1 /*
2 * TI CDCE706 programmable 3-PLL clock synthesizer driver
3 *
4 * Copyright (c) 2014 Cadence Design Systems Inc.
5 *
6 * Reference: http://www.ti.com/lit/ds/symlink/cdce706.pdf
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/clk.h>
14 #include <linux/clk-provider.h>
15 #include <linux/delay.h>
16 #include <linux/i2c.h>
17 #include <linux/interrupt.h>
18 #include <linux/mod_devicetable.h>
19 #include <linux/module.h>
20 #include <linux/of.h>
21 #include <linux/rational.h>
22 #include <linux/regmap.h>
23 #include <linux/slab.h>
24
25 #define CDCE706_CLKIN_CLOCK 10
26 #define CDCE706_CLKIN_SOURCE 11
27 #define CDCE706_PLL_M_LOW(pll) (1 + 3 * (pll))
28 #define CDCE706_PLL_N_LOW(pll) (2 + 3 * (pll))
29 #define CDCE706_PLL_HI(pll) (3 + 3 * (pll))
30 #define CDCE706_PLL_MUX 3
31 #define CDCE706_PLL_FVCO 6
32 #define CDCE706_DIVIDER(div) (13 + (div))
33 #define CDCE706_CLKOUT(out) (19 + (out))
34
35 #define CDCE706_CLKIN_CLOCK_MASK 0x10
36 #define CDCE706_CLKIN_SOURCE_SHIFT 6
37 #define CDCE706_CLKIN_SOURCE_MASK 0xc0
38 #define CDCE706_CLKIN_SOURCE_LVCMOS 0x40
39
40 #define CDCE706_PLL_MUX_MASK(pll) (0x80 >> (pll))
41 #define CDCE706_PLL_LOW_M_MASK 0xff
42 #define CDCE706_PLL_LOW_N_MASK 0xff
43 #define CDCE706_PLL_HI_M_MASK 0x1
44 #define CDCE706_PLL_HI_N_MASK 0x1e
45 #define CDCE706_PLL_HI_N_SHIFT 1
46 #define CDCE706_PLL_M_MAX 0x1ff
47 #define CDCE706_PLL_N_MAX 0xfff
48 #define CDCE706_PLL_FVCO_MASK(pll) (0x80 >> (pll))
49 #define CDCE706_PLL_FREQ_MIN 80000000
50 #define CDCE706_PLL_FREQ_MAX 300000000
51 #define CDCE706_PLL_FREQ_HI 180000000
52
53 #define CDCE706_DIVIDER_PLL(div) (9 + (div) - ((div) > 2) - ((div) > 4))
54 #define CDCE706_DIVIDER_PLL_SHIFT(div) ((div) < 2 ? 5 : 3 * ((div) & 1))
55 #define CDCE706_DIVIDER_PLL_MASK(div) (0x7 << CDCE706_DIVIDER_PLL_SHIFT(div))
56 #define CDCE706_DIVIDER_DIVIDER_MASK 0x7f
57 #define CDCE706_DIVIDER_DIVIDER_MAX 0x7f
58
59 #define CDCE706_CLKOUT_DIVIDER_MASK 0x7
60 #define CDCE706_CLKOUT_ENABLE_MASK 0x8
61
62 static const struct regmap_config cdce706_regmap_config = {
63 .reg_bits = 8,
64 .val_bits = 8,
65 .val_format_endian = REGMAP_ENDIAN_NATIVE,
66 };
67
68 #define to_hw_data(phw) (container_of((phw), struct cdce706_hw_data, hw))
69
70 struct cdce706_hw_data {
71 struct cdce706_dev_data *dev_data;
72 unsigned idx;
73 unsigned parent;
74 struct clk_hw hw;
75 unsigned div;
76 unsigned mul;
77 unsigned mux;
78 };
79
80 struct cdce706_dev_data {
81 struct i2c_client *client;
82 struct regmap *regmap;
83 struct clk *clkin_clk[2];
84 const char *clkin_name[2];
85 struct cdce706_hw_data clkin[1];
86 struct cdce706_hw_data pll[3];
87 struct cdce706_hw_data divider[6];
88 struct cdce706_hw_data clkout[6];
89 };
90
91 static const char * const cdce706_source_name[] = {
92 "clk_in0", "clk_in1",
93 };
94
95 static const char * const cdce706_clkin_name[] = {
96 "clk_in",
97 };
98
99 static const char * const cdce706_pll_name[] = {
100 "pll1", "pll2", "pll3",
101 };
102
103 static const char * const cdce706_divider_parent_name[] = {
104 "clk_in", "pll1", "pll2", "pll2", "pll3",
