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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Russell Kingf8ce2542006-01-07 16:15:52 +00002 * linux/include/linux/clk.h
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * Copyright (C) 2004 ARM Limited.
5 * Written by Deep Blue Solutions Limited.
Mike Turquetteb24764902012-03-15 23:11:19 -07006 * Copyright (C) 2011-2012 Linaro Ltd <mturquette@linaro.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
Todd Poynor686f8c52006-03-25 18:15:24 +000012#ifndef __LINUX_CLK_H
13#define __LINUX_CLK_H
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
Shawn Guo9f1612d2012-07-18 11:52:22 +080015#include <linux/err.h>
Russell King40d3e0f2011-09-22 11:30:50 +010016#include <linux/kernel.h>
Mike Turquetteb24764902012-03-15 23:11:19 -070017#include <linux/notifier.h>
Russell King40d3e0f2011-09-22 11:30:50 +010018
Linus Torvalds1da177e2005-04-16 15:20:36 -070019struct device;
Linus Torvalds1da177e2005-04-16 15:20:36 -070020struct clk;
Kuninori Morimoto71a2f112016-12-05 05:23:20 +000021struct device_node;
22struct of_phandle_args;
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
Mike Turquetteb24764902012-03-15 23:11:19 -070024/**
25 * DOC: clk notifier callback types
26 *
27 * PRE_RATE_CHANGE - called immediately before the clk rate is changed,
28 * to indicate that the rate change will proceed. Drivers must
29 * immediately terminate any operations that will be affected by the
Soren Brinkmannfb72a052013-04-03 12:17:12 -070030 * rate change. Callbacks may either return NOTIFY_DONE, NOTIFY_OK,
31 * NOTIFY_STOP or NOTIFY_BAD.
Mike Turquetteb24764902012-03-15 23:11:19 -070032 *
33 * ABORT_RATE_CHANGE: called if the rate change failed for some reason
34 * after PRE_RATE_CHANGE. In this case, all registered notifiers on
35 * the clk will be called with ABORT_RATE_CHANGE. Callbacks must
Soren Brinkmannfb72a052013-04-03 12:17:12 -070036 * always return NOTIFY_DONE or NOTIFY_OK.
Mike Turquetteb24764902012-03-15 23:11:19 -070037 *
38 * POST_RATE_CHANGE - called after the clk rate change has successfully
Soren Brinkmannfb72a052013-04-03 12:17:12 -070039 * completed. Callbacks must always return NOTIFY_DONE or NOTIFY_OK.
Mike Turquetteb24764902012-03-15 23:11:19 -070040 *
41 */
42#define PRE_RATE_CHANGE BIT(0)
43#define POST_RATE_CHANGE BIT(1)
44#define ABORT_RATE_CHANGE BIT(2)
45
46/**
47 * struct clk_notifier - associate a clk with a notifier
48 * @clk: struct clk * to associate the notifier with
49 * @notifier_head: a blocking_notifier_head for this clk
50 * @node: linked list pointers
51 *
52 * A list of struct clk_notifier is maintained by the notifier code.
53 * An entry is created whenever code registers the first notifier on a
54 * particular @clk. Future notifiers on that @clk are added to the
55 * @notifier_head.
56 */
57struct clk_notifier {
58 struct clk *clk;
59 struct srcu_notifier_head notifier_head;
60 struct list_head node;
61};
62
63/**
64 * struct clk_notifier_data - rate data to pass to the notifier callback
65 * @clk: struct clk * being changed
66 * @old_rate: previous rate of this clk
67 * @new_rate: new rate of this clk
68 *
69 * For a pre-notifier, old_rate is the clk's rate before this rate
70 * change, and new_rate is what the rate will be in the future. For a
71 * post-notifier, old_rate and new_rate are both set to the clk's
72 * current rate (this was done to optimize the implementation).
