xref: /openbmc/linux/drivers/clk/clk-axi-clkgen.c (revision 6222b494)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * AXI clkgen driver
4  *
5  * Copyright 2012-2013 Analog Devices Inc.
6  *  Author: Lars-Peter Clausen <lars@metafoo.de>
7  */
8 
9 #include <linux/platform_device.h>
10 #include <linux/clk-provider.h>
11 #include <linux/slab.h>
12 #include <linux/io.h>
13 #include <linux/of.h>
14 #include <linux/module.h>
15 #include <linux/err.h>
16 
17 #define AXI_CLKGEN_V2_REG_RESET		0x40
18 #define AXI_CLKGEN_V2_REG_CLKSEL	0x44
19 #define AXI_CLKGEN_V2_REG_DRP_CNTRL	0x70
20 #define AXI_CLKGEN_V2_REG_DRP_STATUS	0x74
21 
22 #define AXI_CLKGEN_V2_RESET_MMCM_ENABLE	BIT(1)
23 #define AXI_CLKGEN_V2_RESET_ENABLE	BIT(0)
24 
25 #define AXI_CLKGEN_V2_DRP_CNTRL_SEL	BIT(29)
26 #define AXI_CLKGEN_V2_DRP_CNTRL_READ	BIT(28)
27 
28 #define AXI_CLKGEN_V2_DRP_STATUS_BUSY	BIT(16)
29 
30 #define MMCM_REG_CLKOUT5_2	0x07
31 #define MMCM_REG_CLKOUT0_1	0x08
32 #define MMCM_REG_CLKOUT0_2	0x09
33 #define MMCM_REG_CLKOUT6_2	0x13
34 #define MMCM_REG_CLK_FB1	0x14
35 #define MMCM_REG_CLK_FB2	0x15
36 #define MMCM_REG_CLK_DIV	0x16
37 #define MMCM_REG_LOCK1		0x18
38 #define MMCM_REG_LOCK2		0x19
39 #define MMCM_REG_LOCK3		0x1a
40 #define MMCM_REG_POWER		0x28
41 #define MMCM_REG_FILTER1	0x4e
42 #define MMCM_REG_FILTER2	0x4f
43 
44 #define MMCM_CLKOUT_NOCOUNT	BIT(6)
45 
46 #define MMCM_CLK_DIV_DIVIDE	BIT(11)
47 #define MMCM_CLK_DIV_NOCOUNT	BIT(12)
48 
49 struct axi_clkgen_limits {
50 	unsigned int fpfd_min;
51 	unsigned int fpfd_max;
52 	unsigned int fvco_min;
53 	unsigned int fvco_max;
54 };
55 
56 struct axi_clkgen {
57 	void __iomem *base;
58 	struct clk_hw clk_hw;
59 	struct axi_clkgen_limits limits;
60 };
61 
axi_clkgen_lookup_filter(unsigned int m)62 static uint32_t axi_clkgen_lookup_filter(unsigned int m)
63 {
64 	switch (m) {
65 	case 0:
66 		return 0x01001990;
67 	case 1:
68 		return 0x01001190;
69 	case 2:
70 		return 0x01009890;
71 	case 3:
72 		return 0x01001890;
73 	case 4:
74 		return 0x01008890;
75 	case 5 ... 8:
76 		return 0x01009090;
77 	case 9 ... 11:
78 		return 0x01000890;
79 	case 12:
80 		return 0x08009090;
81 	case 13 ... 22:
82 		return 0x01001090;
83 	case 23 ... 36:
84 		return 0x01008090;
85 	case 37 ... 46:
86 		return 0x08001090;
87 	default:
88 		return 0x08008090;
89 	}
90 }
91 
92 static const uint32_t axi_clkgen_lock_table[] = {
93 	0x060603e8, 0x060603e8, 0x080803e8, 0x0b0b03e8,
94 	0x0e0e03e8, 0x111103e8, 0x131303e8, 0x161603e8,
95 	0x191903e8, 0x1c1c03e8, 0x1f1f0384, 0x1f1f0339,
96 	0x1f1f02ee, 0x1f1f02bc, 0x1f1f028a, 0x1f1f0271,
97 	0x1f1f023f, 0x1f1f0226, 0x1f1f020d, 0x1f1f01f4,
98 	0x1f1f01db, 0x1f1f01c2, 0x1f1f01a9, 0x1f1f0190,
