drivers/clk/meson/gxbb.c

   1 /*
   2  * AmLogic S905 / GXBB Clock Controller Driver
   3  *
   4  * Copyright (c) 2016 AmLogic, Inc.
   5  * Michael Turquette <mturquette@baylibre.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms and conditions of the GNU General Public License,
   9  * version 2, as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <linux/clk.h>
  21 #include <linux/clk-provider.h>
  22 #include <linux/of_address.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/init.h>
  25
  26 #include "clkc.h"
  27 #include "gxbb.h"
  28
  29 static DEFINE_SPINLOCK(clk_lock);
  30
  31 static const struct pll_rate_table sys_pll_rate_table[] = {
  32         PLL_RATE(24000000, 56, 1, 2),
  33         PLL_RATE(48000000, 64, 1, 2),
  34         PLL_RATE(72000000, 72, 1, 2),
  35         PLL_RATE(96000000, 64, 1, 2),
  36         PLL_RATE(120000000, 80, 1, 2),
  37         PLL_RATE(144000000, 96, 1, 2),
  38         PLL_RATE(168000000, 56, 1, 1),
  39         PLL_RATE(192000000, 64, 1, 1),
  40         PLL_RATE(216000000, 72, 1, 1),
  41         PLL_RATE(240000000, 80, 1, 1),
  42         PLL_RATE(264000000, 88, 1, 1),
  43         PLL_RATE(288000000, 96, 1, 1),
  44         PLL_RATE(312000000, 52, 1, 2),
  45         PLL_RATE(336000000, 56, 1, 2),
  46         PLL_RATE(360000000, 60, 1, 2),
  47         PLL_RATE(384000000, 64, 1, 2),
  48         PLL_RATE(408000000, 68, 1, 2),
  49         PLL_RATE(432000000, 72, 1, 2),
  50         PLL_RATE(456000000, 76, 1, 2),
  51         PLL_RATE(480000000, 80, 1, 2),
  52         PLL_RATE(504000000, 84, 1, 2),
  53         PLL_RATE(528000000, 88, 1, 2),
  54         PLL_RATE(552000000, 92, 1, 2),
  55         PLL_RATE(576000000, 96, 1, 2),
  56         PLL_RATE(600000000, 50, 1, 1),
  57         PLL_RATE(624000000, 52, 1, 1),
  58         PLL_RATE(648000000, 54, 1, 1),
  59         PLL_RATE(672000000, 56, 1, 1),
  60         PLL_RATE(696000000, 58, 1, 1),
  61         PLL_RATE(720000000, 60, 1, 1),
  62         PLL_RATE(744000000, 62, 1, 1),
  63         PLL_RATE(768000000, 64, 1, 1),
  64         PLL_RATE(792000000, 66, 1, 1),
  65         PLL_RATE(816000000, 68, 1, 1),
  66         PLL_RATE(840000000, 70, 1, 1),
  67         PLL_RATE(864000000, 72, 1, 1),
  68         PLL_RATE(888000000, 74, 1, 1),
  69         PLL_RATE(912000000, 76, 1, 1),
  70         PLL_RATE(936000000, 78, 1, 1),
  71         PLL_RATE(960000000, 80, 1, 1),
  72         PLL_RATE(984000000, 82, 1, 1),
  73         PLL_RATE(1008000000, 84, 1, 1),
  74         PLL_RATE(1032000000, 86, 1, 1),
  75         PLL_RATE(1056000000, 88, 1, 1),
  76         PLL_RATE(1080000000, 90, 1, 1),
  77         PLL_RATE(1104000000, 92, 1, 1),
  78         PLL_RATE(1128000000, 94, 1, 1),
  79         PLL_RATE(1152000000, 96, 1, 1),
  80         PLL_RATE(1176000000, 98, 1, 1),
  81         PLL_RATE(1200000000, 50, 1, 0),
  82         PLL_RATE(1224000000, 51, 1, 0),
  83         PLL_RATE(1248000000, 52, 1, 0),
  84         PLL_RATE(1272000000, 53, 1, 0),
  85         PLL_RATE(1296000000, 54, 1, 0),
  86         PLL_RATE(1320000000, 55, 1, 0),
  87         PLL_RATE(1344000000, 56, 1, 0),
  88         PLL_RATE(1368000000, 57, 1, 0),
  89         PLL_RATE(1392000000, 58, 1, 0),
  90         PLL_RATE(1416000000, 59, 1, 0),
  91         PLL_RATE(1440000000, 60, 1, 0),
  92         PLL_RATE(1464000000, 61, 1, 0),
  93         PLL_RATE(1488000000, 62, 1, 0),
  94         PLL_RATE(1512000000, 63, 1, 0),
  95         PLL_RATE(1536000000, 64, 1, 0),
  96         PLL_RATE(1560000000, 65, 1, 0),
  97         PLL_RATE(1584000000, 66, 1, 0),
  98         PLL_RATE(1608000000, 67, 1, 0),
  99         PLL_RATE(1632000000, 68, 1, 0),
 100         PLL_RATE(1656000000, 68, 1, 0),
 101         PLL_RATE(1680000000, 68, 1, 0),
 102         PLL_RATE(1704000000, 68, 1, 0),
 103         PLL_RATE(1728000000, 69, 1, 0),
 104         PLL_RATE(1752000000, 69, 1, 0),
 105         PLL_RATE(1776000000, 69, 1, 0),
 106         PLL_RATE(1800000000, 69, 1, 0),
 107         PLL_RATE(1824000000, 70, 1, 0),
 108         PLL_RATE(1848000000, 70, 1, 0),
 109         PLL_RATE(1872000000, 70, 1, 0),
 110         PLL_RATE(1896000000, 70, 1, 0),
 111         PLL_RATE(1920000000, 71, 1, 0),
 112         PLL_RATE(1944000000, 71, 1, 0),
 113         PLL_RATE(1968000000, 71, 1, 0),
 114         PLL_RATE(1992000000, 71, 1, 0),
 115         PLL_RATE(2016000000, 72, 1, 0),
 116         PLL_RATE(2040000000, 72, 1, 0),
 117         PLL_RATE(2064000000, 72, 1, 0),
 118         PLL_RATE(2088000000, 72, 1, 0),
 119         PLL_RATE(2112000000, 73, 1, 0),
 120         { /* sentinel */ },
 121 };
 122
 123 static const struct pll_rate_table gp0_pll_rate_table[] = {
 124         PLL_RATE(96000000, 32, 1, 3),
 125         PLL_RATE(99000000, 33, 1, 3),
 126         PLL_RATE(102000000, 34, 1, 3),
 127         PLL_RATE(105000000, 35, 1, 3),
