drivers/clk/clk-si5351.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * clk-si5351.c: Silicon Laboratories Si5351A/B/C I2C Clock Generator
   4  *
   5  * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
   6  * Rabeeh Khoury <rabeeh@solid-run.com>
   7  *
   8  * References:
   9  * [1] "Si5351A/B/C Data Sheet"
  10  *     https://www.silabs.com/Support%20Documents/TechnicalDocs/Si5351.pdf
  11  * [2] "Manually Generating an Si5351 Register Map"
  12  *     https://www.silabs.com/Support%20Documents/TechnicalDocs/AN619.pdf
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/clk.h>
  18 #include <linux/clk-provider.h>
  19 #include <linux/delay.h>
  20 #include <linux/err.h>
  21 #include <linux/errno.h>
  22 #include <linux/rational.h>
  23 #include <linux/i2c.h>
  24 #include <linux/of_platform.h>
  25 #include <linux/platform_data/si5351.h>
  26 #include <linux/regmap.h>
  27 #include <linux/slab.h>
  28 #include <linux/string.h>
  29 #include <asm/div64.h>
  30
  31 #include "clk-si5351.h"
  32
  33 struct si5351_driver_data;
  34
  35 struct si5351_parameters {
  36         unsigned long   p1;
  37         unsigned long   p2;
  38         unsigned long   p3;
  39         int             valid;
  40 };
  41
  42 struct si5351_hw_data {
  43         struct clk_hw                   hw;
  44         struct si5351_driver_data       *drvdata;
  45         struct si5351_parameters        params;
  46         unsigned char                   num;
  47 };
  48
  49 struct si5351_driver_data {
  50         enum si5351_variant     variant;
  51         struct i2c_client       *client;
  52         struct regmap           *regmap;
  53
  54         struct clk              *pxtal;
  55         const char              *pxtal_name;
  56         struct clk_hw           xtal;
  57         struct clk              *pclkin;
  58         const char              *pclkin_name;
  59         struct clk_hw           clkin;
  60
  61         struct si5351_hw_data   pll[2];
  62         struct si5351_hw_data   *msynth;
  63         struct si5351_hw_data   *clkout;
  64         size_t                  num_clkout;
  65 };
  66
  67 static const char * const si5351_input_names[] = {
  68         "xtal", "clkin"
  69 };
  70 static const char * const si5351_pll_names[] = {
  71         "si5351_plla", "si5351_pllb", "si5351_vxco"
  72 };
  73 static const char * const si5351_msynth_names[] = {
  74         "ms0", "ms1", "ms2", "ms3", "ms4", "ms5", "ms6", "ms7"
  75 };
  76 static const char * const si5351_clkout_names[] = {
  77         "clk0", "clk1", "clk2", "clk3", "clk4", "clk5", "clk6", "clk7"
  78 };
  79
  80 /*
  81  * Si5351 i2c regmap
  82  */
  83 static inline u8 si5351_reg_read(struct si5351_driver_data *drvdata, u8 reg)
  84 {
  85         u32 val;
  86         int ret;
  87
  88         ret = regmap_read(drvdata->regmap, reg, &val);
  89         if (ret) {
  90                 dev_err(&drvdata->client->dev,
  91                         "unable to read from reg%02x\n", reg);
  92                 return 0;
  93         }
  94
  95         return (u8)val;
  96 }
  97
  98 static inline int si5351_bulk_read(struct si5351_driver_data *drvdata,
  99                                    u8 reg, u8 count, u8 *buf)
 100 {
 101         return regmap_bulk_read(drvdata->regmap, reg, buf, count);
 102 }
 103
 104 static inline int si5351_reg_write(struct si5351_driver_data *drvdata,
 105                                    u8 reg, u8 val)
 106 {
 107         return regmap_write(drvdata->regmap, reg, val);
 108 }
 109
 110 static inline int si5351_bulk_write(struct si5351_driver_data *drvdata,
 111                                     u8 reg, u8 count, const u8 *buf)
 112 {
 113         return regmap_raw_write(drvdata->regmap, reg, buf, count);
 114 }
 115
 116 static inline int si5351_set_bits(struct si5351_driver_data *drvdata,
 117                                   u8 reg, u8 mask, u8 val)
 118 {
 119         return regmap_update_bits(drvdata->regmap, reg, mask, val);
 120 }
 121
 122 static inline u8 si5351_msynth_params_address(int num)
 123 {
 124         if (num > 5)
 125                 return SI5351_CLK6_PARAMETERS + (num - 6);
 126         return SI5351_CLK0_PARAMETERS + (SI5351_PARAMETERS_LENGTH * num);
 127 }
 128
 129 static void si5351_read_parameters(struct si5351_driver_data *drvdata,
 130                                    u8 reg, struct si5351_parameters *params)
 131 {
 132         u8 buf[SI5351_PARAMETERS_LENGTH];
 133
 134         switch (reg) {
 135         case SI5351_CLK6_PARAMETERS:
 136         case SI5351_CLK7_PARAMETERS:
 137                 buf[0] = si5351_reg_read(drvdata, reg);
 138                 params->p1 = buf[0];
 139                 params->p2 = 0;
 140                 params->p3 = 1;
 141                 break;
 142         default:
 143                 si5351_bulk_read(drvdata, reg, SI5351_PARAMETERS_LENGTH, buf);
 144                 params->p1 = ((buf[2] & 0x03) << 16) | (buf[3] << 8) | buf[4];
 145                 params->p2 = ((buf[5] & 0x0f) << 16) | (buf[6] << 8) | buf[7];
 146                 params->p3 = ((buf[5] & 0xf0) << 12) | (buf[0] << 8) | buf[1];
 147         }
 148         params->valid = 1;
 149 }
 150
 151 static void si5351_write_parameters(struct si5351_driver_data *drvdata,
 152                                     u8 reg, struct si5351_parameters *params)
 153 {
 154         u8 buf[SI5351_PARAMETERS_LENGTH];
 155
 156         switch (reg) {
 157         case SI5351_CLK6_PARAMETERS:
 158         case SI5351_CLK7_PARAMETERS:
 159                 buf[0] = params->p1 & 0xff;
 160                 si5351_reg_write(drvdata, reg, buf[0]);
 161                 break;
 162         default:
 163                 buf[0] = ((params->p3 & 0x0ff00) >> 8) & 0xff;
 164                 buf[1] = params->p3 & 0xff;
 165                 /* save rdiv and divby4 */
 166                 buf[2] = si5351_reg_read(drvdata, reg + 2) & ~0x03;
 167                 buf[2] |= ((params->p1 & 0x30000) >> 16) & 0x03;
 168                 buf[3] = ((params->p1 & 0x0ff00) >> 8) & 0xff;
 169                 buf[4] = params->p1 & 0xff;
 170                 buf[5] = ((params->p3 & 0xf0000) >> 12) |
 171                         ((params->p2 & 0xf0000) >> 16);
 172                 buf[6] = ((params->p2 & 0x0ff00) >> 8) & 0xff;
 173                 buf[7] = params->p2 & 0xff;
 174                 si5351_bulk_write(drvdata, reg, SI5351_PARAMETERS_LENGTH, buf);
 175         }
 176 }
 177
 178 static bool si5351_regmap_is_volatile(struct device *dev, unsigned int reg)
 179 {
 180         switch (reg) {
 181         case SI5351_DEVICE_STATUS:
 182         case SI5351_INTERRUPT_STATUS:
 183         case SI5351_PLL_RESET:
 184                 return true;
 185         }
 186         return false;
 187 }
 188
 189 static bool si5351_regmap_is_writeable(struct device *dev, unsigned int reg)
 190 {
 191         /* reserved registers */
 192         if (reg >= 4 && reg <= 8)
 193                 return false;
 194         if (reg >= 10 && reg <= 14)
 195                 return false;
 196         if (reg >= 173 && reg <= 176)
 197                 return false;
 198         if (reg >= 178 && reg <= 182)
 199                 return false;
 200         /* read-only */
 201         if (reg == SI5351_DEVICE_STATUS)
 202                 return false;
 203         return true;
 204 }
 205
 206 static const struct regmap_config si5351_regmap_config = {
 207         .reg_bits = 8,
 208         .val_bits = 8,
 209         .cache_type = REGCACHE_RBTREE,
 210         .max_register = 187,
 211         .writeable_reg = si5351_regmap_is_writeable,
 212         .volatile_reg = si5351_regmap_is_volatile,
 213 };
 214
 215 /*
 216  * Si5351 xtal clock input
 217  */
 218 static int si5351_xtal_prepare(struct clk_hw *hw)
 219 {
 220         struct si5351_driver_data *drvdata =
 221                 container_of(hw, struct si5351_driver_data, xtal);
 222         si5351_set_bits(drvdata, SI5351_FANOUT_ENABLE,
 223                         SI5351_XTAL_ENABLE, SI5351_XTAL_ENABLE);
 224         return 0;
 225 }
 226
 227 static void si5351_xtal_unprepare(struct clk_hw *hw)
 228 {
 229         struct si5351_driver_data *drvdata =
 230                 container_of(hw, struct si5351_driver_data, xtal);
 231         si5351_set_bits(drvdata, SI5351_FANOUT_ENABLE,
 232                         SI5351_XTAL_ENABLE, 0);
 233 }
 234
 235 static const struct clk_ops si5351_xtal_ops = {
 236         .prepare = si5351_xtal_prepare,
 237         .unprepare = si5351_xtal_unprepare,
 238 };
 239
 240 /*
 241  * Si5351 clkin clock input (Si5351C only)
 242  */
 243 static int si5351_clkin_prepare(struct clk_hw *hw)
 244 {
 245         struct si5351_driver_data *drvdata =
 246                 container_of(hw, struct si5351_driver_data, clkin);
 247         si5351_set_bits(drvdata, SI5351_FANOUT_ENABLE,
 248                         SI5351_CLKIN_ENABLE, SI5351_CLKIN_ENABLE);
 249         return 0;
 250 }
 251
 252 static void si5351_clkin_unprepare(struct clk_hw *hw)
 253 {
 254         struct si5351_driver_data *drvdata =
 255                 container_of(hw, struct si5351_driver_data, clkin);
 256         si5351_set_bits(drvdata, SI5351_FANOUT_ENABLE,
 257                         SI5351_CLKIN_ENABLE, 0);
 258 }
 259
 260 /*
 261  * CMOS clock source constraints:
 262  * The input frequency range of the PLL is 10Mhz to 40MHz.
