 1000,      .index = 1075 * 1000},
  67         {.frequency = 1200 * 1000,      .index = 1150 * 1000},
  68         {.frequency = 1416 * 1000,      .index = 1250 * 1000},
  69         {.frequency = 1608 * 1000,      .index = 1350 * 1000},
  70         {.frequency = CPUFREQ_TABLE_END},
  71 };
  72
  73 static struct cpufreq_frequency_table *freq_table[RK_MAX_CLUSTERS + 1];
  74 /*********************************************************/
  75 /* additional symantics for "relation" in cpufreq with pm */
  76 #define DISABLE_FURTHER_CPUFREQ         0x10
  77 #define ENABLE_FURTHER_CPUFREQ          0x20
  78 #define MASK_FURTHER_CPUFREQ            0x30
  79 /* With 0x00(NOCHANGE), it depends on the previous "further" status */
  80 #define CPUFREQ_PRIVATE                 0x100
  81 static unsigned int no_cpufreq_access[RK_MAX_CLUSTERS] = { 0 };
  82 static unsigned int suspend_freq[RK_MAX_CLUSTERS] = { 816 * 1000, 816 * 1000 };
  83 static unsigned int suspend_volt = 1100000;
  84 static unsigned int low_battery_freq[RK_MAX_CLUSTERS] = { 600 * 1000,
  85         600 * 1000 };
  86 static unsigned int low_battery_capacity = 5;
  87 static bool is_booting = true;
  88 static DEFINE_MUTEX(cpufreq_mutex);
  89 static struct dvfs_node *clk_cpu_dvfs_node[RK_MAX_CLUSTERS];
  90 static struct dvfs_node *clk_gpu_dvfs_node;
  91 static struct dvfs_node *clk_ddr_dvfs_node;
  92 static u32 cluster_policy_cpu[RK_MAX_CLUSTERS];
  93 static unsigned int big_little = 1;
  94
  95 /*******************************************************/
  96 static inline int cpu_to_cluster(int cpu)
  97 {
  98         int id = topology_physical_package_id(cpu);
  99         if (id < 0)
 100                 id = 0;
 101         return id;
 102 }
 103
 104 static unsigned int rockchip_bl_cpufreq_get_rate(unsigned int cpu)
 105 {
 106         u32 cur_cluster = cpu_to_cluster(cpu);
 107
 108         if (clk_cpu_dvfs_node[cur_cluster])
 109                 return clk_get_rate(clk_cpu_dvfs_node[cur_cluster]->clk) / 1000;
 110
 111         return 0;
 112 }
 113
 114 static bool cpufreq_is_ondemand(struct cpufreq_policy *policy)
 115 {
 116         char c = 0;
 117
 118         if (policy && policy->governor)
 119                 c = policy->governor->name[0];
 120         return (c == 'o' || c == 'i' || c == 'c' || c == 'h');
 121 }
 122
 123 static unsigned int get_freq_from_table(unsigned int max_freq,
 124                                         unsigned int cluster)
 125 {
 126         unsigned int i;
 127         unsigned int target_freq = 0;
 128
 129         for (i = 0; freq_table[cluster][i].frequency != CPUFREQ_TABLE_END;
 130              i++) {
 131                 unsigned int freq = freq_table[cluster][i].frequency;
 132
 133                 if (freq <= max_freq && target_freq < freq)
 134                         target_freq = freq;
 135         }
 136         if (!target_freq)
 137                 target_freq = max_freq;
 138         return target_freq;
 139 }
 140
 141 static int rockchip_bl_cpufreq_notifier_policy(struct notifier_block *nb,
 142                                                unsigned long val,
 143                                                void *data)
 144 {
 145         static unsigned int min_rate = 0, max_rate = -1;
 146         struct cpufreq_policy *policy = data;
 147         u32 cur_cluster = cpu_to_cluster(policy->cpu);
 148
 149         if (val != CPUFREQ_ADJUST)
 150                 return 0;
 151
 152         if (cpufreq_is_ondemand(policy)) {
 153                 FREQ_DBG("queue work\n");
 154                 dvfs_clk_enable_limit(clk_cpu_dvfs_node[cur_cluster],
 155                                       min_rate, max_rate);
 156         } else {
 157                 FREQ_DBG("cancel work\n");
 158                 dvfs_clk_get_limit(clk_cpu_dvfs_node[cur_cluster],
 159                                    &min_rate, &max_rate);
 160         }
 161
 162         return 0;
 163 }
 164
 165 static struct notifier_block notifier_policy_block = {
 166         .notifier_call = rockchip_bl_cpufreq_notifier_policy
 167 };
 168