73 */
74struct clk_notifier_data {
75 struct clk *clk;
76 unsigned long old_rate;
77 unsigned long new_rate;
78};
79
Dong Aisheng266e4e92017-05-19 21:49:04 +080080/**
81 * struct clk_bulk_data - Data used for bulk clk operations.
82 *
83 * @id: clock consumer ID
84 * @clk: struct clk * to store the associated clock
85 *
86 * The CLK APIs provide a series of clk_bulk_() API calls as
87 * a convenience to consumers which require multiple clks. This
88 * structure is used to manage data for these calls.
89 */
90struct clk_bulk_data {
91 const char *id;
92 struct clk *clk;
93};
94
Krzysztof Kozlowskie81b87d2016-06-28 13:25:04 +020095#ifdef CONFIG_COMMON_CLK
96
Mike Turquette86bcfa22014-02-24 16:08:41 -080097/**
98 * clk_notifier_register: register a clock rate-change notifier callback
99 * @clk: clock whose rate we are interested in
100 * @nb: notifier block with callback function pointer
101 *
102 * ProTip: debugging across notifier chains can be frustrating. Make sure that
103 * your notifier callback function prints a nice big warning in case of
104 * failure.
105 */
Mike Turquetteb24764902012-03-15 23:11:19 -0700106int clk_notifier_register(struct clk *clk, struct notifier_block *nb);
107
Mike Turquette86bcfa22014-02-24 16:08:41 -0800108/**
109 * clk_notifier_unregister: unregister a clock rate-change notifier callback
110 * @clk: clock whose rate we are no longer interested in
111 * @nb: notifier block which will be unregistered
112 */
Mike Turquetteb24764902012-03-15 23:11:19 -0700113int clk_notifier_unregister(struct clk *clk, struct notifier_block *nb);
114
Boris BREZILLON5279fc42013-12-21 10:34:47 +0100115/**
116 * clk_get_accuracy - obtain the clock accuracy in ppb (parts per billion)
117 * for a clock source.
118 * @clk: clock source
119 *
120 * This gets the clock source accuracy expressed in ppb.
121 * A perfect clock returns 0.
122 */
123long clk_get_accuracy(struct clk *clk);
124
Mike Turquettee59c5372014-02-18 21:21:25 -0800125/**
126 * clk_set_phase - adjust the phase shift of a clock signal
127 * @clk: clock signal source
128 * @degrees: number of degrees the signal is shifted
129 *
130 * Shifts the phase of a clock signal by the specified degrees. Returns 0 on
131 * success, -EERROR otherwise.
132 */
133int clk_set_phase(struct clk *clk, int degrees);
134
135/**
136 * clk_get_phase - return the phase shift of a clock signal
137 * @clk: clock signal source
138 *
139 * Returns the phase shift of a clock node in degrees, otherwise returns
140 * -EERROR.
141 */
142int clk_get_phase(struct clk *clk);
143
Michael Turquette3d3801e2015-02-25 09:11:01 -0800144/**
145 * clk_is_match - check if two clk's point to the same hardware clock
146 * @p: clk compared against q
147 * @q: clk compared against p
148 *
149 * Returns true if the two struct clk pointers both point to the same hardware
mchehab@s-opensource.com0e056eb2017-03-30 17:11:36 -0300150 * clock node. Put differently, returns true if @p and @q
151 * share the same &struct clk_core object.
Michael Turquette3d3801e2015-02-25 09:11:01 -0800152 *
153 * Returns false otherwise. Note that two NULL clks are treated as matching.
