1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * TI CDCE706 programmable 3-PLL clock synthesizer driver
4 *
5 * Copyright (c) 2014 Cadence Design Systems Inc.
6 *
7 * Reference: https://www.ti.com/lit/ds/symlink/cdce706.pdf
8 */
9
10 #include <linux/clk.h>
11 #include <linux/clk-provider.h>
12 #include <linux/delay.h>
13 #include <linux/i2c.h>
14 #include <linux/interrupt.h>
15 #include <linux/mod_devicetable.h>
16 #include <linux/module.h>
17 #include <linux/of.h>
18 #include <linux/rational.h>
19 #include <linux/regmap.h>
20 #include <linux/slab.h>
21
22 #define CDCE706_CLKIN_CLOCK 10
23 #define CDCE706_CLKIN_SOURCE 11
24 #define CDCE706_PLL_M_LOW(pll) (1 + 3 * (pll))
25 #define CDCE706_PLL_N_LOW(pll) (2 + 3 * (pll))
26 #define CDCE706_PLL_HI(pll) (3 + 3 * (pll))
27 #define CDCE706_PLL_MUX 3
28 #define CDCE706_PLL_FVCO 6
29 #define CDCE706_DIVIDER(div) (13 + (div))
30 #define CDCE706_CLKOUT(out) (19 + (out))
31
32 #define CDCE706_CLKIN_CLOCK_MASK 0x10
33 #define CDCE706_CLKIN_SOURCE_SHIFT 6
34 #define CDCE706_CLKIN_SOURCE_MASK 0xc0
35 #define CDCE706_CLKIN_SOURCE_LVCMOS 0x40
36
37 #define CDCE706_PLL_MUX_MASK(pll) (0x80 >> (pll))
38 #define CDCE706_PLL_LOW_M_MASK 0xff
39 #define CDCE706_PLL_LOW_N_MASK 0xff
40 #define CDCE706_PLL_HI_M_MASK 0x1
41 #define CDCE706_PLL_HI_N_MASK 0x1e
42 #define CDCE706_PLL_HI_N_SHIFT 1
43 #define CDCE706_PLL_M_MAX 0x1ff
44 #define CDCE706_PLL_N_MAX 0xfff
45 #define CDCE706_PLL_FVCO_MASK(pll) (0x80 >> (pll))
46 #define CDCE706_PLL_FREQ_MIN 80000000
47 #define CDCE706_PLL_FREQ_MAX 300000000
48 #define CDCE706_PLL_FREQ_HI 180000000
49
50 #define CDCE706_DIVIDER_PLL(div) (9 + (div) - ((div) > 2) - ((div) > 4))
51 #define CDCE706_DIVIDER_PLL_SHIFT(div) ((div) < 2 ? 5 : 3 * ((div) & 1))
52 #define CDCE706_DIVIDER_PLL_MASK(div) (0x7 << CDCE706_DIVIDER_PLL_SHIFT(div))
53 #define CDCE706_DIVIDER_DIVIDER_MASK 0x7f
54 #define CDCE706_DIVIDER_DIVIDER_MAX 0x7f
55
56 #define CDCE706_CLKOUT_DIVIDER_MASK 0x7
57 #define CDCE706_CLKOUT_ENABLE_MASK 0x8
58
59 static const struct regmap_config cdce706_regmap_config = {
60 .reg_bits = 8,
61 .val_bits = 8,
62 .val_format_endian = REGMAP_ENDIAN_NATIVE,
63 };
64
65 #define to_hw_data(phw) (container_of((phw), struct cdce706_hw_data, hw))
66
67 struct cdce706_hw_data {
68 struct cdce706_dev_data *dev_data;
69 unsigned idx;
70 unsigned parent;
71 struct clk_hw hw;
72 unsigned div;
73 unsigned mul;
74 unsigned mux;
75 };
76
77 struct cdce706_dev_data {
78 struct i2c_client *client;
79 struct regmap *regmap;
80 struct clk *clkin_clk[2];
81 const char *clkin_name[2];
82 struct cdce706_hw_data clkin[1];
83 struct cdce706_hw_data pll[3];
84 struct cdce706_hw_data divider[6];
85 struct cdce706_hw_data clkout[6];
86 };
87
88 static const char * const cdce706_source_name[] = {
89 "clk_in0", "clk_in1",
90 };
91
92 static const char * const cdce706_clkin_name[] = {
93 "clk_in",
94 };
95
96 static const char * const cdce706_pll_name[] = {
97 "pll1", "pll2", "pll3",
98 };
99
100 static const char * const cdce706_divider_parent_name[] = {
101 "clk_in", "pll1", "pll2", "pll2", "pll3",