 263  * If CLKIN is >40MHz, the input divider must be used.
 264  */
 265 static unsigned long si5351_clkin_recalc_rate(struct clk_hw *hw,
 266                                               unsigned long parent_rate)
 267 {
 268         struct si5351_driver_data *drvdata =
 269                 container_of(hw, struct si5351_driver_data, clkin);
 270         unsigned long rate;
 271         unsigned char idiv;
 272
 273         rate = parent_rate;
 274         if (parent_rate > 160000000) {
 275                 idiv = SI5351_CLKIN_DIV_8;
 276                 rate /= 8;
 277         } else if (parent_rate > 80000000) {
 278                 idiv = SI5351_CLKIN_DIV_4;
 279                 rate /= 4;
 280         } else if (parent_rate > 40000000) {
 281                 idiv = SI5351_CLKIN_DIV_2;
 282                 rate /= 2;
 283         } else {
 284                 idiv = SI5351_CLKIN_DIV_1;
 285         }
 286
 287         si5351_set_bits(drvdata, SI5351_PLL_INPUT_SOURCE,
 288                         SI5351_CLKIN_DIV_MASK, idiv);
 289
 290         dev_dbg(&drvdata->client->dev, "%s - clkin div = %d, rate = %lu\n",
 291                 __func__, (1 << (idiv >> 6)), rate);
 292
 293         return rate;
 294 }
 295
 296 static const struct clk_ops si5351_clkin_ops = {
 297         .prepare = si5351_clkin_prepare,
 298         .unprepare = si5351_clkin_unprepare,
 299         .recalc_rate = si5351_clkin_recalc_rate,
 300 };
 301
 302 /*
 303  * Si5351 vxco clock input (Si5351B only)
 304  */
 305
 306 static int si5351_vxco_prepare(struct clk_hw *hw)
 307 {
 308         struct si5351_hw_data *hwdata =
 309                 container_of(hw, struct si5351_hw_data, hw);
 310
 311         dev_warn(&hwdata->drvdata->client->dev, "VXCO currently unsupported\n");
 312
 313         return 0;
 314 }
 315
 316 static void si5351_vxco_unprepare(struct clk_hw *hw)
 317 {
 318 }
 319
 320 static unsigned long si5351_vxco_recalc_rate(struct clk_hw *hw,
 321                                              unsigned long parent_rate)
 322 {
 323         return 0;
 324 }
 325
 326 static int si5351_vxco_set_rate(struct clk_hw *hw, unsigned long rate,
 327                                 unsigned long parent)
 328 {
 329         return 0;
 330 }
 331
 332 static const struct clk_ops si5351_vxco_ops = {
 333         .prepare = si5351_vxco_prepare,
 334         .unprepare = si5351_vxco_unprepare,
 335         .recalc_rate = si5351_vxco_recalc_rate,
 336         .set_rate = si5351_vxco_set_rate,
 337 };
 338
 339 /*
 340  * Si5351 pll a/b
 341  *
 342  * Feedback Multisynth Divider Equations [2]
 343  *
 344  * fVCO = fIN * (a + b/c)
 345  *
 346  * with 15 + 0/1048575 <= (a + b/c) <= 90 + 0/1048575 and
 347  * fIN = fXTAL or fIN = fCLKIN/CLKIN_DIV
 348  *
 349  * Feedback Multisynth Register Equations
 350  *
 351  * (1) MSNx_P1[17:0] = 128 * a + floor(128 * b/c) - 512
 352  * (2) MSNx_P2[19:0] = 128 * b - c * floor(128 * b/c) = (128*b) mod c
 353  * (3) MSNx_P3[19:0] = c
 354  *
 355  * Transposing (2) yields: (4) floor(128 * b/c) = (128 * b / MSNx_P2)/c
 356  *
 357  * Using (4) on (1) yields:
 358  * MSNx_P1 = 128 * a + (128 * b/MSNx_P2)/c - 512
 359  * MSNx_P1 + 512 + MSNx_P2/c = 128 * a + 128 * b/c
 360  *
 361  * a + b/c = (MSNx_P1 + MSNx_P2/MSNx_P3 + 512)/128
 362  *         = (MSNx_P1*MSNx_P3 + MSNx_P2 + 512*MSNx_P3)/(128*MSNx_P3)
 363  *
 364  */
 365 static int _si5351_pll_reparent(struct si5351_driver_data *drvdata,
 366                                 int num, enum si5351_pll_src parent)
 367 {
 368         u8 mask = (num == 0) ? SI5351_PLLA_SOURCE : SI5351_PLLB_SOURCE;
 369
 370         if (parent == SI5351_PLL_SRC_DEFAULT)
 371                 return 0;
 372
 373         if (num > 2)
 374                 return -EINVAL;
 375
 376         if (drvdata->variant != SI5351_VARIANT_C &&
 377             parent != SI5351_PLL_SRC_XTAL)
 378                 return -EINVAL;
 379
 380         si5351_set_bits(drvdata, SI5351_PLL_INPUT_SOURCE, mask,
 381                         (parent == SI5351_PLL_SRC_XTAL) ? 0 : mask);
 382         return 0;
 383 }
 384
 385 static unsigned char si5351_pll_get_parent(struct clk_hw *hw)
 386 {
 387         struct si5351_hw_data *hwdata =
 388                 container_of(hw, struct si5351_hw_data, hw);
 389         u8 mask = (hwdata->num == 0) ? SI5351_PLLA_SOURCE : SI5351_PLLB_SOURCE;
 390         u8 val;
 391
 392         val = si5351_reg_read(hwdata->drvdata, SI5351_PLL_INPUT_SOURCE);
 393
 394         return (val & mask) ? 1 : 0;
 395 }
 396
 397 static int si5351_pll_set_parent(struct clk_hw *hw, u8 index)
 398 {
 399         struct si5351_hw_data *hwdata =
 400                 container_of(hw, struct si5351_hw_data, hw);
 401
 402         if (hwdata->drvdata->variant != SI5351_VARIANT_C &&
 403             index > 0)
 404                 return -EPERM;
 405
 406         if (index > 1)
 407                 return -EINVAL;
 408
 409         return _si5351_pll_reparent(hwdata->drvdata, hwdata->num,
 410                              (index == 0) ? SI5351_PLL_SRC_XTAL :
 411                              SI5351_PLL_SRC_CLKIN);
 412 }
 413
 414 static unsigned long si5351_pll_recalc_rate(struct clk_hw *hw,
 415                                             unsigned long parent_rate)
 416 {
 417         struct si5351_hw_data *hwdata =
 418                 container_of(hw, struct si5351_hw_data, hw);
 419         u8 reg = (hwdata->num == 0) ? SI5351_PLLA_PARAMETERS :
 420                 SI5351_PLLB_PARAMETERS;
 421         unsigned long long rate;
 422
 423         if (!hwdata->params.valid)
 424                 si5351_read_parameters(hwdata->drvdata, reg, &hwdata->params);
 425
 426         if (hwdata->params.p3 == 0)
 427                 return parent_rate;
 428
 429         /* fVCO = fIN * (P1*P3 + 512*P3 + P2)/(128*P3) */
 430         rate  = hwdata->params.p1 * hwdata->params.p3;
 431         rate += 512 * hwdata->params.p3;
 432         rate += hwdata->params.p2;
 433         rate *= parent_rate;
 434         do_div(rate, 128 * hwdata->params.p3);
 435
 436         dev_dbg(&hwdata->drvdata->client->dev,
 437                 "%s - %s: p1 = %lu, p2 = %lu, p3 = %lu, parent_rate = %lu, rate = %lu\n",
 438                 __func__, clk_hw_get_name(hw),
 439                 hwdata->params.p1, hwdata->params.p2, hwdata->params.p3,
 440                 parent_rate, (unsigned long)rate);
 441
 442         return (unsigned long)rate;
 443 }
 444
 445 static long si5351_pll_round_rate(struct clk_hw *hw, unsigned long rate,
 446                                   unsigned long *parent_rate)
 447 {
 448         struct si5351_hw_data *hwdata =
 449                 container_of(hw, struct si5351_hw_data, hw);
 450         unsigned long rfrac, denom, a, b, c;
 451         unsigned long long lltmp;
 452
 453         if (rate < SI5351_PLL_VCO_MIN)
 454                 rate = SI5351_PLL_VCO_MIN;
 455         if (rate > SI5351_PLL_VCO_MAX)
 456                 rate = SI5351_PLL_VCO_MAX;
 457
 458         /* determine integer part of feedback equation */
 459         a = rate / *parent_rate;
 460
 461         if (a < SI5351_PLL_A_MIN)
 462                 rate = *parent_rate * SI5351_PLL_A_MIN;
 463         if (a > SI5351_PLL_A_MAX)
 464                 rate = *parent_rate * SI5351_PLL_A_MAX;
 465
 466         /* find best approximation for b/c = fVCO mod fIN */
 467         denom = 1000 * 1000;
 468         lltmp = rate % (*parent_rate);
 469         lltmp *= denom;
 470         do_div(lltmp, *parent_rate);
 471         rfrac = (unsigned long)lltmp;
 472
 473         b = 0;
 474         c = 1;
 475         if (rfrac)
 476                 rational_best_approximation(rfrac, denom,
 477                                     SI5351_PLL_B_MAX, SI5351_PLL_C_MAX, &b, &c);
 478
 479         /* calculate parameters */
 480         hwdata->params.p3  = c;
 481         hwdata->params.p2  = (128 * b) % c;
 482         hwdata->params.p1  = 128 * a;
 483         hwdata->params.p1 += (128 * b / c);
 484         hwdata->params.p1 -= 512;
 485
 486         /* recalculate rate by fIN * (a + b/c) */
 487         lltmp  = *parent_rate;
 488         lltmp *= b;
 489         do_div(lltmp, c);
 490
