drivers/clk/clk-versaclock5.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Driver for IDT Versaclock 5
   4  *
   5  * Copyright (C) 2017 Marek Vasut <marek.vasut@gmail.com>
   6  */
   7
   8 /*
   9  * Possible optimizations:
  10  * - Use spread spectrum
  11  * - Use integer divider in FOD if applicable
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/clk-provider.h>
  16 #include <linux/delay.h>
  17 #include <linux/i2c.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/mod_devicetable.h>
  20 #include <linux/module.h>
  21 #include <linux/of.h>
  22 #include <linux/of_platform.h>
  23 #include <linux/rational.h>
  24 #include <linux/regmap.h>
  25 #include <linux/slab.h>
  26
  27 #include <dt-bindings/clk/versaclock.h>
  28
  29 /* VersaClock5 registers */
  30 #define VC5_OTP_CONTROL                         0x00
  31
  32 /* Factory-reserved register block */
  33 #define VC5_RSVD_DEVICE_ID                      0x01
  34 #define VC5_RSVD_ADC_GAIN_7_0                   0x02
  35 #define VC5_RSVD_ADC_GAIN_15_8                  0x03
  36 #define VC5_RSVD_ADC_OFFSET_7_0                 0x04
  37 #define VC5_RSVD_ADC_OFFSET_15_8                0x05
  38 #define VC5_RSVD_TEMPY                          0x06
  39 #define VC5_RSVD_OFFSET_TBIN                    0x07
  40 #define VC5_RSVD_GAIN                           0x08
  41 #define VC5_RSVD_TEST_NP                        0x09
  42 #define VC5_RSVD_UNUSED                         0x0a
  43 #define VC5_RSVD_BANDGAP_TRIM_UP                0x0b
  44 #define VC5_RSVD_BANDGAP_TRIM_DN                0x0c
  45 #define VC5_RSVD_CLK_R_12_CLK_AMP_4             0x0d
  46 #define VC5_RSVD_CLK_R_34_CLK_AMP_4             0x0e
  47 #define VC5_RSVD_CLK_AMP_123                    0x0f
  48
  49 /* Configuration register block */
  50 #define VC5_PRIM_SRC_SHDN                       0x10
  51 #define VC5_PRIM_SRC_SHDN_EN_XTAL               BIT(7)
  52 #define VC5_PRIM_SRC_SHDN_EN_CLKIN              BIT(6)
  53 #define VC5_PRIM_SRC_SHDN_EN_DOUBLE_XTAL_FREQ   BIT(3)
  54 #define VC5_PRIM_SRC_SHDN_SP                    BIT(1)
  55 #define VC5_PRIM_SRC_SHDN_EN_GBL_SHDN           BIT(0)
  56
  57 #define VC5_VCO_BAND                            0x11
  58 #define VC5_XTAL_X1_LOAD_CAP                    0x12
  59 #define VC5_XTAL_X2_LOAD_CAP                    0x13
  60 #define VC5_REF_DIVIDER                         0x15
  61 #define VC5_REF_DIVIDER_SEL_PREDIV2             BIT(7)
  62 #define VC5_REF_DIVIDER_REF_DIV(n)              ((n) & 0x3f)
  63
  64 #define VC5_VCO_CTRL_AND_PREDIV                 0x16
  65 #define VC5_VCO_CTRL_AND_PREDIV_BYPASS_PREDIV   BIT(7)
  66
  67 #define VC5_FEEDBACK_INT_DIV                    0x17
  68 #define VC5_FEEDBACK_INT_DIV_BITS               0x18
  69 #define VC5_FEEDBACK_FRAC_DIV(n)                (0x19 + (n))
  70 #define VC5_RC_CONTROL0                         0x1e
  71 #define VC5_RC_CONTROL1                         0x1f
  72
  73 /* These registers are named "Unused Factory Reserved Registers" */
  74 #define VC5_RESERVED_X0(idx)            (0x20 + ((idx) * 0x10))
  75 #define VC5_RESERVED_X0_BYPASS_SYNC     BIT(7) /* bypass_sync<idx> bit */
  76
  77 /* Output divider control for divider 1,2,3,4 */
  78 #define VC5_OUT_DIV_CONTROL(idx)        (0x21 + ((idx) * 0x10))
  79 #define VC5_OUT_DIV_CONTROL_RESET       BIT(7)
  80 #define VC5_OUT_DIV_CONTROL_SELB_NORM   BIT(3)
  81 #define VC5_OUT_DIV_CONTROL_SEL_EXT     BIT(2)
  82 #define VC5_OUT_DIV_CONTROL_INT_MODE    BIT(1)
  83 #define VC5_OUT_DIV_CONTROL_EN_FOD      BIT(0)
  84
  85 #define VC5_OUT_DIV_FRAC(idx, n)        (0x22 + ((idx) * 0x10) + (n))
  86 #define VC5_OUT_DIV_FRAC4_OD_SCEE       BIT(1)
  87
  88 #define VC5_OUT_DIV_STEP_SPREAD(idx, n) (0x26 + ((idx) * 0x10) + (n))
  89 #define VC5_OUT_DIV_SPREAD_MOD(idx, n)  (0x29 + ((idx) * 0x10) + (n))
  90 #define VC5_OUT_DIV_SKEW_INT(idx, n)    (0x2b + ((idx) * 0x10) + (n))
  91 #define VC5_OUT_DIV_INT(idx, n)         (0x2d + ((idx) * 0x10) + (n))
  92 #define VC5_OUT_DIV_SKEW_FRAC(idx)      (0x2f + ((idx) * 0x10))
  93
  94 /* Clock control register for clock 1,2 */
  95 #define VC5_CLK_OUTPUT_CFG(idx, n)      (0x60 + ((idx) * 0x2) + (n))
  96 #define VC5_CLK_OUTPUT_CFG0_CFG_SHIFT   5
  97 #define VC5_CLK_OUTPUT_CFG0_CFG_MASK GENMASK(7, VC5_CLK_OUTPUT_CFG0_CFG_SHIFT)
  98
  99 #define VC5_CLK_OUTPUT_CFG0_CFG_LVPECL  (VC5_LVPECL)
 100 #define VC5_CLK_OUTPUT_CFG0_CFG_CMOS            (VC5_CMOS)
 101 #define VC5_CLK_OUTPUT_CFG0_CFG_HCSL33  (VC5_HCSL33)
 102 #define VC5_CLK_OUTPUT_CFG0_CFG_LVDS            (VC5_LVDS)
 103 #define VC5_CLK_OUTPUT_CFG0_CFG_CMOS2           (VC5_CMOS2)
 104 #define VC5_CLK_OUTPUT_CFG0_CFG_CMOSD           (VC5_CMOSD)
 105 #define VC5_CLK_OUTPUT_CFG0_CFG_HCSL25  (VC5_HCSL25)
 106
 107 #define VC5_CLK_OUTPUT_CFG0_PWR_SHIFT   3
 108 #define VC5_CLK_OUTPUT_CFG0_PWR_MASK GENMASK(4, VC5_CLK_OUTPUT_CFG0_PWR_SHIFT)
 109 #define VC5_CLK_OUTPUT_CFG0_PWR_18      (0<<VC5_CLK_OUTPUT_CFG0_PWR_SHIFT)
 110 #define VC5_CLK_OUTPUT_CFG0_PWR_25      (2<<VC5_CLK_OUTPUT_CFG0_PWR_SHIFT)
 111 #define VC5_CLK_OUTPUT_CFG0_PWR_33      (3<<VC5_CLK_OUTPUT_CFG0_PWR_SHIFT)
 112 #define VC5_CLK_OUTPUT_CFG0_SLEW_SHIFT  0
 113 #define VC5_CLK_OUTPUT_CFG0_SLEW_MASK GENMASK(1, VC5_CLK_OUTPUT_CFG0_SLEW_SHIFT)
 114 #define VC5_CLK_OUTPUT_CFG0_SLEW_80     (0<<VC5_CLK_OUTPUT_CFG0_SLEW_SHIFT)
 115 #define VC5_CLK_OUTPUT_CFG0_SLEW_85     (1<<VC5_CLK_OUTPUT_CFG0_SLEW_SHIFT)
 116 #define VC5_CLK_OUTPUT_CFG0_SLEW_90     (2<<VC5_CLK_OUTPUT_CFG0_SLEW_SHIFT)
 117 #define VC5_CLK_OUTPUT_CFG0_SLEW_100    (3<<VC5_CLK_OUTPUT_CFG0_SLEW_SHIFT)