99 	0x1f1f0190, 0x1f1f0177, 0x1f1f015e, 0x1f1f015e,
100 	0x1f1f0145, 0x1f1f0145, 0x1f1f012c, 0x1f1f012c,
101 	0x1f1f012c, 0x1f1f0113, 0x1f1f0113, 0x1f1f0113,
102 };
103 
axi_clkgen_lookup_lock(unsigned int m)104 static uint32_t axi_clkgen_lookup_lock(unsigned int m)
105 {
106 	if (m < ARRAY_SIZE(axi_clkgen_lock_table))
107 		return axi_clkgen_lock_table[m];
108 	return 0x1f1f00fa;
109 }
110 
111 static const struct axi_clkgen_limits axi_clkgen_zynqmp_default_limits = {
112 	.fpfd_min = 10000,
113 	.fpfd_max = 450000,
114 	.fvco_min = 800000,
115 	.fvco_max = 1600000,
116 };
117 
118 static const struct axi_clkgen_limits axi_clkgen_zynq_default_limits = {
119 	.fpfd_min = 10000,
120 	.fpfd_max = 300000,
121 	.fvco_min = 600000,
122 	.fvco_max = 1200000,
123 };
124 
axi_clkgen_calc_params(const struct axi_clkgen_limits * limits,unsigned long fin,unsigned long fout,unsigned int * best_d,unsigned int * best_m,unsigned int * best_dout)125 static void axi_clkgen_calc_params(const struct axi_clkgen_limits *limits,
126 	unsigned long fin, unsigned long fout,
127 	unsigned int *best_d, unsigned int *best_m, unsigned int *best_dout)
128 {
129 	unsigned long d, d_min, d_max, _d_min, _d_max;
130 	unsigned long m, m_min, m_max;
131 	unsigned long f, dout, best_f, fvco;
132 	unsigned long fract_shift = 0;
133 	unsigned long fvco_min_fract, fvco_max_fract;
134 
135 	fin /= 1000;
136 	fout /= 1000;
137 
138 	best_f = ULONG_MAX;
139 	*best_d = 0;
140 	*best_m = 0;
141 	*best_dout = 0;
142 
143 	d_min = max_t(unsigned long, DIV_ROUND_UP(fin, limits->fpfd_max), 1);
144 	d_max = min_t(unsigned long, fin / limits->fpfd_min, 80);
145 
146 again:
147 	fvco_min_fract = limits->fvco_min << fract_shift;
148 	fvco_max_fract = limits->fvco_max << fract_shift;
149 
150 	m_min = max_t(unsigned long, DIV_ROUND_UP(fvco_min_fract, fin) * d_min, 1);
151 	m_max = min_t(unsigned long, fvco_max_fract * d_max / fin, 64 << fract_shift);
152 
153 	for (m = m_min; m <= m_max; m++) {
154 		_d_min = max(d_min, DIV_ROUND_UP(fin * m, fvco_max_fract));
155 		_d_max = min(d_max, fin * m / fvco_min_fract);
156 
157 		for (d = _d_min; d <= _d_max; d++) {
158 			fvco = fin * m / d;
159 
160 			dout = DIV_ROUND_CLOSEST(fvco, fout);
161 			dout = clamp_t(unsigned long, dout, 1, 128 << fract_shift);
162 			f = fvco / dout;
163 			if (abs(f - fout) < abs(best_f - fout)) {
164 				best_f = f;
165 				*best_d = d;
166 				*best_m = m << (3 - fract_shift);
167 				*best_dout = dout << (3 - fract_shift);
168 				if (best_f == fout)
169 					return;
170 			}
171 		}
172 	}
173 
174 	/* Lets see if we find a better setting in fractional mode */
175 	if (fract_shift == 0) {