105 };
106
107 static const char *cdce706_divider_name[] = {
108 "p0", "p1", "p2", "p3", "p4", "p5",
109 };
110
111 static const char * const cdce706_clkout_name[] = {
112 "clk_out0", "clk_out1", "clk_out2", "clk_out3", "clk_out4", "clk_out5",
113 };
114
cdce706_reg_read(struct cdce706_dev_data * dev_data,unsigned reg,unsigned * val)115 static int cdce706_reg_read(struct cdce706_dev_data *dev_data, unsigned reg,
116 unsigned *val)
117 {
118 int rc = regmap_read(dev_data->regmap, reg | 0x80, val);
119
120 if (rc < 0)
121 dev_err(&dev_data->client->dev, "error reading reg %u", reg);
122 return rc;
123 }
124
cdce706_reg_write(struct cdce706_dev_data * dev_data,unsigned reg,unsigned val)125 static int cdce706_reg_write(struct cdce706_dev_data *dev_data, unsigned reg,
126 unsigned val)
127 {
128 int rc = regmap_write(dev_data->regmap, reg | 0x80, val);
129
130 if (rc < 0)
131 dev_err(&dev_data->client->dev, "error writing reg %u", reg);
132 return rc;
133 }
134
cdce706_reg_update(struct cdce706_dev_data * dev_data,unsigned reg,unsigned mask,unsigned val)135 static int cdce706_reg_update(struct cdce706_dev_data *dev_data, unsigned reg,
136 unsigned mask, unsigned val)
137 {
138 int rc = regmap_update_bits(dev_data->regmap, reg | 0x80, mask, val);
139
140 if (rc < 0)
141 dev_err(&dev_data->client->dev, "error updating reg %u", reg);
142 return rc;
143 }
144
cdce706_clkin_set_parent(struct clk_hw * hw,u8 index)145 static int cdce706_clkin_set_parent(struct clk_hw *hw, u8 index)
146 {
147 struct cdce706_hw_data *hwd = to_hw_data(hw);
148
149 hwd->parent = index;
150 return 0;
151 }
152
cdce706_clkin_get_parent(struct clk_hw * hw)153 static u8 cdce706_clkin_get_parent(struct clk_hw *hw)
154 {
155 struct cdce706_hw_data *hwd = to_hw_data(hw);
156
157 return hwd->parent;
158 }
159
160 static const struct clk_ops cdce706_clkin_ops = {
161 .set_parent = cdce706_clkin_set_parent,
162 .get_parent = cdce706_clkin_get_parent,
163 };
164
cdce706_pll_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)165 static unsigned long cdce706_pll_recalc_rate(struct clk_hw *hw,
166 unsigned long parent_rate)
167 {
168 struct cdce706_hw_data *hwd = to_hw_data(hw);
169
170 dev_dbg(&hwd->dev_data->client->dev,
171 "%s, pll: %d, mux: %d, mul: %u, div: %u\n",
172 __func__, hwd->idx, hwd->mux, hwd->mul, hwd->div);
173
174 if (!hwd->mux) {
175 if (hwd->div && hwd->mul) {
176 u64 res = (u64)parent_rate * hwd->mul;
177
178 do_div(res, hwd->div);
179 return res;
180 }
181 } else {
182 if (hwd->div)
183 return parent_rate / hwd->div;
184 }
185 return 0;
186 }
187
cdce706_pll_round_rate(struct clk_hw * hw,unsigned long rate,unsigned long * parent_rate)188 static long cdce706_pll_round_rate(struct clk_hw *hw, unsigned long rate,
189 unsigned long *parent_rate)
190 {
191 struct cdce706_hw_data *hwd = to_hw_data(hw);
192 unsigned long mul, div;
193 u64 res;
194
195 dev_dbg(&hwd->dev_data->client->dev,
196 "%s, rate: %lu, parent_rate: %lu\n",
197 __func__, rate, *parent_rate);
198
199 rational_best_approximation(rate, *parent_rate,
200 CDCE706_PLL_N_MAX, CDCE706_PLL_M_MAX,