 118 #define VC5_CLK_OUTPUT_CFG1_EN_CLKBUF   BIT(0)
 119
 120 #define VC5_CLK_OE_SHDN                         0x68
 121 #define VC5_CLK_OS_SHDN                         0x69
 122
 123 #define VC5_GLOBAL_REGISTER                     0x76
 124 #define VC5_GLOBAL_REGISTER_GLOBAL_RESET        BIT(5)
 125
 126 /* PLL/VCO runs between 2.5 GHz and 3.0 GHz */
 127 #define VC5_PLL_VCO_MIN                         2500000000UL
 128 #define VC5_PLL_VCO_MAX                         3000000000UL
 129
 130 /* VC5 Input mux settings */
 131 #define VC5_MUX_IN_XIN          BIT(0)
 132 #define VC5_MUX_IN_CLKIN        BIT(1)
 133
 134 /* Maximum number of clk_out supported by this driver */
 135 #define VC5_MAX_CLK_OUT_NUM     5
 136
 137 /* Maximum number of FODs supported by this driver */
 138 #define VC5_MAX_FOD_NUM 4
 139
 140 /* flags to describe chip features */
 141 /* chip has built-in oscilator */
 142 #define VC5_HAS_INTERNAL_XTAL   BIT(0)
 143 /* chip has PFD requency doubler */
 144 #define VC5_HAS_PFD_FREQ_DBL    BIT(1)
 145 /* chip has bits to disable FOD sync */
 146 #define VC5_HAS_BYPASS_SYNC_BIT BIT(2)
 147
 148 /* Supported IDT VC5 models. */
 149 enum vc5_model {
 150         IDT_VC5_5P49V5923,
 151         IDT_VC5_5P49V5925,
 152         IDT_VC5_5P49V5933,
 153         IDT_VC5_5P49V5935,
 154         IDT_VC6_5P49V6901,
 155         IDT_VC6_5P49V6965,
 156 };
 157
 158 /* Structure to describe features of a particular VC5 model */
 159 struct vc5_chip_info {
 160         const enum vc5_model    model;
 161         const unsigned int      clk_fod_cnt;
 162         const unsigned int      clk_out_cnt;
 163         const u32               flags;
 164 };
 165
 166 struct vc5_driver_data;
 167
 168 struct vc5_hw_data {
 169         struct clk_hw           hw;
 170         struct vc5_driver_data  *vc5;
 171         u32                     div_int;
 172         u32                     div_frc;
 173         unsigned int            num;
 174 };
 175
 176 struct vc5_out_data {
 177         struct clk_hw           hw;
 178         struct vc5_driver_data  *vc5;
 179         unsigned int            num;
 180         unsigned int            clk_output_cfg0;
 181         unsigned int            clk_output_cfg0_mask;
 182 };
 183
 184 struct vc5_driver_data {
 185         struct i2c_client       *client;
 186         struct regmap           *regmap;
 187         const struct vc5_chip_info      *chip_info;
 188
 189         struct clk              *pin_xin;
 190         struct clk              *pin_clkin;
 191         unsigned char           clk_mux_ins;
 192         struct clk_hw           clk_mux;
 193         struct clk_hw           clk_mul;
 194         struct clk_hw           clk_pfd;
 195         struct vc5_hw_data      clk_pll;
 196         struct vc5_hw_data      clk_fod[VC5_MAX_FOD_NUM];
 197         struct vc5_out_data     clk_out[VC5_MAX_CLK_OUT_NUM];
 198 };
 199
 200 /*
 201  * VersaClock5 i2c regmap
 202  */
 203 static bool vc5_regmap_is_writeable(struct device *dev, unsigned int reg)
 204 {
 205         /* Factory reserved regs, make them read-only */
 206         if (reg <= 0xf)
 207                 return false;
 208
 209         /* Factory reserved regs, make them read-only */
 210         if (reg == 0x14 || reg == 0x1c || reg == 0x1d)
 211                 return false;
 212
 213         return true;
 214 }
 215
 216 static const struct regmap_config vc5_regmap_config = {
 217         .reg_bits = 8,
 218         .val_bits = 8,
 219         .cache_type = REGCACHE_RBTREE,
 220         .max_register = 0x76,
 221         .writeable_reg = vc5_regmap_is_writeable,
 222 };
 223
 224 /*
 225  * VersaClock5 input multiplexer between XTAL and CLKIN divider
 226  */
 227 static unsigned char vc5_mux_get_parent(struct clk_hw *hw)
 228 {
 229         struct vc5_driver_data *vc5 =
 230                 container_of(hw, struct vc5_driver_data, clk_mux);
 231         const u8 mask = VC5_PRIM_SRC_SHDN_EN_XTAL | VC5_PRIM_SRC_SHDN_EN_CLKIN;
 232         unsigned int src;
 233
 234         regmap_read(vc5->regmap, VC5_PRIM_SRC_SHDN, &src);
 235         src &= mask;
 236
 237         if (src == VC5_PRIM_SRC_SHDN_EN_XTAL)
 238                 return 0;
 239
 240         if (src == VC5_PRIM_SRC_SHDN_EN_CLKIN)
 241                 return 1;
 242
 243         dev_warn(&vc5->client->dev,
 244                  "Invalid clock input configuration (%02x)\n", src);
 245         return 0;
 246 }
 247
 248 static int vc5_mux_set_parent(struct clk_hw *hw, u8 index)
 249 {
 250         struct vc5_driver_data *vc5 =
 251                 container_of(hw, struct vc5_driver_data, clk_mux);
 252         const u8 mask = VC5_PRIM_SRC_SHDN_EN_XTAL | VC5_PRIM_SRC_SHDN_EN_CLKIN;
 253         u8 src;
 254
 255         if ((index > 1) || !vc5->clk_mux_ins)
 256                 return -EINVAL;
 257
 258         if (vc5->clk_mux_ins == (VC5_MUX_IN_CLKIN | VC5_MUX_IN_XIN)) {
 259                 if (index == 0)
 260                         src = VC5_PRIM_SRC_SHDN_EN_XTAL;
 261                 if (index == 1)
 262                         src = VC5_PRIM_SRC_SHDN_EN_CLKIN;
 263         } else {
 264                 if (index != 0)
 265                         return -EINVAL;
 266
 267                 if (vc5->clk_mux_ins == VC5_MUX_IN_XIN)
 268                         src = VC5_PRIM_SRC_SHDN_EN_XTAL;
 269                 else if (vc5->clk_mux_ins == VC5_MUX_IN_CLKIN)
 270                         src = VC5_PRIM_SRC_SHDN_EN_CLKIN;
 271                 else /* Invalid; should have been caught by vc5_probe() */
 272                         return -EINVAL;
 273         }
 274
