drivers/clk/qcom/clk-smd-rpm.c

   1 /*
   2  * Copyright (c) 2016, Linaro Limited
   3  * Copyright (c) 2014, The Linux Foundation. All rights reserved.
   4  *
   5  * This software is licensed under the terms of the GNU General Public
   6  * License version 2, as published by the Free Software Foundation, and
   7  * may be copied, distributed, and modified under those terms.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/clk-provider.h>
  16 #include <linux/err.h>
  17 #include <linux/export.h>
  18 #include <linux/init.h>
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/mutex.h>
  22 #include <linux/of.h>
  23 #include <linux/of_device.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/soc/qcom/smd-rpm.h>
  26
  27 #include <dt-bindings/clock/qcom,rpmcc.h>
  28 #include <dt-bindings/mfd/qcom-rpm.h>
  29
  30 #define QCOM_RPM_KEY_SOFTWARE_ENABLE                    0x6e657773
  31 #define QCOM_RPM_KEY_PIN_CTRL_CLK_BUFFER_ENABLE_KEY     0x62636370
  32 #define QCOM_RPM_SMD_KEY_RATE                           0x007a484b
  33 #define QCOM_RPM_SMD_KEY_ENABLE                         0x62616e45
  34 #define QCOM_RPM_SMD_KEY_STATE                          0x54415453
  35 #define QCOM_RPM_SCALING_ENABLE_ID                      0x2
  36
  37 #define __DEFINE_CLK_SMD_RPM(_platform, _name, _active, type, r_id, stat_id,  \
  38                              key)                                             \
  39         static struct clk_smd_rpm _platform##_##_active;                      \
  40         static struct clk_smd_rpm _platform##_##_name = {                     \
  41                 .rpm_res_type = (type),                                       \
  42                 .rpm_clk_id = (r_id),                                         \
  43                 .rpm_status_id = (stat_id),                                   \
  44                 .rpm_key = (key),                                             \
  45                 .peer = &_platform##_##_active,                               \
  46                 .rate = INT_MAX,                                              \
  47                 .hw.init = &(struct clk_init_data){                           \
  48                         .ops = &clk_smd_rpm_ops,                              \
  49                         .name = #_name,                                       \
  50                         .parent_names = (const char *[]){ "xo_board" },       \
  51                         .num_parents = 1,                                     \
  52                 },                                                            \
  53         };                                                                    \
  54         static struct clk_smd_rpm _platform##_##_active = {                   \
  55                 .rpm_res_type = (type),                                       \
  56                 .rpm_clk_id = (r_id),                                         \
  57                 .rpm_status_id = (stat_id),                                   \
  58                 .active_only = true,                                          \
  59                 .rpm_key = (key),                                             \
  60                 .peer = &_platform##_##_name,                                 \
  61                 .rate = INT_MAX,                                              \
  62                 .hw.init = &(struct clk_init_data){                           \
  63                         .ops = &clk_smd_rpm_ops,                              \
  64                         .name = #_active,                                     \
  65                         .parent_names = (const char *[]){ "xo_board" },       \
  66                         .num_parents = 1,                                     \
  67                 },                                                            \
  68         }
  69
  70 #define __DEFINE_CLK_SMD_RPM_BRANCH(_platform, _name, _active, type, r_id,    \