 128         PLL_RATE(108000000, 36, 1, 3),
 129         PLL_RATE(111000000, 37, 1, 3),
 130         PLL_RATE(114000000, 38, 1, 3),
 131         PLL_RATE(117000000, 39, 1, 3),
 132         PLL_RATE(120000000, 40, 1, 3),
 133         PLL_RATE(123000000, 41, 1, 3),
 134         PLL_RATE(126000000, 42, 1, 3),
 135         PLL_RATE(129000000, 43, 1, 3),
 136         PLL_RATE(132000000, 44, 1, 3),
 137         PLL_RATE(135000000, 45, 1, 3),
 138         PLL_RATE(138000000, 46, 1, 3),
 139         PLL_RATE(141000000, 47, 1, 3),
 140         PLL_RATE(144000000, 48, 1, 3),
 141         PLL_RATE(147000000, 49, 1, 3),
 142         PLL_RATE(150000000, 50, 1, 3),
 143         PLL_RATE(153000000, 51, 1, 3),
 144         PLL_RATE(156000000, 52, 1, 3),
 145         PLL_RATE(159000000, 53, 1, 3),
 146         PLL_RATE(162000000, 54, 1, 3),
 147         PLL_RATE(165000000, 55, 1, 3),
 148         PLL_RATE(168000000, 56, 1, 3),
 149         PLL_RATE(171000000, 57, 1, 3),
 150         PLL_RATE(174000000, 58, 1, 3),
 151         PLL_RATE(177000000, 59, 1, 3),
 152         PLL_RATE(180000000, 60, 1, 3),
 153         PLL_RATE(183000000, 61, 1, 3),
 154         PLL_RATE(186000000, 62, 1, 3),
 155         PLL_RATE(192000000, 32, 1, 2),
 156         PLL_RATE(198000000, 33, 1, 2),
 157         PLL_RATE(204000000, 34, 1, 2),
 158         PLL_RATE(210000000, 35, 1, 2),
 159         PLL_RATE(216000000, 36, 1, 2),
 160         PLL_RATE(222000000, 37, 1, 2),
 161         PLL_RATE(228000000, 38, 1, 2),
 162         PLL_RATE(234000000, 39, 1, 2),
 163         PLL_RATE(240000000, 40, 1, 2),
 164         PLL_RATE(246000000, 41, 1, 2),
 165         PLL_RATE(252000000, 42, 1, 2),
 166         PLL_RATE(258000000, 43, 1, 2),
 167         PLL_RATE(264000000, 44, 1, 2),
 168         PLL_RATE(270000000, 45, 1, 2),
 169         PLL_RATE(276000000, 46, 1, 2),
 170         PLL_RATE(282000000, 47, 1, 2),
 171         PLL_RATE(288000000, 48, 1, 2),
 172         PLL_RATE(294000000, 49, 1, 2),
 173         PLL_RATE(300000000, 50, 1, 2),
 174         PLL_RATE(306000000, 51, 1, 2),
 175         PLL_RATE(312000000, 52, 1, 2),
 176         PLL_RATE(318000000, 53, 1, 2),
 177         PLL_RATE(324000000, 54, 1, 2),
 178         PLL_RATE(330000000, 55, 1, 2),
 179         PLL_RATE(336000000, 56, 1, 2),
 180         PLL_RATE(342000000, 57, 1, 2),
 181         PLL_RATE(348000000, 58, 1, 2),
 182         PLL_RATE(354000000, 59, 1, 2),
 183         PLL_RATE(360000000, 60, 1, 2),
 184         PLL_RATE(366000000, 61, 1, 2),
 185         PLL_RATE(372000000, 62, 1, 2),
 186         PLL_RATE(384000000, 32, 1, 1),
 187         PLL_RATE(396000000, 33, 1, 1),
 188         PLL_RATE(408000000, 34, 1, 1),
 189         PLL_RATE(420000000, 35, 1, 1),
 190         PLL_RATE(432000000, 36, 1, 1),
 191         PLL_RATE(444000000, 37, 1, 1),
 192         PLL_RATE(456000000, 38, 1, 1),
 193         PLL_RATE(468000000, 39, 1, 1),
 194         PLL_RATE(480000000, 40, 1, 1),
 195         PLL_RATE(492000000, 41, 1, 1),
 196         PLL_RATE(504000000, 42, 1, 1),
 197         PLL_RATE(516000000, 43, 1, 1),
 198         PLL_RATE(528000000, 44, 1, 1),
 199         PLL_RATE(540000000, 45, 1, 1),
 200         PLL_RATE(552000000, 46, 1, 1),
 201         PLL_RATE(564000000, 47, 1, 1),
 202         PLL_RATE(576000000, 48, 1, 1),
 203         PLL_RATE(588000000, 49, 1, 1),
 204         PLL_RATE(600000000, 50, 1, 1),
 205         PLL_RATE(612000000, 51, 1, 1),
 206         PLL_RATE(624000000, 52, 1, 1),
 207         PLL_RATE(636000000, 53, 1, 1),
 208         PLL_RATE(648000000, 54, 1, 1),
 209         PLL_RATE(660000000, 55, 1, 1),
 210         PLL_RATE(672000000, 56, 1, 1),
 211         PLL_RATE(684000000, 57, 1, 1),
 212         PLL_RATE(696000000, 58, 1, 1),
 213         PLL_RATE(708000000, 59, 1, 1),
 214         PLL_RATE(720000000, 60, 1, 1),
 215         PLL_RATE(732000000, 61, 1, 1),
 216         PLL_RATE(744000000, 62, 1, 1),
 217         PLL_RATE(768000000, 32, 1, 0),
 218         PLL_RATE(792000000, 33, 1, 0),
 219         PLL_RATE(816000000, 34, 1, 0),
 220         PLL_RATE(840000000, 35, 1, 0),
 221         PLL_RATE(864000000, 36, 1, 0),
 222         PLL_RATE(888000000, 37, 1, 0),
 223         PLL_RATE(912000000, 38, 1, 0),
 224         PLL_RATE(936000000, 39, 1, 0),
 225         PLL_RATE(960000000, 40, 1, 0),
 226         PLL_RATE(984000000, 41, 1, 0),
 227         PLL_RATE(1008000000, 42, 1, 0),
 228         PLL_RATE(1032000000, 43, 1, 0),
 229         PLL_RATE(1056000000, 44, 1, 0),
 230         PLL_RATE(1080000000, 45, 1, 0),
 231         PLL_RATE(1104000000, 46, 1, 0),
 232         PLL_RATE(1128000000, 47, 1, 0),
 233         PLL_RATE(1152000000, 48, 1, 0),
 234         PLL_RATE(1176000000, 49, 1, 0),
 235         PLL_RATE(1200000000, 50, 1, 0),
 236         PLL_RATE(1224000000, 51, 1, 0),
 237         PLL_RATE(1248000000, 52, 1, 0),