176 		fract_shift = 3;
177 		goto again;
178 	}
179 }
180 
181 struct axi_clkgen_div_params {
182 	unsigned int low;
183 	unsigned int high;
184 	unsigned int edge;
185 	unsigned int nocount;
186 	unsigned int frac_en;
187 	unsigned int frac;
188 	unsigned int frac_wf_f;
189 	unsigned int frac_wf_r;
190 	unsigned int frac_phase;
191 };
192 
axi_clkgen_calc_clk_params(unsigned int divider,unsigned int frac_divider,struct axi_clkgen_div_params * params)193 static void axi_clkgen_calc_clk_params(unsigned int divider,
194 	unsigned int frac_divider, struct axi_clkgen_div_params *params)
195 {
196 
197 	memset(params, 0x0, sizeof(*params));
198 
199 	if (divider == 1) {
200 		params->nocount = 1;
201 		return;
202 	}
203 
204 	if (frac_divider == 0) {
205 		params->high = divider / 2;
206 		params->edge = divider % 2;
207 		params->low = divider - params->high;
208 	} else {
209 		params->frac_en = 1;
210 		params->frac = frac_divider;
211 
212 		params->high = divider / 2;
213 		params->edge = divider % 2;
214 		params->low = params->high;
215 
216 		if (params->edge == 0) {
217 			params->high--;
218 			params->frac_wf_r = 1;
219 		}
220 
221 		if (params->edge == 0 || frac_divider == 1)
222 			params->low--;
223 		if (((params->edge == 0) ^ (frac_divider == 1)) ||
224 			(divider == 2 && frac_divider == 1))
225 			params->frac_wf_f = 1;
226 
227 		params->frac_phase = params->edge * 4 + frac_divider / 2;
228 	}
229 }
230 
axi_clkgen_write(struct axi_clkgen * axi_clkgen,unsigned int reg,unsigned int val)231 static void axi_clkgen_write(struct axi_clkgen *axi_clkgen,
232 	unsigned int reg, unsigned int val)
233 {
234 	writel(val, axi_clkgen->base + reg);
235 }
236 
axi_clkgen_read(struct axi_clkgen * axi_clkgen,unsigned int reg,unsigned int * val)237 static void axi_clkgen_read(struct axi_clkgen *axi_clkgen,
238 	unsigned int reg, unsigned int *val)
239 {
240 	*val = readl(axi_clkgen->base + reg);
241 }
242 
axi_clkgen_wait_non_busy(struct axi_clkgen * axi_clkgen)243 static int axi_clkgen_wait_non_busy(struct axi_clkgen *axi_clkgen)
244 {
245 	unsigned int timeout = 10000;
246 	unsigned int val;
247 
248 	do {
249 		axi_clkgen_read(axi_clkgen, AXI_CLKGEN_V2_REG_DRP_STATUS, &val);
250 	} while ((val & AXI_CLKGEN_V2_DRP_STATUS_BUSY) && --timeout);
251 
252 	if (val & AXI_CLKGEN_V2_DRP_STATUS_BUSY)
253 		return -EIO;
254 
255 	return val & 0xffff;
256 }
257 
axi_clkgen_mmcm_read(struct axi_clkgen * axi_clkgen,unsigned int reg,unsigned int * val)258 static int axi_clkgen_mmcm_read(struct axi_clkgen *axi_clkgen,
259 	unsigned int reg, unsigned int *val)
260 {
261 	unsigned int reg_val;
262 	int ret;
263 
264 	ret = axi_clkgen_wait_non_busy(axi_clkgen);
