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cpuset: restore sanity to cpuset_cpus_allowed_fallback()
[linux/fpc-iii.git] / drivers / clk / clk-si5351.c
blob50e7c341e97e91c6faaaef55bbdd27645248679c
1 /*
2 * clk-si5351.c: Silicon Laboratories Si5351A/B/C I2C Clock Generator
3 *
4 * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
5 * Rabeeh Khoury <rabeeh@solid-run.com>
6 *
7 * References:
8 * [1] "Si5351A/B/C Data Sheet"
9 * http://www.silabs.com/Support%20Documents/TechnicalDocs/Si5351.pdf
10 * [2] "Manually Generating an Si5351 Register Map"
11 * http://www.silabs.com/Support%20Documents/TechnicalDocs/AN619.pdf
12 *
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the
15 * Free Software Foundation; either version 2 of the License, or (at your
16 * option) any later version.
17 */
18
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/clk.h>
22 #include <linux/clk-provider.h>
23 #include <linux/delay.h>
24 #include <linux/err.h>
25 #include <linux/errno.h>
26 #include <linux/rational.h>
27 #include <linux/i2c.h>
28 #include <linux/of_platform.h>
29 #include <linux/platform_data/si5351.h>
30 #include <linux/regmap.h>
31 #include <linux/slab.h>
32 #include <linux/string.h>
33 #include <asm/div64.h>
34
35 #include "clk-si5351.h"
36
37 struct si5351_driver_data;
38
39 struct si5351_parameters {
40 unsigned long p1;
41 unsigned long p2;
42 unsigned long p3;
43 int valid;
44 };
45
46 struct si5351_hw_data {
47 struct clk_hw hw;
48 struct si5351_driver_data *drvdata;
49 struct si5351_parameters params;
50 unsigned char num;
51 };
52
53 struct si5351_driver_data {
54 enum si5351_variant variant;
55 struct i2c_client *client;
56 struct regmap *regmap;
57
58 struct clk *pxtal;
59 const char *pxtal_name;
60 struct clk_hw xtal;
61 struct clk *pclkin;
62 const char *pclkin_name;
63 struct clk_hw clkin;
64
65 struct si5351_hw_data pll[2];
66 struct si5351_hw_data *msynth;
67 struct si5351_hw_data *clkout;
68 size_t num_clkout;
69 };
70
71 static const char * const si5351_input_names[] = {
72 "xtal", "clkin"
73 };
74 static const char * const si5351_pll_names[] = {
75 "si5351_plla", "si5351_pllb", "si5351_vxco"
76 };
77 static const char * const si5351_msynth_names[] = {
78 "ms0", "ms1", "ms2", "ms3", "ms4", "ms5", "ms6", "ms7"
79 };
80 static const char * const si5351_clkout_names[] = {
81 "clk0", "clk1", "clk2", "clk3", "clk4", "clk5", "clk6", "clk7"
82 };
83
84 /*
85 * Si5351 i2c regmap
86 */
87 static inline u8 si5351_reg_read(struct si5351_driver_data *drvdata, u8 reg)
88 {
89 u32 val;
90 int ret;
91
92 ret = regmap_read(drvdata->regmap, reg, &val);
93 if (ret) {
94 dev_err(&drvdata->client->dev,
95 "unable to read from reg%02x\n", reg);
96 return 0;
97 }
98
99 return (u8)val;
100 }
101
102 static inline int si5351_bulk_read(struct si5351_driver_data *drvdata,
103 u8 reg, u8 count, u8 *buf)
104 {
105 return regmap_bulk_read(drvdata->regmap, reg, buf, count);
106 }
107
108 static inline int si5351_reg_write(struct si5351_driver_data *drvdata,
109 u8 reg, u8 val)
110 {
111 return regmap_write(drvdata->regmap, reg, val);
112 }
113
114 static inline int si5351_bulk_write(struct si5351_driver_data *drvdata,
115 u8 reg, u8 count, const u8 *buf)
116 {
117 return regmap_raw_write(drvdata->regmap, reg, buf, count);
118 }
119
120 static inline int si5351_set_bits(struct si5351_driver_data *drvdata,
121 u8 reg, u8 mask, u8 val)
122 {
123 return regmap_update_bits(drvdata->regmap, reg, mask, val);
124 }
125
126 static inline u8 si5351_msynth_params_address(int num)
127 {
128 if (num > 5)
129 return SI5351_CLK6_PARAMETERS + (num - 6);
130 return SI5351_CLK0_PARAMETERS + (SI5351_PARAMETERS_LENGTH * num);
131 }
132
133 static void si5351_read_parameters(struct si5351_driver_data *drvdata,
134 u8 reg, struct si5351_parameters *params)
135 {
136 u8 buf[SI5351_PARAMETERS_LENGTH];
137
138 switch (reg) {
139 case SI5351_CLK6_PARAMETERS:
140 case SI5351_CLK7_PARAMETERS:
141 buf[0] = si5351_reg_read(drvdata, reg);
142 params->p1 = buf[0];
143 params->p2 = 0;
144 params->p3 = 1;
145 break;
146 default:
147 si5351_bulk_read(drvdata, reg, SI5351_PARAMETERS_LENGTH, buf);
148 params->p1 = ((buf[2] & 0x03) << 16) | (buf[3] << 8) | buf[4];
149 params->p2 = ((buf[5] & 0x0f) << 16) | (buf[6] << 8) | buf[7];
150 params->p3 = ((buf[5] & 0xf0) << 12) | (buf[0] << 8) | buf[1];
151 }
152 params->valid = 1;
153 }
154
155 static void si5351_write_parameters(struct si5351_driver_data *drvdata,
156 u8 reg, struct si5351_parameters *params)
157 {
158 u8 buf[SI5351_PARAMETERS_LENGTH];
159
160 switch (reg) {
161 case SI5351_CLK6_PARAMETERS:
162 case SI5351_CLK7_PARAMETERS:
163 buf[0] = params->p1 & 0xff;
164 si5351_reg_write(drvdata, reg, buf[0]);
165 break;
166 default:
167 buf[0] = ((params->p3 & 0x0ff00) >> 8) & 0xff;
168 buf[1] = params->p3 & 0xff;
169 /* save rdiv and divby4 */
170 buf[2] = si5351_reg_read(drvdata, reg + 2) & ~0x03;
171 buf[2] |= ((params->p1 & 0x30000) >> 16) & 0x03;
172 buf[3] = ((params->p1 & 0x0ff00) >> 8) & 0xff;
173 buf[4] = params->p1 & 0xff;
174 buf[5] = ((params->p3 & 0xf0000) >> 12) |
175 ((params->p2 & 0xf0000) >> 16);
176 buf[6] = ((params->p2 & 0x0ff00) >> 8) & 0xff;
177 buf[7] = params->p2 & 0xff;
178 si5351_bulk_write(drvdata, reg, SI5351_PARAMETERS_LENGTH, buf);
179 }
180 }
181
182 static bool si5351_regmap_is_volatile(struct device *dev, unsigned int reg)
183 {
184 switch (reg) {
185 case SI5351_DEVICE_STATUS:
186 case SI5351_INTERRUPT_STATUS:
187 case SI5351_PLL_RESET:
188 return true;
189 }
190 return false;
191 }
192
193 static bool si5351_regmap_is_writeable(struct device *dev, unsigned int reg)
194 {
195 /* reserved registers */
196 if (reg >= 4 && reg <= 8)
197 return false;
198 if (reg >= 10 && reg <= 14)
199 return false;
200 if (reg >= 173 && reg <= 176)
201 return false;
202 if (reg >= 178 && reg <= 182)
203 return false;
204 /* read-only */
205 if (reg == SI5351_DEVICE_STATUS)
206 return false;
207 return true;
208 }
209
210 static const struct regmap_config si5351_regmap_config = {
211 .reg_bits = 8,
212 .val_bits = 8,
213 .cache_type = REGCACHE_RBTREE,
214 .max_register = 187,
215 .writeable_reg = si5351_regmap_is_writeable,
216 .volatile_reg = si5351_regmap_is_volatile,
217 };
218
219 /*
220 * Si5351 xtal clock input
221 */
222 static int si5351_xtal_prepare(struct clk_hw *hw)
223 {
224 struct si5351_driver_data *drvdata =
225 container_of(hw, struct si5351_driver_data, xtal);
226 si5351_set_bits(drvdata, SI5351_FANOUT_ENABLE,
227 SI5351_XTAL_ENABLE, SI5351_XTAL_ENABLE);
228 return 0;
229 }
230
231 static void si5351_xtal_unprepare(struct clk_hw *hw)
232 {
233 struct si5351_driver_data *drvdata =
234 container_of(hw, struct si5351_driver_data, xtal);
235 si5351_set_bits(drvdata, SI5351_FANOUT_ENABLE,
236 SI5351_XTAL_ENABLE, 0);
237 }
238
239 static const struct clk_ops si5351_xtal_ops = {
240 .prepare = si5351_xtal_prepare,
241 .unprepare = si5351_xtal_unprepare,
242 };
243
244 /*
245 * Si5351 clkin clock input (Si5351C only)
246 */
247 static int si5351_clkin_prepare(struct clk_hw *hw)
248 {
249 struct si5351_driver_data *drvdata =
250 container_of(hw, struct si5351_driver_data, clkin);
251 si5351_set_bits(drvdata, SI5351_FANOUT_ENABLE,
252 SI5351_CLKIN_ENABLE, SI5351_CLKIN_ENABLE);
253 return 0;
254 }
255
256 static void si5351_clkin_unprepare(struct clk_hw *hw)
257 {
258 struct si5351_driver_data *drvdata =
259 container_of(hw, struct si5351_driver_data, clkin);
260 si5351_set_bits(drvdata, SI5351_FANOUT_ENABLE,
261 SI5351_CLKIN_ENABLE, 0);
262 }
263
264 /*
265 * CMOS clock source constraints:
266 * The input frequency range of the PLL is 10Mhz to 40MHz.