  71                                     stat_id, r, key)                          \
  72         static struct clk_smd_rpm _platform##_##_active;                      \
  73         static struct clk_smd_rpm _platform##_##_name = {                     \
  74                 .rpm_res_type = (type),                                       \
  75                 .rpm_clk_id = (r_id),                                         \
  76                 .rpm_status_id = (stat_id),                                   \
  77                 .rpm_key = (key),                                             \
  78                 .branch = true,                                               \
  79                 .peer = &_platform##_##_active,                               \
  80                 .rate = (r),                                                  \
  81                 .hw.init = &(struct clk_init_data){                           \
  82                         .ops = &clk_smd_rpm_branch_ops,                       \
  83                         .name = #_name,                                       \
  84                         .parent_names = (const char *[]){ "xo_board" },       \
  85                         .num_parents = 1,                                     \
  86                 },                                                            \
  87         };                                                                    \
  88         static struct clk_smd_rpm _platform##_##_active = {                   \
  89                 .rpm_res_type = (type),                                       \
  90                 .rpm_clk_id = (r_id),                                         \
  91                 .rpm_status_id = (stat_id),                                   \
  92                 .active_only = true,                                          \
  93                 .rpm_key = (key),                                             \
  94                 .branch = true,                                               \
  95                 .peer = &_platform##_##_name,                                 \
  96                 .rate = (r),                                                  \
  97                 .hw.init = &(struct clk_init_data){                           \
  98                         .ops = &clk_smd_rpm_branch_ops,                       \
  99                         .name = #_active,                                     \
 100                         .parent_names = (const char *[]){ "xo_board" },       \
 101                         .num_parents = 1,                                     \
 102                 },                                                            \
 103         }
 104
 105 #define DEFINE_CLK_SMD_RPM(_platform, _name, _active, type, r_id)             \
 106                 __DEFINE_CLK_SMD_RPM(_platform, _name, _active, type, r_id,   \
 107                 0, QCOM_RPM_SMD_KEY_RATE)
 108
 109 #define DEFINE_CLK_SMD_RPM_BRANCH(_platform, _name, _active, type, r_id, r)   \
 110                 __DEFINE_CLK_SMD_RPM_BRANCH(_platform, _name, _active, type,  \
 111                 r_id, 0, r, QCOM_RPM_SMD_KEY_ENABLE)
 112
 113 #define DEFINE_CLK_SMD_RPM_QDSS(_platform, _name, _active, type, r_id)        \
 114                 __DEFINE_CLK_SMD_RPM(_platform, _name, _active, type, r_id,   \
 115                 0, QCOM_RPM_SMD_KEY_STATE)
 116
 117 #define DEFINE_CLK_SMD_RPM_XO_BUFFER(_platform, _name, _active, r_id)         \
 118                 __DEFINE_CLK_SMD_RPM_BRANCH(_platform, _name, _active,        \
 119                 QCOM_SMD_RPM_CLK_BUF_A, r_id, 0, 1000,                        \
 120                 QCOM_RPM_KEY_SOFTWARE_ENABLE)
 121
 122 #define DEFINE_CLK_SMD_RPM_XO_BUFFER_PINCTRL(_platform, _name, _active, r_id) \
 123                 __DEFINE_CLK_SMD_RPM_BRANCH(_platform, _name, _active,        \
 124                 QCOM_SMD_RPM_CLK_BUF_A, r_id, 0, 1000,                        \
 125                 QCOM_RPM_KEY_PIN_CTRL_CLK_BUFFER_ENABLE_KEY)
