drivers/clk/clk-cdce706.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * TI CDCE706 programmable 3-PLL clock synthesizer driver
   4  *
   5  * Copyright (c) 2014 Cadence Design Systems Inc.
   6  *
   7  * Reference: https://www.ti.com/lit/ds/symlink/cdce706.pdf
   8  */
   9
  10 #include <linux/clk.h>
  11 #include <linux/clk-provider.h>
  12 #include <linux/delay.h>
  13 #include <linux/i2c.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/mod_devicetable.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/rational.h>
  19 #include <linux/regmap.h>
  20 #include <linux/slab.h>
  21
  22 #define CDCE706_CLKIN_CLOCK             10
  23 #define CDCE706_CLKIN_SOURCE            11
  24 #define CDCE706_PLL_M_LOW(pll)          (1 + 3 * (pll))
  25 #define CDCE706_PLL_N_LOW(pll)          (2 + 3 * (pll))
  26 #define CDCE706_PLL_HI(pll)             (3 + 3 * (pll))
  27 #define CDCE706_PLL_MUX                 3
  28 #define CDCE706_PLL_FVCO                6
  29 #define CDCE706_DIVIDER(div)            (13 + (div))
  30 #define CDCE706_CLKOUT(out)             (19 + (out))
  31
  32 #define CDCE706_CLKIN_CLOCK_MASK        0x10
  33 #define CDCE706_CLKIN_SOURCE_SHIFT      6
  34 #define CDCE706_CLKIN_SOURCE_MASK       0xc0
  35 #define CDCE706_CLKIN_SOURCE_LVCMOS     0x40
  36
  37 #define CDCE706_PLL_MUX_MASK(pll)       (0x80 >> (pll))
  38 #define CDCE706_PLL_LOW_M_MASK          0xff
  39 #define CDCE706_PLL_LOW_N_MASK          0xff
  40 #define CDCE706_PLL_HI_M_MASK           0x1
  41 #define CDCE706_PLL_HI_N_MASK           0x1e
  42 #define CDCE706_PLL_HI_N_SHIFT          1
  43 #define CDCE706_PLL_M_MAX               0x1ff
  44 #define CDCE706_PLL_N_MAX               0xfff
  45 #define CDCE706_PLL_FVCO_MASK(pll)      (0x80 >> (pll))
  46 #define CDCE706_PLL_FREQ_MIN             80000000
  47 #define CDCE706_PLL_FREQ_MAX            300000000
  48 #define CDCE706_PLL_FREQ_HI             180000000
  49
  50 #define CDCE706_DIVIDER_PLL(div)        (9 + (div) - ((div) > 2) - ((div) > 4))
  51 #define CDCE706_DIVIDER_PLL_SHIFT(div)  ((div) < 2 ? 5 : 3 * ((div) & 1))
  52 #define CDCE706_DIVIDER_PLL_MASK(div)   (0x7 << CDCE706_DIVIDER_PLL_SHIFT(div))
  53 #define CDCE706_DIVIDER_DIVIDER_MASK    0x7f
  54 #define CDCE706_DIVIDER_DIVIDER_MAX     0x7f
  55
  56 #define CDCE706_CLKOUT_DIVIDER_MASK     0x7
  57 #define CDCE706_CLKOUT_ENABLE_MASK      0x8
  58
  59 static const struct regmap_config cdce706_regmap_config = {
  60         .reg_bits = 8,
  61         .val_bits = 8,
  62         .val_format_endian = REGMAP_ENDIAN_NATIVE,
  63 };
  64
  65 #define to_hw_data(phw) (container_of((phw), struct cdce706_hw_data, hw))
  66
  67 struct cdce706_hw_data {
  68         struct cdce706_dev_data *dev_data;
  69         unsigned idx;
  70         unsigned parent;
  71         struct clk_hw hw;
  72         unsigned div;
  73         unsigned mul;
  74         unsigned mux;
  75 };
  76
  77 struct cdce706_dev_data {
  78         struct i2c_client *client;
  79         struct regmap *regmap;
  80         struct clk *clkin_clk[2];
  81         const char *clkin_name[2];
  82         struct cdce706_hw_data clkin[1];
  83         struct cdce706_hw_data pll[3];
  84         struct cdce706_hw_data divider[6];
  85         struct cdce706_hw_data clkout[6];
  86 };
  87
  88 static const char * const cdce706_source_name[] = {
  89         "clk_in0", "clk_in1",
  90 };
  91
  92 static const char * const cdce706_clkin_name[] = {
  93         "clk_in",
  94 };
  95
  96 static const char * const cdce706_pll_name[] = {
  97         "pll1", "pll2", "pll3",
  98 };
  99
 100 static const char * const cdce706_divider_parent_name[] = {
 101         "clk_in", "pll1", "pll2", "pll2", "pll3",
 102 };
 103
 104 static const char *cdce706_divider_name[] = {
 105         "p0", "p1", "p2", "p3", "p4", "p5",
 106 };
 107
 108 static const char * const cdce706_clkout_name[] = {