267 * If CLKIN is >40MHz, the input divider must be used.
268 */
269 static unsigned long si5351_clkin_recalc_rate(struct clk_hw *hw,
270 unsigned long parent_rate)
271 {
272 struct si5351_driver_data *drvdata =
273 container_of(hw, struct si5351_driver_data, clkin);
274 unsigned long rate;
275 unsigned char idiv;
276
277 rate = parent_rate;
278 if (parent_rate > 160000000) {
279 idiv = SI5351_CLKIN_DIV_8;
280 rate /= 8;
281 } else if (parent_rate > 80000000) {
282 idiv = SI5351_CLKIN_DIV_4;
283 rate /= 4;
284 } else if (parent_rate > 40000000) {
285 idiv = SI5351_CLKIN_DIV_2;
286 rate /= 2;
287 } else {
288 idiv = SI5351_CLKIN_DIV_1;
289 }
290
291 si5351_set_bits(drvdata, SI5351_PLL_INPUT_SOURCE,
292 SI5351_CLKIN_DIV_MASK, idiv);
293
294 dev_dbg(&drvdata->client->dev, "%s - clkin div = %d, rate = %lu\n",
295 __func__, (1 << (idiv >> 6)), rate);
296
297 return rate;
298 }
299
300 static const struct clk_ops si5351_clkin_ops = {
301 .prepare = si5351_clkin_prepare,
302 .unprepare = si5351_clkin_unprepare,
303 .recalc_rate = si5351_clkin_recalc_rate,
304 };
305
306 /*
307 * Si5351 vxco clock input (Si5351B only)
308 */
309
310 static int si5351_vxco_prepare(struct clk_hw *hw)
311 {
312 struct si5351_hw_data *hwdata =
313 container_of(hw, struct si5351_hw_data, hw);
314
315 dev_warn(&hwdata->drvdata->client->dev, "VXCO currently unsupported\n");
316
317 return 0;
318 }
319
320 static void si5351_vxco_unprepare(struct clk_hw *hw)
321 {
322 }
323
324 static unsigned long si5351_vxco_recalc_rate(struct clk_hw *hw,
325 unsigned long parent_rate)
326 {
327 return 0;
328 }
329
330 static int si5351_vxco_set_rate(struct clk_hw *hw, unsigned long rate,
331 unsigned long parent)
332 {
333 return 0;
334 }
335
336 static const struct clk_ops si5351_vxco_ops = {
337 .prepare = si5351_vxco_prepare,
338 .unprepare = si5351_vxco_unprepare,
339 .recalc_rate = si5351_vxco_recalc_rate,
340 .set_rate = si5351_vxco_set_rate,
341 };
342
343 /*
344 * Si5351 pll a/b
345 *
346 * Feedback Multisynth Divider Equations [2]
347 *
348 * fVCO = fIN * (a + b/c)
349 *
350 * with 15 + 0/1048575 <= (a + b/c) <= 90 + 0/1048575 and
351 * fIN = fXTAL or fIN = fCLKIN/CLKIN_DIV
352 *
353 * Feedback Multisynth Register Equations
354 *
355 * (1) MSNx_P1[17:0] = 128 * a + floor(128 * b/c) - 512
356 * (2) MSNx_P2[19:0] = 128 * b - c * floor(128 * b/c) = (128*b) mod c
357 * (3) MSNx_P3[19:0] = c
358 *
359 * Transposing (2) yields: (4) floor(128 * b/c) = (128 * b / MSNx_P2)/c
360 *
361 * Using (4) on (1) yields:
362 * MSNx_P1 = 128 * a + (128 * b/MSNx_P2)/c - 512
363 * MSNx_P1 + 512 + MSNx_P2/c = 128 * a + 128 * b/c
364 *
365 * a + b/c = (MSNx_P1 + MSNx_P2/MSNx_P3 + 512)/128
366 * = (MSNx_P1*MSNx_P3 + MSNx_P2 + 512*MSNx_P3)/(128*MSNx_P3)
367 *
368 */
369 static int _si5351_pll_reparent(struct si5351_driver_data *drvdata,
370 int num, enum si5351_pll_src parent)
371 {
372 u8 mask = (num == 0) ? SI5351_PLLA_SOURCE : SI5351_PLLB_SOURCE;
373
374 if (parent == SI5351_PLL_SRC_DEFAULT)
375 return 0;
376
377 if (num > 2)
378 return -EINVAL;
379
380 if (drvdata->variant != SI5351_VARIANT_C &&
381 parent != SI5351_PLL_SRC_XTAL)
382 return -EINVAL;
383
384 si5351_set_bits(drvdata, SI5351_PLL_INPUT_SOURCE, mask,
385 (parent == SI5351_PLL_SRC_XTAL) ? 0 : mask);
386 return 0;
387 }
388
389 static unsigned char si5351_pll_get_parent(struct clk_hw *hw)
390 {
391 struct si5351_hw_data *hwdata =
392 container_of(hw, struct si5351_hw_data, hw);
393 u8 mask = (hwdata->num == 0) ? SI5351_PLLA_SOURCE : SI5351_PLLB_SOURCE;
394 u8 val;
395
396 val = si5351_reg_read(hwdata->drvdata, SI5351_PLL_INPUT_SOURCE);
397
398 return (val & mask) ? 1 : 0;
399 }
400
401 static int si5351_pll_set_parent(struct clk_hw *hw, u8 index)
402 {
403 struct si5351_hw_data *hwdata =
404 container_of(hw, struct si5351_hw_data, hw);
405
406 if (hwdata->drvdata->variant != SI5351_VARIANT_C &&
407 index > 0)
408 return -EPERM;
409
410 if (index > 1)
411 return -EINVAL;
412
413 return _si5351_pll_reparent(hwdata->drvdata, hwdata->num,
414 (index == 0) ? SI5351_PLL_SRC_XTAL :
415 SI5351_PLL_SRC_CLKIN);
416 }
417
418 static unsigned long si5351_pll_recalc_rate(struct clk_hw *hw,
419 unsigned long parent_rate)
420 {
421 struct si5351_hw_data *hwdata =
422 container_of(hw, struct si5351_hw_data, hw);
423 u8 reg = (hwdata->num == 0) ? SI5351_PLLA_PARAMETERS :
424 SI5351_PLLB_PARAMETERS;
425 unsigned long long rate;
426
427 if (!hwdata->params.valid)
428 si5351_read_parameters(hwdata->drvdata, reg, &hwdata->params);
429
430 if (hwdata->params.p3 == 0)
431 return parent_rate;
432
433 /* fVCO = fIN * (P1*P3 + 512*P3 + P2)/(128*P3) */
434 rate = hwdata->params.p1 * hwdata->params.p3;
435 rate += 512 * hwdata->params.p3;
436 rate += hwdata->params.p2;
437 rate *= parent_rate;
438 do_div(rate, 128 * hwdata->params.p3);
439
440 dev_dbg(&hwdata->drvdata->client->dev,
441 "%s - %s: p1 = %lu, p2 = %lu, p3 = %lu, parent_rate = %lu, rate = %lu\n",
442 __func__, clk_hw_get_name(hw),
443 hwdata->params.p1, hwdata->params.p2, hwdata->params.p3,
444 parent_rate, (unsigned long)rate);
445
446 return (unsigned long)rate;
447 }
448
449 static long si5351_pll_round_rate(struct clk_hw *hw, unsigned long rate,
450 unsigned long *parent_rate)
451 {
452 struct si5351_hw_data *hwdata =
453 container_of(hw, struct si5351_hw_data, hw);
454 unsigned long rfrac, denom, a, b, c;
455 unsigned long long lltmp;
456
457 if (rate < SI5351_PLL_VCO_MIN)
458 rate = SI5351_PLL_VCO_MIN;
459 if (rate > SI5351_PLL_VCO_MAX)
460 rate = SI5351_PLL_VCO_MAX;
461
462 /* determine integer part of feedback equation */
463 a = rate / *parent_rate;
464
465 if (a < SI5351_PLL_A_MIN)
466 rate = *parent_rate * SI5351_PLL_A_MIN;
467 if (a > SI5351_PLL_A_MAX)
468 rate = *parent_rate * SI5351_PLL_A_MAX;