 126
 127 #define to_clk_smd_rpm(_hw) container_of(_hw, struct clk_smd_rpm, hw)
 128
 129 struct clk_smd_rpm {
 130         const int rpm_res_type;
 131         const int rpm_key;
 132         const int rpm_clk_id;
 133         const int rpm_status_id;
 134         const bool active_only;
 135         bool enabled;
 136         bool branch;
 137         struct clk_smd_rpm *peer;
 138         struct clk_hw hw;
 139         unsigned long rate;
 140         struct qcom_smd_rpm *rpm;
 141 };
 142
 143 struct clk_smd_rpm_req {
 144         __le32 key;
 145         __le32 nbytes;
 146         __le32 value;
 147 };
 148
 149 struct rpm_cc {
 150         struct qcom_rpm *rpm;
 151         struct clk_smd_rpm **clks;
 152         size_t num_clks;
 153 };
 154
 155 struct rpm_smd_clk_desc {
 156         struct clk_smd_rpm **clks;
 157         size_t num_clks;
 158 };
 159
 160 static DEFINE_MUTEX(rpm_smd_clk_lock);
 161
 162 static int clk_smd_rpm_handoff(struct clk_smd_rpm *r)
 163 {
 164         int ret;
 165         struct clk_smd_rpm_req req = {
 166                 .key = cpu_to_le32(r->rpm_key),
 167                 .nbytes = cpu_to_le32(sizeof(u32)),
 168                 .value = cpu_to_le32(INT_MAX),
 169         };
 170
 171         ret = qcom_rpm_smd_write(r->rpm, QCOM_SMD_RPM_ACTIVE_STATE,
 172                                  r->rpm_res_type, r->rpm_clk_id, &req,
 173                                  sizeof(req));
 174         if (ret)
 175                 return ret;
 176         ret = qcom_rpm_smd_write(r->rpm, QCOM_SMD_RPM_SLEEP_STATE,
 177                                  r->rpm_res_type, r->rpm_clk_id, &req,
 178                                  sizeof(req));
 179         if (ret)
 180                 return ret;
 181
 182         return 0;
 183 }
 184
 185 static int clk_smd_rpm_set_rate_active(struct clk_smd_rpm *r,
 186                                        unsigned long rate)
 187 {
 188         struct clk_smd_rpm_req req = {
 189                 .key = cpu_to_le32(r->rpm_key),
 190                 .nbytes = cpu_to_le32(sizeof(u32)),
 191                 .value = cpu_to_le32(DIV_ROUND_UP(rate, 1000)), /* to kHz */
 192         };
 193
 194         return qcom_rpm_smd_write(r->rpm, QCOM_SMD_RPM_ACTIVE_STATE,
 195                                   r->rpm_res_type, r->rpm_clk_id, &req,
 196                                   sizeof(req));
 197 }
 198
 199 static int clk_smd_rpm_set_rate_sleep(struct clk_smd_rpm *r,
 200                                       unsigned long rate)
 201 {
 202         struct clk_smd_rpm_req req = {
 203                 .key = cpu_to_le32(r->rpm_key),
 204                 .nbytes = cpu_to_le32(sizeof(u32)),
 205                 .value = cpu_to_le32(DIV_ROUND_UP(rate, 1000)), /* to kHz */
 206         };
 207
 208         return qcom_rpm_smd_write(r->rpm, QCOM_SMD_RPM_SLEEP_STATE,
 209                                   r->rpm_res_type, r->rpm_clk_id, &req,
 210                                   sizeof(req));
 211 }
 212
 213 static void to_active_sleep(struct clk_smd_rpm *r, unsigned long rate,
 214                             unsigned long *active, unsigned long *sleep)
 215 {
 216         *active = rate;
 217
 218         /*
 219          * Active-only clocks don't care what the rate is during sleep. So,
 220          * they vote for zero.
 221          */
 222         if (r->active_only)
 223                 *sleep = 0;
 224         else
 225                 *sleep = *active;
 226 }
 227
 228 static int clk_smd_rpm_prepare(struct clk_hw *hw)
 229 {
 230         struct clk_smd_rpm *r = to_clk_smd_rpm(hw);
 231         struct clk_smd_rpm *peer = r->peer;
 232         unsigned long this_rate = 0, this_sleep_rate = 0;
 233         unsigned long peer_rate = 0, peer_sleep_rate = 0;
 234         unsigned long active_rate, sleep_rate;
 235         int ret = 0;
 236
 237         mutex_lock(&rpm_smd_clk_lock);
 238
 239         /* Don't send requests to the RPM if the rate has not been set. */
 240         if (!r->rate)
