1 /* SPDX-License-Identifier: GPL-2.0 */
6 #ifndef __LINUX_CLK_PROVIDER_H
7 #define __LINUX_CLK_PROVIDER_H
10 #include <linux/of_clk.h>
13 * flags used across common struct clk. these flags should only affect the
14 * top-level framework. custom flags for dealing with hardware specifics
15 * belong in struct clk_foo
17 * Please update clk_flags[] in drivers/clk/clk.c when making changes here!
19 #define CLK_SET_RATE_GATE BIT(0) /* must be gated across rate change */
20 #define CLK_SET_PARENT_GATE BIT(1) /* must be gated across re-parent */
21 #define CLK_SET_RATE_PARENT BIT(2) /* propagate rate change up one level */
22 #define CLK_IGNORE_UNUSED BIT(3) /* do not gate even if unused */
25 #define CLK_GET_RATE_NOCACHE BIT(6) /* do not use the cached clk rate */
26 #define CLK_SET_RATE_NO_REPARENT BIT(7) /* don't re-parent on rate change */
27 #define CLK_GET_ACCURACY_NOCACHE BIT(8) /* do not use the cached clk accuracy */
28 #define CLK_RECALC_NEW_RATES BIT(9) /* recalc rates after notifications */
29 #define CLK_SET_RATE_UNGATE BIT(10) /* clock needs to run to set rate */
30 #define CLK_IS_CRITICAL BIT(11) /* do not gate, ever */
31 /* parents need enable during gate/ungate, set rate and re-parent */
32 #define CLK_OPS_PARENT_ENABLE BIT(12)
33 /* duty cycle call may be forwarded to the parent clock */
34 #define CLK_DUTY_CYCLE_PARENT BIT(13)
42 * struct clk_rate_request - Structure encoding the clk constraints that
43 * a clock user might require.
45 * @rate: Requested clock rate. This field will be adjusted by
46 * clock drivers according to hardware capabilities.
47 * @min_rate: Minimum rate imposed by clk users.
48 * @max_rate: Maximum rate imposed by clk users.
49 * @best_parent_rate: The best parent rate a parent can provide to fulfill the
50 * requested constraints.
51 * @best_parent_hw: The most appropriate parent clock that fulfills the
52 * requested constraints.
55 struct clk_rate_request {
57 unsigned long min_rate;
58 unsigned long max_rate;
59 unsigned long best_parent_rate;
60 struct clk_hw *best_parent_hw;
64 * struct clk_duty - Struture encoding the duty cycle ratio of a clock
66 * @num: Numerator of the duty cycle ratio
67 * @den: Denominator of the duty cycle ratio
75 * struct clk_ops - Callback operations for hardware clocks; these are to
76 * be provided by the clock implementation, and will be called by drivers
77 * through the clk_* api.
79 * @prepare: Prepare the clock for enabling. This must not return until
80 * the clock is fully prepared, and it's safe to call clk_enable.
81 * This callback is intended to allow clock implementations to
82 * do any initialisation that may sleep. Called with
85 * @unprepare: Release the clock from its prepared state. This will typically
86 * undo any work done in the @prepare callback. Called with
89 * @is_prepared: Queries the hardware to determine if the clock is prepared.
90 * This function is allowed to sleep. Optional, if this op is not
91 * set then the prepare count will be used.
93 * @unprepare_unused: Unprepare the clock atomically. Only called from
94 * clk_disable_unused for prepare clocks with special needs.
95 * Called with prepare mutex held. This function may sleep.
97 * @enable: Enable the clock atomically. This must not return until the
98 * clock is generating a valid clock signal, usable by consumer
99 * devices. Called with enable_lock held. This function must not
102 * @disable: Disable the clock atomically. Called with enable_lock held.
103 * This function must not sleep.
105 * @is_enabled: Queries the hardware to determine if the clock is enabled.
106 * This function must not sleep. Optional, if this op is not
107 * set then the enable count will be used.
109 * @disable_unused: Disable the clock atomically. Only called from
110 * clk_disable_unused for gate clocks with special needs.
111 * Called with enable_lock held. This function must not
114 * @save_context: Save the context of the clock in prepration for poweroff.
116 * @restore_context: Restore the context of the clock after a restoration
119 * @recalc_rate Recalculate the rate of this clock, by querying hardware. The
120 * parent rate is an input parameter. It is up to the caller to
121 * ensure that the prepare_mutex is held across this call.
122 * Returns the calculated rate. Optional, but recommended - if
123 * this op is not set then clock rate will be initialized to 0.
125 * @round_rate: Given a target rate as input, returns the closest rate actually
126 * supported by the clock. The parent rate is an input/output
129 * @determine_rate: Given a target rate as input, returns the closest rate
130 * actually supported by the clock, and optionally the parent clock
131 * that should be used to provide the clock rate.
133 * @set_parent: Change the input source of this clock; for clocks with multiple
134 * possible parents specify a new parent by passing in the index
135 * as a u8 corresponding to the parent in either the .parent_names
136 * or .parents arrays. This function in affect translates an
137 * array index into the value programmed into the hardware.
138 * Returns 0 on success, -EERROR otherwise.
140 * @get_parent: Queries the hardware to determine the parent of a clock. The
141 * return value is a u8 which specifies the index corresponding to
142 * the parent clock. This index can be applied to either the
143 * .parent_names or .parents arrays. In short, this function
144 * translates the parent value read from hardware into an array
145 * index. Currently only called when the clock is initialized by
146 * __clk_init. This callback is mandatory for clocks with
147 * multiple parents. It is optional (and unnecessary) for clocks
148 * with 0 or 1 parents.
150 * @set_rate: Change the rate of this clock. The requested rate is specified
151 * by the second argument, which should typically be the return
152 * of .round_rate call. The third argument gives the parent rate
153 * which is likely helpful for most .set_rate implementation.