 275         return regmap_update_bits(vc5->regmap, VC5_PRIM_SRC_SHDN, mask, src);
 276 }
 277
 278 static const struct clk_ops vc5_mux_ops = {
 279         .set_parent     = vc5_mux_set_parent,
 280         .get_parent     = vc5_mux_get_parent,
 281 };
 282
 283 static unsigned long vc5_dbl_recalc_rate(struct clk_hw *hw,
 284                                          unsigned long parent_rate)
 285 {
 286         struct vc5_driver_data *vc5 =
 287                 container_of(hw, struct vc5_driver_data, clk_mul);
 288         unsigned int premul;
 289
 290         regmap_read(vc5->regmap, VC5_PRIM_SRC_SHDN, &premul);
 291         if (premul & VC5_PRIM_SRC_SHDN_EN_DOUBLE_XTAL_FREQ)
 292                 parent_rate *= 2;
 293
 294         return parent_rate;
 295 }
 296
 297 static long vc5_dbl_round_rate(struct clk_hw *hw, unsigned long rate,
 298                                unsigned long *parent_rate)
 299 {
 300         if ((*parent_rate == rate) || ((*parent_rate * 2) == rate))
 301                 return rate;
 302         else
 303                 return -EINVAL;
 304 }
 305
 306 static int vc5_dbl_set_rate(struct clk_hw *hw, unsigned long rate,
 307                             unsigned long parent_rate)
 308 {
 309         struct vc5_driver_data *vc5 =
 310                 container_of(hw, struct vc5_driver_data, clk_mul);
 311         u32 mask;
 312
 313         if ((parent_rate * 2) == rate)
 314                 mask = VC5_PRIM_SRC_SHDN_EN_DOUBLE_XTAL_FREQ;
 315         else
 316                 mask = 0;
 317
 318         regmap_update_bits(vc5->regmap, VC5_PRIM_SRC_SHDN,
 319                            VC5_PRIM_SRC_SHDN_EN_DOUBLE_XTAL_FREQ,
 320                            mask);
 321
 322         return 0;
 323 }
 324
 325 static const struct clk_ops vc5_dbl_ops = {
 326         .recalc_rate    = vc5_dbl_recalc_rate,
 327         .round_rate     = vc5_dbl_round_rate,
 328         .set_rate       = vc5_dbl_set_rate,
 329 };
 330
 331 static unsigned long vc5_pfd_recalc_rate(struct clk_hw *hw,
 332                                          unsigned long parent_rate)
 333 {
 334         struct vc5_driver_data *vc5 =
 335                 container_of(hw, struct vc5_driver_data, clk_pfd);
 336         unsigned int prediv, div;
 337
 338         regmap_read(vc5->regmap, VC5_VCO_CTRL_AND_PREDIV, &prediv);
 339
 340         /* The bypass_prediv is set, PLL fed from Ref_in directly. */
 341         if (prediv & VC5_VCO_CTRL_AND_PREDIV_BYPASS_PREDIV)
 342                 return parent_rate;
 343
 344         regmap_read(vc5->regmap, VC5_REF_DIVIDER, &div);
 345
 346         /* The Sel_prediv2 is set, PLL fed from prediv2 (Ref_in / 2) */
 347         if (div & VC5_REF_DIVIDER_SEL_PREDIV2)
 348                 return parent_rate / 2;
 349         else
 350                 return parent_rate / VC5_REF_DIVIDER_REF_DIV(div);
 351 }
 352
 353 static long vc5_pfd_round_rate(struct clk_hw *hw, unsigned long rate,
 354                                unsigned long *parent_rate)
 355 {
 356         unsigned long idiv;
 357
 358         /* PLL cannot operate with input clock above 50 MHz. */
 359         if (rate > 50000000)
 360                 return -EINVAL;
 361
 362         /* CLKIN within range of PLL input, feed directly to PLL. */
 363         if (*parent_rate <= 50000000)
 364                 return *parent_rate;
 365
 366         idiv = DIV_ROUND_UP(*parent_rate, rate);
 367         if (idiv > 127)
 368                 return -EINVAL;
 369
 370         return *parent_rate / idiv;
 371 }
 372
 373 static int vc5_pfd_set_rate(struct clk_hw *hw, unsigned long rate,
 374                             unsigned long parent_rate)
 375 {
 376         struct vc5_driver_data *vc5 =
 377                 container_of(hw, struct vc5_driver_data, clk_pfd);
 378         unsigned long idiv;
 379         u8 div;
 380
 381         /* CLKIN within range of PLL input, feed directly to PLL. */
 382         if (parent_rate <= 50000000) {
 383                 regmap_update_bits(vc5->regmap, VC5_VCO_CTRL_AND_PREDIV,
 384                                    VC5_VCO_CTRL_AND_PREDIV_BYPASS_PREDIV,
 385                                    VC5_VCO_CTRL_AND_PREDIV_BYPASS_PREDIV);
 386                 regmap_update_bits(vc5->regmap, VC5_REF_DIVIDER, 0xff, 0x00);
 387                 return 0;
 388         }
 389
 390         idiv = DIV_ROUND_UP(parent_rate, rate);
 391
 392         /* We have dedicated div-2 predivider. */
 393         if (idiv == 2)
 394                 div = VC5_REF_DIVIDER_SEL_PREDIV2;
 395         else
 396                 div = VC5_REF_DIVIDER_REF_DIV(idiv);
 397
 398         regmap_update_bits(vc5->regmap, VC5_REF_DIVIDER, 0xff, div);
 399         regmap_update_bits(vc5->regmap, VC5_VCO_CTRL_AND_PREDIV,
 400                            VC5_VCO_CTRL_AND_PREDIV_BYPASS_PREDIV, 0);
 401
 402         return 0;
 403 }
 404
 405 static const struct clk_ops vc5_pfd_ops = {
 406         .recalc_rate    = vc5_pfd_recalc_rate,
 407         .round_rate     = vc5_pfd_round_rate,
 408         .set_rate       = vc5_pfd_set_rate,
 409 };
 410
 411 /*
 412  * VersaClock5 PLL/VCO
 413  */
 414 static unsigned long vc5_pll_recalc_rate(struct clk_hw *hw,
 415                                          unsigned long parent_rate)
 416 {
 417         struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
 418         struct vc5_driver_data *vc5 = hwdata->vc5;
 419         u32 div_int, div_frc;
 420         u8 fb[5];
 421
 422         regmap_bulk_read(vc5->regmap, VC5_FEEDBACK_INT_DIV, fb, 5);
 423
 424         div_int = (fb[0] << 4) | (fb[1] >> 4);
