xref: /linux/drivers/clk/sifive/sifive-prci.c (revision e7d759f31ca295d589f7420719c311870bb3166f) 
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2020 SiFive, Inc.
4  * Copyright (C) 2020 Zong Li
5  */
6 
7 #include <linux/clkdev.h>
8 #include <linux/delay.h>
9 #include <linux/io.h>
10 #include <linux/module.h>
11 #include <linux/of.h>
12 #include "sifive-prci.h"
13 #include "fu540-prci.h"
14 #include "fu740-prci.h"
15 
16 /*
17  * Private functions
18  */
19 
20 /**
21  * __prci_readl() - read from a PRCI register
22  * @pd: PRCI context
23  * @offs: register offset to read from (in bytes, from PRCI base address)
24  *
25  * Read the register located at offset @offs from the base virtual
26  * address of the PRCI register target described by @pd, and return
27  * the value to the caller.
28  *
29  * Context: Any context.
30  *
31  * Return: the contents of the register described by @pd and @offs.
32  */
33 static u32 __prci_readl(struct __prci_data *pd, u32 offs)
34 {
35 	return readl_relaxed(pd->va + offs);
36 }
37 
38 static void __prci_writel(u32 v, u32 offs, struct __prci_data *pd)
39 {
40 	writel_relaxed(v, pd->va + offs);
41 }
42 
43 /* WRPLL-related private functions */
44 
45 /**
46  * __prci_wrpll_unpack() - unpack WRPLL configuration registers into parameters
47  * @c: ptr to a struct wrpll_cfg record to write config into
48  * @r: value read from the PRCI PLL configuration register
49  *
50  * Given a value @r read from an FU740 PRCI PLL configuration register,
51  * split it into fields and populate it into the WRPLL configuration record
52  * pointed to by @c.
53  *
54  * The COREPLLCFG0 macros are used below, but the other *PLLCFG0 macros
55  * have the same register layout.
56  *
57  * Context: Any context.
58  */
59 static void __prci_wrpll_unpack(struct wrpll_cfg *c, u32 r)
60 {
61 	u32 v;
62 
63 	v = r & PRCI_COREPLLCFG0_DIVR_MASK;
64 	v >>= PRCI_COREPLLCFG0_DIVR_SHIFT;
65 	c->divr = v;
66 
67 	v = r & PRCI_COREPLLCFG0_DIVF_MASK;
68 	v >>= PRCI_COREPLLCFG0_DIVF_SHIFT;
69 	c->divf = v;
70 
71 	v = r & PRCI_COREPLLCFG0_DIVQ_MASK;
72 	v >>= PRCI_COREPLLCFG0_DIVQ_SHIFT;
73 	c->divq = v;
74 
75 	v = r & PRCI_COREPLLCFG0_RANGE_MASK;
76 	v >>= PRCI_COREPLLCFG0_RANGE_SHIFT;
77 	c->range = v;
78 
79 	c->flags &=
80 	    (WRPLL_FLAGS_INT_FEEDBACK_MASK | WRPLL_FLAGS_EXT_FEEDBACK_MASK);
81 
82 	/* external feedback mode not supported */
83 	c->flags |= WRPLL_FLAGS_INT_FEEDBACK_MASK;
84 }
85 
86 /**
87  * __prci_wrpll_pack() - pack PLL configuration parameters into a register value
88  * @c: pointer to a struct wrpll_cfg record containing the PLL's cfg
89  *
90  * Using a set of WRPLL configuration values pointed to by @c,
91  * assemble a PRCI PLL configuration register value, and return it to
92  * the caller.
93  *
94  * Context: Any context.  Caller must ensure that the contents of the
95  *          record pointed to by @c do not change during the execution
96  *          of this function.
97  *
98  * Returns: a value suitable for writing into a PRCI PLL configuration
99  *          register
100  */
101 static u32 __prci_wrpll_pack(const struct wrpll_cfg *c)
102 {
103 	u32 r = 0;
104 
105 	r |= c->divr << PRCI_COREPLLCFG0_DIVR_SHIFT;
106 	r |= c->divf << PRCI_COREPLLCFG0_DIVF_SHIFT;
107 	r |= c->divq << PRCI_COREPLLCFG0_DIVQ_SHIFT;
108 	r |= c->range << PRCI_COREPLLCFG0_RANGE_SHIFT;
109 
110 	/* external feedback mode not supported */
111 	r |= PRCI_COREPLLCFG0_FSE_MASK;
112 
113 	return r;
114 }
115 
116 /**
117  * __prci_wrpll_read_cfg0() - read the WRPLL configuration from the PRCI
118  * @pd: PRCI context
119  * @pwd: PRCI WRPLL metadata
120  *
121  * Read the current configuration of the PLL identified by @pwd from
122  * the PRCI identified by @pd, and store it into the local configuration
123  * cache in @pwd.
