root/drivers/clk/clk-cdce925.c

DEFINITIONS

1. cdce925_pll_calculate_rate
2. cdce925_pll_recalc_rate
3. cdce925_pll_find_rate
4. cdce925_pll_round_rate
5. cdce925_pll_set_rate
6. cdce925_pll_calc_p
7. cdce925_pll_calc_range_bits
8. cdce925_pll_prepare
9. cdce925_pll_unprepare
10. cdce925_clk_set_pdiv
11. cdce925_clk_activate
12. cdce925_clk_prepare
13. cdce925_clk_unprepare
14. cdce925_clk_recalc_rate
15. cdce925_calc_divider
16. cdce925_clk_best_parent_rate
17. cdce925_clk_round_rate
18. cdce925_clk_set_rate
19. cdce925_y1_calc_divider
20. cdce925_clk_y1_round_rate
21. cdce925_clk_y1_set_rate
22. cdce925_regmap_i2c_write
23. cdce925_regmap_i2c_read
24. of_clk_cdce925_get
25. cdce925_regulator_disable
26. cdce925_regulator_enable
27. cdce925_probe

   1 /*
   2  * Driver for TI Multi PLL CDCE913/925/937/949 clock synthesizer
   3  *
   4  * This driver always connects the Y1 to the input clock, Y2/Y3 to PLL1,
   5  * Y4/Y5 to PLL2, and so on. PLL frequency is set on a first-come-first-serve
   6  * basis. Clients can directly request any frequency that the chip can
   7  * deliver using the standard clk framework. In addition, the device can
   8  * be configured and activated via the devicetree.
   9  *
  10  * Copyright (C) 2014, Topic Embedded Products
  11  * Licenced under GPL
  12  */
  13 #include <linux/clk.h>
  14 #include <linux/clk-provider.h>
  15 #include <linux/delay.h>
  16 #include <linux/module.h>
  17 #include <linux/i2c.h>
  18 #include <linux/regmap.h>
  19 #include <linux/regulator/consumer.h>
  20 #include <linux/slab.h>
  21 #include <linux/gcd.h>
  22 
  23 /* Each chip has different number of PLLs and outputs, for example:
  24  * The CECE925 has 2 PLLs which can be routed through dividers to 5 outputs.
  25  * Model this as 2 PLL clocks which are parents to the outputs.
  26  */
  27 
  28 enum {
  29         CDCE913,
  30         CDCE925,
  31         CDCE937,
  32         CDCE949,
  33 };
  34 
  35 struct clk_cdce925_chip_info {
  36         int num_plls;
  37         int num_outputs;
  38 };
  39 
  40 static const struct clk_cdce925_chip_info clk_cdce925_chip_info_tbl[] = {
  41         [CDCE913] = { .num_plls = 1, .num_outputs = 3 },
  42         [CDCE925] = { .num_plls = 2, .num_outputs = 5 },
  43         [CDCE937] = { .num_plls = 3, .num_outputs = 7 },
  44         [CDCE949] = { .num_plls = 4, .num_outputs = 9 },
  45 };
  46 
  47 #define MAX_NUMBER_OF_PLLS      4
  48 #define MAX_NUMBER_OF_OUTPUTS   9
  49 
  50 #define CDCE925_REG_GLOBAL1     0x01
  51 #define CDCE925_REG_Y1SPIPDIVH  0x02
  52 #define CDCE925_REG_PDIVL       0x03
  53 #define CDCE925_REG_XCSEL       0x05
  54 /* PLL parameters start at 0x10, steps of 0x10 */
  55 #define CDCE925_OFFSET_PLL      0x10
  56 /* Add CDCE925_OFFSET_PLL * (pll) to these registers before sending */
  57 #define CDCE925_PLL_MUX_OUTPUTS 0x14
  58 #define CDCE925_PLL_MULDIV      0x18
  59 
  60 #define CDCE925_PLL_FREQUENCY_MIN        80000000ul
  61 #define CDCE925_PLL_FREQUENCY_MAX       230000000ul
  62 struct clk_cdce925_chip;
  63 
  64 struct clk_cdce925_output {
  65         struct clk_hw hw;
  66         struct clk_cdce925_chip *chip;
  67         u8 index;
  68         u16 pdiv; /* 1..127 for Y2-Y9; 1..1023 for Y1 */
  69 };
  70 #define to_clk_cdce925_output(_hw) \
  71         container_of(_hw, struct clk_cdce925_output, hw)
  72 
  73 struct clk_cdce925_pll {
  74         struct clk_hw hw;
  75         struct clk_cdce925_chip *chip;
  76         u8 index;
  77         u16 m;   /* 1..511 */
  78         u16 n;   /* 1..4095 */
  79 };
  80 #define to_clk_cdce925_pll(_hw) container_of(_hw, struct clk_cdce925_pll, hw)
  81 
  82 struct clk_cdce925_chip {
  83         struct regmap *regmap;
  84         struct i2c_client *i2c_client;
  85         const struct clk_cdce925_chip_info *chip_info;
  86         struct clk_cdce925_pll pll[MAX_NUMBER_OF_PLLS];
  87         struct clk_cdce925_output clk[MAX_NUMBER_OF_OUTPUTS];
  88 };
  89 
  90 /* ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** */
  91 
  92 static unsigned long cdce925_pll_calculate_rate(unsigned long parent_rate,