 109         "clk_out0", "clk_out1", "clk_out2", "clk_out3", "clk_out4", "clk_out5",
 110 };
 111
 112 static int cdce706_reg_read(struct cdce706_dev_data *dev_data, unsigned reg,
 113                             unsigned *val)
 114 {
 115         int rc = regmap_read(dev_data->regmap, reg | 0x80, val);
 116
 117         if (rc < 0)
 118                 dev_err(&dev_data->client->dev, "error reading reg %u", reg);
 119         return rc;
 120 }
 121
 122 static int cdce706_reg_write(struct cdce706_dev_data *dev_data, unsigned reg,
 123                              unsigned val)
 124 {
 125         int rc = regmap_write(dev_data->regmap, reg | 0x80, val);
 126
 127         if (rc < 0)
 128                 dev_err(&dev_data->client->dev, "error writing reg %u", reg);
 129         return rc;
 130 }
 131
 132 static int cdce706_reg_update(struct cdce706_dev_data *dev_data, unsigned reg,
 133                               unsigned mask, unsigned val)
 134 {
 135         int rc = regmap_update_bits(dev_data->regmap, reg | 0x80, mask, val);
 136
 137         if (rc < 0)
 138                 dev_err(&dev_data->client->dev, "error updating reg %u", reg);
 139         return rc;
 140 }
 141
 142 static int cdce706_clkin_set_parent(struct clk_hw *hw, u8 index)
 143 {
 144         struct cdce706_hw_data *hwd = to_hw_data(hw);
 145
 146         hwd->parent = index;
 147         return 0;
 148 }
 149
 150 static u8 cdce706_clkin_get_parent(struct clk_hw *hw)
 151 {
 152         struct cdce706_hw_data *hwd = to_hw_data(hw);
 153
 154         return hwd->parent;
 155 }
 156
 157 static const struct clk_ops cdce706_clkin_ops = {
 158         .determine_rate = clk_hw_determine_rate_no_reparent,
 159         .set_parent = cdce706_clkin_set_parent,
 160         .get_parent = cdce706_clkin_get_parent,
 161 };
 162
 163 static unsigned long cdce706_pll_recalc_rate(struct clk_hw *hw,
 164                                              unsigned long parent_rate)
 165 {
 166         struct cdce706_hw_data *hwd = to_hw_data(hw);
 167
 168         dev_dbg(&hwd->dev_data->client->dev,
 169                 "%s, pll: %d, mux: %d, mul: %u, div: %u\n",
 170                 __func__, hwd->idx, hwd->mux, hwd->mul, hwd->div);
 171
 172         if (!hwd->mux) {
 173                 if (hwd->div && hwd->mul) {
 174                         u64 res = (u64)parent_rate * hwd->mul;
 175
 176                         do_div(res, hwd->div);
 177                         return res;
 178                 }
 179         } else {
 180                 if (hwd->div)
 181                         return parent_rate / hwd->div;
 182         }
 183         return 0;
 184 }
 185
 186 static long cdce706_pll_round_rate(struct clk_hw *hw, unsigned long rate,
 187                                    unsigned long *parent_rate)
 188 {
 189         struct cdce706_hw_data *hwd = to_hw_data(hw);
 190         unsigned long mul, div;
 191         u64 res;
 192
 193         dev_dbg(&hwd->dev_data->client->dev,
 194                 "%s, rate: %lu, parent_rate: %lu\n",
 195                 __func__, rate, *parent_rate);
 196
 197         rational_best_approximation(rate, *parent_rate,
 198                                     CDCE706_PLL_N_MAX, CDCE706_PLL_M_MAX,
 199                                     &mul, &div);
 200         hwd->mul = mul;
 201         hwd->div = div;
 202
 203         dev_dbg(&hwd->dev_data->client->dev,
 204                 "%s, pll: %d, mul: %lu, div: %lu\n",
 205                 __func__, hwd->idx, mul, div);
 206
 207         res = (u64)*parent_rate * hwd->mul;
 208         do_div(res, hwd->div);
 209         return res;
 210 }
 211
 212 static int cdce706_pll_set_rate(struct clk_hw *hw, unsigned long rate,
 213                                 unsigned long parent_rate)
 214 {
 215         struct cdce706_hw_data *hwd = to_hw_data(hw);