 238         PLL_RATE(1272000000, 53, 1, 0),
 239         PLL_RATE(1296000000, 54, 1, 0),
 240         PLL_RATE(1320000000, 55, 1, 0),
 241         PLL_RATE(1344000000, 56, 1, 0),
 242         PLL_RATE(1368000000, 57, 1, 0),
 243         PLL_RATE(1392000000, 58, 1, 0),
 244         PLL_RATE(1416000000, 59, 1, 0),
 245         PLL_RATE(1440000000, 60, 1, 0),
 246         PLL_RATE(1464000000, 61, 1, 0),
 247         PLL_RATE(1488000000, 62, 1, 0),
 248         { /* sentinel */ },
 249 };
 250
 251 static const struct clk_div_table cpu_div_table[] = {
 252         { .val = 1, .div = 1 },
 253         { .val = 2, .div = 2 },
 254         { .val = 3, .div = 3 },
 255         { .val = 2, .div = 4 },
 256         { .val = 3, .div = 6 },
 257         { .val = 4, .div = 8 },
 258         { .val = 5, .div = 10 },
 259         { .val = 6, .div = 12 },
 260         { .val = 7, .div = 14 },
 261         { .val = 8, .div = 16 },
 262         { /* sentinel */ },
 263 };
 264
 265 static struct meson_clk_pll gxbb_fixed_pll = {
 266         .m = {
 267                 .reg_off = HHI_MPLL_CNTL,
 268                 .shift   = 0,
 269                 .width   = 9,
 270         },
 271         .n = {
 272                 .reg_off = HHI_MPLL_CNTL,
 273                 .shift   = 9,
 274                 .width   = 5,
 275         },
 276         .od = {
 277                 .reg_off = HHI_MPLL_CNTL,
 278                 .shift   = 16,
 279                 .width   = 2,
 280         },
 281         .lock = &clk_lock,
 282         .hw.init = &(struct clk_init_data){
 283                 .name = "fixed_pll",
 284                 .ops = &meson_clk_pll_ro_ops,
 285                 .parent_names = (const char *[]){ "xtal" },
 286                 .num_parents = 1,
 287                 .flags = CLK_GET_RATE_NOCACHE,
 288         },
 289 };
 290
 291 static struct meson_clk_pll gxbb_hdmi_pll = {
 292         .m = {
 293                 .reg_off = HHI_HDMI_PLL_CNTL,
 294                 .shift   = 0,
 295                 .width   = 9,
 296         },
 297         .n = {
 298                 .reg_off = HHI_HDMI_PLL_CNTL,
 299                 .shift   = 9,
 300                 .width   = 5,
 301         },
 302         .frac = {
 303                 .reg_off = HHI_HDMI_PLL_CNTL2,
 304                 .shift   = 0,
 305                 .width   = 12,
 306         },
 307         .od = {
 308                 .reg_off = HHI_HDMI_PLL_CNTL2,
 309                 .shift   = 16,
 310                 .width   = 2,
 311         },
 312         .od2 = {
 313                 .reg_off = HHI_HDMI_PLL_CNTL2,
 314                 .shift   = 22,
 315                 .width   = 2,
 316         },
 317         .lock = &clk_lock,
 318         .hw.init = &(struct clk_init_data){
 319                 .name = "hdmi_pll",
 320                 .ops = &meson_clk_pll_ro_ops,
 321                 .parent_names = (const char *[]){ "xtal" },
 322                 .num_parents = 1,
 323                 .flags = CLK_GET_RATE_NOCACHE,
 324         },
 325 };
 326
 327 static struct meson_clk_pll gxbb_sys_pll = {
 328         .m = {
 329                 .reg_off = HHI_SYS_PLL_CNTL,
 330                 .shift   = 0,
 331                 .width   = 9,
 332         },
 333         .n = {
 334                 .reg_off = HHI_SYS_PLL_CNTL,
 335                 .shift   = 9,
 336                 .width   = 5,
 337         },
 338         .od = {
 339                 .reg_off = HHI_SYS_PLL_CNTL,
 340                 .shift   = 10,
 341                 .width   = 2,
 342         },
 343         .rate_table = sys_pll_rate_table,
 344         .rate_count = ARRAY_SIZE(sys_pll_rate_table),
 345         .lock = &clk_lock,
 346         .hw.init = &(struct clk_init_data){
 347                 .name = "sys_pll",
 348                 .ops = &meson_clk_pll_ro_ops,
 349                 .parent_names = (const char *[]){ "xtal" },
 350                 .num_parents = 1,
 351                 .flags = CLK_GET_RATE_NOCACHE,
 352         },
 353 };
 354
 355 static struct meson_clk_pll gxbb_gp0_pll = {
 356         .m = {
 357                 .reg_off = HHI_GP0_PLL_CNTL,
 358                 .shift   = 0,
 359                 .width   = 9,
 360         },
 361         .n = {
 362                 .reg_off = HHI_GP0_PLL_CNTL,
 363                 .shift   = 9,
 364                 .width   = 5,
 365         },
 366         .od = {
 367                 .reg_off = HHI_GP0_PLL_CNTL,
 368                 .shift   = 16,
 369                 .width   = 2,
 370         },
 371         .rate_table = gp0_pll_rate_table,
 372         .rate_count = ARRAY_SIZE(gp0_pll_rate_table),
 373         .lock = &clk_lock,
 374         .hw.init = &(struct clk_init_data){
 375                 .name = "gp0_pll",
 376                 .ops = &meson_clk_pll_ops,
 377                 .parent_names = (const char *[]){ "xtal" },