201 &mul, &div);
202 hwd->mul = mul;
203 hwd->div = div;
204
205 dev_dbg(&hwd->dev_data->client->dev,
206 "%s, pll: %d, mul: %lu, div: %lu\n",
207 __func__, hwd->idx, mul, div);
208
209 res = (u64)*parent_rate * hwd->mul;
210 do_div(res, hwd->div);
211 return res;
212 }
213
cdce706_pll_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)214 static int cdce706_pll_set_rate(struct clk_hw *hw, unsigned long rate,
215 unsigned long parent_rate)
216 {
217 struct cdce706_hw_data *hwd = to_hw_data(hw);
218 unsigned long mul = hwd->mul, div = hwd->div;
219 int err;
220
221 dev_dbg(&hwd->dev_data->client->dev,
222 "%s, pll: %d, mul: %lu, div: %lu\n",
223 __func__, hwd->idx, mul, div);
224
225 err = cdce706_reg_update(hwd->dev_data,
226 CDCE706_PLL_HI(hwd->idx),
227 CDCE706_PLL_HI_M_MASK | CDCE706_PLL_HI_N_MASK,
228 ((div >> 8) & CDCE706_PLL_HI_M_MASK) |
229 ((mul >> (8 - CDCE706_PLL_HI_N_SHIFT)) &
230 CDCE706_PLL_HI_N_MASK));
231 if (err < 0)
232 return err;
233
234 err = cdce706_reg_write(hwd->dev_data,
235 CDCE706_PLL_M_LOW(hwd->idx),
236 div & CDCE706_PLL_LOW_M_MASK);
237 if (err < 0)
238 return err;
239
240 err = cdce706_reg_write(hwd->dev_data,
241 CDCE706_PLL_N_LOW(hwd->idx),
242 mul & CDCE706_PLL_LOW_N_MASK);
243 if (err < 0)
244 return err;
245
246 err = cdce706_reg_update(hwd->dev_data,
247 CDCE706_PLL_FVCO,
248 CDCE706_PLL_FVCO_MASK(hwd->idx),
249 rate > CDCE706_PLL_FREQ_HI ?
250 CDCE706_PLL_FVCO_MASK(hwd->idx) : 0);
251 return err;
252 }
253
254 static const struct clk_ops cdce706_pll_ops = {
255 .recalc_rate = cdce706_pll_recalc_rate,
256 .round_rate = cdce706_pll_round_rate,
257 .set_rate = cdce706_pll_set_rate,
258 };
259
cdce706_divider_set_parent(struct clk_hw * hw,u8 index)260 static int cdce706_divider_set_parent(struct clk_hw *hw, u8 index)
261 {
262 struct cdce706_hw_data *hwd = to_hw_data(hw);
263
264 if (hwd->parent == index)
265 return 0;
266 hwd->parent = index;
267 return cdce706_reg_update(hwd->dev_data,
268 CDCE706_DIVIDER_PLL(hwd->idx),
269 CDCE706_DIVIDER_PLL_MASK(hwd->idx),
270 index << CDCE706_DIVIDER_PLL_SHIFT(hwd->idx));
271 }
272
cdce706_divider_get_parent(struct clk_hw * hw)273 static u8 cdce706_divider_get_parent(struct clk_hw *hw)
274 {
275 struct cdce706_hw_data *hwd = to_hw_data(hw);
276
277 return hwd->parent;
278 }
279
cdce706_divider_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)280 static unsigned long cdce706_divider_recalc_rate(struct clk_hw *hw,
281 unsigned long parent_rate)
282 {
283 struct cdce706_hw_data *hwd = to_hw_data(hw);
284
285 dev_dbg(&hwd->dev_data->client->dev,
286 "%s, divider: %d, div: %u\n",
287 __func__, hwd->idx, hwd->div);
288 if (hwd->div)
289 return parent_rate / hwd->div;
290 return 0;
291 }
292
cdce706_divider_round_rate(struct clk_hw * hw,unsigned long rate,unsigned long * parent_rate)293 static long cdce706_divider_round_rate(struct clk_hw *hw, unsigned long rate,
294 unsigned long *parent_rate)
295 {
296 struct cdce706_hw_data *hwd = to_hw_data(hw);
297 struct cdce706_dev_data *cdce = hwd->dev_data;
298 unsigned long mul, div;
299