124  *
125  * Context: Any context.  Caller must prevent the records pointed to by
126  *          @pd and @pwd from changing during execution.
127  */
128 static void __prci_wrpll_read_cfg0(struct __prci_data *pd,
129 				   struct __prci_wrpll_data *pwd)
130 {
131 	__prci_wrpll_unpack(&pwd->c, __prci_readl(pd, pwd->cfg0_offs));
132 }
133 
134 /**
135  * __prci_wrpll_write_cfg0() - write WRPLL configuration into the PRCI
136  * @pd: PRCI context
137  * @pwd: PRCI WRPLL metadata
138  * @c: WRPLL configuration record to write
139  *
140  * Write the WRPLL configuration described by @c into the WRPLL
141  * configuration register identified by @pwd in the PRCI instance
142  * described by @c.  Make a cached copy of the WRPLL's current
143  * configuration so it can be used by other code.
144  *
145  * Context: Any context.  Caller must prevent the records pointed to by
146  *          @pd and @pwd from changing during execution.
147  */
148 static void __prci_wrpll_write_cfg0(struct __prci_data *pd,
149 				    struct __prci_wrpll_data *pwd,
150 				    struct wrpll_cfg *c)
151 {
152 	__prci_writel(__prci_wrpll_pack(c), pwd->cfg0_offs, pd);
153 
154 	memcpy(&pwd->c, c, sizeof(*c));
155 }
156 
157 /**
158  * __prci_wrpll_write_cfg1() - write Clock enable/disable configuration
159  * into the PRCI
160  * @pd: PRCI context
161  * @pwd: PRCI WRPLL metadata
162  * @enable: Clock enable or disable value
163  */
164 static void __prci_wrpll_write_cfg1(struct __prci_data *pd,
165 				    struct __prci_wrpll_data *pwd,
166 				    u32 enable)
167 {
168 	__prci_writel(enable, pwd->cfg1_offs, pd);
169 }
170 
171 /*
172  * Linux clock framework integration
173  *
174  * See the Linux clock framework documentation for more information on
175  * these functions.
176  */
177 
178 unsigned long sifive_prci_wrpll_recalc_rate(struct clk_hw *hw,
179 					    unsigned long parent_rate)
180 {
181 	struct __prci_clock *pc = clk_hw_to_prci_clock(hw);
182 	struct __prci_wrpll_data *pwd = pc->pwd;
183 
184 	return wrpll_calc_output_rate(&pwd->c, parent_rate);
185 }
186 
187 long sifive_prci_wrpll_round_rate(struct clk_hw *hw,
188 				  unsigned long rate,
189 				  unsigned long *parent_rate)
190 {
191 	struct __prci_clock *pc = clk_hw_to_prci_clock(hw);
192 	struct __prci_wrpll_data *pwd = pc->pwd;
193 	struct wrpll_cfg c;
194 
195 	memcpy(&c, &pwd->c, sizeof(c));
196 
197 	wrpll_configure_for_rate(&c, rate, *parent_rate);
198 
199 	return wrpll_calc_output_rate(&c, *parent_rate);
200 }
201 
202 int sifive_prci_wrpll_set_rate(struct clk_hw *hw,
203 			       unsigned long rate, unsigned long parent_rate)
204 {
205 	struct __prci_clock *pc = clk_hw_to_prci_clock(hw);
206 	struct __prci_wrpll_data *pwd = pc->pwd;
207 	struct __prci_data *pd = pc->pd;
208 	int r;
209 
210 	r = wrpll_configure_for_rate(&pwd->c, rate, parent_rate);
211 	if (r)
212 		return r;
213 
214 	if (pwd->enable_bypass)
215 		pwd->enable_bypass(pd);
216 
217 	__prci_wrpll_write_cfg0(pd, pwd, &pwd->c);
218 
219 	udelay(wrpll_calc_max_lock_us(&pwd->c));
220 
221 	return 0;
222 }