 425         div_frc = (fb[2] << 16) | (fb[3] << 8) | fb[4];
 426
 427         /* The PLL divider has 12 integer bits and 24 fractional bits */
 428         return (parent_rate * div_int) + ((parent_rate * div_frc) >> 24);
 429 }
 430
 431 static long vc5_pll_round_rate(struct clk_hw *hw, unsigned long rate,
 432                                unsigned long *parent_rate)
 433 {
 434         struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
 435         u32 div_int;
 436         u64 div_frc;
 437
 438         if (rate < VC5_PLL_VCO_MIN)
 439                 rate = VC5_PLL_VCO_MIN;
 440         if (rate > VC5_PLL_VCO_MAX)
 441                 rate = VC5_PLL_VCO_MAX;
 442
 443         /* Determine integer part, which is 12 bit wide */
 444         div_int = rate / *parent_rate;
 445         if (div_int > 0xfff)
 446                 rate = *parent_rate * 0xfff;
 447
 448         /* Determine best fractional part, which is 24 bit wide */
 449         div_frc = rate % *parent_rate;
 450         div_frc *= BIT(24) - 1;
 451         do_div(div_frc, *parent_rate);
 452
 453         hwdata->div_int = div_int;
 454         hwdata->div_frc = (u32)div_frc;
 455
 456         return (*parent_rate * div_int) + ((*parent_rate * div_frc) >> 24);
 457 }
 458
 459 static int vc5_pll_set_rate(struct clk_hw *hw, unsigned long rate,
 460                             unsigned long parent_rate)
 461 {
 462         struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
 463         struct vc5_driver_data *vc5 = hwdata->vc5;
 464         u8 fb[5];
 465
 466         fb[0] = hwdata->div_int >> 4;
 467         fb[1] = hwdata->div_int << 4;
 468         fb[2] = hwdata->div_frc >> 16;
 469         fb[3] = hwdata->div_frc >> 8;
 470         fb[4] = hwdata->div_frc;
 471
 472         return regmap_bulk_write(vc5->regmap, VC5_FEEDBACK_INT_DIV, fb, 5);
 473 }
 474
 475 static const struct clk_ops vc5_pll_ops = {
 476         .recalc_rate    = vc5_pll_recalc_rate,
 477         .round_rate     = vc5_pll_round_rate,
 478         .set_rate       = vc5_pll_set_rate,
 479 };
 480
 481 static unsigned long vc5_fod_recalc_rate(struct clk_hw *hw,
 482                                          unsigned long parent_rate)
 483 {
 484         struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
 485         struct vc5_driver_data *vc5 = hwdata->vc5;
 486         /* VCO frequency is divided by two before entering FOD */
 487         u32 f_in = parent_rate / 2;
 488         u32 div_int, div_frc;
 489         u8 od_int[2];
 490         u8 od_frc[4];
 491
 492         regmap_bulk_read(vc5->regmap, VC5_OUT_DIV_INT(hwdata->num, 0),
 493                          od_int, 2);
 494         regmap_bulk_read(vc5->regmap, VC5_OUT_DIV_FRAC(hwdata->num, 0),
 495                          od_frc, 4);
 496
 497         div_int = (od_int[0] << 4) | (od_int[1] >> 4);
 498         div_frc = (od_frc[0] << 22) | (od_frc[1] << 14) |
 499                   (od_frc[2] << 6) | (od_frc[3] >> 2);
 500
 501         /* Avoid division by zero if the output is not configured. */
 502         if (div_int == 0 && div_frc == 0)
 503                 return 0;
 504
 505         /* The PLL divider has 12 integer bits and 30 fractional bits */
 506         return div64_u64((u64)f_in << 24ULL, ((u64)div_int << 24ULL) + div_frc);
 507 }
 508
 509 static long vc5_fod_round_rate(struct clk_hw *hw, unsigned long rate,
 510                                unsigned long *parent_rate)
 511 {
 512         struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
 513         /* VCO frequency is divided by two before entering FOD */
 514         u32 f_in = *parent_rate / 2;
 515         u32 div_int;
 516         u64 div_frc;
 517
 518         /* Determine integer part, which is 12 bit wide */
 519         div_int = f_in / rate;
 520         /*
 521          * WARNING: The clock chip does not output signal if the integer part
 522          *          of the divider is 0xfff and fractional part is non-zero.
 523          *          Clamp the divider at 0xffe to keep the code simple.
 524          */
 525         if (div_int > 0xffe) {
 526                 div_int = 0xffe;
 527                 rate = f_in / div_int;
 528         }
 529
 530         /* Determine best fractional part, which is 30 bit wide */
 531         div_frc = f_in % rate;
 532         div_frc <<= 24;
 533         do_div(div_frc, rate);
 534
 535         hwdata->div_int = div_int;
 536         hwdata->div_frc = (u32)div_frc;
 537
 538         return div64_u64((u64)f_in << 24ULL, ((u64)div_int << 24ULL) + div_frc);
 539 }
 540
 541 static int vc5_fod_set_rate(struct clk_hw *hw, unsigned long rate,
 542                             unsigned long parent_rate)
 543 {
 544         struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
 545         struct vc5_driver_data *vc5 = hwdata->vc5;
 546         u8 data[14] = {
 547                 hwdata->div_frc >> 22, hwdata->div_frc >> 14,
 548                 hwdata->div_frc >> 6, hwdata->div_frc << 2,
 549                 0, 0, 0, 0, 0,
 550                 0, 0,
 551                 hwdata->div_int >> 4, hwdata->div_int << 4,
 552                 0
 553         };
 554
 555         regmap_bulk_write(vc5->regmap, VC5_OUT_DIV_FRAC(hwdata->num, 0),
 556                           data, 14);
 557
 558         /*
 559          * Toggle magic bit in undocumented register for unknown reason.
 560          * This is what the IDT timing commander tool does and the chip
 561          * datasheet somewhat implies this is needed, but the register
 562          * and the bit is not documented.