 378                 .num_parents = 1,
 379                 .flags = CLK_GET_RATE_NOCACHE,
 380         },
 381 };
 382
 383 static struct clk_fixed_factor gxbb_fclk_div2 = {
 384         .mult = 1,
 385         .div = 2,
 386         .hw.init = &(struct clk_init_data){
 387                 .name = "fclk_div2",
 388                 .ops = &clk_fixed_factor_ops,
 389                 .parent_names = (const char *[]){ "fixed_pll" },
 390                 .num_parents = 1,
 391         },
 392 };
 393
 394 static struct clk_fixed_factor gxbb_fclk_div3 = {
 395         .mult = 1,
 396         .div = 3,
 397         .hw.init = &(struct clk_init_data){
 398                 .name = "fclk_div3",
 399                 .ops = &clk_fixed_factor_ops,
 400                 .parent_names = (const char *[]){ "fixed_pll" },
 401                 .num_parents = 1,
 402         },
 403 };
 404
 405 static struct clk_fixed_factor gxbb_fclk_div4 = {
 406         .mult = 1,
 407         .div = 4,
 408         .hw.init = &(struct clk_init_data){
 409                 .name = "fclk_div4",
 410                 .ops = &clk_fixed_factor_ops,
 411                 .parent_names = (const char *[]){ "fixed_pll" },
 412                 .num_parents = 1,
 413         },
 414 };
 415
 416 static struct clk_fixed_factor gxbb_fclk_div5 = {
 417         .mult = 1,
 418         .div = 5,
 419         .hw.init = &(struct clk_init_data){
 420                 .name = "fclk_div5",
 421                 .ops = &clk_fixed_factor_ops,
 422                 .parent_names = (const char *[]){ "fixed_pll" },
 423                 .num_parents = 1,
 424         },
 425 };
 426
 427 static struct clk_fixed_factor gxbb_fclk_div7 = {
 428         .mult = 1,
 429         .div = 7,
 430         .hw.init = &(struct clk_init_data){
 431                 .name = "fclk_div7",
 432                 .ops = &clk_fixed_factor_ops,
 433                 .parent_names = (const char *[]){ "fixed_pll" },
 434                 .num_parents = 1,
 435         },
 436 };
 437
 438 static struct meson_clk_mpll gxbb_mpll0 = {
 439         .sdm = {
 440                 .reg_off = HHI_MPLL_CNTL7,
 441                 .shift   = 0,
 442                 .width   = 14,
 443         },
 444         .n2 = {
 445                 .reg_off = HHI_MPLL_CNTL7,
 446                 .shift   = 16,
 447                 .width   = 9,
 448         },
 449         .lock = &clk_lock,
 450         .hw.init = &(struct clk_init_data){
 451                 .name = "mpll0",
 452                 .ops = &meson_clk_mpll_ro_ops,
 453                 .parent_names = (const char *[]){ "fixed_pll" },
 454                 .num_parents = 1,
 455         },
 456 };
 457
 458 static struct meson_clk_mpll gxbb_mpll1 = {
 459         .sdm = {
 460                 .reg_off = HHI_MPLL_CNTL8,
 461                 .shift   = 0,
 462                 .width   = 14,
 463         },
 464         .n2 = {
 465                 .reg_off = HHI_MPLL_CNTL8,
 466                 .shift   = 16,
 467                 .width   = 9,
 468         },
 469         .lock = &clk_lock,
 470         .hw.init = &(struct clk_init_data){
 471                 .name = "mpll1",
 472                 .ops = &meson_clk_mpll_ro_ops,
 473                 .parent_names = (const char *[]){ "fixed_pll" },
 474                 .num_parents = 1,
 475         },
 476 };
 477
 478 static struct meson_clk_mpll gxbb_mpll2 = {
 479         .sdm = {
 480                 .reg_off = HHI_MPLL_CNTL9,
 481                 .shift   = 0,
 482                 .width   = 14,
 483         },
 484         .n2 = {
 485                 .reg_off = HHI_MPLL_CNTL9,
 486                 .shift   = 16,
 487                 .width   = 9,
 488         },
 489         .lock = &clk_lock,
 490         .hw.init = &(struct clk_init_data){
 491                 .name = "mpll2",
 492                 .ops = &meson_clk_mpll_ro_ops,
 493                 .parent_names = (const char *[]){ "fixed_pll" },
 494                 .num_parents = 1,
 495         },
 496 };
 497
 498 /*
 499  * FIXME cpu clocks and the legacy composite clocks (e.g. clk81) are both PLL
 500  * post-dividers and should be modeled with their respective PLLs via the
 501  * forthcoming coordinated clock rates feature
 502  */
 503 static struct meson_clk_cpu gxbb_cpu_clk = {
 504         .reg_off = HHI_SYS_CPU_CLK_CNTL1,
 505         .div_table = cpu_div_table,
 506         .clk_nb.notifier_call = meson_clk_cpu_notifier_cb,
 507         .hw.init = &(struct clk_init_data){
 508                 .name = "cpu_clk",
 509                 .ops = &meson_clk_cpu_ops,
 510                 .parent_names = (const char *[]){ "sys_pll" },
 511                 .num_parents = 1,
 512         },
 513 };
 514
 515 static u32 mux_table_clk81[]    = { 6, 5, 7 };
 516
 517 static struct clk_mux gxbb_mpeg_clk_sel = {