223 
224 int sifive_clk_is_enabled(struct clk_hw *hw)
225 {
226 	struct __prci_clock *pc = clk_hw_to_prci_clock(hw);
227 	struct __prci_wrpll_data *pwd = pc->pwd;
228 	struct __prci_data *pd = pc->pd;
229 	u32 r;
230 
231 	r = __prci_readl(pd, pwd->cfg1_offs);
232 
233 	if (r & PRCI_COREPLLCFG1_CKE_MASK)
234 		return 1;
235 	else
236 		return 0;
237 }
238 
239 int sifive_prci_clock_enable(struct clk_hw *hw)
240 {
241 	struct __prci_clock *pc = clk_hw_to_prci_clock(hw);
242 	struct __prci_wrpll_data *pwd = pc->pwd;
243 	struct __prci_data *pd = pc->pd;
244 
245 	if (sifive_clk_is_enabled(hw))
246 		return 0;
247 
248 	__prci_wrpll_write_cfg1(pd, pwd, PRCI_COREPLLCFG1_CKE_MASK);
249 
250 	if (pwd->disable_bypass)
251 		pwd->disable_bypass(pd);
252 
253 	return 0;
254 }
255 
256 void sifive_prci_clock_disable(struct clk_hw *hw)
257 {
258 	struct __prci_clock *pc = clk_hw_to_prci_clock(hw);
259 	struct __prci_wrpll_data *pwd = pc->pwd;
260 	struct __prci_data *pd = pc->pd;
261 	u32 r;
262 
263 	if (pwd->enable_bypass)
264 		pwd->enable_bypass(pd);
265 
266 	r = __prci_readl(pd, pwd->cfg1_offs);
267 	r &= ~PRCI_COREPLLCFG1_CKE_MASK;
268 
269 	__prci_wrpll_write_cfg1(pd, pwd, r);
270 }
271 
272 /* TLCLKSEL clock integration */
273 
274 unsigned long sifive_prci_tlclksel_recalc_rate(struct clk_hw *hw,
275 					       unsigned long parent_rate)
276 {
277 	struct __prci_clock *pc = clk_hw_to_prci_clock(hw);
278 	struct __prci_data *pd = pc->pd;
279 	u32 v;
280 	u8 div;
281 
282 	v = __prci_readl(pd, PRCI_CLKMUXSTATUSREG_OFFSET);
283 	v &= PRCI_CLKMUXSTATUSREG_TLCLKSEL_STATUS_MASK;
284 	div = v ? 1 : 2;
285 
286 	return div_u64(parent_rate, div);
287 }
288 
289 /* HFPCLK clock integration */
290 
291 unsigned long sifive_prci_hfpclkplldiv_recalc_rate(struct clk_hw *hw,
292 						   unsigned long parent_rate)
293 {
294 	struct __prci_clock *pc = clk_hw_to_prci_clock(hw);
295 	struct __prci_data *pd = pc->pd;
296 	u32 div = __prci_readl(pd, PRCI_HFPCLKPLLDIV_OFFSET);
297 
298 	return div_u64(parent_rate, div + 2);
299 }
300 
301 /*
302  * Core clock mux control
303  */
304 
305 /**
306  * sifive_prci_coreclksel_use_hfclk() - switch the CORECLK mux to output HFCLK
307  * @pd: struct __prci_data * for the PRCI containing the CORECLK mux reg
308  *
309  * Switch the CORECLK mux to the HFCLK input source; return once complete.
310  *
311  * Context: Any context.  Caller must prevent concurrent changes to the
312  *          PRCI_CORECLKSEL_OFFSET register.
313  */
314 void sifive_prci_coreclksel_use_hfclk(struct __prci_data *pd)
315 {
316 	u32 r;
317 
318 	r = __prci_readl(pd, PRCI_CORECLKSEL_OFFSET);
319 	r |= PRCI_CORECLKSEL_CORECLKSEL_MASK;
320 	__prci_writel(r, PRCI_CORECLKSEL_OFFSET, pd);
321 
322 	r = __prci_readl(pd, PRCI_CORECLKSEL_OFFSET);	/* barrier */
323 }
324 
325 /**
326  * sifive_prci_coreclksel_use_corepll() - switch the CORECLK mux to output
327  * COREPLL
328  * @pd: struct __prci_data * for the PRCI containing the CORECLK mux reg
329  *
330  * Switch the CORECLK mux to the COREPLL output clock; return once complete.