 563          */
 564         regmap_update_bits(vc5->regmap, VC5_GLOBAL_REGISTER,
 565                            VC5_GLOBAL_REGISTER_GLOBAL_RESET, 0);
 566         regmap_update_bits(vc5->regmap, VC5_GLOBAL_REGISTER,
 567                            VC5_GLOBAL_REGISTER_GLOBAL_RESET,
 568                            VC5_GLOBAL_REGISTER_GLOBAL_RESET);
 569         return 0;
 570 }
 571
 572 static const struct clk_ops vc5_fod_ops = {
 573         .recalc_rate    = vc5_fod_recalc_rate,
 574         .round_rate     = vc5_fod_round_rate,
 575         .set_rate       = vc5_fod_set_rate,
 576 };
 577
 578 static int vc5_clk_out_prepare(struct clk_hw *hw)
 579 {
 580         struct vc5_out_data *hwdata = container_of(hw, struct vc5_out_data, hw);
 581         struct vc5_driver_data *vc5 = hwdata->vc5;
 582         const u8 mask = VC5_OUT_DIV_CONTROL_SELB_NORM |
 583                         VC5_OUT_DIV_CONTROL_SEL_EXT |
 584                         VC5_OUT_DIV_CONTROL_EN_FOD;
 585         unsigned int src;
 586         int ret;
 587
 588         /*
 589          * When enabling a FOD, all currently enabled FODs are briefly
 590          * stopped in order to synchronize all of them. This causes a clock
 591          * disruption to any unrelated chips that might be already using
 592          * other clock outputs. Bypass the sync feature to avoid the issue,
 593          * which is possible on the VersaClock 6E family via reserved
 594          * registers.
 595          */
 596         if (vc5->chip_info->flags & VC5_HAS_BYPASS_SYNC_BIT) {
 597                 ret = regmap_update_bits(vc5->regmap,
 598                                          VC5_RESERVED_X0(hwdata->num),
 599                                          VC5_RESERVED_X0_BYPASS_SYNC,
 600                                          VC5_RESERVED_X0_BYPASS_SYNC);
 601                 if (ret)
 602                         return ret;
 603         }
 604
 605         /*
 606          * If the input mux is disabled, enable it first and
 607          * select source from matching FOD.
 608          */
 609         regmap_read(vc5->regmap, VC5_OUT_DIV_CONTROL(hwdata->num), &src);
 610         if ((src & mask) == 0) {
 611                 src = VC5_OUT_DIV_CONTROL_RESET | VC5_OUT_DIV_CONTROL_EN_FOD;
 612                 ret = regmap_update_bits(vc5->regmap,
 613                                          VC5_OUT_DIV_CONTROL(hwdata->num),
 614                                          mask | VC5_OUT_DIV_CONTROL_RESET, src);
 615                 if (ret)
 616                         return ret;
 617         }
 618
 619         /* Enable the clock buffer */
 620         regmap_update_bits(vc5->regmap, VC5_CLK_OUTPUT_CFG(hwdata->num, 1),
 621                            VC5_CLK_OUTPUT_CFG1_EN_CLKBUF,
 622                            VC5_CLK_OUTPUT_CFG1_EN_CLKBUF);
 623         if (hwdata->clk_output_cfg0_mask) {
 624                 dev_dbg(&vc5->client->dev, "Update output %d mask 0x%0X val 0x%0X\n",
 625                         hwdata->num, hwdata->clk_output_cfg0_mask,
 626                         hwdata->clk_output_cfg0);
 627
 628                 regmap_update_bits(vc5->regmap,
 629                         VC5_CLK_OUTPUT_CFG(hwdata->num, 0),
 630                         hwdata->clk_output_cfg0_mask,
 631                         hwdata->clk_output_cfg0);
 632         }
 633
 634         return 0;
 635 }
 636
 637 static void vc5_clk_out_unprepare(struct clk_hw *hw)
 638 {
 639         struct vc5_out_data *hwdata = container_of(hw, struct vc5_out_data, hw);
 640         struct vc5_driver_data *vc5 = hwdata->vc5;
 641
 642         /* Disable the clock buffer */
 643         regmap_update_bits(vc5->regmap, VC5_CLK_OUTPUT_CFG(hwdata->num, 1),
 644                            VC5_CLK_OUTPUT_CFG1_EN_CLKBUF, 0);
 645 }
 646
 647 static unsigned char vc5_clk_out_get_parent(struct clk_hw *hw)
 648 {
 649         struct vc5_out_data *hwdata = container_of(hw, struct vc5_out_data, hw);
 650         struct vc5_driver_data *vc5 = hwdata->vc5;
 651         const u8 mask = VC5_OUT_DIV_CONTROL_SELB_NORM |
 652                         VC5_OUT_DIV_CONTROL_SEL_EXT |
 653                         VC5_OUT_DIV_CONTROL_EN_FOD;
 654         const u8 fodclkmask = VC5_OUT_DIV_CONTROL_SELB_NORM |
 655                               VC5_OUT_DIV_CONTROL_EN_FOD;
 656         const u8 extclk = VC5_OUT_DIV_CONTROL_SELB_NORM |
 657                           VC5_OUT_DIV_CONTROL_SEL_EXT;
 658         unsigned int src;
 659
 660         regmap_read(vc5->regmap, VC5_OUT_DIV_CONTROL(hwdata->num), &src);
 661         src &= mask;
 662
 663         if (src == 0)   /* Input mux set to DISABLED */
 664                 return 0;
 665
 666         if ((src & fodclkmask) == VC5_OUT_DIV_CONTROL_EN_FOD)
 667                 return 0;
 668
 669         if (src == extclk)
 670                 return 1;
 671
 672         dev_warn(&vc5->client->dev,
 673                  "Invalid clock output configuration (%02x)\n", src);
 674         return 0;
 675 }
 676
 677 static int vc5_clk_out_set_parent(struct clk_hw *hw, u8 index)
 678 {
 679         struct vc5_out_data *hwdata = container_of(hw, struct vc5_out_data, hw);
 680         struct vc5_driver_data *vc5 = hwdata->vc5;
 681         const u8 mask = VC5_OUT_DIV_CONTROL_RESET |
 682                         VC5_OUT_DIV_CONTROL_SELB_NORM |
 683                         VC5_OUT_DIV_CONTROL_SEL_EXT |
 684                         VC5_OUT_DIV_CONTROL_EN_FOD;
 685         const u8 extclk = VC5_OUT_DIV_CONTROL_SELB_NORM |
 686                           VC5_OUT_DIV_CONTROL_SEL_EXT;
 687         u8 src = VC5_OUT_DIV_CONTROL_RESET;
 688
 689         if (index == 0)
 690                 src |= VC5_OUT_DIV_CONTROL_EN_FOD;
 691         else
 692                 src |= extclk;
 693
 694         return regmap_update_bits(vc5->regmap, VC5_OUT_DIV_CONTROL(hwdata->num),
 695                                   mask, src);
 696 }
 697
 698 static const struct clk_ops vc5_clk_out_ops = {
 699         .prepare        = vc5_clk_out_prepare,
 700         .unprepare      = vc5_clk_out_unprepare,
 701         .set_parent     = vc5_clk_out_set_parent,
 702         .get_parent     = vc5_clk_out_get_parent,
 703 };
 704
 705 static struct clk_hw *vc5_of_clk_get(struct of_phandle_args *clkspec,
 706                                      void *data)
 707 {
 708         struct vc5_driver_data *vc5 = data;
 709         unsigned int idx = clkspec->args[0];
 710
 711         if (idx >= vc5->chip_info->clk_out_cnt)