 241                 goto out;
 242
 243         to_active_sleep(r, r->rate, &this_rate, &this_sleep_rate);
 244
 245         /* Take peer clock's rate into account only if it's enabled. */
 246         if (peer->enabled)
 247                 to_active_sleep(peer, peer->rate,
 248                                 &peer_rate, &peer_sleep_rate);
 249
 250         active_rate = max(this_rate, peer_rate);
 251
 252         if (r->branch)
 253                 active_rate = !!active_rate;
 254
 255         ret = clk_smd_rpm_set_rate_active(r, active_rate);
 256         if (ret)
 257                 goto out;
 258
 259         sleep_rate = max(this_sleep_rate, peer_sleep_rate);
 260         if (r->branch)
 261                 sleep_rate = !!sleep_rate;
 262
 263         ret = clk_smd_rpm_set_rate_sleep(r, sleep_rate);
 264         if (ret)
 265                 /* Undo the active set vote and restore it */
 266                 ret = clk_smd_rpm_set_rate_active(r, peer_rate);
 267
 268 out:
 269         if (!ret)
 270                 r->enabled = true;
 271
 272         mutex_unlock(&rpm_smd_clk_lock);
 273
 274         return ret;
 275 }
 276
 277 static void clk_smd_rpm_unprepare(struct clk_hw *hw)
 278 {
 279         struct clk_smd_rpm *r = to_clk_smd_rpm(hw);
 280         struct clk_smd_rpm *peer = r->peer;
 281         unsigned long peer_rate = 0, peer_sleep_rate = 0;
 282         unsigned long active_rate, sleep_rate;
 283         int ret;
 284
 285         mutex_lock(&rpm_smd_clk_lock);
 286
 287         if (!r->rate)
 288                 goto out;
 289
 290         /* Take peer clock's rate into account only if it's enabled. */
 291         if (peer->enabled)
 292                 to_active_sleep(peer, peer->rate, &peer_rate,
 293                                 &peer_sleep_rate);
 294
 295         active_rate = r->branch ? !!peer_rate : peer_rate;
 296         ret = clk_smd_rpm_set_rate_active(r, active_rate);
 297         if (ret)
 298                 goto out;
 299
 300         sleep_rate = r->branch ? !!peer_sleep_rate : peer_sleep_rate;
 301         ret = clk_smd_rpm_set_rate_sleep(r, sleep_rate);
 302         if (ret)
 303                 goto out;
 304
 305         r->enabled = false;
 306
 307 out:
 308         mutex_unlock(&rpm_smd_clk_lock);
 309 }
 310
 311 static int clk_smd_rpm_set_rate(struct clk_hw *hw, unsigned long rate,
 312                                 unsigned long parent_rate)
 313 {
 314         struct clk_smd_rpm *r = to_clk_smd_rpm(hw);
 315         struct clk_smd_rpm *peer = r->peer;
 316         unsigned long active_rate, sleep_rate;
 317         unsigned long this_rate = 0, this_sleep_rate = 0;
 318         unsigned long peer_rate = 0, peer_sleep_rate = 0;
 319         int ret = 0;
 320
 321         mutex_lock(&rpm_smd_clk_lock);
 322
 323         if (!r->enabled)
 324                 goto out;
 325
 326         to_active_sleep(r, rate, &this_rate, &this_sleep_rate);
 327
 328         /* Take peer clock's rate into account only if it's enabled. */
 329         if (peer->enabled)
 330                 to_active_sleep(peer, peer->rate,
 331                                 &peer_rate, &peer_sleep_rate);
 332
 333         active_rate = max(this_rate, peer_rate);
 334         ret = clk_smd_rpm_set_rate_active(r, active_rate);
 335         if (ret)
 336                 goto out;
 337
 338         sleep_rate = max(this_sleep_rate, peer_sleep_rate);
 339         ret = clk_smd_rpm_set_rate_sleep(r, sleep_rate);
 340         if (ret)
 341                 goto out;
 342
 343         r->rate = rate;
 344
 345 out:
 346         mutex_unlock(&rpm_smd_clk_lock);
 347
 348         return ret;
 349 }
 350
 351 static long clk_smd_rpm_round_rate(struct clk_hw *hw, unsigned long rate,
 352                                    unsigned long *parent_rate)
 353 {
 354         /*
 355          * RPM handles rate rounding and we don't have a way to
 356          * know what the rate will be, so just return whatever
 357          * rate is requested.