154 */
155bool clk_is_match(const struct clk *p, const struct clk *q);
156
Boris BREZILLON5279fc42013-12-21 10:34:47 +0100157#else
158
Krzysztof Kozlowskie81b87d2016-06-28 13:25:04 +0200159static inline int clk_notifier_register(struct clk *clk,
160 struct notifier_block *nb)
161{
162 return -ENOTSUPP;
163}
164
165static inline int clk_notifier_unregister(struct clk *clk,
166 struct notifier_block *nb)
167{
168 return -ENOTSUPP;
169}
170
Boris BREZILLON5279fc42013-12-21 10:34:47 +0100171static inline long clk_get_accuracy(struct clk *clk)
172{
173 return -ENOTSUPP;
174}
175
Mike Turquettee59c5372014-02-18 21:21:25 -0800176static inline long clk_set_phase(struct clk *clk, int phase)
177{
178 return -ENOTSUPP;
179}
180
181static inline long clk_get_phase(struct clk *clk)
182{
183 return -ENOTSUPP;
184}
185
Michael Turquette3d3801e2015-02-25 09:11:01 -0800186static inline bool clk_is_match(const struct clk *p, const struct clk *q)
187{
188 return p == q;
189}
190
Mark Brown7e87aed2012-04-01 15:31:23 +0100191#endif
Mike Turquetteb24764902012-03-15 23:11:19 -0700192
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193/**
Viresh Kumar93abe8e2012-07-30 14:39:27 -0700194 * clk_prepare - prepare a clock source
195 * @clk: clock source
196 *
197 * This prepares the clock source for use.
198 *
199 * Must not be called from within atomic context.
200 */
201#ifdef CONFIG_HAVE_CLK_PREPARE
202int clk_prepare(struct clk *clk);
Dong Aisheng266e4e92017-05-19 21:49:04 +0800203int __must_check clk_bulk_prepare(int num_clks,
204 const struct clk_bulk_data *clks);
Viresh Kumar93abe8e2012-07-30 14:39:27 -0700205#else
206static inline int clk_prepare(struct clk *clk)
207{
208 might_sleep();
209 return 0;
210}
Dong Aisheng266e4e92017-05-19 21:49:04 +0800211
212static inline int clk_bulk_prepare(int num_clks, struct clk_bulk_data *clks)
213{
214 might_sleep();
215 return 0;
216}
Viresh Kumar93abe8e2012-07-30 14:39:27 -0700217#endif
218
219/**
220 * clk_unprepare - undo preparation of a clock source
221 * @clk: clock source
222 *
223 * This undoes a previously prepared clock. The caller must balance
224 * the number of prepare and unprepare calls.
225 *
226 * Must not be called from within atomic context.
227 */
228#ifdef CONFIG_HAVE_CLK_PREPARE
229void clk_unprepare(struct clk *clk);
Dong Aisheng266e4e92017-05-19 21:49:04 +0800230void clk_bulk_unprepare(int num_clks, const struct clk_bulk_data *clks);
Viresh Kumar93abe8e2012-07-30 14:39:27 -0700231#else
232static inline void clk_unprepare(struct clk *clk)
233{
234 might_sleep();
235}
Dong Aisheng266e4e92017-05-19 21:49:04 +0800236static inline void clk_bulk_unprepare(int num_clks, struct clk_bulk_data *clks)
237{
238 might_sleep();
239}
Viresh Kumar93abe8e2012-07-30 14:39:27 -0700240#endif
241
242#ifdef CONFIG_HAVE_CLK
243/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 * clk_get - lookup and obtain a reference to a clock producer.
245 * @dev: device for clock "consumer"
Jan-Simon Möllera58b3a42012-07-23 20:48:56 +0200246 * @id: clock consumer ID
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 *
248 * Returns a struct clk corresponding to the clock producer, or
Russell Kingea3f4ea2005-04-27 18:19:55 +0100249 * valid IS_ERR() condition containing errno. The implementation
250 * uses @dev and @id to determine the clock consumer, and thereby
251 * the clock producer. (IOW, @id may be identical strings, but
252 * clk_get may return different clock producers depending on @dev.)
Russell Kingf47fc0a2006-01-03 18:34:20 +0000253 *
254 * Drivers must assume that the clock source is not enabled.
Alex Raimondif7ad1602008-10-15 22:02:03 -0700255 *
256 * clk_get should not be called from within interrupt context.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 */
258struct clk *clk_get(struct device *dev, const char *id);
259
260/**
Dong Aisheng266e4e92017-05-19 21:49:04 +0800261 * clk_bulk_get - lookup and obtain a number of references to clock producer.