265 	if (ret < 0)
266 		return ret;
267 
268 	reg_val = AXI_CLKGEN_V2_DRP_CNTRL_SEL | AXI_CLKGEN_V2_DRP_CNTRL_READ;
269 	reg_val |= (reg << 16);
270 
271 	axi_clkgen_write(axi_clkgen, AXI_CLKGEN_V2_REG_DRP_CNTRL, reg_val);
272 
273 	ret = axi_clkgen_wait_non_busy(axi_clkgen);
274 	if (ret < 0)
275 		return ret;
276 
277 	*val = ret;
278 
279 	return 0;
280 }
281 
axi_clkgen_mmcm_write(struct axi_clkgen * axi_clkgen,unsigned int reg,unsigned int val,unsigned int mask)282 static int axi_clkgen_mmcm_write(struct axi_clkgen *axi_clkgen,
283 	unsigned int reg, unsigned int val, unsigned int mask)
284 {
285 	unsigned int reg_val = 0;
286 	int ret;
287 
288 	ret = axi_clkgen_wait_non_busy(axi_clkgen);
289 	if (ret < 0)
290 		return ret;
291 
292 	if (mask != 0xffff) {
293 		axi_clkgen_mmcm_read(axi_clkgen, reg, &reg_val);
294 		reg_val &= ~mask;
295 	}
296 
297 	reg_val |= AXI_CLKGEN_V2_DRP_CNTRL_SEL | (reg << 16) | (val & mask);
298 
299 	axi_clkgen_write(axi_clkgen, AXI_CLKGEN_V2_REG_DRP_CNTRL, reg_val);
300 
301 	return 0;
302 }
303 
axi_clkgen_mmcm_enable(struct axi_clkgen * axi_clkgen,bool enable)304 static void axi_clkgen_mmcm_enable(struct axi_clkgen *axi_clkgen,
305 	bool enable)
306 {
307 	unsigned int val = AXI_CLKGEN_V2_RESET_ENABLE;
308 
309 	if (enable)
310 		val |= AXI_CLKGEN_V2_RESET_MMCM_ENABLE;
311 
312 	axi_clkgen_write(axi_clkgen, AXI_CLKGEN_V2_REG_RESET, val);
313 }
314 
clk_hw_to_axi_clkgen(struct clk_hw * clk_hw)315 static struct axi_clkgen *clk_hw_to_axi_clkgen(struct clk_hw *clk_hw)
316 {
317 	return container_of(clk_hw, struct axi_clkgen, clk_hw);
318 }
319 
axi_clkgen_set_div(struct axi_clkgen * axi_clkgen,unsigned int reg1,unsigned int reg2,unsigned int reg3,struct axi_clkgen_div_params * params)320 static void axi_clkgen_set_div(struct axi_clkgen *axi_clkgen,
321 	unsigned int reg1, unsigned int reg2, unsigned int reg3,
322 	struct axi_clkgen_div_params *params)
323 {
324 	axi_clkgen_mmcm_write(axi_clkgen, reg1,
325 		(params->high << 6) | params->low, 0xefff);
326 	axi_clkgen_mmcm_write(axi_clkgen, reg2,
327 		(params->frac << 12) | (params->frac_en << 11) |
328 		(params->frac_wf_r << 10) | (params->edge << 7) |
329 		(params->nocount << 6), 0x7fff);
330 	if (reg3 != 0) {
331 		axi_clkgen_mmcm_write(axi_clkgen, reg3,
332 			(params->frac_phase << 11) | (params->frac_wf_f << 10), 0x3c00);
333 	}
334 }
335 
axi_clkgen_set_rate(struct clk_hw * clk_hw,unsigned long rate,unsigned long parent_rate)336 static int axi_clkgen_set_rate(struct clk_hw *clk_hw,
337 	unsigned long rate, unsigned long parent_rate)
338 {
339 	struct axi_clkgen *axi_clkgen = clk_hw_to_axi_clkgen(clk_hw);