 216         unsigned long mul = hwd->mul, div = hwd->div;
 217         int err;
 218
 219         dev_dbg(&hwd->dev_data->client->dev,
 220                 "%s, pll: %d, mul: %lu, div: %lu\n",
 221                 __func__, hwd->idx, mul, div);
 222
 223         err = cdce706_reg_update(hwd->dev_data,
 224                                  CDCE706_PLL_HI(hwd->idx),
 225                                  CDCE706_PLL_HI_M_MASK | CDCE706_PLL_HI_N_MASK,
 226                                  ((div >> 8) & CDCE706_PLL_HI_M_MASK) |
 227                                  ((mul >> (8 - CDCE706_PLL_HI_N_SHIFT)) &
 228                                   CDCE706_PLL_HI_N_MASK));
 229         if (err < 0)
 230                 return err;
 231
 232         err = cdce706_reg_write(hwd->dev_data,
 233                                 CDCE706_PLL_M_LOW(hwd->idx),
 234                                 div & CDCE706_PLL_LOW_M_MASK);
 235         if (err < 0)
 236                 return err;
 237
 238         err = cdce706_reg_write(hwd->dev_data,
 239                                 CDCE706_PLL_N_LOW(hwd->idx),
 240                                 mul & CDCE706_PLL_LOW_N_MASK);
 241         if (err < 0)
 242                 return err;
 243
 244         err = cdce706_reg_update(hwd->dev_data,
 245                                  CDCE706_PLL_FVCO,
 246                                  CDCE706_PLL_FVCO_MASK(hwd->idx),
 247                                  rate > CDCE706_PLL_FREQ_HI ?
 248                                  CDCE706_PLL_FVCO_MASK(hwd->idx) : 0);
 249         return err;
 250 }
 251
 252 static const struct clk_ops cdce706_pll_ops = {
 253         .recalc_rate = cdce706_pll_recalc_rate,
 254         .round_rate = cdce706_pll_round_rate,
 255         .set_rate = cdce706_pll_set_rate,
 256 };
 257
 258 static int cdce706_divider_set_parent(struct clk_hw *hw, u8 index)
 259 {
 260         struct cdce706_hw_data *hwd = to_hw_data(hw);
 261
 262         if (hwd->parent == index)
 263                 return 0;
 264         hwd->parent = index;
 265         return cdce706_reg_update(hwd->dev_data,
 266                                   CDCE706_DIVIDER_PLL(hwd->idx),
 267                                   CDCE706_DIVIDER_PLL_MASK(hwd->idx),
 268                                   index << CDCE706_DIVIDER_PLL_SHIFT(hwd->idx));
 269 }
 270
 271 static u8 cdce706_divider_get_parent(struct clk_hw *hw)
 272 {
 273         struct cdce706_hw_data *hwd = to_hw_data(hw);
 274
 275         return hwd->parent;
 276 }
 277
 278 static unsigned long cdce706_divider_recalc_rate(struct clk_hw *hw,
 279                                                  unsigned long parent_rate)
 280 {
 281         struct cdce706_hw_data *hwd = to_hw_data(hw);
 282
 283         dev_dbg(&hwd->dev_data->client->dev,
 284                 "%s, divider: %d, div: %u\n",
 285                 __func__, hwd->idx, hwd->div);
 286         if (hwd->div)
 287                 return parent_rate / hwd->div;
 288         return 0;
 289 }
 290
 291 static int cdce706_divider_determine_rate(struct clk_hw *hw,
 292                                           struct clk_rate_request *req)
 293 {
 294         struct cdce706_hw_data *hwd = to_hw_data(hw);
 295         struct cdce706_dev_data *cdce = hwd->dev_data;
 296         unsigned long rate = req->rate;
 297         unsigned long mul, div;
 298
 299         dev_dbg(&hwd->dev_data->client->dev,
 300                 "%s, rate: %lu, parent_rate: %lu\n",
 301                 __func__, rate, req->best_parent_rate);
 302
 303         rational_best_approximation(rate, req->best_parent_rate,
 304                                     1, CDCE706_DIVIDER_DIVIDER_MAX,
 305                                     &mul, &div);
 306         if (!mul)
 307                 div = CDCE706_DIVIDER_DIVIDER_MAX;
 308
 309         if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) {