 169 static int rockchip_bl_cpufreq_verify(struct cpufreq_policy *policy)
 170 {
 171         u32 cur_cluster = cpu_to_cluster(policy->cpu);
 172
 173         if (!freq_table[cur_cluster])
 174                 return -EINVAL;
 175         return cpufreq_frequency_table_verify(policy, freq_table[cur_cluster]);
 176 }
 177
 178 static int clk_node_get_cluster_id(struct clk *clk)
 179 {
 180         int i;
 181
 182         for (i = 0; i < RK_MAX_CLUSTERS; i++) {
 183                 if (clk_cpu_dvfs_node[i]->clk == clk)
 184                         return i;
 185         }
 186         return 0;
 187 }
 188
 189 static int rockchip_bl_cpufreq_scale_rate_for_dvfs(struct clk *clk,
 190                                                    unsigned long rate)
 191 {
 192         int ret;
 193         struct cpufreq_freqs freqs;
 194         struct cpufreq_policy *policy;
 195         u32 cur_cluster;
 196
 197         cur_cluster = clk_node_get_cluster_id(clk);
 198         policy = cpufreq_cpu_get(cluster_policy_cpu[cur_cluster]);
 199
 200         freqs.new = rate / 1000;
 201         freqs.old = clk_get_rate(clk) / 1000;
 202
 203         cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
 204
 205         FREQ_DBG("cpufreq_scale_rate_for_dvfs(%lu)\n", rate);
 206
 207         ret = clk_set_rate(clk, rate);
 208
 209         freqs.new = clk_get_rate(clk) / 1000;
 210         /* notifiers */
 211         cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
 212
 213         cpufreq_cpu_put(policy);
 214         return ret;
 215 }
 216
 217 static int cluster_cpus_freq_dvfs_init(u32 cluster_id, char *dvfs_name)
 218 {
 219         clk_cpu_dvfs_node[cluster_id] = clk_get_dvfs_node(dvfs_name);
 220
 221         if (!clk_cpu_dvfs_node[cluster_id]) {
 222                 FREQ_ERR("%s:cluster_id=%d,get dvfs err\n",
 223                          __func__, cluster_id);
 224                 return -EINVAL;
 225         }
 226         dvfs_clk_register_set_rate_callback(
 227                 clk_cpu_dvfs_node[cluster_id],
 228                 rockchip_bl_cpufreq_scale_rate_for_dvfs);
 229         freq_table[cluster_id] =
 230                 dvfs_get_freq_volt_table(clk_cpu_dvfs_node[cluster_id]);
 231         if (freq_table[cluster_id] == NULL) {
 232                 freq_table[cluster_id] = default_freq_table;
 233         } else {
 234                 int v = INT_MAX;
 235                 int i;
 236
 237                 for (i = 0; freq_table[cluster_id][i].frequency !=
 238                      CPUFREQ_TABLE_END; i++) {
 239                         if (freq_table[cluster_id][i].index >= suspend_volt &&
 240                             v > freq_table[cluster_id][i].index) {
 241                                 suspend_freq[cluster_id] =
 242                                         freq_table[cluster_id][i].frequency;
 243                                 v = freq_table[cluster_id][i].index;
 244                         }
 245                 }
 246         }
 247         low_battery_freq[cluster_id] =
 248                 get_freq_from_table(low_battery_freq[cluster_id], cluster_id);
 249         clk_enable_dvfs(clk_cpu_dvfs_node[cluster_id]);
 250         return 0;
 251 }
 252
 253 static int rockchip_bl_cpufreq_init_cpu0(struct cpufreq_policy *policy)
 254 {
 255         clk_gpu_dvfs_node = clk_get_dvfs_node("clk_gpu");
 256         if (clk_gpu_dvfs_node)
 257                 clk_enable_dvfs(clk_gpu_dvfs_node);
 258
 259         clk_ddr_dvfs_node = clk_get_dvfs_node("clk_ddr");
 260         if (clk_ddr_dvfs_node)
 261                 clk_enable_dvfs(clk_ddr_dvfs_node);
 262
 263         cluster_cpus_freq_dvfs_init(0, "clk_core_b");
 264         cluster_cpus_freq_dvfs_init(1, "clk_core_l");
 265
 266         cpufreq_register_notifier(&notifier_policy_block,
 267                                   CPUFREQ_POLICY_NOTIFIER);
 268
 269         pr_info("version " VERSION ", suspend freq %d %d MHz\n",
 270                 suspend_freq[0] / 1000, suspend_freq[1] / 1000);
 271         return 0;
 272 }
 273