469
470 /* find best approximation for b/c = fVCO mod fIN */
471 denom = 1000 * 1000;
472 lltmp = rate % (*parent_rate);
473 lltmp *= denom;
474 do_div(lltmp, *parent_rate);
475 rfrac = (unsigned long)lltmp;
476
477 b = 0;
478 c = 1;
479 if (rfrac)
480 rational_best_approximation(rfrac, denom,
481 SI5351_PLL_B_MAX, SI5351_PLL_C_MAX, &b, &c);
482
483 /* calculate parameters */
484 hwdata->params.p3 = c;
485 hwdata->params.p2 = (128 * b) % c;
486 hwdata->params.p1 = 128 * a;
487 hwdata->params.p1 += (128 * b / c);
488 hwdata->params.p1 -= 512;
489
490 /* recalculate rate by fIN * (a + b/c) */
491 lltmp = *parent_rate;
492 lltmp *= b;
493 do_div(lltmp, c);
494
495 rate = (unsigned long)lltmp;
496 rate += *parent_rate * a;
497
498 dev_dbg(&hwdata->drvdata->client->dev,
499 "%s - %s: a = %lu, b = %lu, c = %lu, parent_rate = %lu, rate = %lu\n",
500 __func__, clk_hw_get_name(hw), a, b, c,
501 *parent_rate, rate);
502
503 return rate;
504 }
505
506 static int si5351_pll_set_rate(struct clk_hw *hw, unsigned long rate,
507 unsigned long parent_rate)
508 {
509 struct si5351_hw_data *hwdata =
510 container_of(hw, struct si5351_hw_data, hw);
511 u8 reg = (hwdata->num == 0) ? SI5351_PLLA_PARAMETERS :
512 SI5351_PLLB_PARAMETERS;
513
514 /* write multisynth parameters */
515 si5351_write_parameters(hwdata->drvdata, reg, &hwdata->params);
516
517 /* plla/pllb ctrl is in clk6/clk7 ctrl registers */
518 si5351_set_bits(hwdata->drvdata, SI5351_CLK6_CTRL + hwdata->num,
519 SI5351_CLK_INTEGER_MODE,
520 (hwdata->params.p2 == 0) ? SI5351_CLK_INTEGER_MODE : 0);
521
522 /* Do a pll soft reset on the affected pll */
523 si5351_reg_write(hwdata->drvdata, SI5351_PLL_RESET,
524 hwdata->num == 0 ? SI5351_PLL_RESET_A :
525 SI5351_PLL_RESET_B);
526
527 dev_dbg(&hwdata->drvdata->client->dev,
528 "%s - %s: p1 = %lu, p2 = %lu, p3 = %lu, parent_rate = %lu, rate = %lu\n",
529 __func__, clk_hw_get_name(hw),
530 hwdata->params.p1, hwdata->params.p2, hwdata->params.p3,
531 parent_rate, rate);
532
533 return 0;
534 }
535
536 static const struct clk_ops si5351_pll_ops = {
537 .set_parent = si5351_pll_set_parent,
538 .get_parent = si5351_pll_get_parent,
539 .recalc_rate = si5351_pll_recalc_rate,
540 .round_rate = si5351_pll_round_rate,
541 .set_rate = si5351_pll_set_rate,
542 };
543
544 /*
545 * Si5351 multisync divider
546 *
547 * for fOUT <= 150 MHz:
548 *
549 * fOUT = (fIN * (a + b/c)) / CLKOUTDIV
550 *
551 * with 6 + 0/1048575 <= (a + b/c) <= 1800 + 0/1048575 and
552 * fIN = fVCO0, fVCO1
553 *
554 * Output Clock Multisynth Register Equations
555 *
556 * MSx_P1[17:0] = 128 * a + floor(128 * b/c) - 512
557 * MSx_P2[19:0] = 128 * b - c * floor(128 * b/c) = (128*b) mod c
558 * MSx_P3[19:0] = c
559 *
560 * MS[6,7] are integer (P1) divide only, P1 = divide value,
561 * P2 and P3 are not applicable
562 *
563 * for 150MHz < fOUT <= 160MHz:
564 *
565 * MSx_P1 = 0, MSx_P2 = 0, MSx_P3 = 1, MSx_INT = 1, MSx_DIVBY4 = 11b
566 */
567 static int _si5351_msynth_reparent(struct si5351_driver_data *drvdata,
568 int num, enum si5351_multisynth_src parent)
569 {
570 if (parent == SI5351_MULTISYNTH_SRC_DEFAULT)
571 return 0;
572
573 if (num > 8)
574 return -EINVAL;
575
576 si5351_set_bits(drvdata, SI5351_CLK0_CTRL + num, SI5351_CLK_PLL_SELECT,
577 (parent == SI5351_MULTISYNTH_SRC_VCO0) ? 0 :
578 SI5351_CLK_PLL_SELECT);
579 return 0;
580 }
581
582 static unsigned char si5351_msynth_get_parent(struct clk_hw *hw)
583 {
584 struct si5351_hw_data *hwdata =
585 container_of(hw, struct si5351_hw_data, hw);
586 u8 val;
587
588 val = si5351_reg_read(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num);
589
590 return (val & SI5351_CLK_PLL_SELECT) ? 1 : 0;
591 }
592
593 static int si5351_msynth_set_parent(struct clk_hw *hw, u8 index)
594 {
595 struct si5351_hw_data *hwdata =
596 container_of(hw, struct si5351_hw_data, hw);
597
598 return _si5351_msynth_reparent(hwdata->drvdata, hwdata->num,
599 (index == 0) ? SI5351_MULTISYNTH_SRC_VCO0 :
600 SI5351_MULTISYNTH_SRC_VCO1);
601 }
602
603 static unsigned long si5351_msynth_recalc_rate(struct clk_hw *hw,
604 unsigned long parent_rate)
605 {
606 struct si5351_hw_data *hwdata =
607 container_of(hw, struct si5351_hw_data, hw);
608 u8 reg = si5351_msynth_params_address(hwdata->num);
609 unsigned long long rate;
610 unsigned long m;
611
612 if (!hwdata->params.valid)
613 si5351_read_parameters(hwdata->drvdata, reg, &hwdata->params);
614
615 /*
616 * multisync0-5: fOUT = (128 * P3 * fIN) / (P1*P3 + P2 + 512*P3)
617 * multisync6-7: fOUT = fIN / P1
618 */
619 rate = parent_rate;
620 if (hwdata->num > 5) {
621 m = hwdata->params.p1;
622 } else if (hwdata->params.p3 == 0) {
623 return parent_rate;
624 } else if ((si5351_reg_read(hwdata->drvdata, reg + 2) &
625 SI5351_OUTPUT_CLK_DIVBY4) == SI5351_OUTPUT_CLK_DIVBY4) {
626 m = 4;
627 } else {
628 rate *= 128 * hwdata->params.p3;
629 m = hwdata->params.p1 * hwdata->params.p3;
630 m += hwdata->params.p2;
631 m += 512 * hwdata->params.p3;
632 }
633
634 if (m == 0)
635 return 0;
636 do_div(rate, m);
637
638 dev_dbg(&hwdata->drvdata->client->dev,
639 "%s - %s: p1 = %lu, p2 = %lu, p3 = %lu, m = %lu, parent_rate = %lu, rate = %lu\n",
640 __func__, clk_hw_get_name(hw),
641 hwdata->params.p1, hwdata->params.p2, hwdata->params.p3,
642 m, parent_rate, (unsigned long)rate);
643
644 return (unsigned long)rate;
645 }
646
647 static long si5351_msynth_round_rate(struct clk_hw *hw, unsigned long rate,
648 unsigned long *parent_rate)
649 {
650 struct si5351_hw_data *hwdata =
651 container_of(hw, struct si5351_hw_data, hw);
652 unsigned long long lltmp;
653 unsigned long a, b, c;
654 int divby4;
655
656 /* multisync6-7 can only handle freqencies < 150MHz */
657 if (hwdata->num >= 6 && rate > SI5351_MULTISYNTH67_MAX_FREQ)
658 rate = SI5351_MULTISYNTH67_MAX_FREQ;