  93         u16 n, u16 m)
  94 {
  95         if ((!m || !n) || (m == n))
  96                 return parent_rate; /* In bypass mode runs at same frequency */
  97         return mult_frac(parent_rate, (unsigned long)n, (unsigned long)m);
  98 }
  99 
 100 static unsigned long cdce925_pll_recalc_rate(struct clk_hw *hw,
 101                 unsigned long parent_rate)
 102 {
 103         /* Output frequency of PLL is Fout = (Fin/Pdiv)*(N/M) */
 104         struct clk_cdce925_pll *data = to_clk_cdce925_pll(hw);
 105 
 106         return cdce925_pll_calculate_rate(parent_rate, data->n, data->m);
 107 }
 108 
 109 static void cdce925_pll_find_rate(unsigned long rate,
 110                 unsigned long parent_rate, u16 *n, u16 *m)
 111 {
 112         unsigned long un;
 113         unsigned long um;
 114         unsigned long g;
 115 
 116         if (rate <= parent_rate) {
 117                 /* Can always deliver parent_rate in bypass mode */
 118                 rate = parent_rate;
 119                 *n = 0;
 120                 *m = 0;
 121         } else {
 122                 /* In PLL mode, need to apply min/max range */
 123                 if (rate < CDCE925_PLL_FREQUENCY_MIN)
 124                         rate = CDCE925_PLL_FREQUENCY_MIN;
 125                 else if (rate > CDCE925_PLL_FREQUENCY_MAX)
 126                         rate = CDCE925_PLL_FREQUENCY_MAX;
 127 
 128                 g = gcd(rate, parent_rate);
 129                 um = parent_rate / g;
 130                 un = rate / g;
 131                 /* When outside hw range, reduce to fit (rounding errors) */
 132                 while ((un > 4095) || (um > 511)) {
 133                         un >>= 1;
 134                         um >>= 1;
 135                 }
 136                 if (un == 0)
 137                         un = 1;
 138                 if (um == 0)
 139                         um = 1;
 140 
 141                 *n = un;
 142                 *m = um;
 143         }
 144 }
 145 
 146 static long cdce925_pll_round_rate(struct clk_hw *hw, unsigned long rate,
 147                 unsigned long *parent_rate)
 148 {
 149         u16 n, m;
 150 
 151         cdce925_pll_find_rate(rate, *parent_rate, &n, &m);
 152         return (long)cdce925_pll_calculate_rate(*parent_rate, n, m);
 153 }
 154 
 155 static int cdce925_pll_set_rate(struct clk_hw *hw, unsigned long rate,
 156                 unsigned long parent_rate)
 157 {
 158         struct clk_cdce925_pll *data = to_clk_cdce925_pll(hw);
 159 
 160         if (!rate || (rate == parent_rate)) {
 161                 data->m = 0; /* Bypass mode */
 162                 data->n = 0;
 163                 return 0;
 164         }
 165 
 166         if ((rate < CDCE925_PLL_FREQUENCY_MIN) ||
 167                 (rate > CDCE925_PLL_FREQUENCY_MAX)) {
 168                 pr_debug("%s: rate %lu outside PLL range.\n", __func__, rate);
 169                 return -EINVAL;
 170         }
 171 
 172         if (rate < parent_rate) {
 173                 pr_debug("%s: rate %lu less than parent rate %lu.\n", __func__,
 174                         rate, parent_rate);
 175                 return -EINVAL;
 176         }
 177 
 178         cdce925_pll_find_rate(rate, parent_rate, &data->n, &data->m);
 179         return 0;
 180 }
 181 
 182 
 183 /* calculate p = max(0, 4 - int(log2 (n/m))) */
 184 static u8 cdce925_pll_calc_p(u16 n, u16 m)
 185 {
 186         u8 p;
 187         u16 r = n / m;
 188 
 189         if (r >= 16)
 190                 return 0;
 191         p = 4;
 192         while (r > 1) {
 193                 r >>= 1;
 194                 --p;
 195         }
 196         return p;
 197 }
 198 
 199 /* Returns VCO range bits for VCO1_0_RANGE */
 200 static u8 cdce925_pll_calc_range_bits(struct clk_hw *hw, u16 n, u16 m)
 201 {
 202         struct clk *parent = clk_get_parent(hw->clk);
 203         unsigned long rate = clk_get_rate(parent);
 204 
 205         rate = mult_frac(rate, (unsigned long)n, (unsigned long)m);
 206         if (rate >= 175000000)
 207                 return 0x3;