 274 static int rockchip_bl_cpufreq_init(struct cpufreq_policy *policy)
 275 {
 276         static int cpu0_err;
 277         u32 cur_cluster = cpu_to_cluster(policy->cpu);
 278
 279         if (policy->cpu == 0)
 280                 cpu0_err = rockchip_bl_cpufreq_init_cpu0(policy);
 281         if (cpu0_err)
 282                 return cpu0_err;
 283
 284         cluster_policy_cpu[cur_cluster] = policy->cpu;
 285
 286         /* set freq min max */
 287         cpufreq_frequency_table_cpuinfo(policy, freq_table[cur_cluster]);
 288         /* sys nod */
 289         cpufreq_frequency_table_get_attr(freq_table[cur_cluster], policy->cpu);
 290
 291         if (cur_cluster < RK_MAX_CLUSTERS)
 292                 cpumask_copy(policy->cpus, topology_core_cpumask(policy->cpu));
 293
 294         policy->cur = clk_get_rate(clk_cpu_dvfs_node[cur_cluster]->clk) / 1000;
 295
 296         /* make ondemand default sampling_rate to 40000 */
 297         policy->cpuinfo.transition_latency = 40 * NSEC_PER_USEC;
 298
 299         return 0;
 300 }
 301
 302 static int rockchip_bl_cpufreq_exit(struct cpufreq_policy *policy)
 303 {
 304         u32 cur_cluster = cpu_to_cluster(policy->cpu);
 305
 306         if (policy->cpu == 0) {
 307                 cpufreq_unregister_notifier(&notifier_policy_block,
 308                                             CPUFREQ_POLICY_NOTIFIER);
 309         }
 310         cpufreq_frequency_table_cpuinfo(policy, freq_table[cur_cluster]);
 311         clk_put_dvfs_node(clk_cpu_dvfs_node[cur_cluster]);
 312
 313         return 0;
 314 }
 315
 316 static struct freq_attr *rockchip_bl_cpufreq_attr[] = {
 317         &cpufreq_freq_attr_scaling_available_freqs,
 318         NULL,
 319 };
 320
 321 #ifdef CONFIG_CHARGER_DISPLAY
 322 extern int rk_get_system_battery_capacity(void);
 323 #else
 324 static int rk_get_system_battery_capacity(void)
 325 {
 326         return 100;
 327 }
 328 #endif
 329
 330 static unsigned int
 331 rockchip_bl_cpufreq_scale_limit(unsigned int target_freq,
 332                                 struct cpufreq_policy *policy, bool is_private)
 333 {
 334         bool is_ondemand = cpufreq_is_ondemand(policy);
 335         u32 cur_cluster = cpu_to_cluster(policy->cpu);
 336
 337         if (!is_ondemand)
 338                 return target_freq;
 339
 340         if (is_booting) {
 341                 s64 boottime_ms = ktime_to_ms(ktime_get_boottime());
 342
 343                 if (boottime_ms > 60 * MSEC_PER_SEC) {
 344                         is_booting = false;
 345                 } else if (target_freq > low_battery_freq[cur_cluster] &&
 346                            rk_get_system_battery_capacity() <=
 347                            low_battery_capacity) {
 348                         target_freq = low_battery_freq[cur_cluster];
 349                 }
 350         }
 351
 352         return target_freq;
 353 }
 354
 355 static int rockchip_bl_cpufreq_target(struct cpufreq_policy *policy,
 356                                       unsigned int target_freq,
 357                                       unsigned int relation)
 358 {
 359         unsigned int i, new_freq = target_freq, new_rate, cur_rate;
 360         int ret = 0;
 361         bool is_private;
 362         u32 cur_cluster = cpu_to_cluster(policy->cpu);
 363
 364         if (!freq_table[cur_cluster]) {
 365                 FREQ_ERR("no freq table!\n");
 366                 return -EINVAL;
 367         }
 368
 369         mutex_lock(&cpufreq_mutex);
 370
 371         is_private = relation & CPUFREQ_PRIVATE;
 372         relation &= ~CPUFREQ_PRIVATE;
 373
 374         if ((relation & ENABLE_FURTHER_CPUFREQ) &&
 375             no_cpufreq_access[cur_cluster])
 376                 no_cpufreq_access[cur_cluster]--;
 377         if (no_cpufreq_access[cur_cluster]) {
 378                 FREQ_LOG("denied access to %s as it is disabled temporarily\n",
 379                          __func__);
 380                 ret = -EINVAL;
 381                 goto out;
 382         }
 383         if (relation & DISABLE_FURTHER_CPUFREQ)
 384                 no_cpufreq_access[cur_cluster]++;