659
660 /* multisync frequency is 1MHz .. 160MHz */
661 if (rate > SI5351_MULTISYNTH_MAX_FREQ)
662 rate = SI5351_MULTISYNTH_MAX_FREQ;
663 if (rate < SI5351_MULTISYNTH_MIN_FREQ)
664 rate = SI5351_MULTISYNTH_MIN_FREQ;
665
666 divby4 = 0;
667 if (rate > SI5351_MULTISYNTH_DIVBY4_FREQ)
668 divby4 = 1;
669
670 /* multisync can set pll */
671 if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) {
672 /*
673 * find largest integer divider for max
674 * vco frequency and given target rate
675 */
676 if (divby4 == 0) {
677 lltmp = SI5351_PLL_VCO_MAX;
678 do_div(lltmp, rate);
679 a = (unsigned long)lltmp;
680 } else
681 a = 4;
682
683 b = 0;
684 c = 1;
685
686 *parent_rate = a * rate;
687 } else if (hwdata->num >= 6) {
688 /* determine the closest integer divider */
689 a = DIV_ROUND_CLOSEST(*parent_rate, rate);
690 if (a < SI5351_MULTISYNTH_A_MIN)
691 a = SI5351_MULTISYNTH_A_MIN;
692 if (a > SI5351_MULTISYNTH67_A_MAX)
693 a = SI5351_MULTISYNTH67_A_MAX;
694
695 b = 0;
696 c = 1;
697 } else {
698 unsigned long rfrac, denom;
699
700 /* disable divby4 */
701 if (divby4) {
702 rate = SI5351_MULTISYNTH_DIVBY4_FREQ;
703 divby4 = 0;
704 }
705
706 /* determine integer part of divider equation */
707 a = *parent_rate / rate;
708 if (a < SI5351_MULTISYNTH_A_MIN)
709 a = SI5351_MULTISYNTH_A_MIN;
710 if (a > SI5351_MULTISYNTH_A_MAX)
711 a = SI5351_MULTISYNTH_A_MAX;
712
713 /* find best approximation for b/c = fVCO mod fOUT */
714 denom = 1000 * 1000;
715 lltmp = (*parent_rate) % rate;
716 lltmp *= denom;
717 do_div(lltmp, rate);
718 rfrac = (unsigned long)lltmp;
719
720 b = 0;
721 c = 1;
722 if (rfrac)
723 rational_best_approximation(rfrac, denom,
724 SI5351_MULTISYNTH_B_MAX, SI5351_MULTISYNTH_C_MAX,
725 &b, &c);
726 }
727
728 /* recalculate rate by fOUT = fIN / (a + b/c) */
729 lltmp = *parent_rate;
730 lltmp *= c;
731 do_div(lltmp, a * c + b);
732 rate = (unsigned long)lltmp;
733
734 /* calculate parameters */
735 if (divby4) {
736 hwdata->params.p3 = 1;
737 hwdata->params.p2 = 0;
738 hwdata->params.p1 = 0;
739 } else if (hwdata->num >= 6) {
740 hwdata->params.p3 = 0;
741 hwdata->params.p2 = 0;
742 hwdata->params.p1 = a;
743 } else {
744 hwdata->params.p3 = c;
745 hwdata->params.p2 = (128 * b) % c;
746 hwdata->params.p1 = 128 * a;
747 hwdata->params.p1 += (128 * b / c);
748 hwdata->params.p1 -= 512;
749 }
750
751 dev_dbg(&hwdata->drvdata->client->dev,
752 "%s - %s: a = %lu, b = %lu, c = %lu, divby4 = %d, parent_rate = %lu, rate = %lu\n",
753 __func__, clk_hw_get_name(hw), a, b, c, divby4,
754 *parent_rate, rate);
755
756 return rate;
757 }
758
759 static int si5351_msynth_set_rate(struct clk_hw *hw, unsigned long rate,
760 unsigned long parent_rate)
761 {
762 struct si5351_hw_data *hwdata =
763 container_of(hw, struct si5351_hw_data, hw);
764 u8 reg = si5351_msynth_params_address(hwdata->num);
765 int divby4 = 0;
766
767 /* write multisynth parameters */
768 si5351_write_parameters(hwdata->drvdata, reg, &hwdata->params);
769
770 if (rate > SI5351_MULTISYNTH_DIVBY4_FREQ)
771 divby4 = 1;
772
773 /* enable/disable integer mode and divby4 on multisynth0-5 */
774 if (hwdata->num < 6) {
775 si5351_set_bits(hwdata->drvdata, reg + 2,
776 SI5351_OUTPUT_CLK_DIVBY4,
777 (divby4) ? SI5351_OUTPUT_CLK_DIVBY4 : 0);
778 si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num,
779 SI5351_CLK_INTEGER_MODE,
780 (hwdata->params.p2 == 0) ? SI5351_CLK_INTEGER_MODE : 0);
781 }
782
783 dev_dbg(&hwdata->drvdata->client->dev,
784 "%s - %s: p1 = %lu, p2 = %lu, p3 = %lu, divby4 = %d, parent_rate = %lu, rate = %lu\n",
785 __func__, clk_hw_get_name(hw),
786 hwdata->params.p1, hwdata->params.p2, hwdata->params.p3,
787 divby4, parent_rate, rate);
788
789 return 0;
790 }
791
792 static const struct clk_ops si5351_msynth_ops = {
793 .set_parent = si5351_msynth_set_parent,
794 .get_parent = si5351_msynth_get_parent,
795 .recalc_rate = si5351_msynth_recalc_rate,
796 .round_rate = si5351_msynth_round_rate,
797 .set_rate = si5351_msynth_set_rate,
798 };
799
800 /*
801 * Si5351 clkout divider
802 */
803 static int _si5351_clkout_reparent(struct si5351_driver_data *drvdata,
804 int num, enum si5351_clkout_src parent)
805 {
806 u8 val;
807
808 if (num > 8)
809 return -EINVAL;
810
811 switch (parent) {
812 case SI5351_CLKOUT_SRC_MSYNTH_N:
813 val = SI5351_CLK_INPUT_MULTISYNTH_N;
814 break;
815 case SI5351_CLKOUT_SRC_MSYNTH_0_4:
816 /* clk0/clk4 can only connect to its own multisync */
817 if (num == 0 || num == 4)
818 val = SI5351_CLK_INPUT_MULTISYNTH_N;
819 else
820 val = SI5351_CLK_INPUT_MULTISYNTH_0_4;
821 break;
822 case SI5351_CLKOUT_SRC_XTAL:
823 val = SI5351_CLK_INPUT_XTAL;
824 break;
825 case SI5351_CLKOUT_SRC_CLKIN:
826 if (drvdata->variant != SI5351_VARIANT_C)
827 return -EINVAL;
828
829 val = SI5351_CLK_INPUT_CLKIN;
830 break;
831 default:
832 return 0;
833 }
834
835 si5351_set_bits(drvdata, SI5351_CLK0_CTRL + num,
836 SI5351_CLK_INPUT_MASK, val);
837 return 0;
838 }
839
840 static int _si5351_clkout_set_drive_strength(
841 struct si5351_driver_data *drvdata, int num,
842 enum si5351_drive_strength drive)
843 {
844 u8 mask;
845
846 if (num > 8)
847 return -EINVAL;
848
849 switch (drive) {
850 case SI5351_DRIVE_2MA:
851 mask = SI5351_CLK_DRIVE_STRENGTH_2MA;
852 break;
853 case SI5351_DRIVE_4MA:
854 mask = SI5351_CLK_DRIVE_STRENGTH_4MA;
855 break;
856 case SI5351_DRIVE_6MA:
857 mask = SI5351_CLK_DRIVE_STRENGTH_6MA;
858 break;
859 case SI5351_DRIVE_8MA:
860 mask = SI5351_CLK_DRIVE_STRENGTH_8MA;
861 break;
862 default:
863 return 0;
864 }
865
866 si5351_set_bits(drvdata, SI5351_CLK0_CTRL + num,
867 SI5351_CLK_DRIVE_STRENGTH_MASK, mask);
868 return 0;
869 }
870
871 static int _si5351_clkout_set_disable_state(
872 struct si5351_driver_data *drvdata, int num,