 310                 unsigned long best_diff = rate;
 311                 unsigned long best_div = 0;
 312                 struct clk *gp_clk = cdce->clkin_clk[cdce->clkin[0].parent];
 313                 unsigned long gp_rate = gp_clk ? clk_get_rate(gp_clk) : 0;
 314
 315                 for (div = CDCE706_PLL_FREQ_MIN / rate; best_diff &&
 316                      div <= CDCE706_PLL_FREQ_MAX / rate; ++div) {
 317                         unsigned long n, m;
 318                         unsigned long diff;
 319                         unsigned long div_rate;
 320                         u64 div_rate64;
 321
 322                         if (rate * div < CDCE706_PLL_FREQ_MIN)
 323                                 continue;
 324
 325                         rational_best_approximation(rate * div, gp_rate,
 326                                                     CDCE706_PLL_N_MAX,
 327                                                     CDCE706_PLL_M_MAX,
 328                                                     &n, &m);
 329                         div_rate64 = (u64)gp_rate * n;
 330                         do_div(div_rate64, m);
 331                         do_div(div_rate64, div);
 332                         div_rate = div_rate64;
 333                         diff = max(div_rate, rate) - min(div_rate, rate);
 334
 335                         if (diff < best_diff) {
 336                                 best_diff = diff;
 337                                 best_div = div;
 338                                 dev_dbg(&hwd->dev_data->client->dev,
 339                                         "%s, %lu * %lu / %lu / %lu = %lu\n",
 340                                         __func__, gp_rate, n, m, div, div_rate);
 341                         }
 342                 }
 343
 344                 div = best_div;
 345
 346                 dev_dbg(&hwd->dev_data->client->dev,
 347                         "%s, altering parent rate: %lu -> %lu\n",
 348                         __func__, req->best_parent_rate, rate * div);
 349                 req->best_parent_rate = rate * div;
 350         }
 351         hwd->div = div;
 352
 353         dev_dbg(&hwd->dev_data->client->dev,
 354                 "%s, divider: %d, div: %lu\n",
 355                 __func__, hwd->idx, div);
 356
 357         req->rate = req->best_parent_rate / div;
 358         return 0;
 359 }
 360
 361 static int cdce706_divider_set_rate(struct clk_hw *hw, unsigned long rate,
 362                                     unsigned long parent_rate)
 363 {
 364         struct cdce706_hw_data *hwd = to_hw_data(hw);
 365
 366         dev_dbg(&hwd->dev_data->client->dev,
 367                 "%s, divider: %d, div: %u\n",
 368                 __func__, hwd->idx, hwd->div);
 369
 370         return cdce706_reg_update(hwd->dev_data,
 371                                   CDCE706_DIVIDER(hwd->idx),
 372                                   CDCE706_DIVIDER_DIVIDER_MASK,
 373                                   hwd->div);
 374 }
 375
 376 static const struct clk_ops cdce706_divider_ops = {
 377         .set_parent = cdce706_divider_set_parent,
 378         .get_parent = cdce706_divider_get_parent,
 379         .recalc_rate = cdce706_divider_recalc_rate,
 380         .determine_rate = cdce706_divider_determine_rate,
 381         .set_rate = cdce706_divider_set_rate,
 382 };
 383
 384 static int cdce706_clkout_prepare(struct clk_hw *hw)
 385 {
 386         struct cdce706_hw_data *hwd = to_hw_data(hw);
 387
 388         return cdce706_reg_update(hwd->dev_data, CDCE706_CLKOUT(hwd->idx),
 389                                   CDCE706_CLKOUT_ENABLE_MASK,
 390                                   CDCE706_CLKOUT_ENABLE_MASK);
 391 }
 392
 393 static void cdce706_clkout_unprepare(struct clk_hw *hw)
 394 {
 395         struct cdce706_hw_data *hwd = to_hw_data(hw);
 396