 208         if (rate >= 150000000)
 209                 return 0x02;
 210         if (rate >= 125000000)
 211                 return 0x01;
 212         return 0x00;
 213 }
 214 
 215 /* I2C clock, hence everything must happen in (un)prepare because this
 216  * may sleep */
 217 static int cdce925_pll_prepare(struct clk_hw *hw)
 218 {
 219         struct clk_cdce925_pll *data = to_clk_cdce925_pll(hw);
 220         u16 n = data->n;
 221         u16 m = data->m;
 222         u16 r;
 223         u8 q;
 224         u8 p;
 225         u16 nn;
 226         u8 pll[4]; /* Bits are spread out over 4 byte registers */
 227         u8 reg_ofs = data->index * CDCE925_OFFSET_PLL;
 228         unsigned i;
 229 
 230         if ((!m || !n) || (m == n)) {
 231                 /* Set PLL mux to bypass mode, leave the rest as is */
 232                 regmap_update_bits(data->chip->regmap,
 233                         reg_ofs + CDCE925_PLL_MUX_OUTPUTS, 0x80, 0x80);
 234         } else {
 235                 /* According to data sheet: */
 236                 /* p = max(0, 4 - int(log2 (n/m))) */
 237                 p = cdce925_pll_calc_p(n, m);
 238                 /* nn = n * 2^p */
 239                 nn = n * BIT(p);
 240                 /* q = int(nn/m) */
 241                 q = nn / m;
 242                 if ((q < 16) || (q > 63)) {
 243                         pr_debug("%s invalid q=%d\n", __func__, q);
 244                         return -EINVAL;
 245                 }
 246                 r = nn - (m*q);
 247                 if (r > 511) {
 248                         pr_debug("%s invalid r=%d\n", __func__, r);
 249                         return -EINVAL;
 250                 }
 251                 pr_debug("%s n=%d m=%d p=%d q=%d r=%d\n", __func__,
 252                         n, m, p, q, r);
 253                 /* encode into register bits */
 254                 pll[0] = n >> 4;
 255                 pll[1] = ((n & 0x0F) << 4) | ((r >> 5) & 0x0F);
 256                 pll[2] = ((r & 0x1F) << 3) | ((q >> 3) & 0x07);
 257                 pll[3] = ((q & 0x07) << 5) | (p << 2) |
 258                                 cdce925_pll_calc_range_bits(hw, n, m);
 259                 /* Write to registers */
 260                 for (i = 0; i < ARRAY_SIZE(pll); ++i)
 261                         regmap_write(data->chip->regmap,
 262                                 reg_ofs + CDCE925_PLL_MULDIV + i, pll[i]);
 263                 /* Enable PLL */
 264                 regmap_update_bits(data->chip->regmap,
 265                         reg_ofs + CDCE925_PLL_MUX_OUTPUTS, 0x80, 0x00);
 266         }
 267 
 268         return 0;
 269 }
 270 
 271 static void cdce925_pll_unprepare(struct clk_hw *hw)
 272 {
 273         struct clk_cdce925_pll *data = to_clk_cdce925_pll(hw);
 274         u8 reg_ofs = data->index * CDCE925_OFFSET_PLL;
 275 
 276         regmap_update_bits(data->chip->regmap,
 277                         reg_ofs + CDCE925_PLL_MUX_OUTPUTS, 0x80, 0x80);
 278 }
 279 
 280 static const struct clk_ops cdce925_pll_ops = {
 281         .prepare = cdce925_pll_prepare,
 282         .unprepare = cdce925_pll_unprepare,
 283         .recalc_rate = cdce925_pll_recalc_rate,
 284         .round_rate = cdce925_pll_round_rate,
 285         .set_rate = cdce925_pll_set_rate,
 286 };
 287 
 288 
 289 static void cdce925_clk_set_pdiv(struct clk_cdce925_output *data, u16 pdiv)
 290 {
 291         switch (data->index) {
 292         case 0:
 293                 regmap_update_bits(data->chip->regmap,
 294                         CDCE925_REG_Y1SPIPDIVH,
 295                         0x03, (pdiv >> 8) & 0x03);
 296                 regmap_write(data->chip->regmap, 0x03, pdiv & 0xFF);
 297                 break;
 298         case 1:
 299                 regmap_update_bits(data->chip->regmap, 0x16, 0x7F, pdiv);
 300                 break;
 301         case 2:
 302                 regmap_update_bits(data->chip->regmap, 0x17, 0x7F, pdiv);
 303                 break;
 304         case 3:
 305                 regmap_update_bits(data->chip->regmap, 0x26, 0x7F, pdiv);
 306                 break;
 307         case 4:
 308                 regmap_update_bits(data->chip->regmap, 0x27, 0x7F, pdiv);
 309                 break;
 310         case 5:
 311                 regmap_update_bits(data->chip->regmap, 0x36, 0x7F, pdiv);
 312                 break;
 313         case 6:
 314                 regmap_update_bits(data->chip->regmap, 0x37, 0x7F, pdiv);
 315                 break;
 316         case 7:
 317                 regmap_update_bits(data->chip->regmap, 0x46, 0x7F, pdiv);
 318                 break;
 319         case 8:
 320                 regmap_update_bits(data->chip->regmap, 0x47, 0x7F, pdiv);
 321                 break;
 322         }
 323 }
 324 
 325 static void cdce925_clk_activate(struct clk_cdce925_output *data)
 326 {
 327         switch (data->index) {
 328         case 0:
 329                 regmap_update_bits(data->chip->regmap,
 330                         CDCE925_REG_Y1SPIPDIVH, 0x0c, 0x0c);
 331                 break;
 332         case 1:
 333         case 2:
 334                 regmap_update_bits(data->chip->regmap, 0x14, 0x03, 0x03);
 335                 break;
 336         case 3:
 337         case 4:
 338                 regmap_update_bits(data->chip->regmap, 0x24, 0x03, 0x03);
 339                 break;
 340         case 5:
 341         case 6:
 342                 regmap_update_bits(data->chip->regmap, 0x34, 0x03, 0x03);
 343                 break;
 344         case 7:
 345         case 8:
 346                 regmap_update_bits(data->chip->regmap, 0x44, 0x03, 0x03);
 347                 break;
 348         }
 349 }
 350 
 351 static int cdce925_clk_prepare(struct clk_hw *hw)
 352 {
 353         struct clk_cdce925_output *data = to_clk_cdce925_output(hw);
 354 
 355         cdce925_clk_set_pdiv(data, data->pdiv);
 356         cdce925_clk_activate(data);
 357         return 0;
 358 }
 359 
 360 static void cdce925_clk_unprepare(struct clk_hw *hw)
 361 {
 362         struct clk_cdce925_output *data = to_clk_cdce925_output(hw);
 363 
 364         /* Disable clock by setting divider to "0" */
 365         cdce925_clk_set_pdiv(data, 0);
 366 }
 367 
 368 static unsigned long cdce925_clk_recalc_rate(struct clk_hw *hw,
 369                 unsigned long parent_rate)
 370 {
 371         struct clk_cdce925_output *data = to_clk_cdce925_output(hw);
 372 
 373         if (data->pdiv)
 374                 return parent_rate / data->pdiv;
 375         return 0;
 376 }
 377 
 378 static u16 cdce925_calc_divider(unsigned long rate,
 379                 unsigned long parent_rate)
 380 {
 381         unsigned long divider;
 382 
 383         if (!rate)
 384                 return 0;
 385         if (rate >= parent_rate)
 386                 return 1;
 387 
 388         divider = DIV_ROUND_CLOSEST(parent_rate, rate);
 389         if (divider > 0x7F)
 390                 divider = 0x7F;
 391 
 392         return (u16)divider;
 393 }
 394 
 395 static unsigned long cdce925_clk_best_parent_rate(
 396         struct clk_hw *hw, unsigned long rate)
 397 {
 398         struct clk *pll = clk_get_parent(hw->clk);
 399         struct clk *root = clk_get_parent(pll);
 400         unsigned long root_rate = clk_get_rate(root);
 401         unsigned long best_rate_error = rate;
 402         u16 pdiv_min;
 403         u16 pdiv_max;
 404         u16 pdiv_best;
 405         u16 pdiv_now;
 406 
 407         if (root_rate % rate == 0)
 408                 return root_rate; /* Don't need the PLL, use bypass */
 409 
 410         pdiv_min = (u16)max(1ul, DIV_ROUND_UP(CDCE925_PLL_FREQUENCY_MIN, rate));
 411         pdiv_max = (u16)min(127ul, CDCE925_PLL_FREQUENCY_MAX / rate);
 412 
 413         if (pdiv_min > pdiv_max)
 414                 return 0; /* No can do? */
 415 
 416         pdiv_best = pdiv_min;
 417         for (pdiv_now = pdiv_min; pdiv_now < pdiv_max; ++pdiv_now) {
 418                 unsigned long target_rate = rate * pdiv_now;
 419                 long pll_rate = clk_round_rate(pll, target_rate);
 420                 unsigned long actual_rate;
 421                 unsigned long rate_error;
 422 
 423                 if (pll_rate <= 0)