 491         rate  = (unsigned long)lltmp;
 492         rate += *parent_rate * a;
 493
 494         dev_dbg(&hwdata->drvdata->client->dev,
 495                 "%s - %s: a = %lu, b = %lu, c = %lu, parent_rate = %lu, rate = %lu\n",
 496                 __func__, clk_hw_get_name(hw), a, b, c,
 497                 *parent_rate, rate);
 498
 499         return rate;
 500 }
 501
 502 static int si5351_pll_set_rate(struct clk_hw *hw, unsigned long rate,
 503                                unsigned long parent_rate)
 504 {
 505         struct si5351_hw_data *hwdata =
 506                 container_of(hw, struct si5351_hw_data, hw);
 507         u8 reg = (hwdata->num == 0) ? SI5351_PLLA_PARAMETERS :
 508                 SI5351_PLLB_PARAMETERS;
 509
 510         /* write multisynth parameters */
 511         si5351_write_parameters(hwdata->drvdata, reg, &hwdata->params);
 512
 513         /* plla/pllb ctrl is in clk6/clk7 ctrl registers */
 514         si5351_set_bits(hwdata->drvdata, SI5351_CLK6_CTRL + hwdata->num,
 515                 SI5351_CLK_INTEGER_MODE,
 516                 (hwdata->params.p2 == 0) ? SI5351_CLK_INTEGER_MODE : 0);
 517
 518         /* Do a pll soft reset on the affected pll */
 519         si5351_reg_write(hwdata->drvdata, SI5351_PLL_RESET,
 520                          hwdata->num == 0 ? SI5351_PLL_RESET_A :
 521                                             SI5351_PLL_RESET_B);
 522
 523         dev_dbg(&hwdata->drvdata->client->dev,
 524                 "%s - %s: p1 = %lu, p2 = %lu, p3 = %lu, parent_rate = %lu, rate = %lu\n",
 525                 __func__, clk_hw_get_name(hw),
 526                 hwdata->params.p1, hwdata->params.p2, hwdata->params.p3,
 527                 parent_rate, rate);
 528
 529         return 0;
 530 }
 531
 532 static const struct clk_ops si5351_pll_ops = {
 533         .set_parent = si5351_pll_set_parent,
 534         .get_parent = si5351_pll_get_parent,
 535         .recalc_rate = si5351_pll_recalc_rate,
 536         .round_rate = si5351_pll_round_rate,
 537         .set_rate = si5351_pll_set_rate,
 538 };
 539
 540 /*
 541  * Si5351 multisync divider
 542  *
 543  * for fOUT <= 150 MHz:
 544  *
 545  * fOUT = (fIN * (a + b/c)) / CLKOUTDIV
 546  *
 547  * with 6 + 0/1048575 <= (a + b/c) <= 1800 + 0/1048575 and
 548  * fIN = fVCO0, fVCO1
 549  *
 550  * Output Clock Multisynth Register Equations
 551  *
 552  * MSx_P1[17:0] = 128 * a + floor(128 * b/c) - 512
 553  * MSx_P2[19:0] = 128 * b - c * floor(128 * b/c) = (128*b) mod c
 554  * MSx_P3[19:0] = c
 555  *
 556  * MS[6,7] are integer (P1) divide only, P1 = divide value,
 557  * P2 and P3 are not applicable
 558  *
 559  * for 150MHz < fOUT <= 160MHz:
 560  *
 561  * MSx_P1 = 0, MSx_P2 = 0, MSx_P3 = 1, MSx_INT = 1, MSx_DIVBY4 = 11b
 562  */
 563 static int _si5351_msynth_reparent(struct si5351_driver_data *drvdata,
 564                                    int num, enum si5351_multisynth_src parent)
 565 {
 566         if (parent == SI5351_MULTISYNTH_SRC_DEFAULT)
 567                 return 0;
 568
 569         if (num > 8)
 570                 return -EINVAL;
 571
 572         si5351_set_bits(drvdata, SI5351_CLK0_CTRL + num, SI5351_CLK_PLL_SELECT,
 573                         (parent == SI5351_MULTISYNTH_SRC_VCO0) ? 0 :
 574                         SI5351_CLK_PLL_SELECT);
 575         return 0;
 576 }
 577
 578 static unsigned char si5351_msynth_get_parent(struct clk_hw *hw)
 579 {
 580         struct si5351_hw_data *hwdata =
 581                 container_of(hw, struct si5351_hw_data, hw);
 582         u8 val;
 583
 584         val = si5351_reg_read(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num);
 585
 586         return (val & SI5351_CLK_PLL_SELECT) ? 1 : 0;
 587 }
 588
 589 static int si5351_msynth_set_parent(struct clk_hw *hw, u8 index)
 590 {
 591         struct si5351_hw_data *hwdata =
 592                 container_of(hw, struct si5351_hw_data, hw);
 593
 594         return _si5351_msynth_reparent(hwdata->drvdata, hwdata->num,
 595                                (index == 0) ? SI5351_MULTISYNTH_SRC_VCO0 :
 596                                SI5351_MULTISYNTH_SRC_VCO1);
 597 }
 598
 599 static unsigned long si5351_msynth_recalc_rate(struct clk_hw *hw,
 600                                                unsigned long parent_rate)
 601 {
 602         struct si5351_hw_data *hwdata =
 603                 container_of(hw, struct si5351_hw_data, hw);
 604         u8 reg = si5351_msynth_params_address(hwdata->num);
 605         unsigned long long rate;
 606         unsigned long m;
 607
 608         if (!hwdata->params.valid)
 609                 si5351_read_parameters(hwdata->drvdata, reg, &hwdata->params);
 610
 611         /*
 612          * multisync0-5: fOUT = (128 * P3 * fIN) / (P1*P3 + P2 + 512*P3)
 613          * multisync6-7: fOUT = fIN / P1
 614          */
 615         rate = parent_rate;
 616         if (hwdata->num > 5) {
 617                 m = hwdata->params.p1;
 618         } else if (hwdata->params.p3 == 0) {
 619                 return parent_rate;
 620         } else if ((si5351_reg_read(hwdata->drvdata, reg + 2) &
 621                     SI5351_OUTPUT_CLK_DIVBY4) == SI5351_OUTPUT_CLK_DIVBY4) {
 622                 m = 4;
 623         } else {
 624                 rate *= 128 * hwdata->params.p3;
 625                 m = hwdata->params.p1 * hwdata->params.p3;
 626                 m += hwdata->params.p2;
 627                 m += 512 * hwdata->params.p3;
 628         }
 629
 630         if (m == 0)
 631                 return 0;
 632         do_div(rate, m);
 633
 634         dev_dbg(&hwdata->drvdata->client->dev,
 635                 "%s - %s: p1 = %lu, p2 = %lu, p3 = %lu, m = %lu, parent_rate = %lu, rate = %lu\n",
 636                 __func__, clk_hw_get_name(hw),
 637                 hwdata->params.p1, hwdata->params.p2, hwdata->params.p3,
 638                 m, parent_rate, (unsigned long)rate);
 639
 640         return (unsigned long)rate;
 641 }
 642
 643 static long si5351_msynth_round_rate(struct clk_hw *hw, unsigned long rate,
 644                                      unsigned long *parent_rate)
 645 {
 646         struct si5351_hw_data *hwdata =
 647                 container_of(hw, struct si5351_hw_data, hw);
 648         unsigned long long lltmp;
 649         unsigned long a, b, c;
 650         int divby4;
 651
 652         /* multisync6-7 can only handle freqencies < 150MHz */
 653         if (hwdata->num >= 6 && rate > SI5351_MULTISYNTH67_MAX_FREQ)
 654                 rate = SI5351_MULTISYNTH67_MAX_FREQ;
 655
 656         /* multisync frequency is 1MHz .. 160MHz */
 657         if (rate > SI5351_MULTISYNTH_MAX_FREQ)
 658                 rate = SI5351_MULTISYNTH_MAX_FREQ;
 659         if (rate < SI5351_MULTISYNTH_MIN_FREQ)
 660                 rate = SI5351_MULTISYNTH_MIN_FREQ;
 661
 662         divby4 = 0;
 663         if (rate > SI5351_MULTISYNTH_DIVBY4_FREQ)
 664                 divby4 = 1;
 665
 666         /* multisync can set pll */
 667         if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) {
 668                 /*
 669                  * find largest integer divider for max
 670                  * vco frequency and given target rate
 671                  */
 672                 if (divby4 == 0) {
 673                         lltmp = SI5351_PLL_VCO_MAX;
 674                         do_div(lltmp, rate);
 675                         a = (unsigned long)lltmp;
 676                 } else
 677                         a = 4;
 678
 679                 b = 0;
 680                 c = 1;
 681
 682                 *parent_rate = a * rate;
 683         } else if (hwdata->num >= 6) {
 684                 /* determine the closest integer divider */
 685                 a = DIV_ROUND_CLOSEST(*parent_rate, rate);
 686                 if (a < SI5351_MULTISYNTH_A_MIN)
 687                         a = SI5351_MULTISYNTH_A_MIN;
 688                 if (a > SI5351_MULTISYNTH67_A_MAX)
 689                         a = SI5351_MULTISYNTH67_A_MAX;
 690
 691                 b = 0;
 692                 c = 1;
 693         } else {
 694                 unsigned long rfrac, denom;
 695
 696                 /* disable divby4 */