 358          */
 359         return rate;
 360 }
 361
 362 static unsigned long clk_smd_rpm_recalc_rate(struct clk_hw *hw,
 363                                              unsigned long parent_rate)
 364 {
 365         struct clk_smd_rpm *r = to_clk_smd_rpm(hw);
 366
 367         /*
 368          * RPM handles rate rounding and we don't have a way to
 369          * know what the rate will be, so just return whatever
 370          * rate was set.
 371          */
 372         return r->rate;
 373 }
 374
 375 static int clk_smd_rpm_enable_scaling(struct qcom_smd_rpm *rpm)
 376 {
 377         int ret;
 378         struct clk_smd_rpm_req req = {
 379                 .key = cpu_to_le32(QCOM_RPM_SMD_KEY_ENABLE),
 380                 .nbytes = cpu_to_le32(sizeof(u32)),
 381                 .value = cpu_to_le32(1),
 382         };
 383
 384         ret = qcom_rpm_smd_write(rpm, QCOM_SMD_RPM_SLEEP_STATE,
 385                                  QCOM_SMD_RPM_MISC_CLK,
 386                                  QCOM_RPM_SCALING_ENABLE_ID, &req, sizeof(req));
 387         if (ret) {
 388                 pr_err("RPM clock scaling (sleep set) not enabled!\n");
 389                 return ret;
 390         }
 391
 392         ret = qcom_rpm_smd_write(rpm, QCOM_SMD_RPM_ACTIVE_STATE,
 393                                  QCOM_SMD_RPM_MISC_CLK,
 394                                  QCOM_RPM_SCALING_ENABLE_ID, &req, sizeof(req));
 395         if (ret) {
 396                 pr_err("RPM clock scaling (active set) not enabled!\n");
 397                 return ret;
 398         }
 399
 400         pr_debug("%s: RPM clock scaling is enabled\n", __func__);
 401         return 0;
 402 }
 403
 404 static const struct clk_ops clk_smd_rpm_ops = {
 405         .prepare        = clk_smd_rpm_prepare,
 406         .unprepare      = clk_smd_rpm_unprepare,
 407         .set_rate       = clk_smd_rpm_set_rate,
 408         .round_rate     = clk_smd_rpm_round_rate,
 409         .recalc_rate    = clk_smd_rpm_recalc_rate,
 410 };
 411
 412 static const struct clk_ops clk_smd_rpm_branch_ops = {
 413         .prepare        = clk_smd_rpm_prepare,
 414         .unprepare      = clk_smd_rpm_unprepare,
 415         .round_rate     = clk_smd_rpm_round_rate,
 416         .recalc_rate    = clk_smd_rpm_recalc_rate,
 417 };
 418
 419 /* msm8916 */
 420 DEFINE_CLK_SMD_RPM(msm8916, pcnoc_clk, pcnoc_a_clk, QCOM_SMD_RPM_BUS_CLK, 0);
 421 DEFINE_CLK_SMD_RPM(msm8916, snoc_clk, snoc_a_clk, QCOM_SMD_RPM_BUS_CLK, 1);
 422 DEFINE_CLK_SMD_RPM(msm8916, bimc_clk, bimc_a_clk, QCOM_SMD_RPM_MEM_CLK, 0);
 423 DEFINE_CLK_SMD_RPM_QDSS(msm8916, qdss_clk, qdss_a_clk, QCOM_SMD_RPM_MISC_CLK, 1);
 424 DEFINE_CLK_SMD_RPM_XO_BUFFER(msm8916, bb_clk1, bb_clk1_a, 1);
 425 DEFINE_CLK_SMD_RPM_XO_BUFFER(msm8916, bb_clk2, bb_clk2_a, 2);
 426 DEFINE_CLK_SMD_RPM_XO_BUFFER(msm8916, rf_clk1, rf_clk1_a, 4);
 427 DEFINE_CLK_SMD_RPM_XO_BUFFER(msm8916, rf_clk2, rf_clk2_a, 5);