154 * Returns 0 on success, -EERROR otherwise.
156 * @set_rate_and_parent: Change the rate and the parent of this clock. The
157 * requested rate is specified by the second argument, which
158 * should typically be the return of .round_rate call. The
159 * third argument gives the parent rate which is likely helpful
160 * for most .set_rate_and_parent implementation. The fourth
161 * argument gives the parent index. This callback is optional (and
162 * unnecessary) for clocks with 0 or 1 parents as well as
163 * for clocks that can tolerate switching the rate and the parent
164 * separately via calls to .set_parent and .set_rate.
165 * Returns 0 on success, -EERROR otherwise.
167 * @recalc_accuracy: Recalculate the accuracy of this clock. The clock accuracy
168 * is expressed in ppb (parts per billion). The parent accuracy is
169 * an input parameter.
170 * Returns the calculated accuracy. Optional - if this op is not
171 * set then clock accuracy will be initialized to parent accuracy
172 * or 0 (perfect clock) if clock has no parent.
174 * @get_phase: Queries the hardware to get the current phase of a clock.
175 * Returned values are 0-359 degrees on success, negative
176 * error codes on failure.
178 * @set_phase: Shift the phase this clock signal in degrees specified
179 * by the second argument. Valid values for degrees are
180 * 0-359. Return 0 on success, otherwise -EERROR.
182 * @get_duty_cycle: Queries the hardware to get the current duty cycle ratio
183 * of a clock. Returned values denominator cannot be 0 and must be
184 * superior or equal to the numerator.
186 * @set_duty_cycle: Apply the duty cycle ratio to this clock signal specified by
187 * the numerator (2nd argurment) and denominator (3rd argument).
188 * Argument must be a valid ratio (denominator > 0
189 * and >= numerator) Return 0 on success, otherwise -EERROR.
191 * @init: Perform platform-specific initialization magic.
192 * This is not used by any of the basic clock types.
193 * This callback exist for HW which needs to perform some
194 * initialisation magic for CCF to get an accurate view of the
195 * clock. It may also be used dynamic resource allocation is
196 * required. It shall not used to deal with clock parameters,
197 * such as rate or parents.
198 * Returns 0 on success, -EERROR otherwise.
200 * @terminate: Free any resource allocated by init.
202 * @debug_init: Set up type-specific debugfs entries for this clock. This
203 * is called once, after the debugfs directory entry for this
204 * clock has been created. The dentry pointer representing that
205 * directory is provided as an argument. Called with
206 * prepare_lock held. Returns 0 on success, -EERROR otherwise.
209 * The clk_enable/clk_disable and clk_prepare/clk_unprepare pairs allow
210 * implementations to split any work between atomic (enable) and sleepable
211 * (prepare) contexts. If enabling a clock requires code that might sleep,
212 * this must be done in clk_prepare. Clock enable code that will never be
213 * called in a sleepable context may be implemented in clk_enable.
215 * Typically, drivers will call clk_prepare when a clock may be needed later
216 * (eg. when a device is opened), and clk_enable when the clock is actually
217 * required (eg. from an interrupt). Note that clk_prepare MUST have been
218 * called before clk_enable.
221 int (*prepare)(struct clk_hw *hw);
222 void (*unprepare)(struct clk_hw *hw);
223 int (*is_prepared)(struct clk_hw *hw);
224 void (*unprepare_unused)(struct clk_hw *hw);
225 int (*enable)(struct clk_hw *hw);
226 void (*disable)(struct clk_hw *hw);
227 int (*is_enabled)(struct clk_hw *hw);
228 void (*disable_unused)(struct clk_hw *hw);
229 int (*save_context)(struct clk_hw *hw);
230 void (*restore_context)(struct clk_hw *hw);
231 unsigned long (*recalc_rate)(struct clk_hw *hw,
232 unsigned long parent_rate);
233 long (*round_rate)(struct clk_hw *hw, unsigned long rate,
234 unsigned long *parent_rate);
235 int (*determine_rate)(struct clk_hw *hw,
236 struct clk_rate_request *req);
237 int (*set_parent)(struct clk_hw *hw, u8 index);
238 u8 (*get_parent)(struct clk_hw *hw);
239 int (*set_rate)(struct clk_hw *hw, unsigned long rate,
240 unsigned long parent_rate);
241 int (*set_rate_and_parent)(struct clk_hw *hw,
243 unsigned long parent_rate, u8 index);
244 unsigned long (*recalc_accuracy)(struct clk_hw *hw,
245 unsigned long parent_accuracy);
246 int (*get_phase)(struct clk_hw *hw);
247 int (*set_phase)(struct clk_hw *hw, int degrees);
248 int (*get_duty_cycle)(struct clk_hw *hw,
249 struct clk_duty *duty);
250 int (*set_duty_cycle)(struct clk_hw *hw,
251 struct clk_duty *duty);
252 int (*init)(struct clk_hw *hw);
253 void (*terminate)(struct clk_hw *hw);
254 void (*debug_init)(struct clk_hw *hw, struct dentry *dentry);
258 * struct clk_parent_data - clk parent information
259 * @hw: parent clk_hw pointer (used for clk providers with internal clks)
260 * @fw_name: parent name local to provider registering clk
261 * @name: globally unique parent name (used as a fallback)
262 * @index: parent index local to provider registering clk (if @fw_name absent)
264 struct clk_parent_data {
265 const struct clk_hw *hw;
272 * struct clk_init_data - holds init data that's common to all clocks and is
273 * shared between the clock provider and the common clock framework.