102 };
103
104 static const char *cdce706_divider_name[] = {
105 "p0", "p1", "p2", "p3", "p4", "p5",
106 };
107
108 static const char * const cdce706_clkout_name[] = {
109 "clk_out0", "clk_out1", "clk_out2", "clk_out3", "clk_out4", "clk_out5",
110 };
111
cdce706_reg_read(struct cdce706_dev_data * dev_data,unsigned reg,unsigned * val)112 static int cdce706_reg_read(struct cdce706_dev_data *dev_data, unsigned reg,
113 unsigned *val)
114 {
115 int rc = regmap_read(dev_data->regmap, reg | 0x80, val);
116
117 if (rc < 0)
118 dev_err(&dev_data->client->dev, "error reading reg %u", reg);
119 return rc;
120 }
121
cdce706_reg_write(struct cdce706_dev_data * dev_data,unsigned reg,unsigned val)122 static int cdce706_reg_write(struct cdce706_dev_data *dev_data, unsigned reg,
123 unsigned val)
124 {
125 int rc = regmap_write(dev_data->regmap, reg | 0x80, val);
126
127 if (rc < 0)
128 dev_err(&dev_data->client->dev, "error writing reg %u", reg);
129 return rc;
130 }
131
cdce706_reg_update(struct cdce706_dev_data * dev_data,unsigned reg,unsigned mask,unsigned val)132 static int cdce706_reg_update(struct cdce706_dev_data *dev_data, unsigned reg,
133 unsigned mask, unsigned val)
134 {
135 int rc = regmap_update_bits(dev_data->regmap, reg | 0x80, mask, val);
136
137 if (rc < 0)
138 dev_err(&dev_data->client->dev, "error updating reg %u", reg);
139 return rc;
140 }
141
cdce706_clkin_set_parent(struct clk_hw * hw,u8 index)142 static int cdce706_clkin_set_parent(struct clk_hw *hw, u8 index)
143 {
144 struct cdce706_hw_data *hwd = to_hw_data(hw);
145
146 hwd->parent = index;
147 return 0;
148 }
149
cdce706_clkin_get_parent(struct clk_hw * hw)150 static u8 cdce706_clkin_get_parent(struct clk_hw *hw)
151 {
152 struct cdce706_hw_data *hwd = to_hw_data(hw);
153
154 return hwd->parent;
155 }
156
157 static const struct clk_ops cdce706_clkin_ops = {
158 .determine_rate = clk_hw_determine_rate_no_reparent,
159 .set_parent = cdce706_clkin_set_parent,
160 .get_parent = cdce706_clkin_get_parent,
161 };
162
cdce706_pll_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)163 static unsigned long cdce706_pll_recalc_rate(struct clk_hw *hw,
164 unsigned long parent_rate)
165 {
166 struct cdce706_hw_data *hwd = to_hw_data(hw);
167
168 dev_dbg(&hwd->dev_data->client->dev,
169 "%s, pll: %d, mux: %d, mul: %u, div: %u\n",
170 __func__, hwd->idx, hwd->mux, hwd->mul, hwd->div);
171
172 if (!hwd->mux) {
173 if (hwd->div && hwd->mul) {
174 u64 res = (u64)parent_rate * hwd->mul;
175
176 do_div(res, hwd->div);
177 return res;
178 }
179 } else {
180 if (hwd->div)
181 return parent_rate / hwd->div;
182 }
183 return 0;
184 }
185
cdce706_pll_round_rate(struct clk_hw * hw,unsigned long rate,unsigned long * parent_rate)186 static long cdce706_pll_round_rate(struct clk_hw *hw, unsigned long rate,
187 unsigned long *parent_rate)
188 {
189 struct cdce706_hw_data *hwd = to_hw_data(hw);
190 unsigned long mul, div;
191 u64 res;
192
193 dev_dbg(&hwd->dev_data->client->dev,
194 "%s, rate: %lu, parent_rate: %lu\n",
195 __func__, rate, *parent_rate);
196
197 rational_best_approximation(rate, *parent_rate,