262 * @dev: device for clock "consumer"
263 * @num_clks: the number of clk_bulk_data
264 * @clks: the clk_bulk_data table of consumer
265 *
266 * This helper function allows drivers to get several clk consumers in one
267 * operation. If any of the clk cannot be acquired then any clks
268 * that were obtained will be freed before returning to the caller.
269 *
270 * Returns 0 if all clocks specified in clk_bulk_data table are obtained
271 * successfully, or valid IS_ERR() condition containing errno.
272 * The implementation uses @dev and @clk_bulk_data.id to determine the
273 * clock consumer, and thereby the clock producer.
274 * The clock returned is stored in each @clk_bulk_data.clk field.
275 *
276 * Drivers must assume that the clock source is not enabled.
277 *
278 * clk_bulk_get should not be called from within interrupt context.
279 */
280int __must_check clk_bulk_get(struct device *dev, int num_clks,
281 struct clk_bulk_data *clks);
282
283/**
Mark Browna8a97db2012-04-05 11:42:09 +0100284 * devm_clk_get - lookup and obtain a managed reference to a clock producer.
285 * @dev: device for clock "consumer"
Jan-Simon Möllera58b3a42012-07-23 20:48:56 +0200286 * @id: clock consumer ID
Mark Browna8a97db2012-04-05 11:42:09 +0100287 *
288 * Returns a struct clk corresponding to the clock producer, or
289 * valid IS_ERR() condition containing errno. The implementation
290 * uses @dev and @id to determine the clock consumer, and thereby
291 * the clock producer. (IOW, @id may be identical strings, but
292 * clk_get may return different clock producers depending on @dev.)
293 *
294 * Drivers must assume that the clock source is not enabled.
295 *
296 * devm_clk_get should not be called from within interrupt context.
297 *
298 * The clock will automatically be freed when the device is unbound
299 * from the bus.
300 */
301struct clk *devm_clk_get(struct device *dev, const char *id);
302
303/**
Kuninori Morimoto71a2f112016-12-05 05:23:20 +0000304 * devm_get_clk_from_child - lookup and obtain a managed reference to a
305 * clock producer from child node.
306 * @dev: device for clock "consumer"
307 * @np: pointer to clock consumer node
308 * @con_id: clock consumer ID
309 *
310 * This function parses the clocks, and uses them to look up the
311 * struct clk from the registered list of clock providers by using
312 * @np and @con_id
313 *
314 * The clock will automatically be freed when the device is unbound
315 * from the bus.
316 */
317struct clk *devm_get_clk_from_child(struct device *dev,
318 struct device_node *np, const char *con_id);
319
320/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 * clk_enable - inform the system when the clock source should be running.
322 * @clk: clock source
323 *
324 * If the clock can not be enabled/disabled, this should return success.
325 *
Russell King40d3e0f2011-09-22 11:30:50 +0100326 * May be called from atomic contexts.
327 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 * Returns success (0) or negative errno.
329 */
330int clk_enable(struct clk *clk);
331
332/**
Dong Aisheng266e4e92017-05-19 21:49:04 +0800333 * clk_bulk_enable - inform the system when the set of clks should be running.
334 * @num_clks: the number of clk_bulk_data
335 * @clks: the clk_bulk_data table of consumer
336 *
337 * May be called from atomic contexts.
338 *
339 * Returns success (0) or negative errno.
340 */
341int __must_check clk_bulk_enable(int num_clks,
342 const struct clk_bulk_data *clks);
343
344/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 * clk_disable - inform the system when the clock source is no longer required.
346 * @clk: clock source
Russell Kingf47fc0a2006-01-03 18:34:20 +0000347 *
348 * Inform the system that a clock source is no longer required by
349 * a driver and may be shut down.
350 *
Russell King40d3e0f2011-09-22 11:30:50 +0100351 * May be called from atomic contexts.