 518         .reg = (void *)HHI_MPEG_CLK_CNTL,
 519         .mask = 0x7,
 520         .shift = 12,
 521         .flags = CLK_MUX_READ_ONLY,
 522         .table = mux_table_clk81,
 523         .lock = &clk_lock,
 524         .hw.init = &(struct clk_init_data){
 525                 .name = "mpeg_clk_sel",
 526                 .ops = &clk_mux_ro_ops,
 527                 /*
 528                  * FIXME bits 14:12 selects from 8 possible parents:
 529                  * xtal, 1'b0 (wtf), fclk_div7, mpll_clkout1, mpll_clkout2,
 530                  * fclk_div4, fclk_div3, fclk_div5
 531                  */
 532                 .parent_names = (const char *[]){ "fclk_div3", "fclk_div4",
 533                         "fclk_div5" },
 534                 .num_parents = 3,
 535                 .flags = (CLK_SET_RATE_NO_REPARENT | CLK_IGNORE_UNUSED),
 536         },
 537 };
 538
 539 static struct clk_divider gxbb_mpeg_clk_div = {
 540         .reg = (void *)HHI_MPEG_CLK_CNTL,
 541         .shift = 0,
 542         .width = 7,
 543         .lock = &clk_lock,
 544         .hw.init = &(struct clk_init_data){
 545                 .name = "mpeg_clk_div",
 546                 .ops = &clk_divider_ops,
 547                 .parent_names = (const char *[]){ "mpeg_clk_sel" },
 548                 .num_parents = 1,
 549                 .flags = (CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED),
 550         },
 551 };
 552
 553 /* the mother of dragons^W gates */
 554 static struct clk_gate gxbb_clk81 = {
 555         .reg = (void *)HHI_MPEG_CLK_CNTL,
 556         .bit_idx = 7,
 557         .lock = &clk_lock,
 558         .hw.init = &(struct clk_init_data){
 559                 .name = "clk81",
 560                 .ops = &clk_gate_ops,
 561                 .parent_names = (const char *[]){ "mpeg_clk_div" },
 562                 .num_parents = 1,
 563                 .flags = (CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED | CLK_IS_CRITICAL),
 564         },
 565 };
 566
 567 /* Everything Else (EE) domain gates */
 568 static MESON_GATE(ddr, HHI_GCLK_MPEG0, 0);
 569 static MESON_GATE(dos, HHI_GCLK_MPEG0, 1);
 570 static MESON_GATE(isa, HHI_GCLK_MPEG0, 5);
 571 static MESON_GATE(pl301, HHI_GCLK_MPEG0, 6);
 572 static MESON_GATE(periphs, HHI_GCLK_MPEG0, 7);
 573 static MESON_GATE(spicc, HHI_GCLK_MPEG0, 8);
 574 static MESON_GATE(i2c, HHI_GCLK_MPEG0, 9);
 575 static MESON_GATE(sar_adc, HHI_GCLK_MPEG0, 10);
 576 static MESON_GATE(smart_card, HHI_GCLK_MPEG0, 11);
 577 static MESON_GATE(rng0, HHI_GCLK_MPEG0, 12);
 578 static MESON_GATE(uart0, HHI_GCLK_MPEG0, 13);
 579 static MESON_GATE(sdhc, HHI_GCLK_MPEG0, 14);
 580 static MESON_GATE(stream, HHI_GCLK_MPEG0, 15);
 581 static MESON_GATE(async_fifo, HHI_GCLK_MPEG0, 16);
 582 static MESON_GATE(sdio, HHI_GCLK_MPEG0, 17);
 583 static MESON_GATE(abuf, HHI_GCLK_MPEG0, 18);
 584 static MESON_GATE(hiu_iface, HHI_GCLK_MPEG0, 19);
 585 static MESON_GATE(assist_misc, HHI_GCLK_MPEG0, 23);
 586 static MESON_GATE(spi, HHI_GCLK_MPEG0, 30);
 587
 588 static MESON_GATE(i2s_spdif, HHI_GCLK_MPEG1, 2);
 589 static MESON_GATE(eth, HHI_GCLK_MPEG1, 3);
 590 static MESON_GATE(demux, HHI_GCLK_MPEG1, 4);
 591 static MESON_GATE(aiu_glue, HHI_GCLK_MPEG1, 6);
 592 static MESON_GATE(iec958, HHI_GCLK_MPEG1, 7);
 593 static MESON_GATE(i2s_out, HHI_GCLK_MPEG1, 8);
 594 static MESON_GATE(amclk, HHI_GCLK_MPEG1, 9);
 595 static MESON_GATE(aififo2, HHI_GCLK_MPEG1, 10);
 596 static MESON_GATE(mixer, HHI_GCLK_MPEG1, 11);
 597 static MESON_GATE(mixer_iface, HHI_GCLK_MPEG1, 12);
 598 static MESON_GATE(adc, HHI_GCLK_MPEG1, 13);
 599 static MESON_GATE(blkmv, HHI_GCLK_MPEG1, 14);
 600 static MESON_GATE(aiu, HHI_GCLK_MPEG1, 15);
 601 static MESON_GATE(uart1, HHI_GCLK_MPEG1, 16);
 602 static MESON_GATE(g2d, HHI_GCLK_MPEG1, 20);
 603 static MESON_GATE(usb0, HHI_GCLK_MPEG1, 21);
 604 static MESON_GATE(usb1, HHI_GCLK_MPEG1, 22);
 605 static MESON_GATE(reset, HHI_GCLK_MPEG1, 23);
 606 static MESON_GATE(nand, HHI_GCLK_MPEG1, 24);
 607 static MESON_GATE(dos_parser, HHI_GCLK_MPEG1, 25);
 608 static MESON_GATE(usb, HHI_GCLK_MPEG1, 26);
 609 static MESON_GATE(vdin1, HHI_GCLK_MPEG1, 28);
 610 static MESON_GATE(ahb_arb0, HHI_GCLK_MPEG1, 29);
 611 static MESON_GATE(efuse, HHI_GCLK_MPEG1, 30);
 612 static MESON_GATE(boot_rom, HHI_GCLK_MPEG1, 31);
 613
 614 static MESON_GATE(ahb_data_bus, HHI_GCLK_MPEG2, 1);
 615 static MESON_GATE(ahb_ctrl_bus, HHI_GCLK_MPEG2, 2);
 616 static MESON_GATE(hdmi_intr_sync, HHI_GCLK_MPEG2, 3);
 617 static MESON_GATE(hdmi_pclk, HHI_GCLK_MPEG2, 4);
 618 static MESON_GATE(usb1_ddr_bridge, HHI_GCLK_MPEG2, 8);
 619 static MESON_GATE(usb0_ddr_bridge, HHI_GCLK_MPEG2, 9);
 620 static MESON_GATE(mmc_pclk, HHI_GCLK_MPEG2, 11);
 621 static MESON_GATE(dvin, HHI_GCLK_MPEG2, 12);
 622 static MESON_GATE(uart2, HHI_GCLK_MPEG2, 15);
 623 static MESON_GATE(sana, HHI_GCLK_MPEG2, 22);