198 CDCE706_PLL_N_MAX, CDCE706_PLL_M_MAX,
199 &mul, &div);
200 hwd->mul = mul;
201 hwd->div = div;
202
203 dev_dbg(&hwd->dev_data->client->dev,
204 "%s, pll: %d, mul: %lu, div: %lu\n",
205 __func__, hwd->idx, mul, div);
206
207 res = (u64)*parent_rate * hwd->mul;
208 do_div(res, hwd->div);
209 return res;
210 }
211
cdce706_pll_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)212 static int cdce706_pll_set_rate(struct clk_hw *hw, unsigned long rate,
213 unsigned long parent_rate)
214 {
215 struct cdce706_hw_data *hwd = to_hw_data(hw);
216 unsigned long mul = hwd->mul, div = hwd->div;
217 int err;
218
219 dev_dbg(&hwd->dev_data->client->dev,
220 "%s, pll: %d, mul: %lu, div: %lu\n",
221 __func__, hwd->idx, mul, div);
222
223 err = cdce706_reg_update(hwd->dev_data,
224 CDCE706_PLL_HI(hwd->idx),
225 CDCE706_PLL_HI_M_MASK | CDCE706_PLL_HI_N_MASK,
226 ((div >> 8) & CDCE706_PLL_HI_M_MASK) |
227 ((mul >> (8 - CDCE706_PLL_HI_N_SHIFT)) &
228 CDCE706_PLL_HI_N_MASK));
229 if (err < 0)
230 return err;
231
232 err = cdce706_reg_write(hwd->dev_data,
233 CDCE706_PLL_M_LOW(hwd->idx),
234 div & CDCE706_PLL_LOW_M_MASK);
235 if (err < 0)
236 return err;
237
238 err = cdce706_reg_write(hwd->dev_data,
239 CDCE706_PLL_N_LOW(hwd->idx),
240 mul & CDCE706_PLL_LOW_N_MASK);
241 if (err < 0)
242 return err;
243
244 err = cdce706_reg_update(hwd->dev_data,
245 CDCE706_PLL_FVCO,
246 CDCE706_PLL_FVCO_MASK(hwd->idx),
247 rate > CDCE706_PLL_FREQ_HI ?
248 CDCE706_PLL_FVCO_MASK(hwd->idx) : 0);
249 return err;
250 }
251
252 static const struct clk_ops cdce706_pll_ops = {
253 .recalc_rate = cdce706_pll_recalc_rate,
254 .round_rate = cdce706_pll_round_rate,
255 .set_rate = cdce706_pll_set_rate,
256 };
257
cdce706_divider_set_parent(struct clk_hw * hw,u8 index)258 static int cdce706_divider_set_parent(struct clk_hw *hw, u8 index)
259 {
260 struct cdce706_hw_data *hwd = to_hw_data(hw);
261
262 if (hwd->parent == index)
263 return 0;
264 hwd->parent = index;
265 return cdce706_reg_update(hwd->dev_data,
266 CDCE706_DIVIDER_PLL(hwd->idx),
267 CDCE706_DIVIDER_PLL_MASK(hwd->idx),
268 index << CDCE706_DIVIDER_PLL_SHIFT(hwd->idx));
269 }
270
cdce706_divider_get_parent(struct clk_hw * hw)271 static u8 cdce706_divider_get_parent(struct clk_hw *hw)
272 {
273 struct cdce706_hw_data *hwd = to_hw_data(hw);
274
275 return hwd->parent;
276 }
277
cdce706_divider_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)278 static unsigned long cdce706_divider_recalc_rate(struct clk_hw *hw,
279 unsigned long parent_rate)
280 {
281 struct cdce706_hw_data *hwd = to_hw_data(hw);
282
283 dev_dbg(&hwd->dev_data->client->dev,
284 "%s, divider: %d, div: %u\n",
285 __func__, hwd->idx, hwd->div);
286 if (hwd->div)
287 return parent_rate / hwd->div;
288 return 0;
289 }
290
cdce706_divider_determine_rate(struct clk_hw * hw,struct clk_rate_request * req)291 static int cdce706_divider_determine_rate(struct clk_hw *hw,
292 struct clk_rate_request *req)
293 {
294 struct cdce706_hw_data *hwd = to_hw_data(hw);
295 struct cdce706_dev_data *cdce = hwd->dev_data;