340 	const struct axi_clkgen_limits *limits = &axi_clkgen->limits;
341 	unsigned int d, m, dout;
342 	struct axi_clkgen_div_params params;
343 	uint32_t power = 0;
344 	uint32_t filter;
345 	uint32_t lock;
346 
347 	if (parent_rate == 0 || rate == 0)
348 		return -EINVAL;
349 
350 	axi_clkgen_calc_params(limits, parent_rate, rate, &d, &m, &dout);
351 
352 	if (d == 0 || dout == 0 || m == 0)
353 		return -EINVAL;
354 
355 	if ((dout & 0x7) != 0 || (m & 0x7) != 0)
356 		power |= 0x9800;
357 
358 	axi_clkgen_mmcm_write(axi_clkgen, MMCM_REG_POWER, power, 0x9800);
359 
360 	filter = axi_clkgen_lookup_filter(m - 1);
361 	lock = axi_clkgen_lookup_lock(m - 1);
362 
363 	axi_clkgen_calc_clk_params(dout >> 3, dout & 0x7, &params);
364 	axi_clkgen_set_div(axi_clkgen,  MMCM_REG_CLKOUT0_1, MMCM_REG_CLKOUT0_2,
365 		MMCM_REG_CLKOUT5_2, &params);
366 
367 	axi_clkgen_calc_clk_params(d, 0, &params);
368 	axi_clkgen_mmcm_write(axi_clkgen, MMCM_REG_CLK_DIV,
369 		(params.edge << 13) | (params.nocount << 12) |
370 		(params.high << 6) | params.low, 0x3fff);
371 
372 	axi_clkgen_calc_clk_params(m >> 3, m & 0x7, &params);
373 	axi_clkgen_set_div(axi_clkgen,  MMCM_REG_CLK_FB1, MMCM_REG_CLK_FB2,
374 		MMCM_REG_CLKOUT6_2, &params);
375 
376 	axi_clkgen_mmcm_write(axi_clkgen, MMCM_REG_LOCK1, lock & 0x3ff, 0x3ff);
377 	axi_clkgen_mmcm_write(axi_clkgen, MMCM_REG_LOCK2,
378 		(((lock >> 16) & 0x1f) << 10) | 0x1, 0x7fff);
379 	axi_clkgen_mmcm_write(axi_clkgen, MMCM_REG_LOCK3,
380 		(((lock >> 24) & 0x1f) << 10) | 0x3e9, 0x7fff);
381 	axi_clkgen_mmcm_write(axi_clkgen, MMCM_REG_FILTER1, filter >> 16, 0x9900);
382 	axi_clkgen_mmcm_write(axi_clkgen, MMCM_REG_FILTER2, filter, 0x9900);
383 
384 	return 0;
385 }
386 
axi_clkgen_determine_rate(struct clk_hw * hw,struct clk_rate_request * req)387 static int axi_clkgen_determine_rate(struct clk_hw *hw,
388 				     struct clk_rate_request *req)
389 {
390 	struct axi_clkgen *axi_clkgen = clk_hw_to_axi_clkgen(hw);
391 	const struct axi_clkgen_limits *limits = &axi_clkgen->limits;
392 	unsigned int d, m, dout;
393 	unsigned long long tmp;
394 
395 	axi_clkgen_calc_params(limits, req->best_parent_rate, req->rate,
396 			       &d, &m, &dout);
397 
398 	if (d == 0 || dout == 0 || m == 0)
399 		return -EINVAL;
400 
401 	tmp = (unsigned long long)req->best_parent_rate * m;
402 	tmp = DIV_ROUND_CLOSEST_ULL(tmp, dout * d);
403 
404 	req->rate = min_t(unsigned long long, tmp, LONG_MAX);
405 	return 0;
406 }
407 
axi_clkgen_get_div(struct axi_clkgen * axi_clkgen,unsigned int reg1,unsigned int reg2)408 static unsigned int axi_clkgen_get_div(struct axi_clkgen *axi_clkgen,
409 	unsigned int reg1, unsigned int reg2)
410 {
411 	unsigned int val1, val2;