352 *
Russell Kingf47fc0a2006-01-03 18:34:20 +0000353 * Implementation detail: if the clock source is shared between
354 * multiple drivers, clk_enable() calls must be balanced by the
355 * same number of clk_disable() calls for the clock source to be
356 * disabled.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 */
358void clk_disable(struct clk *clk);
359
360/**
Dong Aisheng266e4e92017-05-19 21:49:04 +0800361 * clk_bulk_disable - inform the system when the set of clks is no
362 * longer required.
363 * @num_clks: the number of clk_bulk_data
364 * @clks: the clk_bulk_data table of consumer
365 *
366 * Inform the system that a set of clks is no longer required by
367 * a driver and may be shut down.
368 *
369 * May be called from atomic contexts.
370 *
371 * Implementation detail: if the set of clks is shared between
372 * multiple drivers, clk_bulk_enable() calls must be balanced by the
373 * same number of clk_bulk_disable() calls for the clock source to be
374 * disabled.
375 */
376void clk_bulk_disable(int num_clks, const struct clk_bulk_data *clks);
377
378/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 * clk_get_rate - obtain the current clock rate (in Hz) for a clock source.
380 * This is only valid once the clock source has been enabled.
381 * @clk: clock source
382 */
383unsigned long clk_get_rate(struct clk *clk);
384
385/**
386 * clk_put - "free" the clock source
387 * @clk: clock source
Russell Kingf47fc0a2006-01-03 18:34:20 +0000388 *
389 * Note: drivers must ensure that all clk_enable calls made on this
390 * clock source are balanced by clk_disable calls prior to calling
391 * this function.
Alex Raimondif7ad1602008-10-15 22:02:03 -0700392 *
393 * clk_put should not be called from within interrupt context.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 */
395void clk_put(struct clk *clk);
396
Mark Browna8a97db2012-04-05 11:42:09 +0100397/**
Dong Aisheng266e4e92017-05-19 21:49:04 +0800398 * clk_bulk_put - "free" the clock source
399 * @num_clks: the number of clk_bulk_data
400 * @clks: the clk_bulk_data table of consumer
401 *
402 * Note: drivers must ensure that all clk_bulk_enable calls made on this
403 * clock source are balanced by clk_bulk_disable calls prior to calling
404 * this function.
405 *
406 * clk_bulk_put should not be called from within interrupt context.
407 */
408void clk_bulk_put(int num_clks, struct clk_bulk_data *clks);
409
410/**
Mark Browna8a97db2012-04-05 11:42:09 +0100411 * devm_clk_put - "free" a managed clock source
Masanari Iidada3dae52014-09-09 01:27:23 +0900412 * @dev: device used to acquire the clock
Mark Browna8a97db2012-04-05 11:42:09 +0100413 * @clk: clock source acquired with devm_clk_get()
414 *
415 * Note: drivers must ensure that all clk_enable calls made on this
416 * clock source are balanced by clk_disable calls prior to calling
417 * this function.
418 *
419 * clk_put should not be called from within interrupt context.
420 */
421void devm_clk_put(struct device *dev, struct clk *clk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
423/*
424 * The remaining APIs are optional for machine class support.
425 */
426
427
428/**
429 * clk_round_rate - adjust a rate to the exact rate a clock can provide
430 * @clk: clock source
431 * @rate: desired clock rate in Hz
432 *
Russell Kingd2d14a72015-03-14 15:12:35 +0000433 * This answers the question "if I were to pass @rate to clk_set_rate(),
434 * what clock rate would I end up with?" without changing the hardware
435 * in any way. In other words:
436 *
437 * rate = clk_round_rate(clk, r);
438 *
439 * and:
440 *
441 * clk_set_rate(clk, r);
442 * rate = clk_get_rate(clk);
443 *
444 * are equivalent except the former does not modify the clock hardware
445 * in any way.
446 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 * Returns rounded clock rate in Hz, or negative errno.