276 * @ops: operations this clock supports
277 * @parent_names: array of string names for all possible parents
278 * @parent_data: array of parent data for all possible parents (when some
279 * parents are external to the clk controller)
280 * @parent_hws: array of pointers to all possible parents (when all parents
281 * are internal to the clk controller)
282 * @num_parents: number of possible parents
283 * @flags: framework-level hints and quirks
285 struct clk_init_data {
287 const struct clk_ops *ops;
288 /* Only one of the following three should be assigned */
289 const char * const *parent_names;
290 const struct clk_parent_data *parent_data;
291 const struct clk_hw **parent_hws;
297 * struct clk_hw - handle for traversing from a struct clk to its corresponding
298 * hardware-specific structure. struct clk_hw should be declared within struct
299 * clk_foo and then referenced by the struct clk instance that uses struct
302 * @core: pointer to the struct clk_core instance that points back to this
303 * struct clk_hw instance
305 * @clk: pointer to the per-user struct clk instance that can be used to call
308 * @init: pointer to struct clk_init_data that contains the init data shared
309 * with the common clock framework. This pointer will be set to NULL once
310 * a clk_register() variant is called on this clk_hw pointer.
313 struct clk_core *core;
315 const struct clk_init_data *init;
319 * DOC: Basic clock implementations common to many platforms
321 * Each basic clock hardware type is comprised of a structure describing the
322 * clock hardware, implementations of the relevant callbacks in struct clk_ops,
323 * unique flags for that hardware type, a registration function and an
324 * alternative macro for static initialization
328 * struct clk_fixed_rate - fixed-rate clock
329 * @hw: handle between common and hardware-specific interfaces
330 * @fixed_rate: constant frequency of clock
331 * @fixed_accuracy: constant accuracy of clock in ppb (parts per billion)
332 * @flags: hardware specific flags
335 * * CLK_FIXED_RATE_PARENT_ACCURACY - Use the accuracy of the parent clk
336 * instead of what's set in @fixed_accuracy.
338 struct clk_fixed_rate {
340 unsigned long fixed_rate;
341 unsigned long fixed_accuracy;
345 #define CLK_FIXED_RATE_PARENT_ACCURACY BIT(0)
347 extern const struct clk_ops clk_fixed_rate_ops;
348 struct clk_hw *__clk_hw_register_fixed_rate(struct device *dev,
349 struct device_node *np, const char *name,
350 const char *parent_name, const struct clk_hw *parent_hw,
351 const struct clk_parent_data *parent_data, unsigned long flags,
352 unsigned long fixed_rate, unsigned long fixed_accuracy,
353 unsigned long clk_fixed_flags, bool devm);
354 struct clk *clk_register_fixed_rate(struct device *dev, const char *name,
355 const char *parent_name, unsigned long flags,
356 unsigned long fixed_rate);
358 * clk_hw_register_fixed_rate - register fixed-rate clock with the clock
360 * @dev: device that is registering this clock
361 * @name: name of this clock
362 * @parent_name: name of clock's parent
363 * @flags: framework-specific flags
364 * @fixed_rate: non-adjustable clock rate
366 #define clk_hw_register_fixed_rate(dev, name, parent_name, flags, fixed_rate) \
367 __clk_hw_register_fixed_rate((dev), NULL, (name), (parent_name), NULL, \
368 NULL, (flags), (fixed_rate), 0, 0, false)
371 * devm_clk_hw_register_fixed_rate - register fixed-rate clock with the clock
373 * @dev: device that is registering this clock
374 * @name: name of this clock
375 * @parent_name: name of clock's parent
376 * @flags: framework-specific flags
377 * @fixed_rate: non-adjustable clock rate
379 #define devm_clk_hw_register_fixed_rate(dev, name, parent_name, flags, fixed_rate) \
380 __clk_hw_register_fixed_rate((dev), NULL, (name), (parent_name), NULL, \
381 NULL, (flags), (fixed_rate), 0, 0, true)
383 * clk_hw_register_fixed_rate_parent_hw - register fixed-rate clock with
384 * the clock framework
385 * @dev: device that is registering this clock
386 * @name: name of this clock
387 * @parent_hw: pointer to parent clk
388 * @flags: framework-specific flags
389 * @fixed_rate: non-adjustable clock rate
391 #define clk_hw_register_fixed_rate_parent_hw(dev, name, parent_hw, flags, \
393 __clk_hw_register_fixed_rate((dev), NULL, (name), NULL, (parent_hw), \
394 NULL, (flags), (fixed_rate), 0, 0, false)
396 * clk_hw_register_fixed_rate_parent_data - register fixed-rate clock with
397 * the clock framework
398 * @dev: device that is registering this clock
399 * @name: name of this clock
400 * @parent_data: parent clk data
401 * @flags: framework-specific flags
402 * @fixed_rate: non-adjustable clock rate
404 #define clk_hw_register_fixed_rate_parent_data(dev, name, parent_hw, flags, \
406 __clk_hw_register_fixed_rate((dev), NULL, (name), NULL, NULL, \
407 (parent_data), (flags), (fixed_rate), 0, \
410 * clk_hw_register_fixed_rate_with_accuracy - register fixed-rate clock with
411 * the clock framework
412 * @dev: device that is registering this clock
413 * @name: name of this clock
414 * @parent_name: name of clock's parent
415 * @flags: framework-specific flags
416 * @fixed_rate: non-adjustable clock rate
417 * @fixed_accuracy: non-adjustable clock accuracy
419 #define clk_hw_register_fixed_rate_with_accuracy(dev, name, parent_name, \