412 	unsigned int div;
413 
414 	axi_clkgen_mmcm_read(axi_clkgen, reg2, &val2);
415 	if (val2 & MMCM_CLKOUT_NOCOUNT)
416 		return 8;
417 
418 	axi_clkgen_mmcm_read(axi_clkgen, reg1, &val1);
419 
420 	div = (val1 & 0x3f) + ((val1 >> 6) & 0x3f);
421 	div <<= 3;
422 
423 	if (val2 & MMCM_CLK_DIV_DIVIDE) {
424 		if ((val2 & BIT(7)) && (val2 & 0x7000) != 0x1000)
425 			div += 8;
426 		else
427 			div += 16;
428 
429 		div += (val2 >> 12) & 0x7;
430 	}
431 
432 	return div;
433 }
434 
axi_clkgen_recalc_rate(struct clk_hw * clk_hw,unsigned long parent_rate)435 static unsigned long axi_clkgen_recalc_rate(struct clk_hw *clk_hw,
436 	unsigned long parent_rate)
437 {
438 	struct axi_clkgen *axi_clkgen = clk_hw_to_axi_clkgen(clk_hw);
439 	unsigned int d, m, dout;
440 	unsigned long long tmp;
441 	unsigned int val;
442 
443 	dout = axi_clkgen_get_div(axi_clkgen, MMCM_REG_CLKOUT0_1,
444 		MMCM_REG_CLKOUT0_2);
445 	m = axi_clkgen_get_div(axi_clkgen, MMCM_REG_CLK_FB1,
446 		MMCM_REG_CLK_FB2);
447 
448 	axi_clkgen_mmcm_read(axi_clkgen, MMCM_REG_CLK_DIV, &val);
449 	if (val & MMCM_CLK_DIV_NOCOUNT)
450 		d = 1;
451 	else
452 		d = (val & 0x3f) + ((val >> 6) & 0x3f);
453 
454 	if (d == 0 || dout == 0)
455 		return 0;
456 
457 	tmp = (unsigned long long)parent_rate * m;
458 	tmp = DIV_ROUND_CLOSEST_ULL(tmp, dout * d);
459 
460 	return min_t(unsigned long long, tmp, ULONG_MAX);
461 }
462 
axi_clkgen_enable(struct clk_hw * clk_hw)463 static int axi_clkgen_enable(struct clk_hw *clk_hw)
464 {
465 	struct axi_clkgen *axi_clkgen = clk_hw_to_axi_clkgen(clk_hw);
466 
467 	axi_clkgen_mmcm_enable(axi_clkgen, true);
468 
469 	return 0;
470 }
471 
axi_clkgen_disable(struct clk_hw * clk_hw)472 static void axi_clkgen_disable(struct clk_hw *clk_hw)
473 {
474 	struct axi_clkgen *axi_clkgen = clk_hw_to_axi_clkgen(clk_hw);
475 
476 	axi_clkgen_mmcm_enable(axi_clkgen, false);
477 }
478 
axi_clkgen_set_parent(struct clk_hw * clk_hw,u8 index)479 static int axi_clkgen_set_parent(struct clk_hw *clk_hw, u8 index)
480 {
481 	struct axi_clkgen *axi_clkgen = clk_hw_to_axi_clkgen(clk_hw);
482 
483 	axi_clkgen_write(axi_clkgen, AXI_CLKGEN_V2_REG_CLKSEL, index);
484 
485 	return 0;
486 }
487 
axi_clkgen_get_parent(struct clk_hw * clk_hw)488 static u8 axi_clkgen_get_parent(struct clk_hw *clk_hw)
489 {
490 	struct axi_clkgen *axi_clkgen = clk_hw_to_axi_clkgen(clk_hw);
491 	unsigned int parent;
492 
493 	axi_clkgen_read(axi_clkgen, AXI_CLKGEN_V2_REG_CLKSEL, &parent);
494 
495 	return parent;
496 }
497 
498 static const struct clk_ops axi_clkgen_ops = {
499 	.recalc_rate = axi_clkgen_recalc_rate,
500 	.determine_rate = axi_clkgen_determine_rate,
501 	.set_rate = axi_clkgen_set_rate,