 424                         continue;
 425                 actual_rate = pll_rate / pdiv_now;
 426                 rate_error = abs((long)actual_rate - (long)rate);
 427                 if (rate_error < best_rate_error) {
 428                         pdiv_best = pdiv_now;
 429                         best_rate_error = rate_error;
 430                 }
 431                 /* TODO: Consider PLL frequency based on smaller n/m values
 432                  * and pick the better one if the error is equal */
 433         }
 434 
 435         return rate * pdiv_best;
 436 }
 437 
 438 static long cdce925_clk_round_rate(struct clk_hw *hw, unsigned long rate,
 439                 unsigned long *parent_rate)
 440 {
 441         unsigned long l_parent_rate = *parent_rate;
 442         u16 divider = cdce925_calc_divider(rate, l_parent_rate);
 443 
 444         if (l_parent_rate / divider != rate) {
 445                 l_parent_rate = cdce925_clk_best_parent_rate(hw, rate);
 446                 divider = cdce925_calc_divider(rate, l_parent_rate);
 447                 *parent_rate = l_parent_rate;
 448         }
 449 
 450         if (divider)
 451                 return (long)(l_parent_rate / divider);
 452         return 0;
 453 }
 454 
 455 static int cdce925_clk_set_rate(struct clk_hw *hw, unsigned long rate,
 456                 unsigned long parent_rate)
 457 {
 458         struct clk_cdce925_output *data = to_clk_cdce925_output(hw);
 459 
 460         data->pdiv = cdce925_calc_divider(rate, parent_rate);
 461 
 462         return 0;
 463 }
 464 
 465 static const struct clk_ops cdce925_clk_ops = {
 466         .prepare = cdce925_clk_prepare,
 467         .unprepare = cdce925_clk_unprepare,
 468         .recalc_rate = cdce925_clk_recalc_rate,
 469         .round_rate = cdce925_clk_round_rate,
 470         .set_rate = cdce925_clk_set_rate,
 471 };
 472 
 473 
 474 static u16 cdce925_y1_calc_divider(unsigned long rate,
 475                 unsigned long parent_rate)
 476 {
 477         unsigned long divider;
 478 
 479         if (!rate)
 480                 return 0;
 481         if (rate >= parent_rate)
 482                 return 1;
 483 
 484         divider = DIV_ROUND_CLOSEST(parent_rate, rate);
 485         if (divider > 0x3FF) /* Y1 has 10-bit divider */
 486                 divider = 0x3FF;
 487 
 488         return (u16)divider;
 489 }
 490 
 491 static long cdce925_clk_y1_round_rate(struct clk_hw *hw, unsigned long rate,
 492                 unsigned long *parent_rate)
 493 {
 494         unsigned long l_parent_rate = *parent_rate;
 495         u16 divider = cdce925_y1_calc_divider(rate, l_parent_rate);
 496 
 497         if (divider)
 498                 return (long)(l_parent_rate / divider);
 499         return 0;
 500 }
 501 
 502 static int cdce925_clk_y1_set_rate(struct clk_hw *hw, unsigned long rate,
 503                 unsigned long parent_rate)
 504 {
 505         struct clk_cdce925_output *data = to_clk_cdce925_output(hw);
 506 
 507         data->pdiv = cdce925_y1_calc_divider(rate, parent_rate);
 508 
 509         return 0;
 510 }
 511 
 512 static const struct clk_ops cdce925_clk_y1_ops = {
 513         .prepare = cdce925_clk_prepare,
 514         .unprepare = cdce925_clk_unprepare,
 515         .recalc_rate = cdce925_clk_recalc_rate,
 516         .round_rate = cdce925_clk_y1_round_rate,
 517         .set_rate = cdce925_clk_y1_set_rate,
 518 };
 519 
 520 #define CDCE925_I2C_COMMAND_BLOCK_TRANSFER      0x00
 521 #define CDCE925_I2C_COMMAND_BYTE_TRANSFER       0x80
 522 
 523 static int cdce925_regmap_i2c_write(
 524         void *context, const void *data, size_t count)
 525 {
 526         struct device *dev = context;
 527         struct i2c_client *i2c = to_i2c_client(dev);
 528         int ret;
 529         u8 reg_data[2];
 530 
 531         if (count != 2)
 532                 return -ENOTSUPP;
 533 
 534         /* First byte is command code */
 535         reg_data[0] = CDCE925_I2C_COMMAND_BYTE_TRANSFER | ((u8 *)data)[0];
 536         reg_data[1] = ((u8 *)data)[1];
 537 
 538         dev_dbg(&i2c->dev, "%s(%zu) %#x %#x\n", __func__, count,