300 dev_dbg(&hwd->dev_data->client->dev,
301 "%s, rate: %lu, parent_rate: %lu\n",
302 __func__, rate, *parent_rate);
303
304 rational_best_approximation(rate, *parent_rate,
305 1, CDCE706_DIVIDER_DIVIDER_MAX,
306 &mul, &div);
307 if (!mul)
308 div = CDCE706_DIVIDER_DIVIDER_MAX;
309
310 if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) {
311 unsigned long best_diff = rate;
312 unsigned long best_div = 0;
313 struct clk *gp_clk = cdce->clkin_clk[cdce->clkin[0].parent];
314 unsigned long gp_rate = gp_clk ? clk_get_rate(gp_clk) : 0;
315
316 for (div = CDCE706_PLL_FREQ_MIN / rate; best_diff &&
317 div <= CDCE706_PLL_FREQ_MAX / rate; ++div) {
318 unsigned long n, m;
319 unsigned long diff;
320 unsigned long div_rate;
321 u64 div_rate64;
322
323 if (rate * div < CDCE706_PLL_FREQ_MIN)
324 continue;
325
326 rational_best_approximation(rate * div, gp_rate,
327 CDCE706_PLL_N_MAX,
328 CDCE706_PLL_M_MAX,
329 &n, &m);
330 div_rate64 = (u64)gp_rate * n;
331 do_div(div_rate64, m);
332 do_div(div_rate64, div);
333 div_rate = div_rate64;
334 diff = max(div_rate, rate) - min(div_rate, rate);
335
336 if (diff < best_diff) {
337 best_diff = diff;
338 best_div = div;
339 dev_dbg(&hwd->dev_data->client->dev,
340 "%s, %lu * %lu / %lu / %lu = %lu\n",
341 __func__, gp_rate, n, m, div, div_rate);
342 }
343 }
344
345 div = best_div;
346
347 dev_dbg(&hwd->dev_data->client->dev,
348 "%s, altering parent rate: %lu -> %lu\n",
349 __func__, *parent_rate, rate * div);
350 *parent_rate = rate * div;
351 }
352 hwd->div = div;
353
354 dev_dbg(&hwd->dev_data->client->dev,
355 "%s, divider: %d, div: %lu\n",
356 __func__, hwd->idx, div);
357
358 return *parent_rate / div;
359 }
360
cdce706_divider_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)361 static int cdce706_divider_set_rate(struct clk_hw *hw, unsigned long rate,
362 unsigned long parent_rate)
363 {
364 struct cdce706_hw_data *hwd = to_hw_data(hw);
365
366 dev_dbg(&hwd->dev_data->client->dev,
367 "%s, divider: %d, div: %u\n",
368 __func__, hwd->idx, hwd->div);
369
370 return cdce706_reg_update(hwd->dev_data,
371 CDCE706_DIVIDER(hwd->idx),
372 CDCE706_DIVIDER_DIVIDER_MASK,
373 hwd->div);
374 }
375
376 static const struct clk_ops cdce706_divider_ops = {
377 .set_parent = cdce706_divider_set_parent,
378 .get_parent = cdce706_divider_get_parent,
379 .recalc_rate = cdce706_divider_recalc_rate,
380 .round_rate = cdce706_divider_round_rate,
381 .set_rate = cdce706_divider_set_rate,
382 };
383
cdce706_clkout_prepare(struct clk_hw * hw)384 static int cdce706_clkout_prepare(struct clk_hw *hw)
385 {
386 struct cdce706_hw_data *hwd = to_hw_data(hw);
387
388 return cdce706_reg_update(hwd->dev_data, CDCE706_CLKOUT(hwd->idx),
389 CDCE706_CLKOUT_ENABLE_MASK,
390 CDCE706_CLKOUT_ENABLE_MASK);
391 }
392
cdce706_clkout_unprepare(struct clk_hw * hw)393 static void cdce706_clkout_unprepare(struct clk_hw *hw)
394 {
395 struct cdce706_hw_data *hwd = to_hw_data(hw);
396
397 cdce706_reg_update(hwd->dev_data, CDCE706_CLKOUT(hwd->idx),
398 CDCE706_CLKOUT_ENABLE_MASK, 0);
399 }
400