331  *
332  * Context: Any context.  Caller must prevent concurrent changes to the
333  *          PRCI_CORECLKSEL_OFFSET register.
334  */
335 void sifive_prci_coreclksel_use_corepll(struct __prci_data *pd)
336 {
337 	u32 r;
338 
339 	r = __prci_readl(pd, PRCI_CORECLKSEL_OFFSET);
340 	r &= ~PRCI_CORECLKSEL_CORECLKSEL_MASK;
341 	__prci_writel(r, PRCI_CORECLKSEL_OFFSET, pd);
342 
343 	r = __prci_readl(pd, PRCI_CORECLKSEL_OFFSET);	/* barrier */
344 }
345 
346 /**
347  * sifive_prci_coreclksel_use_final_corepll() - switch the CORECLK mux to output
348  * FINAL_COREPLL
349  * @pd: struct __prci_data * for the PRCI containing the CORECLK mux reg
350  *
351  * Switch the CORECLK mux to the final COREPLL output clock; return once
352  * complete.
353  *
354  * Context: Any context.  Caller must prevent concurrent changes to the
355  *          PRCI_CORECLKSEL_OFFSET register.
356  */
357 void sifive_prci_coreclksel_use_final_corepll(struct __prci_data *pd)
358 {
359 	u32 r;
360 
361 	r = __prci_readl(pd, PRCI_CORECLKSEL_OFFSET);
362 	r &= ~PRCI_CORECLKSEL_CORECLKSEL_MASK;
363 	__prci_writel(r, PRCI_CORECLKSEL_OFFSET, pd);
364 
365 	r = __prci_readl(pd, PRCI_CORECLKSEL_OFFSET);	/* barrier */
366 }
367 
368 /**
369  * sifive_prci_corepllsel_use_dvfscorepll() - switch the COREPLL mux to
370  * output DVFS_COREPLL
371  * @pd: struct __prci_data * for the PRCI containing the COREPLL mux reg
372  *
373  * Switch the COREPLL mux to the DVFSCOREPLL output clock; return once complete.
374  *
375  * Context: Any context.  Caller must prevent concurrent changes to the
376  *          PRCI_COREPLLSEL_OFFSET register.
377  */
378 void sifive_prci_corepllsel_use_dvfscorepll(struct __prci_data *pd)
379 {
380 	u32 r;
381 
382 	r = __prci_readl(pd, PRCI_COREPLLSEL_OFFSET);
383 	r |= PRCI_COREPLLSEL_COREPLLSEL_MASK;
384 	__prci_writel(r, PRCI_COREPLLSEL_OFFSET, pd);
385 
386 	r = __prci_readl(pd, PRCI_COREPLLSEL_OFFSET);	/* barrier */
387 }
388 
389 /**
390  * sifive_prci_corepllsel_use_corepll() - switch the COREPLL mux to
391  * output COREPLL
392  * @pd: struct __prci_data * for the PRCI containing the COREPLL mux reg
393  *
394  * Switch the COREPLL mux to the COREPLL output clock; return once complete.
395  *
396  * Context: Any context.  Caller must prevent concurrent changes to the
397  *          PRCI_COREPLLSEL_OFFSET register.
398  */
399 void sifive_prci_corepllsel_use_corepll(struct __prci_data *pd)
400 {
401 	u32 r;
402 
403 	r = __prci_readl(pd, PRCI_COREPLLSEL_OFFSET);
404 	r &= ~PRCI_COREPLLSEL_COREPLLSEL_MASK;
405 	__prci_writel(r, PRCI_COREPLLSEL_OFFSET, pd);
406 
407 	r = __prci_readl(pd, PRCI_COREPLLSEL_OFFSET);	/* barrier */
408 }
409 
410 /**
411  * sifive_prci_hfpclkpllsel_use_hfclk() - switch the HFPCLKPLL mux to
412  * output HFCLK
413  * @pd: struct __prci_data * for the PRCI containing the HFPCLKPLL mux reg
414  *
415  * Switch the HFPCLKPLL mux to the HFCLK input source; return once complete.