 428 DEFINE_CLK_SMD_RPM_XO_BUFFER_PINCTRL(msm8916, bb_clk1_pin, bb_clk1_a_pin, 1);
 429 DEFINE_CLK_SMD_RPM_XO_BUFFER_PINCTRL(msm8916, bb_clk2_pin, bb_clk2_a_pin, 2);
 430 DEFINE_CLK_SMD_RPM_XO_BUFFER_PINCTRL(msm8916, rf_clk1_pin, rf_clk1_a_pin, 4);
 431 DEFINE_CLK_SMD_RPM_XO_BUFFER_PINCTRL(msm8916, rf_clk2_pin, rf_clk2_a_pin, 5);
 432
 433 static struct clk_smd_rpm *msm8916_clks[] = {
 434         [RPM_SMD_PCNOC_CLK]             = &msm8916_pcnoc_clk,
 435         [RPM_SMD_PCNOC_A_CLK]           = &msm8916_pcnoc_a_clk,
 436         [RPM_SMD_SNOC_CLK]              = &msm8916_snoc_clk,
 437         [RPM_SMD_SNOC_A_CLK]            = &msm8916_snoc_a_clk,
 438         [RPM_SMD_BIMC_CLK]              = &msm8916_bimc_clk,
 439         [RPM_SMD_BIMC_A_CLK]            = &msm8916_bimc_a_clk,
 440         [RPM_SMD_QDSS_CLK]              = &msm8916_qdss_clk,
 441         [RPM_SMD_QDSS_A_CLK]            = &msm8916_qdss_a_clk,
 442         [RPM_SMD_BB_CLK1]               = &msm8916_bb_clk1,
 443         [RPM_SMD_BB_CLK1_A]             = &msm8916_bb_clk1_a,
 444         [RPM_SMD_BB_CLK2]               = &msm8916_bb_clk2,
 445         [RPM_SMD_BB_CLK2_A]             = &msm8916_bb_clk2_a,
 446         [RPM_SMD_RF_CLK1]               = &msm8916_rf_clk1,
 447         [RPM_SMD_RF_CLK1_A]             = &msm8916_rf_clk1_a,
 448         [RPM_SMD_RF_CLK2]               = &msm8916_rf_clk2,
 449         [RPM_SMD_RF_CLK2_A]             = &msm8916_rf_clk2_a,
 450         [RPM_SMD_BB_CLK1_PIN]           = &msm8916_bb_clk1_pin,
 451         [RPM_SMD_BB_CLK1_A_PIN]         = &msm8916_bb_clk1_a_pin,
 452         [RPM_SMD_BB_CLK2_PIN]           = &msm8916_bb_clk2_pin,
 453         [RPM_SMD_BB_CLK2_A_PIN]         = &msm8916_bb_clk2_a_pin,
 454         [RPM_SMD_RF_CLK1_PIN]           = &msm8916_rf_clk1_pin,
 455         [RPM_SMD_RF_CLK1_A_PIN]         = &msm8916_rf_clk1_a_pin,
 456         [RPM_SMD_RF_CLK2_PIN]           = &msm8916_rf_clk2_pin,
 457         [RPM_SMD_RF_CLK2_A_PIN]         = &msm8916_rf_clk2_a_pin,
 458 };
 459
 460 static const struct rpm_smd_clk_desc rpm_clk_msm8916 = {
 461         .clks = msm8916_clks,
 462         .num_clks = ARRAY_SIZE(msm8916_clks),
 463 };
 464
 465 static const struct of_device_id rpm_smd_clk_match_table[] = {
 466         { .compatible = "qcom,rpmcc-msm8916", .data = &rpm_clk_msm8916 },
 467         { }
 468 };
 469 MODULE_DEVICE_TABLE(of, rpm_smd_clk_match_table);
 470
 471 static struct clk_hw *qcom_smdrpm_clk_hw_get(struct of_phandle_args *clkspec,
 472                                              void *data)
 473 {
 474         struct rpm_cc *rcc = data;
 475         unsigned int idx = clkspec->args[0];
 476
 477         if (idx >= rcc->num_clks) {
 478                 pr_err("%s: invalid index %u\n", __func__, idx);
 479                 return ERR_PTR(-EINVAL);
 480         }
 481
 482         return rcc->clks[idx] ? &rcc->clks[idx]->hw : ERR_PTR(-ENOENT);
 483 }
 484
 485 static int rpm_smd_clk_probe(struct platform_device *pdev)