cdce706_clkout_set_parent(struct clk_hw * hw,u8 index)401 static int cdce706_clkout_set_parent(struct clk_hw *hw, u8 index)
402 {
403 struct cdce706_hw_data *hwd = to_hw_data(hw);
404
405 if (hwd->parent == index)
406 return 0;
407 hwd->parent = index;
408 return cdce706_reg_update(hwd->dev_data,
409 CDCE706_CLKOUT(hwd->idx),
410 CDCE706_CLKOUT_ENABLE_MASK, index);
411 }
412
cdce706_clkout_get_parent(struct clk_hw * hw)413 static u8 cdce706_clkout_get_parent(struct clk_hw *hw)
414 {
415 struct cdce706_hw_data *hwd = to_hw_data(hw);
416
417 return hwd->parent;
418 }
419
cdce706_clkout_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)420 static unsigned long cdce706_clkout_recalc_rate(struct clk_hw *hw,
421 unsigned long parent_rate)
422 {
423 return parent_rate;
424 }
425
cdce706_clkout_round_rate(struct clk_hw * hw,unsigned long rate,unsigned long * parent_rate)426 static long cdce706_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
427 unsigned long *parent_rate)
428 {
429 *parent_rate = rate;
430 return rate;
431 }
432
cdce706_clkout_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)433 static int cdce706_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
434 unsigned long parent_rate)
435 {
436 return 0;
437 }
438
439 static const struct clk_ops cdce706_clkout_ops = {
440 .prepare = cdce706_clkout_prepare,
441 .unprepare = cdce706_clkout_unprepare,
442 .set_parent = cdce706_clkout_set_parent,
443 .get_parent = cdce706_clkout_get_parent,
444 .recalc_rate = cdce706_clkout_recalc_rate,
445 .round_rate = cdce706_clkout_round_rate,
446 .set_rate = cdce706_clkout_set_rate,
447 };
448
cdce706_register_hw(struct cdce706_dev_data * cdce,struct cdce706_hw_data * hw,unsigned num_hw,const char * const * clk_names,struct clk_init_data * init)449 static int cdce706_register_hw(struct cdce706_dev_data *cdce,
450 struct cdce706_hw_data *hw, unsigned num_hw,
451 const char * const *clk_names,
452 struct clk_init_data *init)
453 {
454 unsigned i;
455 int ret;
456
457 for (i = 0; i < num_hw; ++i, ++hw) {
458 init->name = clk_names[i];
459 hw->dev_data = cdce;
460 hw->idx = i;
461 hw->hw.init = init;
462 ret = devm_clk_hw_register(&cdce->client->dev,
463 &hw->hw);
464 if (ret) {
465 dev_err(&cdce->client->dev, "Failed to register %s\n",
466 clk_names[i]);
467 return ret;
468 }
469 }
470 return 0;
471 }
472
cdce706_register_clkin(struct cdce706_dev_data * cdce)473 static int cdce706_register_clkin(struct cdce706_dev_data *cdce)
474 {
475 struct clk_init_data init = {
476 .ops = &cdce706_clkin_ops,
477 .parent_names = cdce->clkin_name,
478 .num_parents = ARRAY_SIZE(cdce->clkin_name),
479 };
480 unsigned i;
481 int ret;
482 unsigned clock, source;
483
484 for (i = 0; i < ARRAY_SIZE(cdce->clkin_name); ++i) {
485 struct clk *parent = devm_clk_get(&cdce->client->dev,
486 cdce706_source_name[i]);
487
488 if (IS_ERR(parent)) {
489 cdce->clkin_name[i] = cdce706_source_name[i];
490 } else {
491 cdce->clkin_name[i] = __clk_get_name(parent);
492 cdce->clkin_clk[i] = parent;
493 }
494 }
495
496 ret = cdce706_reg_read(cdce, CDCE706_CLKIN_SOURCE, &source);
497 if (ret < 0)