296 unsigned long rate = req->rate;
297 unsigned long mul, div;
298
299 dev_dbg(&hwd->dev_data->client->dev,
300 "%s, rate: %lu, parent_rate: %lu\n",
301 __func__, rate, req->best_parent_rate);
302
303 rational_best_approximation(rate, req->best_parent_rate,
304 1, CDCE706_DIVIDER_DIVIDER_MAX,
305 &mul, &div);
306 if (!mul)
307 div = CDCE706_DIVIDER_DIVIDER_MAX;
308
309 if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) {
310 unsigned long best_diff = rate;
311 unsigned long best_div = 0;
312 struct clk *gp_clk = cdce->clkin_clk[cdce->clkin[0].parent];
313 unsigned long gp_rate = gp_clk ? clk_get_rate(gp_clk) : 0;
314
315 for (div = CDCE706_PLL_FREQ_MIN / rate; best_diff &&
316 div <= CDCE706_PLL_FREQ_MAX / rate; ++div) {
317 unsigned long n, m;
318 unsigned long diff;
319 unsigned long div_rate;
320 u64 div_rate64;
321
322 if (rate * div < CDCE706_PLL_FREQ_MIN)
323 continue;
324
325 rational_best_approximation(rate * div, gp_rate,
326 CDCE706_PLL_N_MAX,
327 CDCE706_PLL_M_MAX,
328 &n, &m);
329 div_rate64 = (u64)gp_rate * n;
330 do_div(div_rate64, m);
331 do_div(div_rate64, div);
332 div_rate = div_rate64;
333 diff = max(div_rate, rate) - min(div_rate, rate);
334
335 if (diff < best_diff) {
336 best_diff = diff;
337 best_div = div;
338 dev_dbg(&hwd->dev_data->client->dev,
339 "%s, %lu * %lu / %lu / %lu = %lu\n",
340 __func__, gp_rate, n, m, div, div_rate);
341 }
342 }
343
344 div = best_div;
345
346 dev_dbg(&hwd->dev_data->client->dev,
347 "%s, altering parent rate: %lu -> %lu\n",
348 __func__, req->best_parent_rate, rate * div);
349 req->best_parent_rate = rate * div;
350 }
351 hwd->div = div;
352
353 dev_dbg(&hwd->dev_data->client->dev,
354 "%s, divider: %d, div: %lu\n",
355 __func__, hwd->idx, div);
356
357 req->rate = req->best_parent_rate / div;
358 return 0;
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 .determine_rate = cdce706_divider_determine_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_determine_rate(struct clk_hw * hw,struct clk_rate_request * req)426 static int cdce706_clkout_determine_rate(struct clk_hw *hw,
427 struct clk_rate_request *req)
428 {
429 req->best_parent_rate = req->rate;
430
431 return 0;
432 }
433
cdce706_clkout_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)434 static int cdce706_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
435 unsigned long parent_rate)
436 {
437 return 0;
438 }
439
440 static const struct clk_ops cdce706_clkout_ops = {
441 .prepare = cdce706_clkout_prepare,
442 .unprepare = cdce706_clkout_unprepare,
443 .set_parent = cdce706_clkout_set_parent,
444 .get_parent = cdce706_clkout_get_parent,
445 .recalc_rate = cdce706_clkout_recalc_rate,
446 .determine_rate = cdce706_clkout_determine_rate,
447 .set_rate = cdce706_clkout_set_rate,
448 };
449
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)450 static int cdce706_register_hw(struct cdce706_dev_data *cdce,
451 struct cdce706_hw_data *hw, unsigned num_hw,
452 const char * const *clk_names,
453 struct clk_init_data *init)
454 {
455 unsigned i;
456 int ret;
457
458 for (i = 0; i < num_hw; ++i, ++hw) {