873 enum si5351_disable_state state)
874 {
875 u8 reg = (num < 4) ? SI5351_CLK3_0_DISABLE_STATE :
876 SI5351_CLK7_4_DISABLE_STATE;
877 u8 shift = (num < 4) ? (2 * num) : (2 * (num-4));
878 u8 mask = SI5351_CLK_DISABLE_STATE_MASK << shift;
879 u8 val;
880
881 if (num > 8)
882 return -EINVAL;
883
884 switch (state) {
885 case SI5351_DISABLE_LOW:
886 val = SI5351_CLK_DISABLE_STATE_LOW;
887 break;
888 case SI5351_DISABLE_HIGH:
889 val = SI5351_CLK_DISABLE_STATE_HIGH;
890 break;
891 case SI5351_DISABLE_FLOATING:
892 val = SI5351_CLK_DISABLE_STATE_FLOAT;
893 break;
894 case SI5351_DISABLE_NEVER:
895 val = SI5351_CLK_DISABLE_STATE_NEVER;
896 break;
897 default:
898 return 0;
899 }
900
901 si5351_set_bits(drvdata, reg, mask, val << shift);
902
903 return 0;
904 }
905
906 static void _si5351_clkout_reset_pll(struct si5351_driver_data *drvdata, int num)
907 {
908 u8 val = si5351_reg_read(drvdata, SI5351_CLK0_CTRL + num);
909
910 switch (val & SI5351_CLK_INPUT_MASK) {
911 case SI5351_CLK_INPUT_XTAL:
912 case SI5351_CLK_INPUT_CLKIN:
913 return; /* pll not used, no need to reset */
914 }
915
916 si5351_reg_write(drvdata, SI5351_PLL_RESET,
917 val & SI5351_CLK_PLL_SELECT ? SI5351_PLL_RESET_B :
918 SI5351_PLL_RESET_A);
919
920 dev_dbg(&drvdata->client->dev, "%s - %s: pll = %d\n",
921 __func__, clk_hw_get_name(&drvdata->clkout[num].hw),
922 (val & SI5351_CLK_PLL_SELECT) ? 1 : 0);
923 }
924
925 static int si5351_clkout_prepare(struct clk_hw *hw)
926 {
927 struct si5351_hw_data *hwdata =
928 container_of(hw, struct si5351_hw_data, hw);
929 struct si5351_platform_data *pdata =
930 hwdata->drvdata->client->dev.platform_data;
931
932 si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num,
933 SI5351_CLK_POWERDOWN, 0);
934
935 /*
936 * Do a pll soft reset on the parent pll -- needed to get a
937 * deterministic phase relationship between the output clocks.
938 */
939 if (pdata->clkout[hwdata->num].pll_reset)
940 _si5351_clkout_reset_pll(hwdata->drvdata, hwdata->num);
941
942 si5351_set_bits(hwdata->drvdata, SI5351_OUTPUT_ENABLE_CTRL,
943 (1 << hwdata->num), 0);
944 return 0;
945 }
946
947 static void si5351_clkout_unprepare(struct clk_hw *hw)
948 {
949 struct si5351_hw_data *hwdata =
950 container_of(hw, struct si5351_hw_data, hw);
951
952 si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num,
953 SI5351_CLK_POWERDOWN, SI5351_CLK_POWERDOWN);
954 si5351_set_bits(hwdata->drvdata, SI5351_OUTPUT_ENABLE_CTRL,
955 (1 << hwdata->num), (1 << hwdata->num));
956 }
957
958 static u8 si5351_clkout_get_parent(struct clk_hw *hw)
959 {
960 struct si5351_hw_data *hwdata =
961 container_of(hw, struct si5351_hw_data, hw);
962 int index = 0;
963 unsigned char val;
964
965 val = si5351_reg_read(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num);
966 switch (val & SI5351_CLK_INPUT_MASK) {
967 case SI5351_CLK_INPUT_MULTISYNTH_N:
968 index = 0;
969 break;
970 case SI5351_CLK_INPUT_MULTISYNTH_0_4:
971 index = 1;
972 break;
973 case SI5351_CLK_INPUT_XTAL:
974 index = 2;
975 break;
976 case SI5351_CLK_INPUT_CLKIN:
977 index = 3;
978 break;
979 }
980
981 return index;
982 }
983
984 static int si5351_clkout_set_parent(struct clk_hw *hw, u8 index)
985 {
986 struct si5351_hw_data *hwdata =
987 container_of(hw, struct si5351_hw_data, hw);
988 enum si5351_clkout_src parent = SI5351_CLKOUT_SRC_DEFAULT;
989
990 switch (index) {
991 case 0:
992 parent = SI5351_CLKOUT_SRC_MSYNTH_N;
993 break;
994 case 1:
995 parent = SI5351_CLKOUT_SRC_MSYNTH_0_4;
996 break;
997 case 2:
998 parent = SI5351_CLKOUT_SRC_XTAL;
999 break;
1000 case 3:
1001 parent = SI5351_CLKOUT_SRC_CLKIN;
1002 break;
1003 }
1004
1005 return _si5351_clkout_reparent(hwdata->drvdata, hwdata->num, parent);
1006 }
1007
1008 static unsigned long si5351_clkout_recalc_rate(struct clk_hw *hw,
1009 unsigned long parent_rate)
1010 {
1011 struct si5351_hw_data *hwdata =
1012 container_of(hw, struct si5351_hw_data, hw);
1013 unsigned char reg;
1014 unsigned char rdiv;
1015
1016 if (hwdata->num <= 5)
1017 reg = si5351_msynth_params_address(hwdata->num) + 2;
1018 else
1019 reg = SI5351_CLK6_7_OUTPUT_DIVIDER;
1020
1021 rdiv = si5351_reg_read(hwdata->drvdata, reg);
1022 if (hwdata->num == 6) {
1023 rdiv &= SI5351_OUTPUT_CLK6_DIV_MASK;
1024 } else {
1025 rdiv &= SI5351_OUTPUT_CLK_DIV_MASK;
1026 rdiv >>= SI5351_OUTPUT_CLK_DIV_SHIFT;
1027 }
1028
1029 return parent_rate >> rdiv;
1030 }
1031
1032 static long si5351_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
1033 unsigned long *parent_rate)
1034 {
1035 struct si5351_hw_data *hwdata =
1036 container_of(hw, struct si5351_hw_data, hw);
1037 unsigned char rdiv;
1038
1039 /* clkout6/7 can only handle output freqencies < 150MHz */
1040 if (hwdata->num >= 6 && rate > SI5351_CLKOUT67_MAX_FREQ)
1041 rate = SI5351_CLKOUT67_MAX_FREQ;
1042
1043 /* clkout freqency is 8kHz - 160MHz */
1044 if (rate > SI5351_CLKOUT_MAX_FREQ)
1045 rate = SI5351_CLKOUT_MAX_FREQ;
1046 if (rate < SI5351_CLKOUT_MIN_FREQ)
1047 rate = SI5351_CLKOUT_MIN_FREQ;
1048
1049 /* request frequency if multisync master */
1050 if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) {
1051 /* use r divider for frequencies below 1MHz */
1052 rdiv = SI5351_OUTPUT_CLK_DIV_1;
1053 while (rate < SI5351_MULTISYNTH_MIN_FREQ &&
1054 rdiv < SI5351_OUTPUT_CLK_DIV_128) {
1055 rdiv += 1;
1056 rate *= 2;
1057 }
1058 *parent_rate = rate;
1059 } else {
1060 unsigned long new_rate, new_err, err;
1061
1062 /* round to closed rdiv */
1063 rdiv = SI5351_OUTPUT_CLK_DIV_1;
1064 new_rate = *parent_rate;
1065 err = abs(new_rate - rate);
1066 do {
1067 new_rate >>= 1;
1068 new_err = abs(new_rate - rate);
1069 if (new_err > err || rdiv == SI5351_OUTPUT_CLK_DIV_128)
1070 break;
1071 rdiv++;
1072 err = new_err;
1073 } while (1);
1074 }
1075 rate = *parent_rate >> rdiv;
1076