502 	.enable = axi_clkgen_enable,
503 	.disable = axi_clkgen_disable,
504 	.set_parent = axi_clkgen_set_parent,
505 	.get_parent = axi_clkgen_get_parent,
506 };
507 
axi_clkgen_probe(struct platform_device * pdev)508 static int axi_clkgen_probe(struct platform_device *pdev)
509 {
510 	const struct axi_clkgen_limits *dflt_limits;
511 	struct axi_clkgen *axi_clkgen;
512 	struct clk_init_data init;
513 	const char *parent_names[2];
514 	const char *clk_name;
515 	unsigned int i;
516 	int ret;
517 
518 	dflt_limits = device_get_match_data(&pdev->dev);
519 	if (!dflt_limits)
520 		return -ENODEV;
521 
522 	axi_clkgen = devm_kzalloc(&pdev->dev, sizeof(*axi_clkgen), GFP_KERNEL);
523 	if (!axi_clkgen)
524 		return -ENOMEM;
525 
526 	axi_clkgen->base = devm_platform_ioremap_resource(pdev, 0);
527 	if (IS_ERR(axi_clkgen->base))
528 		return PTR_ERR(axi_clkgen->base);
529 
530 	init.num_parents = of_clk_get_parent_count(pdev->dev.of_node);
531 	if (init.num_parents < 1 || init.num_parents > 2)
532 		return -EINVAL;
533 
534 	for (i = 0; i < init.num_parents; i++) {
535 		parent_names[i] = of_clk_get_parent_name(pdev->dev.of_node, i);
536 		if (!parent_names[i])
537 			return -EINVAL;
538 	}
539 
540 	memcpy(&axi_clkgen->limits, dflt_limits, sizeof(axi_clkgen->limits));
541 
542 	clk_name = pdev->dev.of_node->name;
543 	of_property_read_string(pdev->dev.of_node, "clock-output-names",
544 		&clk_name);
545 
546 	init.name = clk_name;
547 	init.ops = &axi_clkgen_ops;
548 	init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
549 	init.parent_names = parent_names;
550 
551 	axi_clkgen_mmcm_enable(axi_clkgen, false);
552 
553 	axi_clkgen->clk_hw.init = &init;
554 	ret = devm_clk_hw_register(&pdev->dev, &axi_clkgen->clk_hw);
555 	if (ret)
556 		return ret;
557 
558 	return devm_of_clk_add_hw_provider(&pdev->dev, of_clk_hw_simple_get,
559 					   &axi_clkgen->clk_hw);
560 }
561 
562 static const struct of_device_id axi_clkgen_ids[] = {
563 	{
564 		.compatible = "adi,zynqmp-axi-clkgen-2.00.a",
565 		.data = &axi_clkgen_zynqmp_default_limits,
566 	},
567 	{
568 		.compatible = "adi,axi-clkgen-2.00.a",
569 		.data = &axi_clkgen_zynq_default_limits,
570 	},
571 	{ }
572 };
573 MODULE_DEVICE_TABLE(of, axi_clkgen_ids);
574 
575 static struct platform_driver axi_clkgen_driver = {
576 	.driver = {
577 		.name = "adi-axi-clkgen",
578 		.of_match_table = axi_clkgen_ids,
579 	},
580 	.probe = axi_clkgen_probe,
581 };
582 module_platform_driver(axi_clkgen_driver);
583 
584 MODULE_LICENSE("GPL v2");
585 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
586 MODULE_DESCRIPTION("Driver for the Analog Devices' AXI clkgen pcore clock generator");
587