459 init->name = clk_names[i];
460 hw->dev_data = cdce;
461 hw->idx = i;
462 hw->hw.init = init;
463 ret = devm_clk_hw_register(&cdce->client->dev,
464 &hw->hw);
465 if (ret) {
466 dev_err(&cdce->client->dev, "Failed to register %s\n",
467 clk_names[i]);
468 return ret;
469 }
470 }
471 return 0;
472 }
473
cdce706_register_clkin(struct cdce706_dev_data * cdce)474 static int cdce706_register_clkin(struct cdce706_dev_data *cdce)
475 {
476 struct clk_init_data init = {
477 .ops = &cdce706_clkin_ops,
478 .parent_names = cdce->clkin_name,
479 .num_parents = ARRAY_SIZE(cdce->clkin_name),
480 };
481 unsigned i;
482 int ret;
483 unsigned clock, source;
484
485 for (i = 0; i < ARRAY_SIZE(cdce->clkin_name); ++i) {
486 struct clk *parent = devm_clk_get(&cdce->client->dev,
487 cdce706_source_name[i]);
488
489 if (IS_ERR(parent)) {
490 cdce->clkin_name[i] = cdce706_source_name[i];
491 } else {
492 cdce->clkin_name[i] = __clk_get_name(parent);
493 cdce->clkin_clk[i] = parent;
494 }
495 }
496
497 ret = cdce706_reg_read(cdce, CDCE706_CLKIN_SOURCE, &source);
498 if (ret < 0)
499 return ret;
500 if ((source & CDCE706_CLKIN_SOURCE_MASK) ==
501 CDCE706_CLKIN_SOURCE_LVCMOS) {
502 ret = cdce706_reg_read(cdce, CDCE706_CLKIN_CLOCK, &clock);
503 if (ret < 0)
504 return ret;
505 cdce->clkin[0].parent = !!(clock & CDCE706_CLKIN_CLOCK_MASK);
506 }
507
508 ret = cdce706_register_hw(cdce, cdce->clkin,
509 ARRAY_SIZE(cdce->clkin),
510 cdce706_clkin_name, &init);
511 return ret;
512 }
513
cdce706_register_plls(struct cdce706_dev_data * cdce)514 static int cdce706_register_plls(struct cdce706_dev_data *cdce)
515 {
516 struct clk_init_data init = {
517 .ops = &cdce706_pll_ops,
518 .parent_names = cdce706_clkin_name,
519 .num_parents = ARRAY_SIZE(cdce706_clkin_name),
520 };
521 unsigned i;
522 int ret;
523 unsigned mux;
524
525 ret = cdce706_reg_read(cdce, CDCE706_PLL_MUX, &mux);
526 if (ret < 0)
527 return ret;
528
529 for (i = 0; i < ARRAY_SIZE(cdce->pll); ++i) {
530 unsigned m, n, v;
531
532 ret = cdce706_reg_read(cdce, CDCE706_PLL_M_LOW(i), &m);
533 if (ret < 0)
534 return ret;
535 ret = cdce706_reg_read(cdce, CDCE706_PLL_N_LOW(i), &n);
536 if (ret < 0)
537 return ret;
538 ret = cdce706_reg_read(cdce, CDCE706_PLL_HI(i), &v);
539 if (ret < 0)
540 return ret;
541 cdce->pll[i].div = m | ((v & CDCE706_PLL_HI_M_MASK) << 8);
542 cdce->pll[i].mul = n | ((v & CDCE706_PLL_HI_N_MASK) <<
543 (8 - CDCE706_PLL_HI_N_SHIFT));
544 cdce->pll[i].mux = mux & CDCE706_PLL_MUX_MASK(i);
545 dev_dbg(&cdce->client->dev,
546 "%s: i: %u, div: %u, mul: %u, mux: %d\n", __func__, i,
547 cdce->pll[i].div, cdce->pll[i].mul, cdce->pll[i].mux);
548 }
549
550 ret = cdce706_register_hw(cdce, cdce->pll,
551 ARRAY_SIZE(cdce->pll),
552 cdce706_pll_name, &init);
553 return ret;
554 }
555
cdce706_register_dividers(struct cdce706_dev_data * cdce)556 static int cdce706_register_dividers(struct cdce706_dev_data *cdce)
557 {
558 struct clk_init_data init = {
559 .ops = &cdce706_divider_ops,
560 .parent_names = cdce706_divider_parent_name,
561 .num_parents = ARRAY_SIZE(cdce706_divider_parent_name),