498 return ret;
499 if ((source & CDCE706_CLKIN_SOURCE_MASK) ==
500 CDCE706_CLKIN_SOURCE_LVCMOS) {
501 ret = cdce706_reg_read(cdce, CDCE706_CLKIN_CLOCK, &clock);
502 if (ret < 0)
503 return ret;
504 cdce->clkin[0].parent = !!(clock & CDCE706_CLKIN_CLOCK_MASK);
505 }
506
507 ret = cdce706_register_hw(cdce, cdce->clkin,
508 ARRAY_SIZE(cdce->clkin),
509 cdce706_clkin_name, &init);
510 return ret;
511 }
512
cdce706_register_plls(struct cdce706_dev_data * cdce)513 static int cdce706_register_plls(struct cdce706_dev_data *cdce)
514 {
515 struct clk_init_data init = {
516 .ops = &cdce706_pll_ops,
517 .parent_names = cdce706_clkin_name,
518 .num_parents = ARRAY_SIZE(cdce706_clkin_name),
519 };
520 unsigned i;
521 int ret;
522 unsigned mux;
523
524 ret = cdce706_reg_read(cdce, CDCE706_PLL_MUX, &mux);
525 if (ret < 0)
526 return ret;
527
528 for (i = 0; i < ARRAY_SIZE(cdce->pll); ++i) {
529 unsigned m, n, v;
530
531 ret = cdce706_reg_read(cdce, CDCE706_PLL_M_LOW(i), &m);
532 if (ret < 0)
533 return ret;
534 ret = cdce706_reg_read(cdce, CDCE706_PLL_N_LOW(i), &n);
535 if (ret < 0)
536 return ret;
537 ret = cdce706_reg_read(cdce, CDCE706_PLL_HI(i), &v);
538 if (ret < 0)
539 return ret;
540 cdce->pll[i].div = m | ((v & CDCE706_PLL_HI_M_MASK) << 8);
541 cdce->pll[i].mul = n | ((v & CDCE706_PLL_HI_N_MASK) <<
542 (8 - CDCE706_PLL_HI_N_SHIFT));
543 cdce->pll[i].mux = mux & CDCE706_PLL_MUX_MASK(i);
544 dev_dbg(&cdce->client->dev,
545 "%s: i: %u, div: %u, mul: %u, mux: %d\n", __func__, i,
546 cdce->pll[i].div, cdce->pll[i].mul, cdce->pll[i].mux);
547 }
548
549 ret = cdce706_register_hw(cdce, cdce->pll,
550 ARRAY_SIZE(cdce->pll),
551 cdce706_pll_name, &init);
552 return ret;
553 }
554
cdce706_register_dividers(struct cdce706_dev_data * cdce)555 static int cdce706_register_dividers(struct cdce706_dev_data *cdce)
556 {
557 struct clk_init_data init = {
558 .ops = &cdce706_divider_ops,
559 .parent_names = cdce706_divider_parent_name,
560 .num_parents = ARRAY_SIZE(cdce706_divider_parent_name),
561 .flags = CLK_SET_RATE_PARENT,
562 };
563 unsigned i;
564 int ret;
565
566 for (i = 0; i < ARRAY_SIZE(cdce->divider); ++i) {
567 unsigned val;
568
569 ret = cdce706_reg_read(cdce, CDCE706_DIVIDER_PLL(i), &val);
570 if (ret < 0)
571 return ret;
572 cdce->divider[i].parent =
573 (val & CDCE706_DIVIDER_PLL_MASK(i)) >>
574 CDCE706_DIVIDER_PLL_SHIFT(i);
575
576 ret = cdce706_reg_read(cdce, CDCE706_DIVIDER(i), &val);
577 if (ret < 0)
578 return ret;
579 cdce->divider[i].div = val & CDCE706_DIVIDER_DIVIDER_MASK;
580 dev_dbg(&cdce->client->dev,
581 "%s: i: %u, parent: %u, div: %u\n", __func__, i,
582 cdce->divider[i].parent, cdce->divider[i].div);
583 }
584
585 ret = cdce706_register_hw(cdce, cdce->divider,
586 ARRAY_SIZE(cdce->divider),
587 cdce706_divider_name, &init);
588 return ret;
589 }
590
cdce706_register_clkouts(struct cdce706_dev_data * cdce)591 static int cdce706_register_clkouts(struct cdce706_dev_data *cdce)
592 {
593 struct clk_init_data init = {
594 .ops = &cdce706_clkout_ops,
595 .parent_names = cdce706_divider_name,