 712                 return ERR_PTR(-EINVAL);
 713
 714         return &vc5->clk_out[idx].hw;
 715 }
 716
 717 static int vc5_map_index_to_output(const enum vc5_model model,
 718                                    const unsigned int n)
 719 {
 720         switch (model) {
 721         case IDT_VC5_5P49V5933:
 722                 return (n == 0) ? 0 : 3;
 723         case IDT_VC5_5P49V5923:
 724         case IDT_VC5_5P49V5925:
 725         case IDT_VC5_5P49V5935:
 726         case IDT_VC6_5P49V6901:
 727         case IDT_VC6_5P49V6965:
 728         default:
 729                 return n;
 730         }
 731 }
 732
 733 static int vc5_update_mode(struct device_node *np_output,
 734                            struct vc5_out_data *clk_out)
 735 {
 736         u32 value;
 737
 738         if (!of_property_read_u32(np_output, "idt,mode", &value)) {
 739                 clk_out->clk_output_cfg0_mask |= VC5_CLK_OUTPUT_CFG0_CFG_MASK;
 740                 switch (value) {
 741                 case VC5_CLK_OUTPUT_CFG0_CFG_LVPECL:
 742                 case VC5_CLK_OUTPUT_CFG0_CFG_CMOS:
 743                 case VC5_CLK_OUTPUT_CFG0_CFG_HCSL33:
 744                 case VC5_CLK_OUTPUT_CFG0_CFG_LVDS:
 745                 case VC5_CLK_OUTPUT_CFG0_CFG_CMOS2:
 746                 case VC5_CLK_OUTPUT_CFG0_CFG_CMOSD:
 747                 case VC5_CLK_OUTPUT_CFG0_CFG_HCSL25:
 748                         clk_out->clk_output_cfg0 |=
 749                             value << VC5_CLK_OUTPUT_CFG0_CFG_SHIFT;
 750                         break;
 751                 default:
 752                         return -EINVAL;
 753                 }
 754         }
 755         return 0;
 756 }
 757
 758 static int vc5_update_power(struct device_node *np_output,
 759                             struct vc5_out_data *clk_out)
 760 {
 761         u32 value;
 762
 763         if (!of_property_read_u32(np_output, "idt,voltage-microvolt",
 764                                   &value)) {
 765                 clk_out->clk_output_cfg0_mask |= VC5_CLK_OUTPUT_CFG0_PWR_MASK;
 766                 switch (value) {
 767                 case 1800000:
 768                         clk_out->clk_output_cfg0 |= VC5_CLK_OUTPUT_CFG0_PWR_18;
 769                         break;
 770                 case 2500000:
 771                         clk_out->clk_output_cfg0 |= VC5_CLK_OUTPUT_CFG0_PWR_25;
 772                         break;
 773                 case 3300000:
 774                         clk_out->clk_output_cfg0 |= VC5_CLK_OUTPUT_CFG0_PWR_33;
 775                         break;
 776                 default:
 777                         return -EINVAL;
 778                 }
 779         }
 780         return 0;
 781 }
 782
 783 static int vc5_update_slew(struct device_node *np_output,
 784                            struct vc5_out_data *clk_out)
 785 {
 786         u32 value;
 787
 788         if (!of_property_read_u32(np_output, "idt,slew-percent", &value)) {
 789                 clk_out->clk_output_cfg0_mask |= VC5_CLK_OUTPUT_CFG0_SLEW_MASK;
 790                 switch (value) {
 791                 case 80:
 792                         clk_out->clk_output_cfg0 |= VC5_CLK_OUTPUT_CFG0_SLEW_80;
 793                         break;
 794                 case 85:
 795                         clk_out->clk_output_cfg0 |= VC5_CLK_OUTPUT_CFG0_SLEW_85;
 796                         break;
 797                 case 90:
 798                         clk_out->clk_output_cfg0 |= VC5_CLK_OUTPUT_CFG0_SLEW_90;
 799                         break;
 800                 case 100:
 801                         clk_out->clk_output_cfg0 |=
 802                             VC5_CLK_OUTPUT_CFG0_SLEW_100;
 803                         break;
 804                 default:
 805                         return -EINVAL;
 806                 }
 807         }
 808         return 0;
 809 }
 810
 811 static int vc5_get_output_config(struct i2c_client *client,
 812                                  struct vc5_out_data *clk_out)
 813 {
 814         struct device_node *np_output;
 815         char *child_name;
 816         int ret = 0;
 817
 818         child_name = kasprintf(GFP_KERNEL, "OUT%d", clk_out->num + 1);
 819         if (!child_name)
 820                 return -ENOMEM;
 821
 822         np_output = of_get_child_by_name(client->dev.of_node, child_name);
 823         kfree(child_name);
 824         if (!np_output)
 825                 return 0;
 826
 827         ret = vc5_update_mode(np_output, clk_out);
 828         if (ret)
 829                 goto output_error;
 830
 831         ret = vc5_update_power(np_output, clk_out);
 832         if (ret)
 833                 goto output_error;
 834
 835         ret = vc5_update_slew(np_output, clk_out);
 836
 837 output_error:
 838         if (ret) {
 839                 dev_err(&client->dev,
 840                         "Invalid clock output configuration OUT%d\n",
 841                         clk_out->num + 1);
 842         }
 843
 844         of_node_put(np_output);
 845
 846         return ret;
 847 }
 848
 849 static const struct of_device_id clk_vc5_of_match[];
 850
 851 static int vc5_probe(struct i2c_client *client, const struct i2c_device_id *id)
 852 {
 853         struct vc5_driver_data *vc5;
 854         struct clk_init_data init;
 855         const char *parent_names[2];
 856         unsigned int n, idx = 0;
 857         int ret;
 858
 859         vc5 = devm_kzalloc(&client->dev, sizeof(*vc5), GFP_KERNEL);
 860         if (!vc5)
 861                 return -ENOMEM;
 862
 863         i2c_set_clientdata(client, vc5);
 864         vc5->client = client;
 865         vc5->chip_info = of_device_get_match_data(&client->dev);
 866
 867         vc5->pin_xin = devm_clk_get(&client->dev, "xin");
 868         if (PTR_ERR(vc5->pin_xin) == -EPROBE_DEFER)
 869                 return -EPROBE_DEFER;
 870
 871         vc5->pin_clkin = devm_clk_get(&client->dev, "clkin");
 872         if (PTR_ERR(vc5->pin_clkin) == -EPROBE_DEFER)
 873                 return -EPROBE_DEFER;
 874
 875         vc5->regmap = devm_regmap_init_i2c(client, &vc5_regmap_config);
 876         if (IS_ERR(vc5->regmap)) {
 877                 dev_err(&client->dev, "failed to allocate register map\n");
 878                 return PTR_ERR(vc5->regmap);
 879         }
 880
 881         /* Register clock input mux */
 882         memset(&init, 0, sizeof(init));
 883
 884         if (!IS_ERR(vc5->pin_xin)) {
 885                 vc5->clk_mux_ins |= VC5_MUX_IN_XIN;