562 .flags = CLK_SET_RATE_PARENT,
563 };
564 unsigned i;
565 int ret;
566
567 for (i = 0; i < ARRAY_SIZE(cdce->divider); ++i) {
568 unsigned val;
569
570 ret = cdce706_reg_read(cdce, CDCE706_DIVIDER_PLL(i), &val);
571 if (ret < 0)
572 return ret;
573 cdce->divider[i].parent =
574 (val & CDCE706_DIVIDER_PLL_MASK(i)) >>
575 CDCE706_DIVIDER_PLL_SHIFT(i);
576
577 ret = cdce706_reg_read(cdce, CDCE706_DIVIDER(i), &val);
578 if (ret < 0)
579 return ret;
580 cdce->divider[i].div = val & CDCE706_DIVIDER_DIVIDER_MASK;
581 dev_dbg(&cdce->client->dev,
582 "%s: i: %u, parent: %u, div: %u\n", __func__, i,
583 cdce->divider[i].parent, cdce->divider[i].div);
584 }
585
586 ret = cdce706_register_hw(cdce, cdce->divider,
587 ARRAY_SIZE(cdce->divider),
588 cdce706_divider_name, &init);
589 return ret;
590 }
591
cdce706_register_clkouts(struct cdce706_dev_data * cdce)592 static int cdce706_register_clkouts(struct cdce706_dev_data *cdce)
593 {
594 struct clk_init_data init = {
595 .ops = &cdce706_clkout_ops,
596 .parent_names = cdce706_divider_name,
597 .num_parents = ARRAY_SIZE(cdce706_divider_name),
598 .flags = CLK_SET_RATE_PARENT,
599 };
600 unsigned i;
601 int ret;
602
603 for (i = 0; i < ARRAY_SIZE(cdce->clkout); ++i) {
604 unsigned val;
605
606 ret = cdce706_reg_read(cdce, CDCE706_CLKOUT(i), &val);
607 if (ret < 0)
608 return ret;
609 cdce->clkout[i].parent = val & CDCE706_CLKOUT_DIVIDER_MASK;
610 dev_dbg(&cdce->client->dev,
611 "%s: i: %u, parent: %u\n", __func__, i,
612 cdce->clkout[i].parent);
613 }
614
615 return cdce706_register_hw(cdce, cdce->clkout,
616 ARRAY_SIZE(cdce->clkout),
617 cdce706_clkout_name, &init);
618 }
619
620 static struct clk_hw *
of_clk_cdce_get(struct of_phandle_args * clkspec,void * data)621 of_clk_cdce_get(struct of_phandle_args *clkspec, void *data)
622 {
623 struct cdce706_dev_data *cdce = data;
624 unsigned int idx = clkspec->args[0];
625
626 if (idx >= ARRAY_SIZE(cdce->clkout)) {
627 pr_err("%s: invalid index %u\n", __func__, idx);
628 return ERR_PTR(-EINVAL);
629 }
630
631 return &cdce->clkout[idx].hw;
632 }
633
cdce706_probe(struct i2c_client * client)634 static int cdce706_probe(struct i2c_client *client)
635 {
636 struct i2c_adapter *adapter = client->adapter;
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 devm_of_clk_add_hw_provider(&client->dev, of_clk_cdce_get,
669 cdce);
670 }
671
672 #ifdef CONFIG_OF
673 static const struct of_device_id cdce706_dt_match[] = {
674 { .compatible = "ti,cdce706" },
675 { },
676 };
677 MODULE_DEVICE_TABLE(of, cdce706_dt_match);
678 #endif
679
680 static const struct i2c_device_id cdce706_id[] = {
681 { "cdce706", 0 },
682 { }
683 };
684 MODULE_DEVICE_TABLE(i2c, cdce706_id);
685
686 static struct i2c_driver cdce706_i2c_driver = {
687 .driver = {
688 .name = "cdce706",
689 .of_match_table = of_match_ptr(cdce706_dt_match),
690 },
691 .probe = cdce706_probe,
692 .id_table = cdce706_id,
693 };
694 module_i2c_driver(cdce706_i2c_driver);
695
696 MODULE_AUTHOR("Max Filippov <jcmvbkbc@gmail.com>");
697 MODULE_DESCRIPTION("TI CDCE 706 clock synthesizer driver");
698 MODULE_LICENSE("GPL");
699