422 __clk_hw_register_fixed_rate((dev), NULL, (name), (parent_name), \
423 NULL, NULL, (flags), (fixed_rate), \
424 (fixed_accuracy), 0, false)
426 * clk_hw_register_fixed_rate_with_accuracy_parent_hw - register fixed-rate
427 * clock with the clock framework
428 * @dev: device that is registering this clock
429 * @name: name of this clock
430 * @parent_hw: pointer to parent clk
431 * @flags: framework-specific flags
432 * @fixed_rate: non-adjustable clock rate
433 * @fixed_accuracy: non-adjustable clock accuracy
435 #define clk_hw_register_fixed_rate_with_accuracy_parent_hw(dev, name, \
436 parent_hw, flags, fixed_rate, fixed_accuracy) \
437 __clk_hw_register_fixed_rate((dev), NULL, (name), NULL, (parent_hw) \
438 NULL, NULL, (flags), (fixed_rate), \
439 (fixed_accuracy), 0, false)
441 * clk_hw_register_fixed_rate_with_accuracy_parent_data - register fixed-rate
442 * clock with the clock framework
443 * @dev: device that is registering this clock
444 * @name: name of this clock
445 * @parent_name: name of clock's parent
446 * @flags: framework-specific flags
447 * @fixed_rate: non-adjustable clock rate
448 * @fixed_accuracy: non-adjustable clock accuracy
450 #define clk_hw_register_fixed_rate_with_accuracy_parent_data(dev, name, \
451 parent_data, flags, fixed_rate, fixed_accuracy) \
452 __clk_hw_register_fixed_rate((dev), NULL, (name), NULL, NULL, \
453 (parent_data), NULL, (flags), \
454 (fixed_rate), (fixed_accuracy), 0, false)
456 * clk_hw_register_fixed_rate_parent_accuracy - register fixed-rate clock with
457 * the clock framework
458 * @dev: device that is registering this clock
459 * @name: name of this clock
460 * @parent_name: name of clock's parent
461 * @flags: framework-specific flags
462 * @fixed_rate: non-adjustable clock rate
464 #define clk_hw_register_fixed_rate_parent_accuracy(dev, name, parent_data, \
466 __clk_hw_register_fixed_rate((dev), NULL, (name), NULL, NULL, \
467 (parent_data), (flags), (fixed_rate), 0, \
468 CLK_FIXED_RATE_PARENT_ACCURACY, false)
470 void clk_unregister_fixed_rate(struct clk *clk);
471 void clk_hw_unregister_fixed_rate(struct clk_hw *hw);
473 void of_fixed_clk_setup(struct device_node *np);
476 * struct clk_gate - gating clock
478 * @hw: handle between common and hardware-specific interfaces
479 * @reg: register controlling gate
480 * @bit_idx: single bit controlling gate
481 * @flags: hardware-specific flags
482 * @lock: register lock
484 * Clock which can gate its output. Implements .enable & .disable
487 * CLK_GATE_SET_TO_DISABLE - by default this clock sets the bit at bit_idx to
488 * enable the clock. Setting this flag does the opposite: setting the bit
489 * disable the clock and clearing it enables the clock
490 * CLK_GATE_HIWORD_MASK - The gate settings are only in lower 16-bit
491 * of this register, and mask of gate bits are in higher 16-bit of this
492 * register. While setting the gate bits, higher 16-bit should also be
493 * updated to indicate changing gate bits.
494 * CLK_GATE_BIG_ENDIAN - by default little endian register accesses are used for
495 * the gate register. Setting this flag makes the register accesses big
506 #define to_clk_gate(_hw) container_of(_hw, struct clk_gate, hw)
508 #define CLK_GATE_SET_TO_DISABLE BIT(0)
509 #define CLK_GATE_HIWORD_MASK BIT(1)
510 #define CLK_GATE_BIG_ENDIAN BIT(2)
512 extern const struct clk_ops clk_gate_ops;
513 struct clk_hw *__clk_hw_register_gate(struct device *dev,
514 struct device_node *np, const char *name,
515 const char *parent_name, const struct clk_hw *parent_hw,
516 const struct clk_parent_data *parent_data,
518 void __iomem *reg, u8 bit_idx,
519 u8 clk_gate_flags, spinlock_t *lock);
520 struct clk_hw *__devm_clk_hw_register_gate(struct device *dev,
521 struct device_node *np, const char *name,
522 const char *parent_name, const struct clk_hw *parent_hw,
523 const struct clk_parent_data *parent_data,
525 void __iomem *reg, u8 bit_idx,
526 u8 clk_gate_flags, spinlock_t *lock);
527 struct clk *clk_register_gate(struct device *dev, const char *name,
528 const char *parent_name, unsigned long flags,
529 void __iomem *reg, u8 bit_idx,
530 u8 clk_gate_flags, spinlock_t *lock);
532 * clk_hw_register_gate - register a gate clock with the clock framework
533 * @dev: device that is registering this clock
534 * @name: name of this clock
535 * @parent_name: name of this clock's parent
536 * @flags: framework-specific flags for this clock
537 * @reg: register address to control gating of this clock
538 * @bit_idx: which bit in the register controls gating of this clock
539 * @clk_gate_flags: gate-specific flags for this clock
540 * @lock: shared register lock for this clock
542 #define clk_hw_register_gate(dev, name, parent_name, flags, reg, bit_idx, \
543 clk_gate_flags, lock) \
544 __clk_hw_register_gate((dev), NULL, (name), (parent_name), NULL, \
545 NULL, (flags), (reg), (bit_idx), \
546 (clk_gate_flags), (lock))
548 * clk_hw_register_gate_parent_hw - register a gate clock with the clock
550 * @dev: device that is registering this clock
551 * @name: name of this clock
552 * @parent_hw: pointer to parent clk
553 * @flags: framework-specific flags for this clock
554 * @reg: register address to control gating of this clock
555 * @bit_idx: which bit in the register controls gating of this clock