448 */
449long clk_round_rate(struct clk *clk, unsigned long rate);
Rob Herring8b7730d2012-04-09 15:24:59 -0500450
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451/**
452 * clk_set_rate - set the clock rate for a clock source
453 * @clk: clock source
454 * @rate: desired clock rate in Hz
455 *
456 * Returns success (0) or negative errno.
457 */
458int clk_set_rate(struct clk *clk, unsigned long rate);
Rob Herring8b7730d2012-04-09 15:24:59 -0500459
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460/**
Thierry Reding4e88f3d2015-01-21 17:13:00 +0100461 * clk_has_parent - check if a clock is a possible parent for another
462 * @clk: clock source
463 * @parent: parent clock source
464 *
465 * This function can be used in drivers that need to check that a clock can be
466 * the parent of another without actually changing the parent.
467 *
468 * Returns true if @parent is a possible parent for @clk, false otherwise.
469 */
470bool clk_has_parent(struct clk *clk, struct clk *parent);
471
472/**
Tomeu Vizoso1c8e6002015-01-23 12:03:31 +0100473 * clk_set_rate_range - set a rate range for a clock source
474 * @clk: clock source
475 * @min: desired minimum clock rate in Hz, inclusive
476 * @max: desired maximum clock rate in Hz, inclusive
477 *
478 * Returns success (0) or negative errno.
479 */
480int clk_set_rate_range(struct clk *clk, unsigned long min, unsigned long max);
481
482/**
483 * clk_set_min_rate - set a minimum clock rate for a clock source
484 * @clk: clock source
485 * @rate: desired minimum clock rate in Hz, inclusive
486 *
487 * Returns success (0) or negative errno.
488 */
489int clk_set_min_rate(struct clk *clk, unsigned long rate);
490
491/**
492 * clk_set_max_rate - set a maximum clock rate for a clock source
493 * @clk: clock source
494 * @rate: desired maximum clock rate in Hz, inclusive
495 *
496 * Returns success (0) or negative errno.
497 */
498int clk_set_max_rate(struct clk *clk, unsigned long rate);
499
500/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 * clk_set_parent - set the parent clock source for this clock
502 * @clk: clock source
503 * @parent: parent clock source
504 *
505 * Returns success (0) or negative errno.
506 */
507int clk_set_parent(struct clk *clk, struct clk *parent);
508
509/**
510 * clk_get_parent - get the parent clock source for this clock
511 * @clk: clock source
512 *
513 * Returns struct clk corresponding to parent clock source, or
514 * valid IS_ERR() condition containing errno.
515 */
516struct clk *clk_get_parent(struct clk *clk);
517
Sascha Hauer05fd8e732009-03-07 12:55:49 +0100518/**
519 * clk_get_sys - get a clock based upon the device name
520 * @dev_id: device name
521 * @con_id: connection ID
522 *
523 * Returns a struct clk corresponding to the clock producer, or
524 * valid IS_ERR() condition containing errno. The implementation
525 * uses @dev_id and @con_id to determine the clock consumer, and
526 * thereby the clock producer. In contrast to clk_get() this function
527 * takes the device name instead of the device itself for identification.
528 *
529 * Drivers must assume that the clock source is not enabled.
530 *
531 * clk_get_sys should not be called from within interrupt context.