1077 dev_dbg(&hwdata->drvdata->client->dev,
1078 "%s - %s: rdiv = %u, parent_rate = %lu, rate = %lu\n",
1079 __func__, clk_hw_get_name(hw), (1 << rdiv),
1080 *parent_rate, rate);
1081
1082 return rate;
1083 }
1084
1085 static int si5351_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
1086 unsigned long parent_rate)
1087 {
1088 struct si5351_hw_data *hwdata =
1089 container_of(hw, struct si5351_hw_data, hw);
1090 unsigned long new_rate, new_err, err;
1091 unsigned char rdiv;
1092
1093 /* round to closed rdiv */
1094 rdiv = SI5351_OUTPUT_CLK_DIV_1;
1095 new_rate = parent_rate;
1096 err = abs(new_rate - rate);
1097 do {
1098 new_rate >>= 1;
1099 new_err = abs(new_rate - rate);
1100 if (new_err > err || rdiv == SI5351_OUTPUT_CLK_DIV_128)
1101 break;
1102 rdiv++;
1103 err = new_err;
1104 } while (1);
1105
1106 /* write output divider */
1107 switch (hwdata->num) {
1108 case 6:
1109 si5351_set_bits(hwdata->drvdata, SI5351_CLK6_7_OUTPUT_DIVIDER,
1110 SI5351_OUTPUT_CLK6_DIV_MASK, rdiv);
1111 break;
1112 case 7:
1113 si5351_set_bits(hwdata->drvdata, SI5351_CLK6_7_OUTPUT_DIVIDER,
1114 SI5351_OUTPUT_CLK_DIV_MASK,
1115 rdiv << SI5351_OUTPUT_CLK_DIV_SHIFT);
1116 break;
1117 default:
1118 si5351_set_bits(hwdata->drvdata,
1119 si5351_msynth_params_address(hwdata->num) + 2,
1120 SI5351_OUTPUT_CLK_DIV_MASK,
1121 rdiv << SI5351_OUTPUT_CLK_DIV_SHIFT);
1122 }
1123
1124 /* powerup clkout */
1125 si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num,
1126 SI5351_CLK_POWERDOWN, 0);
1127
1128 dev_dbg(&hwdata->drvdata->client->dev,
1129 "%s - %s: rdiv = %u, parent_rate = %lu, rate = %lu\n",
1130 __func__, clk_hw_get_name(hw), (1 << rdiv),
1131 parent_rate, rate);
1132
1133 return 0;
1134 }
1135
1136 static const struct clk_ops si5351_clkout_ops = {
1137 .prepare = si5351_clkout_prepare,
1138 .unprepare = si5351_clkout_unprepare,
1139 .set_parent = si5351_clkout_set_parent,
1140 .get_parent = si5351_clkout_get_parent,
1141 .recalc_rate = si5351_clkout_recalc_rate,
1142 .round_rate = si5351_clkout_round_rate,
1143 .set_rate = si5351_clkout_set_rate,
1144 };
1145
1146 /*
1147 * Si5351 i2c probe and DT
1148 */
1149 #ifdef CONFIG_OF
1150 static const struct of_device_id si5351_dt_ids[] = {
1151 { .compatible = "silabs,si5351a", .data = (void *)SI5351_VARIANT_A, },
1152 { .compatible = "silabs,si5351a-msop",
1153 .data = (void *)SI5351_VARIANT_A3, },
1154 { .compatible = "silabs,si5351b", .data = (void *)SI5351_VARIANT_B, },
1155 { .compatible = "silabs,si5351c", .data = (void *)SI5351_VARIANT_C, },
1156 { }
1157 };
1158 MODULE_DEVICE_TABLE(of, si5351_dt_ids);
1159
1160 static int si5351_dt_parse(struct i2c_client *client,
1161 enum si5351_variant variant)
1162 {
1163 struct device_node *child, *np = client->dev.of_node;
1164 struct si5351_platform_data *pdata;
1165 struct property *prop;
1166 const __be32 *p;
1167 int num = 0;
1168 u32 val;
1169
1170 if (np == NULL)
1171 return 0;
1172
1173 pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
1174 if (!pdata)
1175 return -ENOMEM;
1176
1177 /*
1178 * property silabs,pll-source : <num src>, [<..>]
1179 * allow to selectively set pll source
1180 */
1181 of_property_for_each_u32(np, "silabs,pll-source", prop, p, num) {
1182 if (num >= 2) {
1183 dev_err(&client->dev,
1184 "invalid pll %d on pll-source prop\n", num);
1185 return -EINVAL;
1186 }
1187
1188 p = of_prop_next_u32(prop, p, &val);
1189 if (!p) {
1190 dev_err(&client->dev,
1191 "missing pll-source for pll %d\n", num);
1192 return -EINVAL;
1193 }
1194
1195 switch (val) {
1196 case 0:
1197 pdata->pll_src[num] = SI5351_PLL_SRC_XTAL;
1198 break;
1199 case 1:
1200 if (variant != SI5351_VARIANT_C) {
1201 dev_err(&client->dev,
1202 "invalid parent %d for pll %d\n",
1203 val, num);
1204 return -EINVAL;
1205 }
1206 pdata->pll_src[num] = SI5351_PLL_SRC_CLKIN;
1207 break;
1208 default:
1209 dev_err(&client->dev,
1210 "invalid parent %d for pll %d\n", val, num);
1211 return -EINVAL;
1212 }
1213 }
1214
1215 /* per clkout properties */
1216 for_each_child_of_node(np, child) {
1217 if (of_property_read_u32(child, "reg", &num)) {
1218 dev_err(&client->dev, "missing reg property of %s\n",
1219 child->name);
1220 goto put_child;
1221 }
1222
1223 if (num >= 8 ||
1224 (variant == SI5351_VARIANT_A3 && num >= 3)) {
1225 dev_err(&client->dev, "invalid clkout %d\n", num);
1226 goto put_child;
1227 }
1228
1229 if (!of_property_read_u32(child, "silabs,multisynth-source",
1230 &val)) {
1231 switch (val) {
1232 case 0:
1233 pdata->clkout[num].multisynth_src =
1234 SI5351_MULTISYNTH_SRC_VCO0;
1235 break;
1236 case 1:
1237 pdata->clkout[num].multisynth_src =
1238 SI5351_MULTISYNTH_SRC_VCO1;
1239 break;
1240 default:
1241 dev_err(&client->dev,
1242 "invalid parent %d for multisynth %d\n",
1243 val, num);
1244 goto put_child;
1245 }
1246 }
1247
1248 if (!of_property_read_u32(child, "silabs,clock-source", &val)) {
1249 switch (val) {
1250 case 0:
1251 pdata->clkout[num].clkout_src =
1252 SI5351_CLKOUT_SRC_MSYNTH_N;
1253 break;
1254 case 1:
1255 pdata->clkout[num].clkout_src =
1256 SI5351_CLKOUT_SRC_MSYNTH_0_4;
1257 break;
1258 case 2:
1259 pdata->clkout[num].clkout_src =
1260 SI5351_CLKOUT_SRC_XTAL;
1261 break;
1262 case 3:
1263 if (variant != SI5351_VARIANT_C) {
1264 dev_err(&client->dev,
1265 "invalid parent %d for clkout %d\n",
1266 val, num);
1267 goto put_child;
1268 }
1269 pdata->clkout[num].clkout_src =
1270 SI5351_CLKOUT_SRC_CLKIN;
1271 break;
1272 default:
1273 dev_err(&client->dev,
1274 "invalid parent %d for clkout %d\n",
1275 val, num);
1276 goto put_child;
1277 }
1278 }
1279
1280 if (!of_property_read_u32(child, "silabs,drive-strength",
1281 &val)) {
1282 switch (val) {
1283 case SI5351_DRIVE_2MA:
1284 case SI5351_DRIVE_4MA:
1285 case SI5351_DRIVE_6MA:
1286 case SI5351_DRIVE_8MA:
1287 pdata->clkout[num].drive = val;
1288 break;
1289 default:
1290 dev_err(&client->dev,
1291 "invalid drive strength %d for clkout %d\n",
1292 val, num);
1293 goto put_child;
1294 }
1295 }
1296
1297 if (!of_property_read_u32(child, "silabs,disable-state",
1298 &val)) {
1299 switch (val) {
1300 case 0:
1301 pdata->clkout[num].disable_state =
1302 SI5351_DISABLE_LOW;
1303 break;
1304 case 1:
1305 pdata->clkout[num].disable_state =
1306 SI5351_DISABLE_HIGH;
1307 break;
1308 case 2:
1309 pdata->clkout[num].disable_state =
1310 SI5351_DISABLE_FLOATING;
1311 break;
1312 case 3:
1313 pdata->clkout[num].disable_state =
1314 SI5351_DISABLE_NEVER;
1315 break;
1316 default:
1317 dev_err(&client->dev,
1318 "invalid disable state %d for clkout %d\n",
1319 val, num);
1320 goto put_child;
1321 }
1322 }
1323
1324 if (!of_property_read_u32(child, "clock-frequency", &val))
1325 pdata->clkout[num].rate = val;
1326
1327 pdata->clkout[num].pll_master =
1328 of_property_read_bool(child, "silabs,pll-master");
1329
1330 pdata->clkout[num].pll_reset =
1331 of_property_read_bool(child, "silabs,pll-reset");
1332 }
1333 client->dev.platform_data = pdata;
1334
1335 return 0;
1336 put_child:
1337 of_node_put(child);
1338 return -EINVAL;
1339 }
1340
1341 static struct clk_hw *
1342 si53351_of_clk_get(struct of_phandle_args *clkspec, void *data)
1343 {
1344 struct si5351_driver_data *drvdata = data;
1345 unsigned int idx = clkspec->args[0];
1346
1347 if (idx >= drvdata->num_clkout) {
1348 pr_err("%s: invalid index %u\n", __func__, idx);
1349 return ERR_PTR(-EINVAL);
1350 }
1351
1352 return &drvdata->clkout[idx].hw;
1353 }
1354 #else
1355 static int si5351_dt_parse(struct i2c_client *client, enum si5351_variant variant)
1356 {
1357 return 0;
1358 }
1359
1360 static struct clk_hw *
1361 si53351_of_clk_get(struct of_phandle_args *clkspec, void *data)
1362 {
1363 return NULL;
1364 }
1365 #endif /* CONFIG_OF */
1366
1367 static int si5351_i2c_probe(struct i2c_client *client,
1368 const struct i2c_device_id *id)
1369 {
1370 enum si5351_variant variant = (enum si5351_variant)id->driver_data;
1371 struct si5351_platform_data *pdata;
1372 struct si5351_driver_data *drvdata;
1373 struct clk_init_data init;
1374 const char *parent_names[4];
1375 u8 num_parents, num_clocks;
1376 int ret, n;
1377
1378 ret = si5351_dt_parse(client, variant);
1379 if (ret)
1380 return ret;
1381
1382 pdata = client->dev.platform_data;
1383 if (!pdata)
1384 return -EINVAL;
1385
1386 drvdata = devm_kzalloc(&client->dev, sizeof(*drvdata), GFP_KERNEL);
1387 if (!drvdata)
1388 return -ENOMEM;
1389
1390 i2c_set_clientdata(client, drvdata);
1391 drvdata->client = client;
1392 drvdata->variant = variant;
1393 drvdata->pxtal = devm_clk_get(&client->dev, "xtal");
1394 drvdata->pclkin = devm_clk_get(&client->dev, "clkin");
1395
1396 if (PTR_ERR(drvdata->pxtal) == -EPROBE_DEFER ||
1397 PTR_ERR(drvdata->pclkin) == -EPROBE_DEFER)
1398 return -EPROBE_DEFER;
1399
1400 /*
1401 * Check for valid parent clock: VARIANT_A and VARIANT_B need XTAL,
1402 * VARIANT_C can have CLKIN instead.
1403 */
1404 if (IS_ERR(drvdata->pxtal) &&
1405 (drvdata->variant != SI5351_VARIANT_C || IS_ERR(drvdata->pclkin))) {
1406 dev_err(&client->dev, "missing parent clock\n");
1407 return -EINVAL;
1408 }
1409
1410 drvdata->regmap = devm_regmap_init_i2c(client, &si5351_regmap_config);
1411 if (IS_ERR(drvdata->regmap)) {
1412 dev_err(&client->dev, "failed to allocate register map\n");
1413 return PTR_ERR(drvdata->regmap);
1414 }
1415
1416 /* Disable interrupts */
1417 si5351_reg_write(drvdata, SI5351_INTERRUPT_MASK, 0xf0);
1418 /* Ensure pll select is on XTAL for Si5351A/B */
1419 if (drvdata->variant != SI5351_VARIANT_C)
1420 si5351_set_bits(drvdata, SI5351_PLL_INPUT_SOURCE,
1421 SI5351_PLLA_SOURCE | SI5351_PLLB_SOURCE, 0);
1422
1423 /* setup clock configuration */
1424 for (n = 0; n < 2; n++) {
1425 ret = _si5351_pll_reparent(drvdata, n, pdata->pll_src[n]);
1426 if (ret) {
1427 dev_err(&client->dev,
1428 "failed to reparent pll %d to %d\n",
1429 n, pdata->pll_src[n]);
1430 return ret;
1431 }
1432 }
1433
1434 for (n = 0; n < 8; n++) {
1435 ret = _si5351_msynth_reparent(drvdata, n,
1436 pdata->clkout[n].multisynth_src);
1437 if (ret) {
1438 dev_err(&client->dev,
1439 "failed to reparent multisynth %d to %d\n",
1440 n, pdata->clkout[n].multisynth_src);
1441 return ret;
1442 }
1443
1444 ret = _si5351_clkout_reparent(drvdata, n,
1445 pdata->clkout[n].clkout_src);
1446 if (ret) {
1447 dev_err(&client->dev,
1448 "failed to reparent clkout %d to %d\n",
1449 n, pdata->clkout[n].clkout_src);
1450 return ret;
1451 }
1452
1453 ret = _si5351_clkout_set_drive_strength(drvdata, n,
1454 pdata->clkout[n].drive);
1455 if (ret) {
1456 dev_err(&client->dev,
1457 "failed set drive strength of clkout%d to %d\n",
1458 n, pdata->clkout[n].drive);
1459 return ret;
1460 }
1461
1462 ret = _si5351_clkout_set_disable_state(drvdata, n,
1463 pdata->clkout[n].disable_state);
1464 if (ret) {
1465 dev_err(&client->dev,
1466 "failed set disable state of clkout%d to %d\n",
1467 n, pdata->clkout[n].disable_state);
1468 return ret;
1469 }
1470 }
1471
1472 /* register xtal input clock gate */
1473 memset(&init, 0, sizeof(init));
1474 init.name = si5351_input_names[0];
1475 init.ops = &si5351_xtal_ops;
1476 init.flags = 0;
1477 if (!IS_ERR(drvdata->pxtal)) {
1478 drvdata->pxtal_name = __clk_get_name(drvdata->pxtal);
1479 init.parent_names = &drvdata->pxtal_name;
1480 init.num_parents = 1;
1481 }
1482 drvdata->xtal.init = &init;
1483 ret = devm_clk_hw_register(&client->dev, &drvdata->xtal);
1484 if (ret) {
1485 dev_err(&client->dev, "unable to register %s\n", init.name);
1486 return ret;
1487 }
1488
1489 /* register clkin input clock gate */
1490 if (drvdata->variant == SI5351_VARIANT_C) {