 539                         reg_data[0], reg_data[1]);
 540 
 541         ret = i2c_master_send(i2c, reg_data, count);
 542         if (likely(ret == count))
 543                 return 0;
 544         else if (ret < 0)
 545                 return ret;
 546         else
 547                 return -EIO;
 548 }
 549 
 550 static int cdce925_regmap_i2c_read(void *context,
 551            const void *reg, size_t reg_size, void *val, size_t val_size)
 552 {
 553         struct device *dev = context;
 554         struct i2c_client *i2c = to_i2c_client(dev);
 555         struct i2c_msg xfer[2];
 556         int ret;
 557         u8 reg_data[2];
 558 
 559         if (reg_size != 1)
 560                 return -ENOTSUPP;
 561 
 562         xfer[0].addr = i2c->addr;
 563         xfer[0].flags = 0;
 564         xfer[0].buf = reg_data;
 565         if (val_size == 1) {
 566                 reg_data[0] =
 567                         CDCE925_I2C_COMMAND_BYTE_TRANSFER | ((u8 *)reg)[0];
 568                 xfer[0].len = 1;
 569         } else {
 570                 reg_data[0] =
 571                         CDCE925_I2C_COMMAND_BLOCK_TRANSFER | ((u8 *)reg)[0];
 572                 reg_data[1] = val_size;
 573                 xfer[0].len = 2;
 574         }
 575 
 576         xfer[1].addr = i2c->addr;
 577         xfer[1].flags = I2C_M_RD;
 578         xfer[1].len = val_size;
 579         xfer[1].buf = val;
 580 
 581         ret = i2c_transfer(i2c->adapter, xfer, 2);
 582         if (likely(ret == 2)) {
 583                 dev_dbg(&i2c->dev, "%s(%zu, %zu) %#x %#x\n", __func__,
 584                                 reg_size, val_size, reg_data[0], *((u8 *)val));
 585                 return 0;
 586         } else if (ret < 0)
 587                 return ret;
 588         else
 589                 return -EIO;
 590 }
 591 
 592 static struct clk_hw *
 593 of_clk_cdce925_get(struct of_phandle_args *clkspec, void *_data)
 594 {
 595         struct clk_cdce925_chip *data = _data;
 596         unsigned int idx = clkspec->args[0];
 597 
 598         if (idx >= ARRAY_SIZE(data->clk)) {
 599                 pr_err("%s: invalid index %u\n", __func__, idx);
 600                 return ERR_PTR(-EINVAL);
 601         }
 602 
 603         return &data->clk[idx].hw;
 604 }
 605 
 606 static void cdce925_regulator_disable(void *regulator)
 607 {
 608         regulator_disable(regulator);
 609 }
 610 
 611 static int cdce925_regulator_enable(struct device *dev, const char *name)
 612 {
 613         struct regulator *regulator;
 614         int err;
 615 
 616         regulator = devm_regulator_get(dev, name);
 617         if (IS_ERR(regulator))
 618                 return PTR_ERR(regulator);
 619 
 620         err = regulator_enable(regulator);
 621         if (err) {
 622                 dev_err(dev, "Failed to enable %s: %d\n", name, err);
 623                 return err;
 624         }
 625 
 626         return devm_add_action_or_reset(dev, cdce925_regulator_disable,
 627                                         regulator);
 628 }
 629 
 630 /* The CDCE925 uses a funky way to read/write registers. Bulk mode is
 631  * just weird, so just use the single byte mode exclusively. */
 632 static struct regmap_bus regmap_cdce925_bus = {
 633         .write = cdce925_regmap_i2c_write,
 634         .read = cdce925_regmap_i2c_read,
 635 };
 636 
 637 static int cdce925_probe(struct i2c_client *client,
 638                 const struct i2c_device_id *id)
 639 {
 640         struct clk_cdce925_chip *data;
 641         struct device_node *node = client->dev.of_node;
 642         const char *parent_name;
 643         const char *pll_clk_name[MAX_NUMBER_OF_PLLS] = {NULL,};
 644         struct clk_init_data init;
 645         u32 value;
 646         int i;
 647         int err;
 648         struct device_node *np_output;
 649         char child_name[6];
 650         struct regmap_config config = {
 651                 .name = "configuration0",
 652                 .reg_bits = 8,
 653                 .val_bits = 8,
 654                 .cache_type = REGCACHE_RBTREE,
 655         };