 697                 if (divby4) {
 698                         rate = SI5351_MULTISYNTH_DIVBY4_FREQ;
 699                         divby4 = 0;
 700                 }
 701
 702                 /* determine integer part of divider equation */
 703                 a = *parent_rate / rate;
 704                 if (a < SI5351_MULTISYNTH_A_MIN)
 705                         a = SI5351_MULTISYNTH_A_MIN;
 706                 if (a > SI5351_MULTISYNTH_A_MAX)
 707                         a = SI5351_MULTISYNTH_A_MAX;
 708
 709                 /* find best approximation for b/c = fVCO mod fOUT */
 710                 denom = 1000 * 1000;
 711                 lltmp = (*parent_rate) % rate;
 712                 lltmp *= denom;
 713                 do_div(lltmp, rate);
 714                 rfrac = (unsigned long)lltmp;
 715
 716                 b = 0;
 717                 c = 1;
 718                 if (rfrac)
 719                         rational_best_approximation(rfrac, denom,
 720                             SI5351_MULTISYNTH_B_MAX, SI5351_MULTISYNTH_C_MAX,
 721                             &b, &c);
 722         }
 723
 724         /* recalculate rate by fOUT = fIN / (a + b/c) */
 725         lltmp  = *parent_rate;
 726         lltmp *= c;
 727         do_div(lltmp, a * c + b);
 728         rate  = (unsigned long)lltmp;
 729
 730         /* calculate parameters */
 731         if (divby4) {
 732                 hwdata->params.p3 = 1;
 733                 hwdata->params.p2 = 0;
 734                 hwdata->params.p1 = 0;
 735         } else if (hwdata->num >= 6) {
 736                 hwdata->params.p3 = 0;
 737                 hwdata->params.p2 = 0;
 738                 hwdata->params.p1 = a;
 739         } else {
 740                 hwdata->params.p3  = c;
 741                 hwdata->params.p2  = (128 * b) % c;
 742                 hwdata->params.p1  = 128 * a;
 743                 hwdata->params.p1 += (128 * b / c);
 744                 hwdata->params.p1 -= 512;
 745         }
 746
 747         dev_dbg(&hwdata->drvdata->client->dev,
 748                 "%s - %s: a = %lu, b = %lu, c = %lu, divby4 = %d, parent_rate = %lu, rate = %lu\n",
 749                 __func__, clk_hw_get_name(hw), a, b, c, divby4,
 750                 *parent_rate, rate);
 751
 752         return rate;
 753 }
 754
 755 static int si5351_msynth_set_rate(struct clk_hw *hw, unsigned long rate,
 756                                   unsigned long parent_rate)
 757 {
 758         struct si5351_hw_data *hwdata =
 759                 container_of(hw, struct si5351_hw_data, hw);
 760         u8 reg = si5351_msynth_params_address(hwdata->num);
 761         int divby4 = 0;
 762
 763         /* write multisynth parameters */
 764         si5351_write_parameters(hwdata->drvdata, reg, &hwdata->params);
 765
 766         if (rate > SI5351_MULTISYNTH_DIVBY4_FREQ)
 767                 divby4 = 1;
 768
 769         /* enable/disable integer mode and divby4 on multisynth0-5 */
 770         if (hwdata->num < 6) {
 771                 si5351_set_bits(hwdata->drvdata, reg + 2,
 772                                 SI5351_OUTPUT_CLK_DIVBY4,
 773                                 (divby4) ? SI5351_OUTPUT_CLK_DIVBY4 : 0);
 774                 si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num,
 775                         SI5351_CLK_INTEGER_MODE,
 776                         (hwdata->params.p2 == 0) ? SI5351_CLK_INTEGER_MODE : 0);
 777         }
 778
 779         dev_dbg(&hwdata->drvdata->client->dev,
 780                 "%s - %s: p1 = %lu, p2 = %lu, p3 = %lu, divby4 = %d, parent_rate = %lu, rate = %lu\n",
 781                 __func__, clk_hw_get_name(hw),
 782                 hwdata->params.p1, hwdata->params.p2, hwdata->params.p3,
 783                 divby4, parent_rate, rate);
 784
 785         return 0;
 786 }
 787
 788 static const struct clk_ops si5351_msynth_ops = {
 789         .set_parent = si5351_msynth_set_parent,
 790         .get_parent = si5351_msynth_get_parent,
 791         .recalc_rate = si5351_msynth_recalc_rate,
 792         .round_rate = si5351_msynth_round_rate,
 793         .set_rate = si5351_msynth_set_rate,
 794 };
 795
 796 /*
 797  * Si5351 clkout divider
 798  */
 799 static int _si5351_clkout_reparent(struct si5351_driver_data *drvdata,
 800                                    int num, enum si5351_clkout_src parent)
 801 {
 802         u8 val;
 803
 804         if (num > 8)
 805                 return -EINVAL;
 806
 807         switch (parent) {
 808         case SI5351_CLKOUT_SRC_MSYNTH_N:
 809                 val = SI5351_CLK_INPUT_MULTISYNTH_N;
 810                 break;
 811         case SI5351_CLKOUT_SRC_MSYNTH_0_4:
 812                 /* clk0/clk4 can only connect to its own multisync */
 813                 if (num == 0 || num == 4)
 814                         val = SI5351_CLK_INPUT_MULTISYNTH_N;
 815                 else
 816                         val = SI5351_CLK_INPUT_MULTISYNTH_0_4;
 817                 break;
 818         case SI5351_CLKOUT_SRC_XTAL:
 819                 val = SI5351_CLK_INPUT_XTAL;
 820                 break;
 821         case SI5351_CLKOUT_SRC_CLKIN:
 822                 if (drvdata->variant != SI5351_VARIANT_C)
 823                         return -EINVAL;
 824
 825                 val = SI5351_CLK_INPUT_CLKIN;
 826                 break;
 827         default:
 828                 return 0;
 829         }
 830
 831         si5351_set_bits(drvdata, SI5351_CLK0_CTRL + num,
 832                         SI5351_CLK_INPUT_MASK, val);
 833         return 0;
 834 }
 835
 836 static int _si5351_clkout_set_drive_strength(
 837         struct si5351_driver_data *drvdata, int num,
 838         enum si5351_drive_strength drive)
 839 {
 840         u8 mask;
 841
 842         if (num > 8)
 843                 return -EINVAL;
 844
 845         switch (drive) {
 846         case SI5351_DRIVE_2MA:
 847                 mask = SI5351_CLK_DRIVE_STRENGTH_2MA;
 848                 break;
 849         case SI5351_DRIVE_4MA:
 850                 mask = SI5351_CLK_DRIVE_STRENGTH_4MA;
 851                 break;
 852         case SI5351_DRIVE_6MA:
 853                 mask = SI5351_CLK_DRIVE_STRENGTH_6MA;
 854                 break;
 855         case SI5351_DRIVE_8MA:
 856                 mask = SI5351_CLK_DRIVE_STRENGTH_8MA;
 857                 break;
 858         default:
 859                 return 0;
 860         }
 861
 862         si5351_set_bits(drvdata, SI5351_CLK0_CTRL + num,
 863                         SI5351_CLK_DRIVE_STRENGTH_MASK, mask);
 864         return 0;
 865 }
 866
 867 static int _si5351_clkout_set_disable_state(
 868         struct si5351_driver_data *drvdata, int num,
 869         enum si5351_disable_state state)
 870 {
 871         u8 reg = (num < 4) ? SI5351_CLK3_0_DISABLE_STATE :
 872                 SI5351_CLK7_4_DISABLE_STATE;
 873         u8 shift = (num < 4) ? (2 * num) : (2 * (num-4));
 874         u8 mask = SI5351_CLK_DISABLE_STATE_MASK << shift;
 875         u8 val;
 876
 877         if (num > 8)
 878                 return -EINVAL;
 879
 880         switch (state) {
 881         case SI5351_DISABLE_LOW:
 882                 val = SI5351_CLK_DISABLE_STATE_LOW;
 883                 break;
 884         case SI5351_DISABLE_HIGH:
 885                 val = SI5351_CLK_DISABLE_STATE_HIGH;
 886                 break;
 887         case SI5351_DISABLE_FLOATING:
 888                 val = SI5351_CLK_DISABLE_STATE_FLOAT;
 889                 break;
 890         case SI5351_DISABLE_NEVER:
 891                 val = SI5351_CLK_DISABLE_STATE_NEVER;
 892                 break;
 893         default:
 894                 return 0;
 895         }
 896
 897         si5351_set_bits(drvdata, reg, mask, val << shift);
 898
 899         return 0;
 900 }
 901
 902 static void _si5351_clkout_reset_pll(struct si5351_driver_data *drvdata, int num)
 903 {
 904         u8 val = si5351_reg_read(drvdata, SI5351_CLK0_CTRL + num);
 905         u8 mask = val & SI5351_CLK_PLL_SELECT ? SI5351_PLL_RESET_B :
 906                                                        SI5351_PLL_RESET_A;
 907         unsigned int v;
 908         int err;
 909
 910         switch (val & SI5351_CLK_INPUT_MASK) {