 397         cdce706_reg_update(hwd->dev_data, CDCE706_CLKOUT(hwd->idx),
 398                            CDCE706_CLKOUT_ENABLE_MASK, 0);
 399 }
 400
 401 static int cdce706_clkout_set_parent(struct clk_hw *hw, u8 index)
 402 {
 403         struct cdce706_hw_data *hwd = to_hw_data(hw);
 404
 405         if (hwd->parent == index)
 406                 return 0;
 407         hwd->parent = index;
 408         return cdce706_reg_update(hwd->dev_data,
 409                                   CDCE706_CLKOUT(hwd->idx),
 410                                   CDCE706_CLKOUT_ENABLE_MASK, index);
 411 }
 412
 413 static u8 cdce706_clkout_get_parent(struct clk_hw *hw)
 414 {
 415         struct cdce706_hw_data *hwd = to_hw_data(hw);
 416
 417         return hwd->parent;
 418 }
 419
 420 static unsigned long cdce706_clkout_recalc_rate(struct clk_hw *hw,
 421                                                 unsigned long parent_rate)
 422 {
 423         return parent_rate;
 424 }
 425
 426 static int cdce706_clkout_determine_rate(struct clk_hw *hw,
 427                                          struct clk_rate_request *req)
 428 {
 429         req->best_parent_rate = req->rate;
 430
 431         return 0;
 432 }
 433
 434 static int cdce706_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
 435                                    unsigned long parent_rate)
 436 {
 437         return 0;
 438 }
 439
 440 static const struct clk_ops cdce706_clkout_ops = {
 441         .prepare = cdce706_clkout_prepare,
 442         .unprepare = cdce706_clkout_unprepare,
 443         .set_parent = cdce706_clkout_set_parent,
 444         .get_parent = cdce706_clkout_get_parent,
 445         .recalc_rate = cdce706_clkout_recalc_rate,
 446         .determine_rate = cdce706_clkout_determine_rate,
 447         .set_rate = cdce706_clkout_set_rate,
 448 };
 449
 450 static int cdce706_register_hw(struct cdce706_dev_data *cdce,
 451                                struct cdce706_hw_data *hw, unsigned num_hw,
 452                                const char * const *clk_names,
 453                                struct clk_init_data *init)
 454 {
 455         unsigned i;
 456         int ret;
 457
 458         for (i = 0; i < num_hw; ++i, ++hw) {
 459                 init->name = clk_names[i];
 460                 hw->dev_data = cdce;
 461                 hw->idx = i;
 462                 hw->hw.init = init;
 463                 ret = devm_clk_hw_register(&cdce->client->dev,
 464                                             &hw->hw);
 465                 if (ret) {
 466                         dev_err(&cdce->client->dev, "Failed to register %s\n",
 467                                 clk_names[i]);
 468                         return ret;
 469                 }
 470         }
 471         return 0;
 472 }
 473
 474 static int cdce706_register_clkin(struct cdce706_dev_data *cdce)
 475 {
 476         struct clk_init_data init = {
 477                 .ops = &cdce706_clkin_ops,
 478                 .parent_names = cdce->clkin_name,
 479                 .num_parents = ARRAY_SIZE(cdce->clkin_name),
 480         };
 481         unsigned i;
 482         int ret;
 483         unsigned clock, source;
 484
 485         for (i = 0; i < ARRAY_SIZE(cdce->clkin_name); ++i) {
 486                 struct clk *parent = devm_clk_get(&cdce->client->dev,
 487                                                   cdce706_source_name[i]);
 488
 489                 if (IS_ERR(parent)) {
 490                         cdce->clkin_name[i] = cdce706_source_name[i];
 491                 } else {
 492                         cdce->clkin_name[i] = __clk_get_name(parent);
 493                         cdce->clkin_clk[i] = parent;
 494                 }
 495         }
 496
 497         ret = cdce706_reg_read(cdce, CDCE706_CLKIN_SOURCE, &source);
 498         if (ret < 0)
 499                 return ret;
 500         if ((source & CDCE706_CLKIN_SOURCE_MASK) ==