 624 static MESON_GATE(vpu_intr, HHI_GCLK_MPEG2, 25);
 625 static MESON_GATE(sec_ahb_ahb3_bridge, HHI_GCLK_MPEG2, 26);
 626 static MESON_GATE(clk81_a53, HHI_GCLK_MPEG2, 29);
 627
 628 static MESON_GATE(vclk2_venci0, HHI_GCLK_OTHER, 1);
 629 static MESON_GATE(vclk2_venci1, HHI_GCLK_OTHER, 2);
 630 static MESON_GATE(vclk2_vencp0, HHI_GCLK_OTHER, 3);
 631 static MESON_GATE(vclk2_vencp1, HHI_GCLK_OTHER, 4);
 632 static MESON_GATE(gclk_venci_int0, HHI_GCLK_OTHER, 8);
 633 static MESON_GATE(gclk_vencp_int, HHI_GCLK_OTHER, 9);
 634 static MESON_GATE(dac_clk, HHI_GCLK_OTHER, 10);
 635 static MESON_GATE(aoclk_gate, HHI_GCLK_OTHER, 14);
 636 static MESON_GATE(iec958_gate, HHI_GCLK_OTHER, 16);
 637 static MESON_GATE(enc480p, HHI_GCLK_OTHER, 20);
 638 static MESON_GATE(rng1, HHI_GCLK_OTHER, 21);
 639 static MESON_GATE(gclk_venci_int1, HHI_GCLK_OTHER, 22);
 640 static MESON_GATE(vclk2_venclmcc, HHI_GCLK_OTHER, 24);
 641 static MESON_GATE(vclk2_vencl, HHI_GCLK_OTHER, 25);
 642 static MESON_GATE(vclk_other, HHI_GCLK_OTHER, 26);
 643 static MESON_GATE(edp, HHI_GCLK_OTHER, 31);
 644
 645 /* Always On (AO) domain gates */
 646
 647 static MESON_GATE(ao_media_cpu, HHI_GCLK_AO, 0);
 648 static MESON_GATE(ao_ahb_sram, HHI_GCLK_AO, 1);
 649 static MESON_GATE(ao_ahb_bus, HHI_GCLK_AO, 2);
 650 static MESON_GATE(ao_iface, HHI_GCLK_AO, 3);
 651 static MESON_GATE(ao_i2c, HHI_GCLK_AO, 4);
 652
 653 /* Array of all clocks provided by this provider */
 654
 655 static struct clk_hw_onecell_data gxbb_hw_onecell_data = {
 656         .hws = {
 657                 [CLKID_SYS_PLL]             = &gxbb_sys_pll.hw,
 658                 [CLKID_CPUCLK]              = &gxbb_cpu_clk.hw,
 659                 [CLKID_HDMI_PLL]            = &gxbb_hdmi_pll.hw,
 660                 [CLKID_FIXED_PLL]           = &gxbb_fixed_pll.hw,
 661                 [CLKID_FCLK_DIV2]           = &gxbb_fclk_div2.hw,
 662                 [CLKID_FCLK_DIV3]           = &gxbb_fclk_div3.hw,
 663                 [CLKID_FCLK_DIV4]           = &gxbb_fclk_div4.hw,
 664                 [CLKID_FCLK_DIV5]           = &gxbb_fclk_div5.hw,
 665                 [CLKID_FCLK_DIV7]           = &gxbb_fclk_div7.hw,
 666                 [CLKID_GP0_PLL]             = &gxbb_gp0_pll.hw,
 667                 [CLKID_MPEG_SEL]            = &gxbb_mpeg_clk_sel.hw,
 668                 [CLKID_MPEG_DIV]            = &gxbb_mpeg_clk_div.hw,
 669                 [CLKID_CLK81]               = &gxbb_clk81.hw,
 670                 [CLKID_MPLL0]               = &gxbb_mpll0.hw,
 671                 [CLKID_MPLL1]               = &gxbb_mpll1.hw,
 672                 [CLKID_MPLL2]               = &gxbb_mpll2.hw,
 673                 [CLKID_DDR]                 = &gxbb_ddr.hw,
 674                 [CLKID_DOS]                 = &gxbb_dos.hw,
 675                 [CLKID_ISA]                 = &gxbb_isa.hw,
 676                 [CLKID_PL301]               = &gxbb_pl301.hw,
 677                 [CLKID_PERIPHS]             = &gxbb_periphs.hw,
 678                 [CLKID_SPICC]               = &gxbb_spicc.hw,
 679                 [CLKID_I2C]                 = &gxbb_i2c.hw,
 680                 [CLKID_SAR_ADC]             = &gxbb_sar_adc.hw,
 681                 [CLKID_SMART_CARD]          = &gxbb_smart_card.hw,
 682                 [CLKID_RNG0]                = &gxbb_rng0.hw,
 683                 [CLKID_UART0]               = &gxbb_uart0.hw,
 684                 [CLKID_SDHC]                = &gxbb_sdhc.hw,
 685                 [CLKID_STREAM]              = &gxbb_stream.hw,
 686                 [CLKID_ASYNC_FIFO]          = &gxbb_async_fifo.hw,
 687                 [CLKID_SDIO]                = &gxbb_sdio.hw,
 688                 [CLKID_ABUF]                = &gxbb_abuf.hw,
 689                 [CLKID_HIU_IFACE]           = &gxbb_hiu_iface.hw,
 690                 [CLKID_ASSIST_MISC]         = &gxbb_assist_misc.hw,
 691                 [CLKID_SPI]                 = &gxbb_spi.hw,
 692                 [CLKID_I2S_SPDIF]           = &gxbb_i2s_spdif.hw,
 693                 [CLKID_ETH]                 = &gxbb_eth.hw,
 694                 [CLKID_DEMUX]               = &gxbb_demux.hw,
 695                 [CLKID_AIU_GLUE]            = &gxbb_aiu_glue.hw,
 696                 [CLKID_IEC958]              = &gxbb_iec958.hw,
 697                 [CLKID_I2S_OUT]             = &gxbb_i2s_out.hw,
 698                 [CLKID_AMCLK]               = &gxbb_amclk.hw,
 699                 [CLKID_AIFIFO2]             = &gxbb_aififo2.hw,
 700                 [CLKID_MIXER]               = &gxbb_mixer.hw,
 701                 [CLKID_MIXER_IFACE]         = &gxbb_mixer_iface.hw,
 702                 [CLKID_ADC]                 = &gxbb_adc.hw,
 703                 [CLKID_BLKMV]               = &gxbb_blkmv.hw,
 704                 [CLKID_AIU]                 = &gxbb_aiu.hw,