 886                 parent_names[init.num_parents++] = __clk_get_name(vc5->pin_xin);
 887         } else if (vc5->chip_info->flags & VC5_HAS_INTERNAL_XTAL) {
 888                 vc5->pin_xin = clk_register_fixed_rate(&client->dev,
 889                                                        "internal-xtal", NULL,
 890                                                        0, 25000000);
 891                 if (IS_ERR(vc5->pin_xin))
 892                         return PTR_ERR(vc5->pin_xin);
 893                 vc5->clk_mux_ins |= VC5_MUX_IN_XIN;
 894                 parent_names[init.num_parents++] = __clk_get_name(vc5->pin_xin);
 895         }
 896
 897         if (!IS_ERR(vc5->pin_clkin)) {
 898                 vc5->clk_mux_ins |= VC5_MUX_IN_CLKIN;
 899                 parent_names[init.num_parents++] =
 900                     __clk_get_name(vc5->pin_clkin);
 901         }
 902
 903         if (!init.num_parents) {
 904                 dev_err(&client->dev, "no input clock specified!\n");
 905                 return -EINVAL;
 906         }
 907
 908         init.name = kasprintf(GFP_KERNEL, "%pOFn.mux", client->dev.of_node);
 909         if (!init.name) {
 910                 ret = -ENOMEM;
 911                 goto err_clk;
 912         }
 913
 914         init.ops = &vc5_mux_ops;
 915         init.flags = 0;
 916         init.parent_names = parent_names;
 917         vc5->clk_mux.init = &init;
 918         ret = devm_clk_hw_register(&client->dev, &vc5->clk_mux);
 919         if (ret)
 920                 goto err_clk_register;
 921         kfree(init.name);       /* clock framework made a copy of the name */
 922
 923         if (vc5->chip_info->flags & VC5_HAS_PFD_FREQ_DBL) {
 924                 /* Register frequency doubler */
 925                 memset(&init, 0, sizeof(init));
 926                 init.name = kasprintf(GFP_KERNEL, "%pOFn.dbl",
 927                                       client->dev.of_node);
 928                 if (!init.name) {
 929                         ret = -ENOMEM;
 930                         goto err_clk;
 931                 }
 932                 init.ops = &vc5_dbl_ops;
 933                 init.flags = CLK_SET_RATE_PARENT;
 934                 init.parent_names = parent_names;
 935                 parent_names[0] = clk_hw_get_name(&vc5->clk_mux);
 936                 init.num_parents = 1;
 937                 vc5->clk_mul.init = &init;
 938                 ret = devm_clk_hw_register(&client->dev, &vc5->clk_mul);
 939                 if (ret)
 940                         goto err_clk_register;
 941                 kfree(init.name); /* clock framework made a copy of the name */
 942         }
 943
 944         /* Register PFD */
 945         memset(&init, 0, sizeof(init));
 946         init.name = kasprintf(GFP_KERNEL, "%pOFn.pfd", client->dev.of_node);
 947         if (!init.name) {
 948                 ret = -ENOMEM;
 949                 goto err_clk;
 950         }
 951         init.ops = &vc5_pfd_ops;
 952         init.flags = CLK_SET_RATE_PARENT;
 953         init.parent_names = parent_names;
 954         if (vc5->chip_info->flags & VC5_HAS_PFD_FREQ_DBL)
 955                 parent_names[0] = clk_hw_get_name(&vc5->clk_mul);
 956         else
 957                 parent_names[0] = clk_hw_get_name(&vc5->clk_mux);
 958         init.num_parents = 1;
 959         vc5->clk_pfd.init = &init;
 960         ret = devm_clk_hw_register(&client->dev, &vc5->clk_pfd);
 961         if (ret)
 962                 goto err_clk_register;
 963         kfree(init.name);       /* clock framework made a copy of the name */
 964
 965         /* Register PLL */
 966         memset(&init, 0, sizeof(init));
 967         init.name = kasprintf(GFP_KERNEL, "%pOFn.pll", client->dev.of_node);
 968         if (!init.name) {
 969                 ret = -ENOMEM;
 970                 goto err_clk;
 971         }
 972         init.ops = &vc5_pll_ops;
 973         init.flags = CLK_SET_RATE_PARENT;
 974         init.parent_names = parent_names;
 975         parent_names[0] = clk_hw_get_name(&vc5->clk_pfd);
 976         init.num_parents = 1;
 977         vc5->clk_pll.num = 0;
 978         vc5->clk_pll.vc5 = vc5;
 979         vc5->clk_pll.hw.init = &init;
 980         ret = devm_clk_hw_register(&client->dev, &vc5->clk_pll.hw);
 981         if (ret)
 982                 goto err_clk_register;
 983         kfree(init.name); /* clock framework made a copy of the name */
 984
 985         /* Register FODs */
 986         for (n = 0; n < vc5->chip_info->clk_fod_cnt; n++) {
 987                 idx = vc5_map_index_to_output(vc5->chip_info->model, n);
 988                 memset(&init, 0, sizeof(init));
 989                 init.name = kasprintf(GFP_KERNEL, "%pOFn.fod%d",
 990                                       client->dev.of_node, idx);
 991                 if (!init.name) {
 992                         ret = -ENOMEM;
 993                         goto err_clk;
 994                 }
 995                 init.ops = &vc5_fod_ops;
 996                 init.flags = CLK_SET_RATE_PARENT;
 997                 init.parent_names = parent_names;
 998                 parent_names[0] = clk_hw_get_name(&vc5->clk_pll.hw);
 999                 init.num_parents = 1;
1000                 vc5->clk_fod[n].num = idx;
1001                 vc5->clk_fod[n].vc5 = vc5;
1002                 vc5->clk_fod[n].hw.init = &init;
1003                 ret = devm_clk_hw_register(&client->dev, &vc5->clk_fod[n].hw);
1004                 if (ret)
1005                         goto err_clk_register;
1006                 kfree(init.name); /* clock framework made a copy of the name */
1007         }
1008
1009         /* Register MUX-connected OUT0_I2C_SELB output */
1010         memset(&init, 0, sizeof(init));
1011         init.name = kasprintf(GFP_KERNEL, "%pOFn.out0_sel_i2cb",
1012                               client->dev.of_node);
1013         if (!init.name) {
1014                 ret = -ENOMEM;
1015                 goto err_clk;
1016         }
1017         init.ops = &vc5_clk_out_ops;
1018         init.flags = CLK_SET_RATE_PARENT;
1019         init.parent_names = parent_names;
1020         parent_names[0] = clk_hw_get_name(&vc5->clk_mux);
1021         init.num_parents = 1;
1022         vc5->clk_out[0].num = idx;
1023         vc5->clk_out[0].vc5 = vc5;
1024         vc5->clk_out[0].hw.init = &init;
1025         ret = devm_clk_hw_register(&client->dev, &vc5->clk_out[0].hw);
1026         if (ret)
1027                 goto err_clk_register;