556 * @clk_gate_flags: gate-specific flags for this clock
557 * @lock: shared register lock for this clock
559 #define clk_hw_register_gate_parent_hw(dev, name, parent_hw, flags, reg, \
560 bit_idx, clk_gate_flags, lock) \
561 __clk_hw_register_gate((dev), NULL, (name), NULL, (parent_hw), \
562 NULL, (flags), (reg), (bit_idx), \
563 (clk_gate_flags), (lock))
565 * clk_hw_register_gate_parent_data - register a gate clock with the clock
567 * @dev: device that is registering this clock
568 * @name: name of this clock
569 * @parent_data: parent clk data
570 * @flags: framework-specific flags for this clock
571 * @reg: register address to control gating of this clock
572 * @bit_idx: which bit in the register controls gating of this clock
573 * @clk_gate_flags: gate-specific flags for this clock
574 * @lock: shared register lock for this clock
576 #define clk_hw_register_gate_parent_data(dev, name, parent_data, flags, reg, \
577 bit_idx, clk_gate_flags, lock) \
578 __clk_hw_register_gate((dev), NULL, (name), NULL, NULL, (parent_data), \
579 (flags), (reg), (bit_idx), \
580 (clk_gate_flags), (lock))
582 * devm_clk_hw_register_gate - register a gate clock with the clock framework
583 * @dev: device that is registering this clock
584 * @name: name of this clock
585 * @parent_name: name of this clock's parent
586 * @flags: framework-specific flags for this clock
587 * @reg: register address to control gating of this clock
588 * @bit_idx: which bit in the register controls gating of this clock
589 * @clk_gate_flags: gate-specific flags for this clock
590 * @lock: shared register lock for this clock
592 #define devm_clk_hw_register_gate(dev, name, parent_name, flags, reg, bit_idx,\
593 clk_gate_flags, lock) \
594 __devm_clk_hw_register_gate((dev), NULL, (name), (parent_name), NULL, \
595 NULL, (flags), (reg), (bit_idx), \
596 (clk_gate_flags), (lock))
597 void clk_unregister_gate(struct clk *clk);
598 void clk_hw_unregister_gate(struct clk_hw *hw);
599 int clk_gate_is_enabled(struct clk_hw *hw);
601 struct clk_div_table {
607 * struct clk_divider - adjustable divider clock
609 * @hw: handle between common and hardware-specific interfaces
610 * @reg: register containing the divider
611 * @shift: shift to the divider bit field
612 * @width: width of the divider bit field
613 * @table: array of value/divider pairs, last entry should have div = 0
614 * @lock: register lock
616 * Clock with an adjustable divider affecting its output frequency. Implements
617 * .recalc_rate, .set_rate and .round_rate
620 * CLK_DIVIDER_ONE_BASED - by default the divisor is the value read from the
621 * register plus one. If CLK_DIVIDER_ONE_BASED is set then the divider is
622 * the raw value read from the register, with the value of zero considered
623 * invalid, unless CLK_DIVIDER_ALLOW_ZERO is set.
624 * CLK_DIVIDER_POWER_OF_TWO - clock divisor is 2 raised to the value read from
625 * the hardware register
626 * CLK_DIVIDER_ALLOW_ZERO - Allow zero divisors. For dividers which have
627 * CLK_DIVIDER_ONE_BASED set, it is possible to end up with a zero divisor.
628 * Some hardware implementations gracefully handle this case and allow a
629 * zero divisor by not modifying their input clock
630 * (divide by one / bypass).
631 * CLK_DIVIDER_HIWORD_MASK - The divider settings are only in lower 16-bit
632 * of this register, and mask of divider bits are in higher 16-bit of this
633 * register. While setting the divider bits, higher 16-bit should also be
634 * updated to indicate changing divider bits.
635 * CLK_DIVIDER_ROUND_CLOSEST - Makes the best calculated divider to be rounded
636 * to the closest integer instead of the up one.
637 * CLK_DIVIDER_READ_ONLY - The divider settings are preconfigured and should
638 * not be changed by the clock framework.
639 * CLK_DIVIDER_MAX_AT_ZERO - For dividers which are like CLK_DIVIDER_ONE_BASED
640 * except when the value read from the register is zero, the divisor is
641 * 2^width of the field.
642 * CLK_DIVIDER_BIG_ENDIAN - By default little endian register accesses are used
643 * for the divider register. Setting this flag makes the register accesses
652 const struct clk_div_table *table;
656 #define clk_div_mask(width) ((1 << (width)) - 1)
657 #define to_clk_divider(_hw) container_of(_hw, struct clk_divider, hw)
659 #define CLK_DIVIDER_ONE_BASED BIT(0)
660 #define CLK_DIVIDER_POWER_OF_TWO BIT(1)
661 #define CLK_DIVIDER_ALLOW_ZERO BIT(2)
662 #define CLK_DIVIDER_HIWORD_MASK BIT(3)
663 #define CLK_DIVIDER_ROUND_CLOSEST BIT(4)
664 #define CLK_DIVIDER_READ_ONLY BIT(5)
665 #define CLK_DIVIDER_MAX_AT_ZERO BIT(6)
666 #define CLK_DIVIDER_BIG_ENDIAN BIT(7)
668 extern const struct clk_ops clk_divider_ops;
669 extern const struct clk_ops clk_divider_ro_ops;
671 unsigned long divider_recalc_rate(struct clk_hw *hw, unsigned long parent_rate,
672 unsigned int val, const struct clk_div_table *table,
673 unsigned long flags, unsigned long width);
674 long divider_round_rate_parent(struct clk_hw *hw, struct clk_hw *parent,
675 unsigned long rate, unsigned long *prate,
676 const struct clk_div_table *table,
677 u8 width, unsigned long flags);
678 long divider_ro_round_rate_parent(struct clk_hw *hw, struct clk_hw *parent,
679 unsigned long rate, unsigned long *prate,
680 const struct clk_div_table *table, u8 width,