 385         relation &= ~MASK_FURTHER_CPUFREQ;
 386
 387         ret = cpufreq_frequency_table_target(policy, freq_table[cur_cluster],
 388                                              target_freq, relation, &i);
 389         if (ret) {
 390                 FREQ_ERR("no freq match for %d(ret=%d)\n", target_freq, ret);
 391                 goto out;
 392         }
 393         new_freq = freq_table[cur_cluster][i].frequency;
 394         if (!no_cpufreq_access[cur_cluster])
 395                 new_freq =
 396                     rockchip_bl_cpufreq_scale_limit(new_freq, policy,
 397                                                     is_private);
 398
 399         new_rate = new_freq * 1000;
 400         cur_rate = dvfs_clk_get_rate(clk_cpu_dvfs_node[cur_cluster]);
 401         FREQ_LOG("req = %7u new = %7u (was = %7u)\n", target_freq,
 402                  new_freq, cur_rate / 1000);
 403         if (new_rate == cur_rate)
 404                 goto out;
 405         ret = dvfs_clk_set_rate(clk_cpu_dvfs_node[cur_cluster], new_rate);
 406
 407 out:
 408         FREQ_DBG("set freq (%7u) end, ret %d\n", new_freq, ret);
 409         mutex_unlock(&cpufreq_mutex);
 410         return ret;
 411 }
 412
 413 static int rockchip_bl_cpufreq_pm_notifier_event(struct notifier_block *this,
 414                                                  unsigned long event, void *ptr)
 415 {
 416         int ret = NOTIFY_DONE;
 417         int i;
 418
 419         for (i = 0; i < RK_MAX_CLUSTERS; i++) {
 420                 struct cpufreq_policy *policy =
 421                         cpufreq_cpu_get(cluster_policy_cpu[i]);
 422
 423                 if (!policy)
 424                         return ret;
 425
 426                 if (!cpufreq_is_ondemand(policy))
 427                         goto out;
 428
 429                 switch (event) {
 430                 case PM_SUSPEND_PREPARE:
 431                         policy->cur++;
 432                         ret = cpufreq_driver_target(policy, suspend_freq[i],
 433                                                     DISABLE_FURTHER_CPUFREQ |
 434                                                     CPUFREQ_RELATION_H);
 435                         if (ret < 0) {
 436                                 ret = NOTIFY_BAD;
 437                                 goto out;
 438                         }
 439                         ret = NOTIFY_OK;
 440                         break;
 441                 case PM_POST_RESTORE:
 442                 case PM_POST_SUSPEND:
 443                         /* if (target_freq == policy->cur) then
 444                            cpufreq_driver_target will return, and
 445                            our target will not be called, it casue
 446                            ENABLE_FURTHER_CPUFREQ flag invalid,
 447                            avoid that. */
 448                         policy->cur++;
 449                         cpufreq_driver_target(policy, suspend_freq[i],
 450                                               ENABLE_FURTHER_CPUFREQ |
 451                                               CPUFREQ_RELATION_H);
 452                         ret = NOTIFY_OK;
 453                         break;
 454                 }
 455 out:
 456                 cpufreq_cpu_put(policy);
 457         }
 458         return ret;
 459 }
 460
 461 static struct notifier_block rockchip_bl_cpufreq_pm_notifier = {
 462         .notifier_call = rockchip_bl_cpufreq_pm_notifier_event,
 463 };
 464
 465 static int rockchip_bl_cpufreq_reboot_limit_freq(void)
 466 {
 467         struct regulator *regulator;
 468         int volt = 0;
 469         u32 rate;
 470         int i;
 471
 472         dvfs_disable_temp_limit();
 473
 474         for (i = 0; i < RK_MAX_CLUSTERS; i++) {
 475                 dvfs_clk_enable_limit(clk_cpu_dvfs_node[i],
 476                                       1000 * suspend_freq[i],
 477                                       1000 * suspend_freq[i]);
 478                 rate = dvfs_clk_get_rate(clk_cpu_dvfs_node[i]);
 479         }
 480
 481         regulator = dvfs_get_regulator("vdd_arm");