 486 {
 487         struct rpm_cc *rcc;
 488         int ret;
 489         size_t num_clks, i;
 490         struct qcom_smd_rpm *rpm;
 491         struct clk_smd_rpm **rpm_smd_clks;
 492         const struct rpm_smd_clk_desc *desc;
 493
 494         rpm = dev_get_drvdata(pdev->dev.parent);
 495         if (!rpm) {
 496                 dev_err(&pdev->dev, "Unable to retrieve handle to RPM\n");
 497                 return -ENODEV;
 498         }
 499
 500         desc = of_device_get_match_data(&pdev->dev);
 501         if (!desc)
 502                 return -EINVAL;
 503
 504         rpm_smd_clks = desc->clks;
 505         num_clks = desc->num_clks;
 506
 507         rcc = devm_kzalloc(&pdev->dev, sizeof(*rcc), GFP_KERNEL);
 508         if (!rcc)
 509                 return -ENOMEM;
 510
 511         rcc->clks = rpm_smd_clks;
 512         rcc->num_clks = num_clks;
 513
 514         for (i = 0; i < num_clks; i++) {
 515                 if (!rpm_smd_clks[i])
 516                         continue;
 517
 518                 rpm_smd_clks[i]->rpm = rpm;
 519
 520                 ret = clk_smd_rpm_handoff(rpm_smd_clks[i]);
 521                 if (ret)
 522                         goto err;
 523         }
 524
 525         ret = clk_smd_rpm_enable_scaling(rpm);
 526         if (ret)
 527                 goto err;
 528
 529         for (i = 0; i < num_clks; i++) {
 530                 if (!rpm_smd_clks[i])
 531                         continue;
 532
 533                 ret = devm_clk_hw_register(&pdev->dev, &rpm_smd_clks[i]->hw);
 534                 if (ret)
 535                         goto err;
 536         }
 537
 538         ret = of_clk_add_hw_provider(pdev->dev.of_node, qcom_smdrpm_clk_hw_get,
 539                                      rcc);
 540         if (ret)
 541                 goto err;
 542
 543         return 0;
 544 err:
 545         dev_err(&pdev->dev, "Error registering SMD clock driver (%d)\n", ret);
 546         return ret;
 547 }
 548
 549 static int rpm_smd_clk_remove(struct platform_device *pdev)
 550 {
 551         of_clk_del_provider(pdev->dev.of_node);
 552         return 0;
 553 }
 554
 555 static struct platform_driver rpm_smd_clk_driver = {
 556         .driver = {
 557                 .name = "qcom-clk-smd-rpm",
 558                 .of_match_table = rpm_smd_clk_match_table,
 559         },
 560         .probe = rpm_smd_clk_probe,
 561         .remove = rpm_smd_clk_remove,
 562 };
 563
 564 static int __init rpm_smd_clk_init(void)
 565 {
 566         return platform_driver_register(&rpm_smd_clk_driver);
 567 }
 568 core_initcall(rpm_smd_clk_init);
 569
 570 static void __exit rpm_smd_clk_exit(void)
 571 {
 572         platform_driver_unregister(&rpm_smd_clk_driver);
 573 }
 574 module_exit(rpm_smd_clk_exit);
 575
 576 MODULE_DESCRIPTION("Qualcomm RPM over SMD Clock Controller Driver");
 577 MODULE_LICENSE("GPL v2");
 578 MODULE_ALIAS("platform:qcom-clk-smd-rpm");