681 unsigned long flags, unsigned int val);
682 int divider_determine_rate(struct clk_hw *hw, struct clk_rate_request *req,
683 const struct clk_div_table *table, u8 width,
684 unsigned long flags);
685 int divider_ro_determine_rate(struct clk_hw *hw, struct clk_rate_request *req,
686 const struct clk_div_table *table, u8 width,
687 unsigned long flags, unsigned int val);
688 int divider_get_val(unsigned long rate, unsigned long parent_rate,
689 const struct clk_div_table *table, u8 width,
690 unsigned long flags);
692 struct clk_hw *__clk_hw_register_divider(struct device *dev,
693 struct device_node *np, const char *name,
694 const char *parent_name, const struct clk_hw *parent_hw,
695 const struct clk_parent_data *parent_data, unsigned long flags,
696 void __iomem *reg, u8 shift, u8 width, u8 clk_divider_flags,
697 const struct clk_div_table *table, spinlock_t *lock);
698 struct clk_hw *__devm_clk_hw_register_divider(struct device *dev,
699 struct device_node *np, const char *name,
700 const char *parent_name, const struct clk_hw *parent_hw,
701 const struct clk_parent_data *parent_data, unsigned long flags,
702 void __iomem *reg, u8 shift, u8 width, u8 clk_divider_flags,
703 const struct clk_div_table *table, spinlock_t *lock);
704 struct clk *clk_register_divider_table(struct device *dev, const char *name,
705 const char *parent_name, unsigned long flags,
706 void __iomem *reg, u8 shift, u8 width,
707 u8 clk_divider_flags, const struct clk_div_table *table,
710 * clk_register_divider - register a divider clock with the clock framework
711 * @dev: device registering this clock
712 * @name: name of this clock
713 * @parent_name: name of clock's parent
714 * @flags: framework-specific flags
715 * @reg: register address to adjust divider
716 * @shift: number of bits to shift the bitfield
717 * @width: width of the bitfield
718 * @clk_divider_flags: divider-specific flags for this clock
719 * @lock: shared register lock for this clock
721 #define clk_register_divider(dev, name, parent_name, flags, reg, shift, width, \
722 clk_divider_flags, lock) \
723 clk_register_divider_table((dev), (name), (parent_name), (flags), \
724 (reg), (shift), (width), \
725 (clk_divider_flags), NULL, (lock))
727 * clk_hw_register_divider - register a divider clock with the clock framework
728 * @dev: device registering this clock
729 * @name: name of this clock
730 * @parent_name: name of clock's parent
731 * @flags: framework-specific flags
732 * @reg: register address to adjust divider
733 * @shift: number of bits to shift the bitfield
734 * @width: width of the bitfield
735 * @clk_divider_flags: divider-specific flags for this clock
736 * @lock: shared register lock for this clock
738 #define clk_hw_register_divider(dev, name, parent_name, flags, reg, shift, \
739 width, clk_divider_flags, lock) \
740 __clk_hw_register_divider((dev), NULL, (name), (parent_name), NULL, \
741 NULL, (flags), (reg), (shift), (width), \
742 (clk_divider_flags), NULL, (lock))
744 * clk_hw_register_divider_parent_hw - register a divider clock with the clock
746 * @dev: device registering this clock
747 * @name: name of this clock
748 * @parent_hw: pointer to parent clk
749 * @flags: framework-specific flags
750 * @reg: register address to adjust divider
751 * @shift: number of bits to shift the bitfield
752 * @width: width of the bitfield
753 * @clk_divider_flags: divider-specific flags for this clock
754 * @lock: shared register lock for this clock
756 #define clk_hw_register_divider_parent_hw(dev, name, parent_hw, flags, reg, \
757 shift, width, clk_divider_flags, \
759 __clk_hw_register_divider((dev), NULL, (name), NULL, (parent_hw), \
760 NULL, (flags), (reg), (shift), (width), \
761 (clk_divider_flags), NULL, (lock))
763 * clk_hw_register_divider_parent_data - register a divider clock with the clock
765 * @dev: device registering this clock
766 * @name: name of this clock
767 * @parent_data: parent clk data
768 * @flags: framework-specific flags
769 * @reg: register address to adjust divider
770 * @shift: number of bits to shift the bitfield
771 * @width: width of the bitfield
772 * @clk_divider_flags: divider-specific flags for this clock
773 * @lock: shared register lock for this clock
775 #define clk_hw_register_divider_parent_data(dev, name, parent_data, flags, \
777 clk_divider_flags, lock) \
778 __clk_hw_register_divider((dev), NULL, (name), NULL, NULL, \
779 (parent_data), (flags), (reg), (shift), \
780 (width), (clk_divider_flags), NULL, (lock))
782 * clk_hw_register_divider_table - register a table based divider clock with
783 * the clock framework
784 * @dev: device registering this clock
785 * @name: name of this clock
786 * @parent_name: name of clock's parent
787 * @flags: framework-specific flags
788 * @reg: register address to adjust divider
789 * @shift: number of bits to shift the bitfield
790 * @width: width of the bitfield
791 * @clk_divider_flags: divider-specific flags for this clock
792 * @table: array of divider/value pairs ending with a div set to 0
793 * @lock: shared register lock for this clock
795 #define clk_hw_register_divider_table(dev, name, parent_name, flags, reg, \
796 shift, width, clk_divider_flags, table, \
798 __clk_hw_register_divider((dev), NULL, (name), (parent_name), NULL, \