416  *
417  * Context: Any context.  Caller must prevent concurrent changes to the
418  *          PRCI_HFPCLKPLLSEL_OFFSET register.
419  */
420 void sifive_prci_hfpclkpllsel_use_hfclk(struct __prci_data *pd)
421 {
422 	u32 r;
423 
424 	r = __prci_readl(pd, PRCI_HFPCLKPLLSEL_OFFSET);
425 	r |= PRCI_HFPCLKPLLSEL_HFPCLKPLLSEL_MASK;
426 	__prci_writel(r, PRCI_HFPCLKPLLSEL_OFFSET, pd);
427 
428 	r = __prci_readl(pd, PRCI_HFPCLKPLLSEL_OFFSET);	/* barrier */
429 }
430 
431 /**
432  * sifive_prci_hfpclkpllsel_use_hfpclkpll() - switch the HFPCLKPLL mux to
433  * output HFPCLKPLL
434  * @pd: struct __prci_data * for the PRCI containing the HFPCLKPLL mux reg
435  *
436  * Switch the HFPCLKPLL mux to the HFPCLKPLL output clock; return once complete.
437  *
438  * Context: Any context.  Caller must prevent concurrent changes to the
439  *          PRCI_HFPCLKPLLSEL_OFFSET register.
440  */
441 void sifive_prci_hfpclkpllsel_use_hfpclkpll(struct __prci_data *pd)
442 {
443 	u32 r;
444 
445 	r = __prci_readl(pd, PRCI_HFPCLKPLLSEL_OFFSET);
446 	r &= ~PRCI_HFPCLKPLLSEL_HFPCLKPLLSEL_MASK;
447 	__prci_writel(r, PRCI_HFPCLKPLLSEL_OFFSET, pd);
448 
449 	r = __prci_readl(pd, PRCI_HFPCLKPLLSEL_OFFSET);	/* barrier */
450 }
451 
452 /* PCIE AUX clock APIs for enable, disable. */
453 int sifive_prci_pcie_aux_clock_is_enabled(struct clk_hw *hw)
454 {
455 	struct __prci_clock *pc = clk_hw_to_prci_clock(hw);
456 	struct __prci_data *pd = pc->pd;
457 	u32 r;
458 
459 	r = __prci_readl(pd, PRCI_PCIE_AUX_OFFSET);
460 
461 	if (r & PRCI_PCIE_AUX_EN_MASK)
462 		return 1;
463 	else
464 		return 0;
465 }
466 
467 int sifive_prci_pcie_aux_clock_enable(struct clk_hw *hw)
468 {
469 	struct __prci_clock *pc = clk_hw_to_prci_clock(hw);
470 	struct __prci_data *pd = pc->pd;
471 	u32 r __maybe_unused;
472 
473 	if (sifive_prci_pcie_aux_clock_is_enabled(hw))
474 		return 0;
475 
476 	__prci_writel(1, PRCI_PCIE_AUX_OFFSET, pd);
477 	r = __prci_readl(pd, PRCI_PCIE_AUX_OFFSET);	/* barrier */
478 
479 	return 0;
480 }
481 
482 void sifive_prci_pcie_aux_clock_disable(struct clk_hw *hw)
483 {
484 	struct __prci_clock *pc = clk_hw_to_prci_clock(hw);
485 	struct __prci_data *pd = pc->pd;
486 	u32 r __maybe_unused;
487 
488 	__prci_writel(0, PRCI_PCIE_AUX_OFFSET, pd);
489 	r = __prci_readl(pd, PRCI_PCIE_AUX_OFFSET);	/* barrier */
490 
491 }
492 
493 /**
494  * __prci_register_clocks() - register clock controls in the PRCI
495  * @dev: Linux struct device
496  * @pd: The pointer for PRCI per-device instance data
497  * @desc: The pointer for the information of clocks of each SoCs
498  *
499  * Register the list of clock controls described in __prci_init_clocks[] with
500  * the Linux clock framework.
501  *
502  * Return: 0 upon success or a negative error code upon failure.