1491 memset(&init, 0, sizeof(init));
1492 init.name = si5351_input_names[1];
1493 init.ops = &si5351_clkin_ops;
1494 if (!IS_ERR(drvdata->pclkin)) {
1495 drvdata->pclkin_name = __clk_get_name(drvdata->pclkin);
1496 init.parent_names = &drvdata->pclkin_name;
1497 init.num_parents = 1;
1498 }
1499 drvdata->clkin.init = &init;
1500 ret = devm_clk_hw_register(&client->dev, &drvdata->clkin);
1501 if (ret) {
1502 dev_err(&client->dev, "unable to register %s\n",
1503 init.name);
1504 return ret;
1505 }
1506 }
1507
1508 /* Si5351C allows to mux either xtal or clkin to PLL input */
1509 num_parents = (drvdata->variant == SI5351_VARIANT_C) ? 2 : 1;
1510 parent_names[0] = si5351_input_names[0];
1511 parent_names[1] = si5351_input_names[1];
1512
1513 /* register PLLA */
1514 drvdata->pll[0].num = 0;
1515 drvdata->pll[0].drvdata = drvdata;
1516 drvdata->pll[0].hw.init = &init;
1517 memset(&init, 0, sizeof(init));
1518 init.name = si5351_pll_names[0];
1519 init.ops = &si5351_pll_ops;
1520 init.flags = 0;
1521 init.parent_names = parent_names;
1522 init.num_parents = num_parents;
1523 ret = devm_clk_hw_register(&client->dev, &drvdata->pll[0].hw);
1524 if (ret) {
1525 dev_err(&client->dev, "unable to register %s\n", init.name);
1526 return ret;
1527 }
1528
1529 /* register PLLB or VXCO (Si5351B) */
1530 drvdata->pll[1].num = 1;
1531 drvdata->pll[1].drvdata = drvdata;
1532 drvdata->pll[1].hw.init = &init;
1533 memset(&init, 0, sizeof(init));
1534 if (drvdata->variant == SI5351_VARIANT_B) {
1535 init.name = si5351_pll_names[2];
1536 init.ops = &si5351_vxco_ops;
1537 init.flags = 0;
1538 init.parent_names = NULL;
1539 init.num_parents = 0;
1540 } else {
1541 init.name = si5351_pll_names[1];
1542 init.ops = &si5351_pll_ops;
1543 init.flags = 0;
1544 init.parent_names = parent_names;
1545 init.num_parents = num_parents;
1546 }
1547 ret = devm_clk_hw_register(&client->dev, &drvdata->pll[1].hw);
1548 if (ret) {
1549 dev_err(&client->dev, "unable to register %s\n", init.name);
1550 return ret;
1551 }
1552
1553 /* register clk multisync and clk out divider */
1554 num_clocks = (drvdata->variant == SI5351_VARIANT_A3) ? 3 : 8;
1555 parent_names[0] = si5351_pll_names[0];
1556 if (drvdata->variant == SI5351_VARIANT_B)
1557 parent_names[1] = si5351_pll_names[2];
1558 else
1559 parent_names[1] = si5351_pll_names[1];
1560
1561 drvdata->msynth = devm_kcalloc(&client->dev, num_clocks,
1562 sizeof(*drvdata->msynth), GFP_KERNEL);
1563 drvdata->clkout = devm_kcalloc(&client->dev, num_clocks,
1564 sizeof(*drvdata->clkout), GFP_KERNEL);
1565 drvdata->num_clkout = num_clocks;
1566
1567 if (WARN_ON(!drvdata->msynth || !drvdata->clkout)) {
1568 ret = -ENOMEM;
1569 return ret;
1570 }
1571
1572 for (n = 0; n < num_clocks; n++) {
1573 drvdata->msynth[n].num = n;
1574 drvdata->msynth[n].drvdata = drvdata;
1575 drvdata->msynth[n].hw.init = &init;
1576 memset(&init, 0, sizeof(init));
1577 init.name = si5351_msynth_names[n];
1578 init.ops = &si5351_msynth_ops;
1579 init.flags = 0;
1580 if (pdata->clkout[n].pll_master)
1581 init.flags |= CLK_SET_RATE_PARENT;
1582 init.parent_names = parent_names;
1583 init.num_parents = 2;
1584 ret = devm_clk_hw_register(&client->dev,
1585 &drvdata->msynth[n].hw);
1586 if (ret) {
1587 dev_err(&client->dev, "unable to register %s\n",
1588 init.name);
1589 return ret;
1590 }
1591 }
1592
1593 num_parents = (drvdata->variant == SI5351_VARIANT_C) ? 4 : 3;
1594 parent_names[2] = si5351_input_names[0];
1595 parent_names[3] = si5351_input_names[1];
1596 for (n = 0; n < num_clocks; n++) {
1597 parent_names[0] = si5351_msynth_names[n];
1598 parent_names[1] = (n < 4) ? si5351_msynth_names[0] :
1599 si5351_msynth_names[4];
1600
1601 drvdata->clkout[n].num = n;
1602 drvdata->clkout[n].drvdata = drvdata;
1603 drvdata->clkout[n].hw.init = &init;
1604 memset(&init, 0, sizeof(init));
1605 init.name = si5351_clkout_names[n];
1606 init.ops = &si5351_clkout_ops;
1607 init.flags = 0;
1608 if (pdata->clkout[n].clkout_src == SI5351_CLKOUT_SRC_MSYNTH_N)
1609 init.flags |= CLK_SET_RATE_PARENT;
1610 init.parent_names = parent_names;
1611 init.num_parents = num_parents;
1612 ret = devm_clk_hw_register(&client->dev,
1613 &drvdata->clkout[n].hw);
1614 if (ret) {
1615 dev_err(&client->dev, "unable to register %s\n",
1616 init.name);
1617 return ret;
1618 }
1619
1620 /* set initial clkout rate */
1621 if (pdata->clkout[n].rate != 0) {
1622 int ret;
1623 ret = clk_set_rate(drvdata->clkout[n].hw.clk,
1624 pdata->clkout[n].rate);
1625 if (ret != 0) {
1626 dev_err(&client->dev, "Cannot set rate : %d\n",
1627 ret);
1628 }
1629 }
1630 }
1631
1632 ret = of_clk_add_hw_provider(client->dev.of_node, si53351_of_clk_get,
1633 drvdata);
1634 if (ret) {
1635 dev_err(&client->dev, "unable to add clk provider\n");
1636 return ret;
1637 }
1638
1639 return 0;
1640 }
1641
1642 static int si5351_i2c_remove(struct i2c_client *client)
1643 {
1644 of_clk_del_provider(client->dev.of_node);
1645
1646 return 0;
1647 }
1648
1649 static const struct i2c_device_id si5351_i2c_ids[] = {
1650 { "si5351a", SI5351_VARIANT_A },
1651 { "si5351a-msop", SI5351_VARIANT_A3 },
1652 { "si5351b", SI5351_VARIANT_B },
1653 { "si5351c", SI5351_VARIANT_C },
1654 { }
1655 };
1656 MODULE_DEVICE_TABLE(i2c, si5351_i2c_ids);
1657
1658 static struct i2c_driver si5351_driver = {
1659 .driver = {
1660 .name = "si5351",
1661 .of_match_table = of_match_ptr(si5351_dt_ids),
1662 },
1663 .probe = si5351_i2c_probe,
1664 .remove = si5351_i2c_remove,
1665 .id_table = si5351_i2c_ids,
1666 };
1667 module_i2c_driver(si5351_driver);
1668
1669 MODULE_AUTHOR("Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com");
1670 MODULE_DESCRIPTION("Silicon Labs Si5351A/B/C clock generator driver");
1671 MODULE_LICENSE("GPL");
Linux with added FPC-III support