799 NULL, (flags), (reg), (shift), (width), \
800 (clk_divider_flags), (table), (lock))
802 * clk_hw_register_divider_table_parent_hw - register a table based divider
803 * clock with the clock framework
804 * @dev: device registering this clock
805 * @name: name of this clock
806 * @parent_hw: pointer to parent clk
807 * @flags: framework-specific flags
808 * @reg: register address to adjust divider
809 * @shift: number of bits to shift the bitfield
810 * @width: width of the bitfield
811 * @clk_divider_flags: divider-specific flags for this clock
812 * @table: array of divider/value pairs ending with a div set to 0
813 * @lock: shared register lock for this clock
815 #define clk_hw_register_divider_table_parent_hw(dev, name, parent_hw, flags, \
817 clk_divider_flags, table, \
819 __clk_hw_register_divider((dev), NULL, (name), NULL, (parent_hw), \
820 NULL, (flags), (reg), (shift), (width), \
821 (clk_divider_flags), (table), (lock))
823 * clk_hw_register_divider_table_parent_data - register a table based divider
824 * clock with the clock framework
825 * @dev: device registering this clock
826 * @name: name of this clock
827 * @parent_data: parent clk data
828 * @flags: framework-specific flags
829 * @reg: register address to adjust divider
830 * @shift: number of bits to shift the bitfield
831 * @width: width of the bitfield
832 * @clk_divider_flags: divider-specific flags for this clock
833 * @table: array of divider/value pairs ending with a div set to 0
834 * @lock: shared register lock for this clock
836 #define clk_hw_register_divider_table_parent_data(dev, name, parent_data, \
837 flags, reg, shift, width, \
838 clk_divider_flags, table, \
840 __clk_hw_register_divider((dev), NULL, (name), NULL, NULL, \
841 (parent_data), (flags), (reg), (shift), \
842 (width), (clk_divider_flags), (table), \
845 * devm_clk_hw_register_divider - register a divider clock with the clock framework
846 * @dev: device registering this clock
847 * @name: name of this clock
848 * @parent_name: name of clock's parent
849 * @flags: framework-specific flags
850 * @reg: register address to adjust divider
851 * @shift: number of bits to shift the bitfield
852 * @width: width of the bitfield
853 * @clk_divider_flags: divider-specific flags for this clock
854 * @lock: shared register lock for this clock
856 #define devm_clk_hw_register_divider(dev, name, parent_name, flags, reg, shift, \
857 width, clk_divider_flags, lock) \
858 __devm_clk_hw_register_divider((dev), NULL, (name), (parent_name), NULL, \
859 NULL, (flags), (reg), (shift), (width), \
860 (clk_divider_flags), NULL, (lock))
862 * devm_clk_hw_register_divider_parent_hw - register a divider clock with the clock framework
863 * @dev: device registering this clock
864 * @name: name of this clock
865 * @parent_hw: pointer to parent clk
866 * @flags: framework-specific flags
867 * @reg: register address to adjust divider
868 * @shift: number of bits to shift the bitfield
869 * @width: width of the bitfield
870 * @clk_divider_flags: divider-specific flags for this clock
871 * @lock: shared register lock for this clock
873 #define devm_clk_hw_register_divider_parent_hw(dev, name, parent_hw, flags, \
875 clk_divider_flags, lock) \
876 __devm_clk_hw_register_divider((dev), NULL, (name), NULL, \
877 (parent_hw), NULL, (flags), (reg), \
878 (shift), (width), (clk_divider_flags), \
881 * devm_clk_hw_register_divider_table - register a table based divider clock
882 * with the clock framework (devres variant)
883 * @dev: device registering this clock
884 * @name: name of this clock
885 * @parent_name: name of clock's parent
886 * @flags: framework-specific flags
887 * @reg: register address to adjust divider
888 * @shift: number of bits to shift the bitfield
889 * @width: width of the bitfield
890 * @clk_divider_flags: divider-specific flags for this clock
891 * @table: array of divider/value pairs ending with a div set to 0
892 * @lock: shared register lock for this clock
894 #define devm_clk_hw_register_divider_table(dev, name, parent_name, flags, \
896 clk_divider_flags, table, lock) \
897 __devm_clk_hw_register_divider((dev), NULL, (name), (parent_name), \
898 NULL, NULL, (flags), (reg), (shift), \
899 (width), (clk_divider_flags), (table), \
902 void clk_unregister_divider(struct clk *clk);
903 void clk_hw_unregister_divider(struct clk_hw *hw);
906 * struct clk_mux - multiplexer clock
908 * @hw: handle between common and hardware-specific interfaces
909 * @reg: register controlling multiplexer
910 * @table: array of register values corresponding to the parent index
911 * @shift: shift to multiplexer bit field
912 * @mask: mask of mutliplexer bit field
913 * @flags: hardware-specific flags
914 * @lock: register lock
916 * Clock with multiple selectable parents. Implements .get_parent, .set_parent
920 * CLK_MUX_INDEX_ONE - register index starts at 1, not 0
921 * CLK_MUX_INDEX_BIT - register index is a single bit (power of two)
922 * CLK_MUX_HIWORD_MASK - The mux settings are only in lower 16-bit of this
923 * register, and mask of mux bits are in higher 16-bit of this register.
924 * While setting the mux bits, higher 16-bit should also be updated to
925 * indicate changing mux bits.
926 * CLK_MUX_READ_ONLY - The mux registers can't be written, only read in the
927 * .get_parent clk_op.