503  */
504 static int __prci_register_clocks(struct device *dev, struct __prci_data *pd,
505 				  const struct prci_clk_desc *desc)
506 {
507 	struct clk_init_data init = { };
508 	struct __prci_clock *pic;
509 	int parent_count, i, r;
510 
511 	parent_count = of_clk_get_parent_count(dev->of_node);
512 	if (parent_count != EXPECTED_CLK_PARENT_COUNT) {
513 		dev_err(dev, "expected only two parent clocks, found %d\n",
514 			parent_count);
515 		return -EINVAL;
516 	}
517 
518 	/* Register PLLs */
519 	for (i = 0; i < desc->num_clks; ++i) {
520 		pic = &(desc->clks[i]);
521 
522 		init.name = pic->name;
523 		init.parent_names = &pic->parent_name;
524 		init.num_parents = 1;
525 		init.ops = pic->ops;
526 		pic->hw.init = &init;
527 
528 		pic->pd = pd;
529 
530 		if (pic->pwd)
531 			__prci_wrpll_read_cfg0(pd, pic->pwd);
532 
533 		r = devm_clk_hw_register(dev, &pic->hw);
534 		if (r) {
535 			dev_warn(dev, "Failed to register clock %s: %d\n",
536 				 init.name, r);
537 			return r;
538 		}
539 
540 		r = clk_hw_register_clkdev(&pic->hw, pic->name, dev_name(dev));
541 		if (r) {
542 			dev_warn(dev, "Failed to register clkdev for %s: %d\n",
543 				 init.name, r);
544 			return r;
545 		}
546 
547 		pd->hw_clks.hws[i] = &pic->hw;
548 	}
549 
550 	pd->hw_clks.num = i;
551 
552 	r = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
553 					&pd->hw_clks);
554 	if (r) {
555 		dev_err(dev, "could not add hw_provider: %d\n", r);
556 		return r;
557 	}
558 
559 	return 0;
560 }
561 
562 /**
563  * sifive_prci_probe() - initialize prci data and check parent count
564  * @pdev: platform device pointer for the prci
565  *
566  * Return: 0 upon success or a negative error code upon failure.
567  */
568 static int sifive_prci_probe(struct platform_device *pdev)
569 {
570 	struct device *dev = &pdev->dev;
571 	struct __prci_data *pd;
572 	const struct prci_clk_desc *desc;
573 	int r;
574 
575 	desc = of_device_get_match_data(&pdev->dev);
576 
577 	pd = devm_kzalloc(dev, struct_size(pd, hw_clks.hws, desc->num_clks), GFP_KERNEL);
578 	if (!pd)
579 		return -ENOMEM;
580 
581 	pd->va = devm_platform_ioremap_resource(pdev, 0);
582 	if (IS_ERR(pd->va))
583 		return PTR_ERR(pd->va);
584 
585 	pd->reset.rcdev.owner = THIS_MODULE;
586 	pd->reset.rcdev.nr_resets = PRCI_RST_NR;
587 	pd->reset.rcdev.ops = &reset_simple_ops;
588 	pd->reset.rcdev.of_node = pdev->dev.of_node;
589 	pd->reset.active_low = true;
590 	pd->reset.membase = pd->va + PRCI_DEVICESRESETREG_OFFSET;
591 	spin_lock_init(&pd->reset.lock);
592 
593 	r = devm_reset_controller_register(&pdev->dev, &pd->reset.rcdev);
594 	if (r) {
595 		dev_err(dev, "could not register reset controller: %d\n", r);
596 		return r;
597 	}
598 	r = __prci_register_clocks(dev, pd, desc);
599 	if (r) {
600 		dev_err(dev, "could not register clocks: %d\n", r);
601 		return r;
602 	}
603 
604 	dev_dbg(dev, "SiFive PRCI probed\n");
605 
606 	return 0;
607 }
608 
609 static const struct of_device_id sifive_prci_of_match[] = {
610 	{.compatible = "sifive,fu540-c000-prci", .data = &prci_clk_fu540},
611 	{.compatible = "sifive,fu740-c000-prci", .data = &prci_clk_fu740},
612 	{}
613 };
614 
615 static struct platform_driver sifive_prci_driver = {
616 	.driver = {
617 		.name = "sifive-clk-prci",
618 		.of_match_table = sifive_prci_of_match,
619 	},
620 	.probe = sifive_prci_probe,
621 };
622 module_platform_driver(sifive_prci_driver);
623 
624 MODULE_AUTHOR("Paul Walmsley <paul.walmsley@sifive.com>");
625 MODULE_DESCRIPTION("SiFive Power Reset Clock Interface (PRCI) driver");
626 MODULE_LICENSE("GPL");
627