 501             CDCE706_CLKIN_SOURCE_LVCMOS) {
 502                 ret = cdce706_reg_read(cdce, CDCE706_CLKIN_CLOCK, &clock);
 503                 if (ret < 0)
 504                         return ret;
 505                 cdce->clkin[0].parent = !!(clock & CDCE706_CLKIN_CLOCK_MASK);
 506         }
 507
 508         ret = cdce706_register_hw(cdce, cdce->clkin,
 509                                   ARRAY_SIZE(cdce->clkin),
 510                                   cdce706_clkin_name, &init);
 511         return ret;
 512 }
 513
 514 static int cdce706_register_plls(struct cdce706_dev_data *cdce)
 515 {
 516         struct clk_init_data init = {
 517                 .ops = &cdce706_pll_ops,
 518                 .parent_names = cdce706_clkin_name,
 519                 .num_parents = ARRAY_SIZE(cdce706_clkin_name),
 520         };
 521         unsigned i;
 522         int ret;
 523         unsigned mux;
 524
 525         ret = cdce706_reg_read(cdce, CDCE706_PLL_MUX, &mux);
 526         if (ret < 0)
 527                 return ret;
 528
 529         for (i = 0; i < ARRAY_SIZE(cdce->pll); ++i) {
 530                 unsigned m, n, v;
 531
 532                 ret = cdce706_reg_read(cdce, CDCE706_PLL_M_LOW(i), &m);
 533                 if (ret < 0)
 534                         return ret;
 535                 ret = cdce706_reg_read(cdce, CDCE706_PLL_N_LOW(i), &n);
 536                 if (ret < 0)
 537                         return ret;
 538                 ret = cdce706_reg_read(cdce, CDCE706_PLL_HI(i), &v);
 539                 if (ret < 0)
 540                         return ret;
 541                 cdce->pll[i].div = m | ((v & CDCE706_PLL_HI_M_MASK) << 8);
 542                 cdce->pll[i].mul = n | ((v & CDCE706_PLL_HI_N_MASK) <<
 543                                         (8 - CDCE706_PLL_HI_N_SHIFT));
 544                 cdce->pll[i].mux = mux & CDCE706_PLL_MUX_MASK(i);
 545                 dev_dbg(&cdce->client->dev,
 546                         "%s: i: %u, div: %u, mul: %u, mux: %d\n", __func__, i,
 547                         cdce->pll[i].div, cdce->pll[i].mul, cdce->pll[i].mux);
 548         }
 549
 550         ret = cdce706_register_hw(cdce, cdce->pll,
 551                                   ARRAY_SIZE(cdce->pll),
 552                                   cdce706_pll_name, &init);
 553         return ret;
 554 }
 555
 556 static int cdce706_register_dividers(struct cdce706_dev_data *cdce)
 557 {
 558         struct clk_init_data init = {
 559                 .ops = &cdce706_divider_ops,
 560                 .parent_names = cdce706_divider_parent_name,
 561                 .num_parents = ARRAY_SIZE(cdce706_divider_parent_name),
 562                 .flags = CLK_SET_RATE_PARENT,
 563         };
 564         unsigned i;
 565         int ret;
 566
 567         for (i = 0; i < ARRAY_SIZE(cdce->divider); ++i) {
 568                 unsigned val;
 569
 570                 ret = cdce706_reg_read(cdce, CDCE706_DIVIDER_PLL(i), &val);
 571                 if (ret < 0)
 572                         return ret;
 573                 cdce->divider[i].parent =
 574                         (val & CDCE706_DIVIDER_PLL_MASK(i)) >>
 575                         CDCE706_DIVIDER_PLL_SHIFT(i);
 576
 577                 ret = cdce706_reg_read(cdce, CDCE706_DIVIDER(i), &val);
 578                 if (ret < 0)
 579                         return ret;
 580                 cdce->divider[i].div = val & CDCE706_DIVIDER_DIVIDER_MASK;
 581                 dev_dbg(&cdce->client->dev,
 582                         "%s: i: %u, parent: %u, div: %u\n", __func__, i,
 583                         cdce->divider[i].parent, cdce->divider[i].div);
 584         }
 585
 586         ret = cdce706_register_hw(cdce, cdce->divider,
 587                                   ARRAY_SIZE(cdce->divider),
 588                                   cdce706_divider_name, &init);