 911         case SI5351_CLK_INPUT_XTAL:
 912         case SI5351_CLK_INPUT_CLKIN:
 913                 return;  /* pll not used, no need to reset */
 914         }
 915
 916         si5351_reg_write(drvdata, SI5351_PLL_RESET, mask);
 917
 918         err = regmap_read_poll_timeout(drvdata->regmap, SI5351_PLL_RESET, v,
 919                                  !(v & mask), 0, 20000);
 920         if (err < 0)
 921                 dev_err(&drvdata->client->dev, "Reset bit didn't clear\n");
 922
 923         dev_dbg(&drvdata->client->dev, "%s - %s: pll = %d\n",
 924                 __func__, clk_hw_get_name(&drvdata->clkout[num].hw),
 925                 (val & SI5351_CLK_PLL_SELECT) ? 1 : 0);
 926 }
 927
 928 static int si5351_clkout_prepare(struct clk_hw *hw)
 929 {
 930         struct si5351_hw_data *hwdata =
 931                 container_of(hw, struct si5351_hw_data, hw);
 932         struct si5351_platform_data *pdata =
 933                 hwdata->drvdata->client->dev.platform_data;
 934
 935         si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num,
 936                         SI5351_CLK_POWERDOWN, 0);
 937
 938         /*
 939          * Do a pll soft reset on the parent pll -- needed to get a
 940          * deterministic phase relationship between the output clocks.
 941          */
 942         if (pdata->clkout[hwdata->num].pll_reset)
 943                 _si5351_clkout_reset_pll(hwdata->drvdata, hwdata->num);
 944
 945         si5351_set_bits(hwdata->drvdata, SI5351_OUTPUT_ENABLE_CTRL,
 946                         (1 << hwdata->num), 0);
 947         return 0;
 948 }
 949
 950 static void si5351_clkout_unprepare(struct clk_hw *hw)
 951 {
 952         struct si5351_hw_data *hwdata =
 953                 container_of(hw, struct si5351_hw_data, hw);
 954
 955         si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num,
 956                         SI5351_CLK_POWERDOWN, SI5351_CLK_POWERDOWN);
 957         si5351_set_bits(hwdata->drvdata, SI5351_OUTPUT_ENABLE_CTRL,
 958                         (1 << hwdata->num), (1 << hwdata->num));
 959 }
 960
 961 static u8 si5351_clkout_get_parent(struct clk_hw *hw)
 962 {
 963         struct si5351_hw_data *hwdata =
 964                 container_of(hw, struct si5351_hw_data, hw);
 965         int index = 0;
 966         unsigned char val;
 967
 968         val = si5351_reg_read(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num);
 969         switch (val & SI5351_CLK_INPUT_MASK) {
 970         case SI5351_CLK_INPUT_MULTISYNTH_N:
 971                 index = 0;
 972                 break;
 973         case SI5351_CLK_INPUT_MULTISYNTH_0_4:
 974                 index = 1;
 975                 break;
 976         case SI5351_CLK_INPUT_XTAL:
 977                 index = 2;
 978                 break;
 979         case SI5351_CLK_INPUT_CLKIN:
 980                 index = 3;
 981                 break;
 982         }
 983
 984         return index;
 985 }
 986
 987 static int si5351_clkout_set_parent(struct clk_hw *hw, u8 index)
 988 {
 989         struct si5351_hw_data *hwdata =
 990                 container_of(hw, struct si5351_hw_data, hw);
 991         enum si5351_clkout_src parent = SI5351_CLKOUT_SRC_DEFAULT;
 992
 993         switch (index) {
 994         case 0:
 995                 parent = SI5351_CLKOUT_SRC_MSYNTH_N;
 996                 break;
 997         case 1:
 998                 parent = SI5351_CLKOUT_SRC_MSYNTH_0_4;
 999                 break;
1000         case 2:
1001                 parent = SI5351_CLKOUT_SRC_XTAL;
1002                 break;
1003         case 3:
1004                 parent = SI5351_CLKOUT_SRC_CLKIN;
1005                 break;
1006         }
1007
1008         return _si5351_clkout_reparent(hwdata->drvdata, hwdata->num, parent);
1009 }
1010
1011 static unsigned long si5351_clkout_recalc_rate(struct clk_hw *hw,
1012                                                unsigned long parent_rate)
1013 {
1014         struct si5351_hw_data *hwdata =
1015                 container_of(hw, struct si5351_hw_data, hw);
1016         unsigned char reg;
1017         unsigned char rdiv;
1018
1019         if (hwdata->num <= 5)
1020                 reg = si5351_msynth_params_address(hwdata->num) + 2;
1021         else
1022                 reg = SI5351_CLK6_7_OUTPUT_DIVIDER;
1023
1024         rdiv = si5351_reg_read(hwdata->drvdata, reg);
1025         if (hwdata->num == 6) {
1026                 rdiv &= SI5351_OUTPUT_CLK6_DIV_MASK;
1027         } else {
1028                 rdiv &= SI5351_OUTPUT_CLK_DIV_MASK;
1029                 rdiv >>= SI5351_OUTPUT_CLK_DIV_SHIFT;
1030         }
1031
1032         return parent_rate >> rdiv;
1033 }
1034
1035 static long si5351_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
1036                                      unsigned long *parent_rate)
1037 {
1038         struct si5351_hw_data *hwdata =
1039                 container_of(hw, struct si5351_hw_data, hw);
1040         unsigned char rdiv;
1041
1042         /* clkout6/7 can only handle output freqencies < 150MHz */
1043         if (hwdata->num >= 6 && rate > SI5351_CLKOUT67_MAX_FREQ)
1044                 rate = SI5351_CLKOUT67_MAX_FREQ;
1045
1046         /* clkout freqency is 8kHz - 160MHz */
1047         if (rate > SI5351_CLKOUT_MAX_FREQ)
1048                 rate = SI5351_CLKOUT_MAX_FREQ;
1049         if (rate < SI5351_CLKOUT_MIN_FREQ)
1050                 rate = SI5351_CLKOUT_MIN_FREQ;
1051
1052         /* request frequency if multisync master */
1053         if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) {
1054                 /* use r divider for frequencies below 1MHz */
1055                 rdiv = SI5351_OUTPUT_CLK_DIV_1;
1056                 while (rate < SI5351_MULTISYNTH_MIN_FREQ &&
1057                        rdiv < SI5351_OUTPUT_CLK_DIV_128) {
1058                         rdiv += 1;
1059                         rate *= 2;
1060                 }
1061                 *parent_rate = rate;
1062         } else {
1063                 unsigned long new_rate, new_err, err;
1064
1065                 /* round to closed rdiv */
1066                 rdiv = SI5351_OUTPUT_CLK_DIV_1;
1067                 new_rate = *parent_rate;
1068                 err = abs(new_rate - rate);
1069                 do {
1070                         new_rate >>= 1;
1071                         new_err = abs(new_rate - rate);
1072                         if (new_err > err || rdiv == SI5351_OUTPUT_CLK_DIV_128)
1073                                 break;
1074                         rdiv++;
1075                         err = new_err;
1076                 } while (1);
1077         }
1078         rate = *parent_rate >> rdiv;
1079
1080         dev_dbg(&hwdata->drvdata->client->dev,
1081                 "%s - %s: rdiv = %u, parent_rate = %lu, rate = %lu\n",
1082                 __func__, clk_hw_get_name(hw), (1 << rdiv),
1083                 *parent_rate, rate);
1084
1085         return rate;
1086 }
1087
1088 static int si5351_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
1089                                   unsigned long parent_rate)
1090 {
1091         struct si5351_hw_data *hwdata =
1092                 container_of(hw, struct si5351_hw_data, hw);
1093         unsigned long new_rate, new_err, err;
1094         unsigned char rdiv;
1095
1096         /* round to closed rdiv */
1097         rdiv = SI5351_OUTPUT_CLK_DIV_1;
1098         new_rate = parent_rate;
1099         err = abs(new_rate - rate);
1100         do {
1101                 new_rate >>= 1;
1102                 new_err = abs(new_rate - rate);
1103                 if (new_err > err || rdiv == SI5351_OUTPUT_CLK_DIV_128)
1104                         break;
1105                 rdiv++;
1106                 err = new_err;
1107         } while (1);
1108
1109         /* write output divider */
1110         switch (hwdata->num) {
1111         case 6:
1112                 si5351_set_bits(hwdata->drvdata, SI5351_CLK6_7_OUTPUT_DIVIDER,
1113                                 SI5351_OUTPUT_CLK6_DIV_MASK, rdiv);
1114                 break;
1115         case 7:
1116                 si5351_set_bits(hwdata->drvdata, SI5351_CLK6_7_OUTPUT_DIVIDER,
1117                                 SI5351_OUTPUT_CLK_DIV_MASK,