 482         if (regulator)
 483                 volt = regulator_get_voltage(regulator);
 484         else
 485                 pr_info("get arm regulator failed\n");
 486         pr_info("reboot set cluster0 rate=%lu, cluster1 rate=%lu, volt=%d\n",
 487                 dvfs_clk_get_rate(clk_cpu_dvfs_node[0]),
 488                 dvfs_clk_get_rate(clk_cpu_dvfs_node[1]), volt);
 489
 490         return 0;
 491 }
 492
 493 static int rockchip_bl_cpufreq_reboot_notifier_event(struct notifier_block
 494                                                      *this, unsigned long event,
 495                                                      void *ptr)
 496 {
 497         rockchip_set_system_status(SYS_STATUS_REBOOT);
 498         rockchip_bl_cpufreq_reboot_limit_freq();
 499
 500         return NOTIFY_OK;
 501 };
 502
 503 static struct notifier_block rockchip_bl_cpufreq_reboot_notifier = {
 504         .notifier_call = rockchip_bl_cpufreq_reboot_notifier_event,
 505 };
 506
 507 static struct cpufreq_driver rockchip_bl_cpufreq_driver = {
 508         .flags = CPUFREQ_CONST_LOOPS,
 509         .verify = rockchip_bl_cpufreq_verify,
 510         .target = rockchip_bl_cpufreq_target,
 511         .get = rockchip_bl_cpufreq_get_rate,
 512         .init = rockchip_bl_cpufreq_init,
 513         .exit = rockchip_bl_cpufreq_exit,
 514         .name = "rockchip-bl",
 515         .have_governor_per_policy = true,
 516         .attr = rockchip_bl_cpufreq_attr,
 517 };
 518
 519 static const struct of_device_id rockchip_bl_cpufreq_match[] = {
 520         {
 521                 .compatible = "rockchip,rk3368-cpufreq",
 522         },
 523         {},
 524 };
 525 MODULE_DEVICE_TABLE(of, rockchip_bl_cpufreq_match);
 526
 527 static int rockchip_bl_cpufreq_probe(struct platform_device *pdev)
 528 {
 529         struct device_node *np;
 530         struct regmap *grf_regmap;
 531         unsigned int big_bits, litt_bits;
 532         int ret;
 533
 534         np = pdev->dev.of_node;
 535         if (!np)
 536                 return -ENODEV;
 537
 538         grf_regmap = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
 539         if (IS_ERR(grf_regmap)) {
 540                 FREQ_ERR("Cpufreq couldn't find grf regmap\n");
 541                 return PTR_ERR(grf_regmap);
 542         }
 543         ret = regmap_read(grf_regmap, RK3368_GRF_CPU_CON(3), &big_bits);
 544         if (ret != 0) {
 545                 FREQ_ERR("Cpufreq couldn't read to GRF\n");
 546                 return -1;
 547         }
 548         ret = regmap_read(grf_regmap, RK3368_GRF_CPU_CON(1), &litt_bits);
 549         if (ret != 0) {
 550                 FREQ_ERR("Cpufreq couldn't read to GRF\n");
 551                 return -1;
 552         }
 553
 554         big_bits = (big_bits >> 8) & 0x03;
 555         litt_bits = (litt_bits >> 8) & 0x03;
 556
 557         if (big_bits == 0x01 && litt_bits == 0x00)
 558                 big_little = 1;
 559         else if (big_bits == 0x0 && litt_bits == 0x01)
 560                 big_little = 0;
 561         pr_info("boot from %d\n", big_little);
 562
 563         register_reboot_notifier(&rockchip_bl_cpufreq_reboot_notifier);
 564         register_pm_notifier(&rockchip_bl_cpufreq_pm_notifier);
 565
 566         return cpufreq_register_driver(&rockchip_bl_cpufreq_driver);
 567 }
 568
 569 static int rockchip_bl_cpufreq_remove(struct platform_device *pdev)
 570 {
 571         cpufreq_unregister_driver(&rockchip_bl_cpufreq_driver);
 572         return 0;
 573 }
 574
 575 static struct platform_driver rockchip_bl_cpufreq_platdrv = {
 576         .driver = {
 577                 .name   = "rockchip-bl-cpufreq",
 578                 .owner  = THIS_MODULE,
 579                 .of_match_table = rockchip_bl_cpufreq_match,
 580         },
 581         .probe          = rockchip_bl_cpufreq_probe,
 582         .remove         = rockchip_bl_cpufreq_remove,
 583 };
 584
 585 module_platform_driver(rockchip_bl_cpufreq_platdrv);
 586
 587 MODULE_AUTHOR("Xiao Feng <xf@rock-chips.com>");
 588 MODULE_LICENSE("GPL");