532 */
533struct clk *clk_get_sys(const char *dev_id, const char *con_id);
534
Viresh Kumar93abe8e2012-07-30 14:39:27 -0700535#else /* !CONFIG_HAVE_CLK */
536
537static inline struct clk *clk_get(struct device *dev, const char *id)
538{
539 return NULL;
540}
541
Dong Aisheng266e4e92017-05-19 21:49:04 +0800542static inline int clk_bulk_get(struct device *dev, int num_clks,
543 struct clk_bulk_data *clks)
544{
545 return 0;
546}
547
Viresh Kumar93abe8e2012-07-30 14:39:27 -0700548static inline struct clk *devm_clk_get(struct device *dev, const char *id)
549{
550 return NULL;
551}
552
Kuninori Morimoto71a2f112016-12-05 05:23:20 +0000553static inline struct clk *devm_get_clk_from_child(struct device *dev,
554 struct device_node *np, const char *con_id)
555{
556 return NULL;
557}
558
Viresh Kumar93abe8e2012-07-30 14:39:27 -0700559static inline void clk_put(struct clk *clk) {}
560
Dong Aisheng266e4e92017-05-19 21:49:04 +0800561static inline void clk_bulk_put(int num_clks, struct clk_bulk_data *clks) {}
562
Viresh Kumar93abe8e2012-07-30 14:39:27 -0700563static inline void devm_clk_put(struct device *dev, struct clk *clk) {}
564
565static inline int clk_enable(struct clk *clk)
566{
567 return 0;
568}
569
Dong Aisheng266e4e92017-05-19 21:49:04 +0800570static inline int clk_bulk_enable(int num_clks, struct clk_bulk_data *clks)
571{
572 return 0;
573}
574
Viresh Kumar93abe8e2012-07-30 14:39:27 -0700575static inline void clk_disable(struct clk *clk) {}
576
Dong Aisheng266e4e92017-05-19 21:49:04 +0800577
578static inline void clk_bulk_disable(int num_clks,
579 struct clk_bulk_data *clks) {}
580
Viresh Kumar93abe8e2012-07-30 14:39:27 -0700581static inline unsigned long clk_get_rate(struct clk *clk)
582{
583 return 0;
584}
585
586static inline int clk_set_rate(struct clk *clk, unsigned long rate)
587{
588 return 0;
589}
590
591static inline long clk_round_rate(struct clk *clk, unsigned long rate)
592{
593 return 0;
594}
595
Thierry Reding4e88f3d2015-01-21 17:13:00 +0100596static inline bool clk_has_parent(struct clk *clk, struct clk *parent)
597{
598 return true;
599}
600
Viresh Kumar93abe8e2012-07-30 14:39:27 -0700601static inline int clk_set_parent(struct clk *clk, struct clk *parent)
602{
603 return 0;
604}
605
606static inline struct clk *clk_get_parent(struct clk *clk)
607{
608 return NULL;
609}
610
Daniel Lezcanob81ea962016-06-02 22:44:49 +0200611static inline struct clk *clk_get_sys(const char *dev_id, const char *con_id)
612{
613 return NULL;
614}
Viresh Kumar93abe8e2012-07-30 14:39:27 -0700615#endif
616
617/* clk_prepare_enable helps cases using clk_enable in non-atomic context. */
618static inline int clk_prepare_enable(struct clk *clk)
619{
620 int ret;
621
622 ret = clk_prepare(clk);
623 if (ret)
624 return ret;
625 ret = clk_enable(clk);
626 if (ret)
627 clk_unprepare(clk);
628
629 return ret;
630}
631
632/* clk_disable_unprepare helps cases using clk_disable in non-atomic context. */
633static inline void clk_disable_unprepare(struct clk *clk)
634{
635 clk_disable(clk);
636 clk_unprepare(clk);
637}
638
Rob Herring137f8a72012-07-18 11:52:23 +0800639#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
Grant Likely766e6a42012-04-09 14:50:06 -0500640struct clk *of_clk_get(struct device_node *np, int index);
641struct clk *of_clk_get_by_name(struct device_node *np, const char *name);
642struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec);
643#else
644static inline struct clk *of_clk_get(struct device_node *np, int index)
645{
Shawn Guo9f1612d2012-07-18 11:52:22 +0800646 return ERR_PTR(-ENOENT);
Grant Likely766e6a42012-04-09 14:50:06 -0500647}
648static inline struct clk *of_clk_get_by_name(struct device_node *np,
649 const char *name)
650{
Shawn Guo9f1612d2012-07-18 11:52:22 +0800651 return ERR_PTR(-ENOENT);
Grant Likely766e6a42012-04-09 14:50:06 -0500652}
653#endif
654
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655#endif