 705                 [CLKID_UART1]               = &gxbb_uart1.hw,
 706                 [CLKID_G2D]                 = &gxbb_g2d.hw,
 707                 [CLKID_USB0]                = &gxbb_usb0.hw,
 708                 [CLKID_USB1]                = &gxbb_usb1.hw,
 709                 [CLKID_RESET]               = &gxbb_reset.hw,
 710                 [CLKID_NAND]                = &gxbb_nand.hw,
 711                 [CLKID_DOS_PARSER]          = &gxbb_dos_parser.hw,
 712                 [CLKID_USB]                 = &gxbb_usb.hw,
 713                 [CLKID_VDIN1]               = &gxbb_vdin1.hw,
 714                 [CLKID_AHB_ARB0]            = &gxbb_ahb_arb0.hw,
 715                 [CLKID_EFUSE]               = &gxbb_efuse.hw,
 716                 [CLKID_BOOT_ROM]            = &gxbb_boot_rom.hw,
 717                 [CLKID_AHB_DATA_BUS]        = &gxbb_ahb_data_bus.hw,
 718                 [CLKID_AHB_CTRL_BUS]        = &gxbb_ahb_ctrl_bus.hw,
 719                 [CLKID_HDMI_INTR_SYNC]      = &gxbb_hdmi_intr_sync.hw,
 720                 [CLKID_HDMI_PCLK]           = &gxbb_hdmi_pclk.hw,
 721                 [CLKID_USB1_DDR_BRIDGE]     = &gxbb_usb1_ddr_bridge.hw,
 722                 [CLKID_USB0_DDR_BRIDGE]     = &gxbb_usb0_ddr_bridge.hw,
 723                 [CLKID_MMC_PCLK]            = &gxbb_mmc_pclk.hw,
 724                 [CLKID_DVIN]                = &gxbb_dvin.hw,
 725                 [CLKID_UART2]               = &gxbb_uart2.hw,
 726                 [CLKID_SANA]                = &gxbb_sana.hw,
 727                 [CLKID_VPU_INTR]            = &gxbb_vpu_intr.hw,
 728                 [CLKID_SEC_AHB_AHB3_BRIDGE] = &gxbb_sec_ahb_ahb3_bridge.hw,
 729                 [CLKID_CLK81_A53]           = &gxbb_clk81_a53.hw,
 730                 [CLKID_VCLK2_VENCI0]        = &gxbb_vclk2_venci0.hw,
 731                 [CLKID_VCLK2_VENCI1]        = &gxbb_vclk2_venci1.hw,
 732                 [CLKID_VCLK2_VENCP0]        = &gxbb_vclk2_vencp0.hw,
 733                 [CLKID_VCLK2_VENCP1]        = &gxbb_vclk2_vencp1.hw,
 734                 [CLKID_GCLK_VENCI_INT0]     = &gxbb_gclk_venci_int0.hw,
 735                 [CLKID_GCLK_VENCI_INT]      = &gxbb_gclk_vencp_int.hw,
 736                 [CLKID_DAC_CLK]             = &gxbb_dac_clk.hw,
 737                 [CLKID_AOCLK_GATE]          = &gxbb_aoclk_gate.hw,
 738                 [CLKID_IEC958_GATE]         = &gxbb_iec958_gate.hw,
 739                 [CLKID_ENC480P]             = &gxbb_enc480p.hw,
 740                 [CLKID_RNG1]                = &gxbb_rng1.hw,
 741                 [CLKID_GCLK_VENCI_INT1]     = &gxbb_gclk_venci_int1.hw,
 742                 [CLKID_VCLK2_VENCLMCC]      = &gxbb_vclk2_venclmcc.hw,
 743                 [CLKID_VCLK2_VENCL]         = &gxbb_vclk2_vencl.hw,
 744                 [CLKID_VCLK_OTHER]          = &gxbb_vclk_other.hw,
 745                 [CLKID_EDP]                 = &gxbb_edp.hw,
 746                 [CLKID_AO_MEDIA_CPU]        = &gxbb_ao_media_cpu.hw,
 747                 [CLKID_AO_AHB_SRAM]         = &gxbb_ao_ahb_sram.hw,
 748                 [CLKID_AO_AHB_BUS]          = &gxbb_ao_ahb_bus.hw,
 749                 [CLKID_AO_IFACE]            = &gxbb_ao_iface.hw,
 750                 [CLKID_AO_I2C]              = &gxbb_ao_i2c.hw,
 751         },
 752         .num = NR_CLKS,
 753 };
 754
 755 /* Convenience tables to populate base addresses in .probe */
 756
 757 static struct meson_clk_pll *const gxbb_clk_plls[] = {
 758         &gxbb_fixed_pll,
 759         &gxbb_hdmi_pll,
 760         &gxbb_sys_pll,
 761         &gxbb_gp0_pll,
 762 };
 763
 764 static struct meson_clk_mpll *const gxbb_clk_mplls[] = {
 765         &gxbb_mpll0,
 766         &gxbb_mpll1,
 767         &gxbb_mpll2,
 768 };
 769
 770 static struct clk_gate *gxbb_clk_gates[] = {
 771         &gxbb_clk81,
 772         &gxbb_ddr,
 773         &gxbb_dos,
 774         &gxbb_isa,
 775         &gxbb_pl301,
 776         &gxbb_periphs,
 777         &gxbb_spicc,
 778         &gxbb_i2c,
 779         &gxbb_sar_adc,
 780         &gxbb_smart_card,
 781         &gxbb_rng0,
 782         &gxbb_uart0,
 783         &gxbb_sdhc,
 784         &gxbb_stream,
 785         &gxbb_async_fifo,
 786         &gxbb_sdio,
 787         &gxbb_abuf,
 788         &gxbb_hiu_iface,
 789         &gxbb_assist_misc,
 790         &gxbb_spi,
 791         &gxbb_i2s_spdif,
 792         &gxbb_eth,
 793         &gxbb_demux,
 794         &gxbb_aiu_glue,
 795         &gxbb_iec958,
 796         &gxbb_i2s_out,
 797         &gxbb_amclk,
 798         &gxbb_aififo2,
 799         &gxbb_mixer,
 800         &gxbb_mixer_iface,
 801         &gxbb_adc,
 802         &gxbb_blkmv,
 803         &gxbb_aiu,
 804         &gxbb_uart1,
 805         &gxbb_g2d,
 806         &gxbb_usb0,
 807         &gxbb_usb1,
 808         &gxbb_reset,
 809         &gxbb_nand,
 810         &gxbb_dos_parser,
 811         &gxbb_usb,