 656 
 657         dev_dbg(&client->dev, "%s\n", __func__);
 658 
 659         err = cdce925_regulator_enable(&client->dev, "vdd");
 660         if (err)
 661                 return err;
 662 
 663         err = cdce925_regulator_enable(&client->dev, "vddout");
 664         if (err)
 665                 return err;
 666 
 667         data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
 668         if (!data)
 669                 return -ENOMEM;
 670 
 671         data->i2c_client = client;
 672         data->chip_info = &clk_cdce925_chip_info_tbl[id->driver_data];
 673         config.max_register = CDCE925_OFFSET_PLL +
 674                 data->chip_info->num_plls * 0x10 - 1;
 675         data->regmap = devm_regmap_init(&client->dev, &regmap_cdce925_bus,
 676                         &client->dev, &config);
 677         if (IS_ERR(data->regmap)) {
 678                 dev_err(&client->dev, "failed to allocate register map\n");
 679                 return PTR_ERR(data->regmap);
 680         }
 681         i2c_set_clientdata(client, data);
 682 
 683         parent_name = of_clk_get_parent_name(node, 0);
 684         if (!parent_name) {
 685                 dev_err(&client->dev, "missing parent clock\n");
 686                 return -ENODEV;
 687         }
 688         dev_dbg(&client->dev, "parent is: %s\n", parent_name);
 689 
 690         if (of_property_read_u32(node, "xtal-load-pf", &value) == 0)
 691                 regmap_write(data->regmap,
 692                         CDCE925_REG_XCSEL, (value << 3) & 0xF8);
 693         /* PWDN bit */
 694         regmap_update_bits(data->regmap, CDCE925_REG_GLOBAL1, BIT(4), 0);
 695 
 696         /* Set input source for Y1 to be the XTAL */
 697         regmap_update_bits(data->regmap, 0x02, BIT(7), 0);
 698 
 699         init.ops = &cdce925_pll_ops;
 700         init.flags = 0;
 701         init.parent_names = &parent_name;
 702         init.num_parents = 1;
 703 
 704         /* Register PLL clocks */
 705         for (i = 0; i < data->chip_info->num_plls; ++i) {
 706                 pll_clk_name[i] = kasprintf(GFP_KERNEL, "%pOFn.pll%d",
 707                         client->dev.of_node, i);
 708                 init.name = pll_clk_name[i];
 709                 data->pll[i].chip = data;
 710                 data->pll[i].hw.init = &init;
 711                 data->pll[i].index = i;
 712                 err = devm_clk_hw_register(&client->dev, &data->pll[i].hw);
 713                 if (err) {
 714                         dev_err(&client->dev, "Failed register PLL %d\n", i);
 715                         goto error;
 716                 }
 717                 sprintf(child_name, "PLL%d", i+1);
 718                 np_output = of_get_child_by_name(node, child_name);
 719                 if (!np_output)
 720                         continue;
 721                 if (!of_property_read_u32(np_output,
 722                         "clock-frequency", &value)) {
 723                         err = clk_set_rate(data->pll[i].hw.clk, value);
 724                         if (err)
 725                                 dev_err(&client->dev,
 726                                         "unable to set PLL frequency %ud\n",
 727                                         value);
 728                 }
 729                 if (!of_property_read_u32(np_output,
 730                         "spread-spectrum", &value)) {
 731                         u8 flag = of_property_read_bool(np_output,
 732                                 "spread-spectrum-center") ? 0x80 : 0x00;
 733                         regmap_update_bits(data->regmap,
 734                                 0x16 + (i*CDCE925_OFFSET_PLL),
 735                                 0x80, flag);
 736                         regmap_update_bits(data->regmap,
 737                                 0x12 + (i*CDCE925_OFFSET_PLL),
 738                                 0x07, value & 0x07);
 739                 }
 740                 of_node_put(np_output);
 741         }
 742 
 743         /* Register output clock Y1 */
 744         init.ops = &cdce925_clk_y1_ops;
 745         init.flags = 0;