1118                                 rdiv << SI5351_OUTPUT_CLK_DIV_SHIFT);
1119                 break;
1120         default:
1121                 si5351_set_bits(hwdata->drvdata,
1122                                 si5351_msynth_params_address(hwdata->num) + 2,
1123                                 SI5351_OUTPUT_CLK_DIV_MASK,
1124                                 rdiv << SI5351_OUTPUT_CLK_DIV_SHIFT);
1125         }
1126
1127         /* powerup clkout */
1128         si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num,
1129                         SI5351_CLK_POWERDOWN, 0);
1130
1131         dev_dbg(&hwdata->drvdata->client->dev,
1132                 "%s - %s: rdiv = %u, parent_rate = %lu, rate = %lu\n",
1133                 __func__, clk_hw_get_name(hw), (1 << rdiv),
1134                 parent_rate, rate);
1135
1136         return 0;
1137 }
1138
1139 static const struct clk_ops si5351_clkout_ops = {
1140         .prepare = si5351_clkout_prepare,
1141         .unprepare = si5351_clkout_unprepare,
1142         .set_parent = si5351_clkout_set_parent,
1143         .get_parent = si5351_clkout_get_parent,
1144         .recalc_rate = si5351_clkout_recalc_rate,
1145         .round_rate = si5351_clkout_round_rate,
1146         .set_rate = si5351_clkout_set_rate,
1147 };
1148
1149 /*
1150  * Si5351 i2c probe and DT
1151  */
1152 #ifdef CONFIG_OF
1153 static const struct of_device_id si5351_dt_ids[] = {
1154         { .compatible = "silabs,si5351a", .data = (void *)SI5351_VARIANT_A, },
1155         { .compatible = "silabs,si5351a-msop",
1156                                          .data = (void *)SI5351_VARIANT_A3, },
1157         { .compatible = "silabs,si5351b", .data = (void *)SI5351_VARIANT_B, },
1158         { .compatible = "silabs,si5351c", .data = (void *)SI5351_VARIANT_C, },
1159         { }
1160 };
1161 MODULE_DEVICE_TABLE(of, si5351_dt_ids);
1162
1163 static int si5351_dt_parse(struct i2c_client *client,
1164                            enum si5351_variant variant)
1165 {
1166         struct device_node *child, *np = client->dev.of_node;
1167         struct si5351_platform_data *pdata;
1168         struct property *prop;
1169         const __be32 *p;
1170         int num = 0;
1171         u32 val;
1172
1173         if (np == NULL)
1174                 return 0;
1175
1176         pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
1177         if (!pdata)
1178                 return -ENOMEM;
1179
1180         /*
1181          * property silabs,pll-source : <num src>, [<..>]
1182          * allow to selectively set pll source
1183          */
1184         of_property_for_each_u32(np, "silabs,pll-source", prop, p, num) {
1185                 if (num >= 2) {
1186                         dev_err(&client->dev,
1187                                 "invalid pll %d on pll-source prop\n", num);
1188                         return -EINVAL;
1189                 }
1190
1191                 p = of_prop_next_u32(prop, p, &val);
1192                 if (!p) {
1193                         dev_err(&client->dev,
1194                                 "missing pll-source for pll %d\n", num);
1195                         return -EINVAL;
1196                 }
1197
1198                 switch (val) {
1199                 case 0:
1200                         pdata->pll_src[num] = SI5351_PLL_SRC_XTAL;
1201                         break;
1202                 case 1:
1203                         if (variant != SI5351_VARIANT_C) {
1204                                 dev_err(&client->dev,
1205                                         "invalid parent %d for pll %d\n",
1206                                         val, num);
1207                                 return -EINVAL;
1208                         }
1209                         pdata->pll_src[num] = SI5351_PLL_SRC_CLKIN;
1210                         break;
1211                 default:
1212                         dev_err(&client->dev,
1213                                  "invalid parent %d for pll %d\n", val, num);
1214                         return -EINVAL;
1215                 }
1216         }
1217
1218         /* per clkout properties */
1219         for_each_child_of_node(np, child) {
1220                 if (of_property_read_u32(child, "reg", &num)) {
1221                         dev_err(&client->dev, "missing reg property of %pOFn\n",
1222                                 child);
1223                         goto put_child;
1224                 }
1225
1226                 if (num >= 8 ||
1227                     (variant == SI5351_VARIANT_A3 && num >= 3)) {
1228                         dev_err(&client->dev, "invalid clkout %d\n", num);
1229                         goto put_child;
1230                 }
1231
1232                 if (!of_property_read_u32(child, "silabs,multisynth-source",
1233                                           &val)) {
1234                         switch (val) {
1235                         case 0:
1236                                 pdata->clkout[num].multisynth_src =
1237                                         SI5351_MULTISYNTH_SRC_VCO0;
1238                                 break;
1239                         case 1:
1240                                 pdata->clkout[num].multisynth_src =
1241                                         SI5351_MULTISYNTH_SRC_VCO1;
1242                                 break;
1243                         default:
1244                                 dev_err(&client->dev,
1245                                         "invalid parent %d for multisynth %d\n",
1246                                         val, num);
1247                                 goto put_child;
1248                         }
1249                 }
1250
1251                 if (!of_property_read_u32(child, "silabs,clock-source", &val)) {
1252                         switch (val) {
1253                         case 0:
1254                                 pdata->clkout[num].clkout_src =
1255                                         SI5351_CLKOUT_SRC_MSYNTH_N;
1256                                 break;
1257                         case 1:
1258                                 pdata->clkout[num].clkout_src =
1259                                         SI5351_CLKOUT_SRC_MSYNTH_0_4;
1260                                 break;
1261                         case 2:
1262                                 pdata->clkout[num].clkout_src =
1263                                         SI5351_CLKOUT_SRC_XTAL;
1264                                 break;
1265                         case 3:
1266                                 if (variant != SI5351_VARIANT_C) {
1267                                         dev_err(&client->dev,
1268                                                 "invalid parent %d for clkout %d\n",
1269                                                 val, num);
1270                                         goto put_child;
1271                                 }
1272                                 pdata->clkout[num].clkout_src =
1273                                         SI5351_CLKOUT_SRC_CLKIN;
1274                                 break;
1275                         default:
1276                                 dev_err(&client->dev,
1277                                         "invalid parent %d for clkout %d\n",
1278                                         val, num);
1279                                 goto put_child;
1280                         }
1281                 }
1282
1283                 if (!of_property_read_u32(child, "silabs,drive-strength",
1284                                           &val)) {
1285                         switch (val) {
1286                         case SI5351_DRIVE_2MA:
1287                         case SI5351_DRIVE_4MA:
1288                         case SI5351_DRIVE_6MA:
1289                         case SI5351_DRIVE_8MA:
1290                                 pdata->clkout[num].drive = val;
1291                                 break;
1292                         default:
1293                                 dev_err(&client->dev,
1294                                         "invalid drive strength %d for clkout %d\n",
1295                                         val, num);