 589         return ret;
 590 }
 591
 592 static int cdce706_register_clkouts(struct cdce706_dev_data *cdce)
 593 {
 594         struct clk_init_data init = {
 595                 .ops = &cdce706_clkout_ops,
 596                 .parent_names = cdce706_divider_name,
 597                 .num_parents = ARRAY_SIZE(cdce706_divider_name),
 598                 .flags = CLK_SET_RATE_PARENT,
 599         };
 600         unsigned i;
 601         int ret;
 602
 603         for (i = 0; i < ARRAY_SIZE(cdce->clkout); ++i) {
 604                 unsigned val;
 605
 606                 ret = cdce706_reg_read(cdce, CDCE706_CLKOUT(i), &val);
 607                 if (ret < 0)
 608                         return ret;
 609                 cdce->clkout[i].parent = val & CDCE706_CLKOUT_DIVIDER_MASK;
 610                 dev_dbg(&cdce->client->dev,
 611                         "%s: i: %u, parent: %u\n", __func__, i,
 612                         cdce->clkout[i].parent);
 613         }
 614
 615         return cdce706_register_hw(cdce, cdce->clkout,
 616                                    ARRAY_SIZE(cdce->clkout),
 617                                    cdce706_clkout_name, &init);
 618 }
 619
 620 static struct clk_hw *
 621 of_clk_cdce_get(struct of_phandle_args *clkspec, void *data)
 622 {
 623         struct cdce706_dev_data *cdce = data;
 624         unsigned int idx = clkspec->args[0];
 625
 626         if (idx >= ARRAY_SIZE(cdce->clkout)) {
 627                 pr_err("%s: invalid index %u\n", __func__, idx);
 628                 return ERR_PTR(-EINVAL);
 629         }
 630
 631         return &cdce->clkout[idx].hw;
 632 }
 633
 634 static int cdce706_probe(struct i2c_client *client)
 635 {
 636         struct i2c_adapter *adapter = client->adapter;
 637         struct cdce706_dev_data *cdce;
 638         int ret;
 639
 640         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 641                 return -EIO;
 642
 643         cdce = devm_kzalloc(&client->dev, sizeof(*cdce), GFP_KERNEL);
 644         if (!cdce)
 645                 return -ENOMEM;
 646
 647         cdce->client = client;
 648         cdce->regmap = devm_regmap_init_i2c(client, &cdce706_regmap_config);
 649         if (IS_ERR(cdce->regmap)) {
 650                 dev_err(&client->dev, "Failed to initialize regmap\n");
 651                 return -EINVAL;
 652         }
 653
 654         i2c_set_clientdata(client, cdce);
 655
 656         ret = cdce706_register_clkin(cdce);
 657         if (ret < 0)
 658                 return ret;
 659         ret = cdce706_register_plls(cdce);
 660         if (ret < 0)
 661                 return ret;
 662         ret = cdce706_register_dividers(cdce);
 663         if (ret < 0)
 664                 return ret;
 665         ret = cdce706_register_clkouts(cdce);
 666         if (ret < 0)
 667                 return ret;
 668         return devm_of_clk_add_hw_provider(&client->dev, of_clk_cdce_get,
 669                                            cdce);
 670 }
 671
 672 #ifdef CONFIG_OF
 673 static const struct of_device_id cdce706_dt_match[] = {
 674         { .compatible = "ti,cdce706" },
 675         { },
 676 };
 677 MODULE_DEVICE_TABLE(of, cdce706_dt_match);
 678 #endif
 679
 680 static const struct i2c_device_id cdce706_id[] = {
 681         { "cdce706", 0 },
 682         { }
 683 };
 684 MODULE_DEVICE_TABLE(i2c, cdce706_id);
 685
 686 static struct i2c_driver cdce706_i2c_driver = {
 687         .driver = {
 688                 .name   = "cdce706",
 689                 .of_match_table = of_match_ptr(cdce706_dt_match),
 690         },
 691         .probe          = cdce706_probe,
 692         .id_table       = cdce706_id,
 693 };
 694 module_i2c_driver(cdce706_i2c_driver);
 695
 696 MODULE_AUTHOR("Max Filippov <jcmvbkbc@gmail.com>");
 697 MODULE_DESCRIPTION("TI CDCE 706 clock synthesizer driver");
 698 MODULE_LICENSE("GPL");