 746         init.num_parents = 1;
 747         init.parent_names = &parent_name; /* Mux Y1 to input */
 748         init.name = kasprintf(GFP_KERNEL, "%pOFn.Y1", client->dev.of_node);
 749         data->clk[0].chip = data;
 750         data->clk[0].hw.init = &init;
 751         data->clk[0].index = 0;
 752         data->clk[0].pdiv = 1;
 753         err = devm_clk_hw_register(&client->dev, &data->clk[0].hw);
 754         kfree(init.name); /* clock framework made a copy of the name */
 755         if (err) {
 756                 dev_err(&client->dev, "clock registration Y1 failed\n");
 757                 goto error;
 758         }
 759 
 760         /* Register output clocks Y2 .. Y5*/
 761         init.ops = &cdce925_clk_ops;
 762         init.flags = CLK_SET_RATE_PARENT;
 763         init.num_parents = 1;
 764         for (i = 1; i < data->chip_info->num_outputs; ++i) {
 765                 init.name = kasprintf(GFP_KERNEL, "%pOFn.Y%d",
 766                         client->dev.of_node, i+1);
 767                 data->clk[i].chip = data;
 768                 data->clk[i].hw.init = &init;
 769                 data->clk[i].index = i;
 770                 data->clk[i].pdiv = 1;
 771                 switch (i) {
 772                 case 1:
 773                 case 2:
 774                         /* Mux Y2/3 to PLL1 */
 775                         init.parent_names = &pll_clk_name[0];
 776                         break;
 777                 case 3:
 778                 case 4:
 779                         /* Mux Y4/5 to PLL2 */
 780                         init.parent_names = &pll_clk_name[1];
 781                         break;
 782                 case 5:
 783                 case 6:
 784                         /* Mux Y6/7 to PLL3 */
 785                         init.parent_names = &pll_clk_name[2];
 786                         break;
 787                 case 7:
 788                 case 8:
 789                         /* Mux Y8/9 to PLL4 */
 790                         init.parent_names = &pll_clk_name[3];
 791                         break;
 792                 }
 793                 err = devm_clk_hw_register(&client->dev, &data->clk[i].hw);
 794                 kfree(init.name); /* clock framework made a copy of the name */
 795                 if (err) {
 796                         dev_err(&client->dev, "clock registration failed\n");
 797                         goto error;
 798                 }
 799         }
 800 
 801         /* Register the output clocks */
 802         err = of_clk_add_hw_provider(client->dev.of_node, of_clk_cdce925_get,
 803                                   data);
 804         if (err)
 805                 dev_err(&client->dev, "unable to add OF clock provider\n");
 806 
 807         err = 0;
 808 
 809 error:
 810         for (i = 0; i < data->chip_info->num_plls; ++i)
 811                 /* clock framework made a copy of the name */
 812                 kfree(pll_clk_name[i]);
 813 
 814         return err;
 815 }
 816 
 817 static const struct i2c_device_id cdce925_id[] = {
 818         { "cdce913", CDCE913 },
 819         { "cdce925", CDCE925 },
 820         { "cdce937", CDCE937 },
 821         { "cdce949", CDCE949 },
 822         { }
 823 };
 824 MODULE_DEVICE_TABLE(i2c, cdce925_id);
 825 
 826 static const struct of_device_id clk_cdce925_of_match[] = {
 827         { .compatible = "ti,cdce913" },
 828         { .compatible = "ti,cdce925" },
 829         { .compatible = "ti,cdce937" },
 830         { .compatible = "ti,cdce949" },
 831         { },
 832 };
 833 MODULE_DEVICE_TABLE(of, clk_cdce925_of_match);
 834 
 835 static struct i2c_driver cdce925_driver = {
 836         .driver = {
 837                 .name = "cdce925",
 838                 .of_match_table = of_match_ptr(clk_cdce925_of_match),
 839         },
 840         .probe          = cdce925_probe,
 841         .id_table       = cdce925_id,
 842 };
 843 module_i2c_driver(cdce925_driver);
 844 
 845 MODULE_AUTHOR("Mike Looijmans <mike.looijmans@topic.nl>");
 846 MODULE_DESCRIPTION("TI CDCE913/925/937/949 driver");
 847 MODULE_LICENSE("GPL");