1296                                 goto put_child;
1297                         }
1298                 }
1299
1300                 if (!of_property_read_u32(child, "silabs,disable-state",
1301                                           &val)) {
1302                         switch (val) {
1303                         case 0:
1304                                 pdata->clkout[num].disable_state =
1305                                         SI5351_DISABLE_LOW;
1306                                 break;
1307                         case 1:
1308                                 pdata->clkout[num].disable_state =
1309                                         SI5351_DISABLE_HIGH;
1310                                 break;
1311                         case 2:
1312                                 pdata->clkout[num].disable_state =
1313                                         SI5351_DISABLE_FLOATING;
1314                                 break;
1315                         case 3:
1316                                 pdata->clkout[num].disable_state =
1317                                         SI5351_DISABLE_NEVER;
1318                                 break;
1319                         default:
1320                                 dev_err(&client->dev,
1321                                         "invalid disable state %d for clkout %d\n",
1322                                         val, num);
1323                                 goto put_child;
1324                         }
1325                 }
1326
1327                 if (!of_property_read_u32(child, "clock-frequency", &val))
1328                         pdata->clkout[num].rate = val;
1329
1330                 pdata->clkout[num].pll_master =
1331                         of_property_read_bool(child, "silabs,pll-master");
1332
1333                 pdata->clkout[num].pll_reset =
1334                         of_property_read_bool(child, "silabs,pll-reset");
1335         }
1336         client->dev.platform_data = pdata;
1337
1338         return 0;
1339 put_child:
1340         of_node_put(child);
1341         return -EINVAL;
1342 }
1343
1344 static struct clk_hw *
1345 si53351_of_clk_get(struct of_phandle_args *clkspec, void *data)
1346 {
1347         struct si5351_driver_data *drvdata = data;
1348         unsigned int idx = clkspec->args[0];
1349
1350         if (idx >= drvdata->num_clkout) {
1351                 pr_err("%s: invalid index %u\n", __func__, idx);
1352                 return ERR_PTR(-EINVAL);
1353         }
1354
1355         return &drvdata->clkout[idx].hw;
1356 }
1357 #else
1358 static int si5351_dt_parse(struct i2c_client *client, enum si5351_variant variant)
1359 {
1360         return 0;
1361 }
1362
1363 static struct clk_hw *
1364 si53351_of_clk_get(struct of_phandle_args *clkspec, void *data)
1365 {
1366         return NULL;
1367 }
1368 #endif /* CONFIG_OF */
1369
1370 static int si5351_i2c_probe(struct i2c_client *client,
1371                             const struct i2c_device_id *id)
1372 {
1373         enum si5351_variant variant = (enum si5351_variant)id->driver_data;
1374         struct si5351_platform_data *pdata;
1375         struct si5351_driver_data *drvdata;
1376         struct clk_init_data init;
1377         const char *parent_names[4];
1378         u8 num_parents, num_clocks;
1379         int ret, n;
1380
1381         ret = si5351_dt_parse(client, variant);
1382         if (ret)
1383                 return ret;
1384
1385         pdata = client->dev.platform_data;
1386         if (!pdata)
1387                 return -EINVAL;
1388
1389         drvdata = devm_kzalloc(&client->dev, sizeof(*drvdata), GFP_KERNEL);
1390         if (!drvdata)
1391                 return -ENOMEM;
1392
1393         i2c_set_clientdata(client, drvdata);
1394         drvdata->client = client;
1395         drvdata->variant = variant;
1396         drvdata->pxtal = devm_clk_get(&client->dev, "xtal");
1397         drvdata->pclkin = devm_clk_get(&client->dev, "clkin");
1398
1399         if (PTR_ERR(drvdata->pxtal) == -EPROBE_DEFER ||
1400             PTR_ERR(drvdata->pclkin) == -EPROBE_DEFER)
1401                 return -EPROBE_DEFER;
1402
1403         /*
1404          * Check for valid parent clock: VARIANT_A and VARIANT_B need XTAL,
1405          *   VARIANT_C can have CLKIN instead.
1406          */
1407         if (IS_ERR(drvdata->pxtal) &&
1408             (drvdata->variant != SI5351_VARIANT_C || IS_ERR(drvdata->pclkin))) {
1409                 dev_err(&client->dev, "missing parent clock\n");
1410                 return -EINVAL;
1411         }
1412
1413         drvdata->regmap = devm_regmap_init_i2c(client, &si5351_regmap_config);
1414         if (IS_ERR(drvdata->regmap)) {
1415                 dev_err(&client->dev, "failed to allocate register map\n");
1416                 return PTR_ERR(drvdata->regmap);
1417         }
1418
1419         /* Disable interrupts */
1420         si5351_reg_write(drvdata, SI5351_INTERRUPT_MASK, 0xf0);
1421         /* Ensure pll select is on XTAL for Si5351A/B */
1422         if (drvdata->variant != SI5351_VARIANT_C)
1423                 si5351_set_bits(drvdata, SI5351_PLL_INPUT_SOURCE,
1424                                 SI5351_PLLA_SOURCE | SI5351_PLLB_SOURCE, 0);
1425
1426         /* setup clock configuration */
1427         for (n = 0; n < 2; n++) {
1428                 ret = _si5351_pll_reparent(drvdata, n, pdata->pll_src[n]);
1429                 if (ret) {
1430                         dev_err(&client->dev,
1431                                 "failed to reparent pll %d to %d\n",
1432                                 n, pdata->pll_src[n]);
1433                         return ret;
1434                 }
1435         }
1436
1437         for (n = 0; n < 8; n++) {
1438                 ret = _si5351_msynth_reparent(drvdata, n,
1439                                               pdata->clkout[n].multisynth_src);
1440                 if (ret) {
1441                         dev_err(&client->dev,
1442                                 "failed to reparent multisynth %d to %d\n",
1443                                 n, pdata->clkout[n].multisynth_src);
1444                         return ret;
1445                 }
1446
1447                 ret = _si5351_clkout_reparent(drvdata, n,
1448                                               pdata->clkout[n].clkout_src);
1449                 if (ret) {
1450                         dev_err(&client->dev,
1451                                 "failed to reparent clkout %d to %d\n",
1452                                 n, pdata->clkout[n].clkout_src);
1453                         return ret;
1454                 }
1455
1456                 ret = _si5351_clkout_set_drive_strength(drvdata, n,
1457                                                         pdata->clkout[n].drive);
1458                 if (ret) {
1459                         dev_err(&client->dev,
1460                                 "failed set drive strength of clkout%d to %d\n",
1461                                 n, pdata->clkout[n].drive);
1462                         return ret;
1463                 }
1464
1465                 ret = _si5351_clkout_set_disable_state(drvdata, n,
1466                                                 pdata->clkout[n].disable_state);
1467                 if (ret) {
1468                         dev_err(&client->dev,
1469                                 "failed set disable state of clkout%d to %d\n",
1470                                 n, pdata->clkout[n].disable_state);
1471                         return ret;
1472                 }
1473         }
1474
1475         /* register xtal input clock gate */
1476         memset(&init, 0, sizeof(init));
1477         init.name = si5351_input_names[0];
1478         init.ops = &si5351_xtal_ops;
1479         init.flags = 0;
1480         if (!IS_ERR(drvdata->pxtal)) {
1481                 drvdata->pxtal_name = __clk_get_name(drvdata->pxtal);
1482                 init.parent_names = &drvdata->pxtal_name;
1483                 init.num_parents = 1;
1484         }
1485         drvdata->xtal.init = &init;
1486         ret = devm_clk_hw_register(&client->dev, &drvdata->xtal);
1487         if (ret) {