 812         &gxbb_vdin1,
 813         &gxbb_ahb_arb0,
 814         &gxbb_efuse,
 815         &gxbb_boot_rom,
 816         &gxbb_ahb_data_bus,
 817         &gxbb_ahb_ctrl_bus,
 818         &gxbb_hdmi_intr_sync,
 819         &gxbb_hdmi_pclk,
 820         &gxbb_usb1_ddr_bridge,
 821         &gxbb_usb0_ddr_bridge,
 822         &gxbb_mmc_pclk,
 823         &gxbb_dvin,
 824         &gxbb_uart2,
 825         &gxbb_sana,
 826         &gxbb_vpu_intr,
 827         &gxbb_sec_ahb_ahb3_bridge,
 828         &gxbb_clk81_a53,
 829         &gxbb_vclk2_venci0,
 830         &gxbb_vclk2_venci1,
 831         &gxbb_vclk2_vencp0,
 832         &gxbb_vclk2_vencp1,
 833         &gxbb_gclk_venci_int0,
 834         &gxbb_gclk_vencp_int,
 835         &gxbb_dac_clk,
 836         &gxbb_aoclk_gate,
 837         &gxbb_iec958_gate,
 838         &gxbb_enc480p,
 839         &gxbb_rng1,
 840         &gxbb_gclk_venci_int1,
 841         &gxbb_vclk2_venclmcc,
 842         &gxbb_vclk2_vencl,
 843         &gxbb_vclk_other,
 844         &gxbb_edp,
 845         &gxbb_ao_media_cpu,
 846         &gxbb_ao_ahb_sram,
 847         &gxbb_ao_ahb_bus,
 848         &gxbb_ao_iface,
 849         &gxbb_ao_i2c,
 850 };
 851
 852 static int gxbb_clkc_probe(struct platform_device *pdev)
 853 {
 854         void __iomem *clk_base;
 855         int ret, clkid, i;
 856         struct clk_hw *parent_hw;
 857         struct clk *parent_clk;
 858         struct device *dev = &pdev->dev;
 859
 860         /*  Generic clocks and PLLs */
 861         clk_base = of_iomap(dev->of_node, 0);
 862         if (!clk_base) {
 863                 pr_err("%s: Unable to map clk base\n", __func__);
 864                 return -ENXIO;
 865         }
 866
 867         /* Populate base address for PLLs */
 868         for (i = 0; i < ARRAY_SIZE(gxbb_clk_plls); i++)
 869                 gxbb_clk_plls[i]->base = clk_base;
 870
 871         /* Populate base address for MPLLs */
 872         for (i = 0; i < ARRAY_SIZE(gxbb_clk_mplls); i++)
 873                 gxbb_clk_mplls[i]->base = clk_base;
 874
 875         /* Populate the base address for CPU clk */
 876         gxbb_cpu_clk.base = clk_base;
 877
 878         /* Populate the base address for the MPEG clks */
 879         gxbb_mpeg_clk_sel.reg = clk_base + (u64)gxbb_mpeg_clk_sel.reg;
 880         gxbb_mpeg_clk_div.reg = clk_base + (u64)gxbb_mpeg_clk_div.reg;
 881
 882         /* Populate base address for gates */
 883         for (i = 0; i < ARRAY_SIZE(gxbb_clk_gates); i++)
 884                 gxbb_clk_gates[i]->reg = clk_base +
 885                         (u64)gxbb_clk_gates[i]->reg;
 886
 887         /*
 888          * register all clks
 889          */
 890         for (clkid = 0; clkid < NR_CLKS; clkid++) {
 891                 ret = devm_clk_hw_register(dev, gxbb_hw_onecell_data.hws[clkid]);
 892                 if (ret)
 893                         goto iounmap;
 894         }
 895
 896         /*
 897          * Register CPU clk notifier
 898          *
 899          * FIXME this is wrong for a lot of reasons. First, the muxes should be
 900          * struct clk_hw objects. Second, we shouldn't program the muxes in
 901          * notifier handlers. The tricky programming sequence will be handled
 902          * by the forthcoming coordinated clock rates mechanism once that
 903          * feature is released.
 904          *
 905          * Furthermore, looking up the parent this way is terrible. At some
 906          * point we will stop allocating a default struct clk when registering
 907          * a new clk_hw, and this hack will no longer work. Releasing the ccr
 908          * feature before that time solves the problem :-)
 909          */
 910         parent_hw = clk_hw_get_parent(&gxbb_cpu_clk.hw);
 911         parent_clk = parent_hw->clk;
 912         ret = clk_notifier_register(parent_clk, &gxbb_cpu_clk.clk_nb);
 913         if (ret) {
 914                 pr_err("%s: failed to register clock notifier for cpu_clk\n",
 915                                 __func__);
 916                 goto iounmap;
 917         }
 918
 919         return of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
 920                         &gxbb_hw_onecell_data);
 921
 922 iounmap:
 923         iounmap(clk_base);
 924         return ret;
 925 }
 926
 927 static const struct of_device_id gxbb_clkc_match_table[] = {
 928         { .compatible = "amlogic,gxbb-clkc" },
 929         { }
 930 };
 931
 932 static struct platform_driver gxbb_driver = {
 933         .probe          = gxbb_clkc_probe,
 934         .driver         = {
 935                 .name   = "gxbb-clkc",
 936                 .of_match_table = gxbb_clkc_match_table,
 937         },
 938 };
 939
 940 static int __init gxbb_clkc_init(void)
 941 {
 942         return platform_driver_register(&gxbb_driver);
 943 }
 944 device_initcall(gxbb_clkc_init);