596 .num_parents = ARRAY_SIZE(cdce706_divider_name),
597 .flags = CLK_SET_RATE_PARENT,
598 };
599 unsigned i;
600 int ret;
601
602 for (i = 0; i < ARRAY_SIZE(cdce->clkout); ++i) {
603 unsigned val;
604
605 ret = cdce706_reg_read(cdce, CDCE706_CLKOUT(i), &val);
606 if (ret < 0)
607 return ret;
608 cdce->clkout[i].parent = val & CDCE706_CLKOUT_DIVIDER_MASK;
609 dev_dbg(&cdce->client->dev,
610 "%s: i: %u, parent: %u\n", __func__, i,
611 cdce->clkout[i].parent);
612 }
613
614 return cdce706_register_hw(cdce, cdce->clkout,
615 ARRAY_SIZE(cdce->clkout),
616 cdce706_clkout_name, &init);
617 }
618
619 static struct clk_hw *
of_clk_cdce_get(struct of_phandle_args * clkspec,void * data)620 of_clk_cdce_get(struct of_phandle_args *clkspec, void *data)
621 {
622 struct cdce706_dev_data *cdce = data;
623 unsigned int idx = clkspec->args[0];
624
625 if (idx >= ARRAY_SIZE(cdce->clkout)) {
626 pr_err("%s: invalid index %u\n", __func__, idx);
627 return ERR_PTR(-EINVAL);
628 }
629
630 return &cdce->clkout[idx].hw;
631 }
632
cdce706_probe(struct i2c_client * client,const struct i2c_device_id * id)633 static int cdce706_probe(struct i2c_client *client,
634 const struct i2c_device_id *id)
635 {
636 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
637 struct cdce706_dev_data *cdce;
638 int ret;
639
640 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
641 return -EIO;
642
643 cdce = devm_kzalloc(&client->dev, sizeof(*cdce), GFP_KERNEL);
644 if (!cdce)
645 return -ENOMEM;
646
647 cdce->client = client;
648 cdce->regmap = devm_regmap_init_i2c(client, &cdce706_regmap_config);
649 if (IS_ERR(cdce->regmap)) {
650 dev_err(&client->dev, "Failed to initialize regmap\n");
651 return -EINVAL;
652 }
653
654 i2c_set_clientdata(client, cdce);
655
656 ret = cdce706_register_clkin(cdce);
657 if (ret < 0)
658 return ret;
659 ret = cdce706_register_plls(cdce);
660 if (ret < 0)
661 return ret;
662 ret = cdce706_register_dividers(cdce);
663 if (ret < 0)
664 return ret;
665 ret = cdce706_register_clkouts(cdce);
666 if (ret < 0)
667 return ret;
668 return of_clk_add_hw_provider(client->dev.of_node, of_clk_cdce_get,
669 cdce);
670 }
671
cdce706_remove(struct i2c_client * client)672 static int cdce706_remove(struct i2c_client *client)
673 {
674 of_clk_del_provider(client->dev.of_node);
675 return 0;
676 }
677
678
679 #ifdef CONFIG_OF
680 static const struct of_device_id cdce706_dt_match[] = {
681 { .compatible = "ti,cdce706" },
682 { },
683 };
684 MODULE_DEVICE_TABLE(of, cdce706_dt_match);
685 #endif
686
687 static const struct i2c_device_id cdce706_id[] = {
688 { "cdce706", 0 },
689 { }
690 };
691 MODULE_DEVICE_TABLE(i2c, cdce706_id);
692
693 static struct i2c_driver cdce706_i2c_driver = {
694 .driver = {
695 .name = "cdce706",
696 .of_match_table = of_match_ptr(cdce706_dt_match),
697 },
698 .probe = cdce706_probe,
699 .remove = cdce706_remove,
700 .id_table = cdce706_id,
701 };
702 module_i2c_driver(cdce706_i2c_driver);
703
704 MODULE_AUTHOR("Max Filippov <jcmvbkbc@gmail.com>");
705 MODULE_DESCRIPTION("TI CDCE 706 clock synthesizer driver");
706 MODULE_LICENSE("GPL");
707