1488                 dev_err(&client->dev, "unable to register %s\n", init.name);
1489                 return ret;
1490         }
1491
1492         /* register clkin input clock gate */
1493         if (drvdata->variant == SI5351_VARIANT_C) {
1494                 memset(&init, 0, sizeof(init));
1495                 init.name = si5351_input_names[1];
1496                 init.ops = &si5351_clkin_ops;
1497                 if (!IS_ERR(drvdata->pclkin)) {
1498                         drvdata->pclkin_name = __clk_get_name(drvdata->pclkin);
1499                         init.parent_names = &drvdata->pclkin_name;
1500                         init.num_parents = 1;
1501                 }
1502                 drvdata->clkin.init = &init;
1503                 ret = devm_clk_hw_register(&client->dev, &drvdata->clkin);
1504                 if (ret) {
1505                         dev_err(&client->dev, "unable to register %s\n",
1506                                 init.name);
1507                         return ret;
1508                 }
1509         }
1510
1511         /* Si5351C allows to mux either xtal or clkin to PLL input */
1512         num_parents = (drvdata->variant == SI5351_VARIANT_C) ? 2 : 1;
1513         parent_names[0] = si5351_input_names[0];
1514         parent_names[1] = si5351_input_names[1];
1515
1516         /* register PLLA */
1517         drvdata->pll[0].num = 0;
1518         drvdata->pll[0].drvdata = drvdata;
1519         drvdata->pll[0].hw.init = &init;
1520         memset(&init, 0, sizeof(init));
1521         init.name = si5351_pll_names[0];
1522         init.ops = &si5351_pll_ops;
1523         init.flags = 0;
1524         init.parent_names = parent_names;
1525         init.num_parents = num_parents;
1526         ret = devm_clk_hw_register(&client->dev, &drvdata->pll[0].hw);
1527         if (ret) {
1528                 dev_err(&client->dev, "unable to register %s\n", init.name);
1529                 return ret;
1530         }
1531
1532         /* register PLLB or VXCO (Si5351B) */
1533         drvdata->pll[1].num = 1;
1534         drvdata->pll[1].drvdata = drvdata;
1535         drvdata->pll[1].hw.init = &init;
1536         memset(&init, 0, sizeof(init));
1537         if (drvdata->variant == SI5351_VARIANT_B) {
1538                 init.name = si5351_pll_names[2];
1539                 init.ops = &si5351_vxco_ops;
1540                 init.flags = 0;
1541                 init.parent_names = NULL;
1542                 init.num_parents = 0;
1543         } else {
1544                 init.name = si5351_pll_names[1];
1545                 init.ops = &si5351_pll_ops;
1546                 init.flags = 0;
1547                 init.parent_names = parent_names;
1548                 init.num_parents = num_parents;
1549         }
1550         ret = devm_clk_hw_register(&client->dev, &drvdata->pll[1].hw);
1551         if (ret) {
1552                 dev_err(&client->dev, "unable to register %s\n", init.name);
1553                 return ret;
1554         }
1555
1556         /* register clk multisync and clk out divider */
1557         num_clocks = (drvdata->variant == SI5351_VARIANT_A3) ? 3 : 8;
1558         parent_names[0] = si5351_pll_names[0];
1559         if (drvdata->variant == SI5351_VARIANT_B)
1560                 parent_names[1] = si5351_pll_names[2];
1561         else
1562                 parent_names[1] = si5351_pll_names[1];
1563
1564         drvdata->msynth = devm_kcalloc(&client->dev, num_clocks,
1565                                        sizeof(*drvdata->msynth), GFP_KERNEL);
1566         drvdata->clkout = devm_kcalloc(&client->dev, num_clocks,
1567                                        sizeof(*drvdata->clkout), GFP_KERNEL);
1568         drvdata->num_clkout = num_clocks;
1569
1570         if (WARN_ON(!drvdata->msynth || !drvdata->clkout)) {
1571                 ret = -ENOMEM;
1572                 return ret;
1573         }
1574
1575         for (n = 0; n < num_clocks; n++) {
1576                 drvdata->msynth[n].num = n;
1577                 drvdata->msynth[n].drvdata = drvdata;
1578                 drvdata->msynth[n].hw.init = &init;
1579                 memset(&init, 0, sizeof(init));
1580                 init.name = si5351_msynth_names[n];
1581                 init.ops = &si5351_msynth_ops;
1582                 init.flags = 0;
1583                 if (pdata->clkout[n].pll_master)
1584                         init.flags |= CLK_SET_RATE_PARENT;
1585                 init.parent_names = parent_names;
1586                 init.num_parents = 2;
1587                 ret = devm_clk_hw_register(&client->dev,
1588                                            &drvdata->msynth[n].hw);
1589                 if (ret) {
1590                         dev_err(&client->dev, "unable to register %s\n",
1591                                 init.name);
1592                         return ret;
1593                 }
1594         }
1595
1596         num_parents = (drvdata->variant == SI5351_VARIANT_C) ? 4 : 3;
1597         parent_names[2] = si5351_input_names[0];
1598         parent_names[3] = si5351_input_names[1];
1599         for (n = 0; n < num_clocks; n++) {
1600                 parent_names[0] = si5351_msynth_names[n];
1601                 parent_names[1] = (n < 4) ? si5351_msynth_names[0] :
1602                         si5351_msynth_names[4];
1603
1604                 drvdata->clkout[n].num = n;
1605                 drvdata->clkout[n].drvdata = drvdata;
1606                 drvdata->clkout[n].hw.init = &init;
1607                 memset(&init, 0, sizeof(init));
1608                 init.name = si5351_clkout_names[n];
1609                 init.ops = &si5351_clkout_ops;
1610                 init.flags = 0;
1611                 if (pdata->clkout[n].clkout_src == SI5351_CLKOUT_SRC_MSYNTH_N)
1612                         init.flags |= CLK_SET_RATE_PARENT;
1613                 init.parent_names = parent_names;
1614                 init.num_parents = num_parents;
1615                 ret = devm_clk_hw_register(&client->dev,
1616                                            &drvdata->clkout[n].hw);
1617                 if (ret) {
1618                         dev_err(&client->dev, "unable to register %s\n",
1619                                 init.name);
1620                         return ret;
1621                 }
1622
1623                 /* set initial clkout rate */
1624                 if (pdata->clkout[n].rate != 0) {
1625                         int ret;
1626                         ret = clk_set_rate(drvdata->clkout[n].hw.clk,
1627                                            pdata->clkout[n].rate);
1628                         if (ret != 0) {
1629                                 dev_err(&client->dev, "Cannot set rate : %d\n",
1630                                         ret);
1631                         }
1632                 }
1633         }
1634
1635         ret = of_clk_add_hw_provider(client->dev.of_node, si53351_of_clk_get,
1636                                      drvdata);
1637         if (ret) {
1638                 dev_err(&client->dev, "unable to add clk provider\n");
1639                 return ret;
1640         }
1641
1642         return 0;
1643 }
1644
1645 static int si5351_i2c_remove(struct i2c_client *client)
1646 {
1647         of_clk_del_provider(client->dev.of_node);
1648
1649         return 0;
1650 }
1651
1652 static const struct i2c_device_id si5351_i2c_ids[] = {
1653         { "si5351a", SI5351_VARIANT_A },
1654         { "si5351a-msop", SI5351_VARIANT_A3 },
1655         { "si5351b", SI5351_VARIANT_B },
1656         { "si5351c", SI5351_VARIANT_C },
1657         { }
1658 };
1659 MODULE_DEVICE_TABLE(i2c, si5351_i2c_ids);
1660
1661 static struct i2c_driver si5351_driver = {
1662         .driver = {
1663                 .name = "si5351",
1664                 .of_match_table = of_match_ptr(si5351_dt_ids),
1665         },
1666         .probe = si5351_i2c_probe,
1667         .remove = si5351_i2c_remove,
1668         .id_table = si5351_i2c_ids,
1669 };
1670 module_i2c_driver(si5351_driver);
1671
1672 MODULE_AUTHOR("Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com");
1673 MODULE_DESCRIPTION("Silicon Labs Si5351A/B/C clock generator driver");
1674 MODULE_LICENSE("GPL");