1028         kfree(init.name); /* clock framework made a copy of the name */
1029
1030         /* Register FOD-connected OUTx outputs */
1031         for (n = 1; n < vc5->chip_info->clk_out_cnt; n++) {
1032                 idx = vc5_map_index_to_output(vc5->chip_info->model, n - 1);
1033                 parent_names[0] = clk_hw_get_name(&vc5->clk_fod[idx].hw);
1034                 if (n == 1)
1035                         parent_names[1] = clk_hw_get_name(&vc5->clk_mux);
1036                 else
1037                         parent_names[1] =
1038                             clk_hw_get_name(&vc5->clk_out[n - 1].hw);
1039
1040                 memset(&init, 0, sizeof(init));
1041                 init.name = kasprintf(GFP_KERNEL, "%pOFn.out%d",
1042                                       client->dev.of_node, idx + 1);
1043                 if (!init.name) {
1044                         ret = -ENOMEM;
1045                         goto err_clk;
1046                 }
1047                 init.ops = &vc5_clk_out_ops;
1048                 init.flags = CLK_SET_RATE_PARENT;
1049                 init.parent_names = parent_names;
1050                 init.num_parents = 2;
1051                 vc5->clk_out[n].num = idx;
1052                 vc5->clk_out[n].vc5 = vc5;
1053                 vc5->clk_out[n].hw.init = &init;
1054                 ret = devm_clk_hw_register(&client->dev, &vc5->clk_out[n].hw);
1055                 if (ret)
1056                         goto err_clk_register;
1057                 kfree(init.name); /* clock framework made a copy of the name */
1058
1059                 /* Fetch Clock Output configuration from DT (if specified) */
1060                 ret = vc5_get_output_config(client, &vc5->clk_out[n]);
1061                 if (ret)
1062                         goto err_clk;
1063         }
1064
1065         ret = of_clk_add_hw_provider(client->dev.of_node, vc5_of_clk_get, vc5);
1066         if (ret) {
1067                 dev_err(&client->dev, "unable to add clk provider\n");
1068                 goto err_clk;
1069         }
1070
1071         return 0;
1072
1073 err_clk_register:
1074         dev_err(&client->dev, "unable to register %s\n", init.name);
1075         kfree(init.name); /* clock framework made a copy of the name */
1076 err_clk:
1077         if (vc5->chip_info->flags & VC5_HAS_INTERNAL_XTAL)
1078                 clk_unregister_fixed_rate(vc5->pin_xin);
1079         return ret;
1080 }
1081
1082 static int vc5_remove(struct i2c_client *client)
1083 {
1084         struct vc5_driver_data *vc5 = i2c_get_clientdata(client);
1085
1086         of_clk_del_provider(client->dev.of_node);
1087
1088         if (vc5->chip_info->flags & VC5_HAS_INTERNAL_XTAL)
1089                 clk_unregister_fixed_rate(vc5->pin_xin);
1090
1091         return 0;
1092 }
1093
1094 static int __maybe_unused vc5_suspend(struct device *dev)
1095 {
1096         struct vc5_driver_data *vc5 = dev_get_drvdata(dev);
1097
1098         regcache_cache_only(vc5->regmap, true);
1099         regcache_mark_dirty(vc5->regmap);
1100
1101         return 0;
1102 }
1103
1104 static int __maybe_unused vc5_resume(struct device *dev)
1105 {
1106         struct vc5_driver_data *vc5 = dev_get_drvdata(dev);
1107         int ret;
1108
1109         regcache_cache_only(vc5->regmap, false);
1110         ret = regcache_sync(vc5->regmap);
1111         if (ret)
1112                 dev_err(dev, "Failed to restore register map: %d\n", ret);
1113         return ret;
1114 }
1115
1116 static const struct vc5_chip_info idt_5p49v5923_info = {
1117         .model = IDT_VC5_5P49V5923,
1118         .clk_fod_cnt = 2,
1119         .clk_out_cnt = 3,
1120         .flags = 0,
1121 };
1122
1123 static const struct vc5_chip_info idt_5p49v5925_info = {
1124         .model = IDT_VC5_5P49V5925,
1125         .clk_fod_cnt = 4,
1126         .clk_out_cnt = 5,
1127         .flags = 0,
1128 };
1129
1130 static const struct vc5_chip_info idt_5p49v5933_info = {
1131         .model = IDT_VC5_5P49V5933,
1132         .clk_fod_cnt = 2,
1133         .clk_out_cnt = 3,
1134         .flags = VC5_HAS_INTERNAL_XTAL,
1135 };
1136
1137 static const struct vc5_chip_info idt_5p49v5935_info = {
1138         .model = IDT_VC5_5P49V5935,
1139         .clk_fod_cnt = 4,
1140         .clk_out_cnt = 5,
1141         .flags = VC5_HAS_INTERNAL_XTAL,
1142 };
1143
1144 static const struct vc5_chip_info idt_5p49v6901_info = {
1145         .model = IDT_VC6_5P49V6901,
1146         .clk_fod_cnt = 4,
1147         .clk_out_cnt = 5,
1148         .flags = VC5_HAS_PFD_FREQ_DBL | VC5_HAS_BYPASS_SYNC_BIT,
1149 };
1150
1151 static const struct vc5_chip_info idt_5p49v6965_info = {
1152         .model = IDT_VC6_5P49V6965,
1153         .clk_fod_cnt = 4,
1154         .clk_out_cnt = 5,
1155         .flags = VC5_HAS_BYPASS_SYNC_BIT,
1156 };
1157
1158 static const struct i2c_device_id vc5_id[] = {
1159         { "5p49v5923", .driver_data = IDT_VC5_5P49V5923 },
1160         { "5p49v5925", .driver_data = IDT_VC5_5P49V5925 },
1161         { "5p49v5933", .driver_data = IDT_VC5_5P49V5933 },
1162         { "5p49v5935", .driver_data = IDT_VC5_5P49V5935 },
1163         { "5p49v6901", .driver_data = IDT_VC6_5P49V6901 },
1164         { "5p49v6965", .driver_data = IDT_VC6_5P49V6965 },
1165         { }
1166 };
1167 MODULE_DEVICE_TABLE(i2c, vc5_id);
1168
1169 static const struct of_device_id clk_vc5_of_match[] = {
1170         { .compatible = "idt,5p49v5923", .data = &idt_5p49v5923_info },
1171         { .compatible = "idt,5p49v5925", .data = &idt_5p49v5925_info },
1172         { .compatible = "idt,5p49v5933", .data = &idt_5p49v5933_info },
1173         { .compatible = "idt,5p49v5935", .data = &idt_5p49v5935_info },
1174         { .compatible = "idt,5p49v6901", .data = &idt_5p49v6901_info },
1175         { .compatible = "idt,5p49v6965", .data = &idt_5p49v6965_info },
1176         { },
1177 };
1178 MODULE_DEVICE_TABLE(of, clk_vc5_of_match);
1179
1180 static SIMPLE_DEV_PM_OPS(vc5_pm_ops, vc5_suspend, vc5_resume);
1181
1182 static struct i2c_driver vc5_driver = {
1183         .driver = {
1184                 .name = "vc5",
1185                 .pm     = &vc5_pm_ops,
1186                 .of_match_table = clk_vc5_of_match,
1187         },
1188         .probe          = vc5_probe,
1189         .remove         = vc5_remove,
1190         .id_table       = vc5_id,
1191 };
1192 module_i2c_driver(vc5_driver);
1193
1194 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
1195 MODULE_DESCRIPTION("IDT VersaClock 5 driver");
1196 MODULE_LICENSE("GPL");