928 * CLK_MUX_ROUND_CLOSEST - Use the parent rate that is closest to the desired
930 * CLK_MUX_BIG_ENDIAN - By default little endian register accesses are used for
931 * the mux register. Setting this flag makes the register accesses big
944 #define to_clk_mux(_hw) container_of(_hw, struct clk_mux, hw)
946 #define CLK_MUX_INDEX_ONE BIT(0)
947 #define CLK_MUX_INDEX_BIT BIT(1)
948 #define CLK_MUX_HIWORD_MASK BIT(2)
949 #define CLK_MUX_READ_ONLY BIT(3) /* mux can't be changed */
950 #define CLK_MUX_ROUND_CLOSEST BIT(4)
951 #define CLK_MUX_BIG_ENDIAN BIT(5)
953 extern const struct clk_ops clk_mux_ops;
954 extern const struct clk_ops clk_mux_ro_ops;
956 struct clk_hw *__clk_hw_register_mux(struct device *dev, struct device_node *np,
957 const char *name, u8 num_parents,
958 const char * const *parent_names,
959 const struct clk_hw **parent_hws,
960 const struct clk_parent_data *parent_data,
961 unsigned long flags, void __iomem *reg, u8 shift, u32 mask,
962 u8 clk_mux_flags, const u32 *table, spinlock_t *lock);
963 struct clk_hw *__devm_clk_hw_register_mux(struct device *dev, struct device_node *np,
964 const char *name, u8 num_parents,
965 const char * const *parent_names,
966 const struct clk_hw **parent_hws,
967 const struct clk_parent_data *parent_data,
968 unsigned long flags, void __iomem *reg, u8 shift, u32 mask,
969 u8 clk_mux_flags, const u32 *table, spinlock_t *lock);
970 struct clk *clk_register_mux_table(struct device *dev, const char *name,
971 const char * const *parent_names, u8 num_parents,
972 unsigned long flags, void __iomem *reg, u8 shift, u32 mask,
973 u8 clk_mux_flags, const u32 *table, spinlock_t *lock);
975 #define clk_register_mux(dev, name, parent_names, num_parents, flags, reg, \
976 shift, width, clk_mux_flags, lock) \
977 clk_register_mux_table((dev), (name), (parent_names), (num_parents), \
978 (flags), (reg), (shift), BIT((width)) - 1, \
979 (clk_mux_flags), NULL, (lock))
980 #define clk_hw_register_mux_table(dev, name, parent_names, num_parents, \
981 flags, reg, shift, mask, clk_mux_flags, \
983 __clk_hw_register_mux((dev), NULL, (name), (num_parents), \
984 (parent_names), NULL, NULL, (flags), (reg), \
985 (shift), (mask), (clk_mux_flags), (table), \
987 #define clk_hw_register_mux_table_parent_data(dev, name, parent_data, \
988 num_parents, flags, reg, shift, mask, \
989 clk_mux_flags, table, lock) \
990 __clk_hw_register_mux((dev), NULL, (name), (num_parents), \
991 NULL, NULL, (parent_data), (flags), (reg), \
992 (shift), (mask), (clk_mux_flags), (table), \
994 #define clk_hw_register_mux(dev, name, parent_names, num_parents, flags, reg, \
995 shift, width, clk_mux_flags, lock) \
996 __clk_hw_register_mux((dev), NULL, (name), (num_parents), \
997 (parent_names), NULL, NULL, (flags), (reg), \
998 (shift), BIT((width)) - 1, (clk_mux_flags), \
1000 #define clk_hw_register_mux_hws(dev, name, parent_hws, num_parents, flags, \
1001 reg, shift, width, clk_mux_flags, lock) \
1002 __clk_hw_register_mux((dev), NULL, (name), (num_parents), NULL, \
1003 (parent_hws), NULL, (flags), (reg), (shift), \
1004 BIT((width)) - 1, (clk_mux_flags), NULL, (lock))
1005 #define clk_hw_register_mux_parent_data(dev, name, parent_data, num_parents, \
1006 flags, reg, shift, width, \
1007 clk_mux_flags, lock) \
1008 __clk_hw_register_mux((dev), NULL, (name), (num_parents), NULL, NULL, \
1009 (parent_data), (flags), (reg), (shift), \
1010 BIT((width)) - 1, (clk_mux_flags), NULL, (lock))
1011 #define clk_hw_register_mux_parent_data_table(dev, name, parent_data, \
1012 num_parents, flags, reg, shift, \
1013 width, clk_mux_flags, table, \
1015 __clk_hw_register_mux((dev), NULL, (name), (num_parents), NULL, NULL, \
1016 (parent_data), (flags), (reg), (shift), \
1017 BIT((width)) - 1, (clk_mux_flags), table, (lock))
1018 #define devm_clk_hw_register_mux(dev, name, parent_names, num_parents, flags, reg, \
1019 shift, width, clk_mux_flags, lock) \
1020 __devm_clk_hw_register_mux((dev), NULL, (name), (num_parents), \
1021 (parent_names), NULL, NULL, (flags), (reg), \
1022 (shift), BIT((width)) - 1, (clk_mux_flags), \
1024 #define devm_clk_hw_register_mux_parent_hws(dev, name, parent_hws, \
1025 num_parents, flags, reg, shift, \
1026 width, clk_mux_flags, lock) \
1027 __devm_clk_hw_register_mux((dev), NULL, (name), (num_parents), NULL, \
1028 (parent_hws), NULL, (flags), (reg), \
1029 (shift), BIT((width)) - 1, \
1030 (clk_mux_flags), NULL, (lock))
1031 #define devm_clk_hw_register_mux_parent_data_table(dev, name, parent_data, \
1032 num_parents, flags, reg, shift, \
1033 width, clk_mux_flags, table, \
1035 __devm_clk_hw_register_mux((dev), NULL, (name), (num_parents), NULL, \
1036 NULL, (parent_data), (flags), (reg), (shift), \
1037 BIT((width)) - 1, (clk_mux_flags), table, (lock))
1039 int clk_mux_val_to_index(struct clk_hw *hw, const u32 *table, unsigned int flags,
1041 unsigned int clk_mux_index_to_val(const u32 *table, unsigned int flags, u8 index);
1043 void clk_unregister_mux(struct clk *clk);
1044 void clk_hw_unregister_mux(struct clk_hw *hw);
1046 void of_fixed_factor_clk_setup(struct device_node *node);
1049 * struct clk_fixed_factor - fixed multiplier and divider clock
1051 * @hw: handle between common and hardware-specific interfaces
1055 * Clock with a fixed multiplier and divider. The output frequency is the
1056 * parent clock rate divided by div and multiplied by mult.
1057 * Implements .recalc_rate, .set_rate and .round_rate
1060 struct clk_fixed_factor {
1066 #define to_clk_fixed_factor(_hw) container_of(_hw, struct clk_fixed_factor, hw)
1068 extern const struct clk_ops clk_fixed_factor_ops;
1069 struct clk *clk_register_fixed_factor(struct device *dev, const char *name,
1070 const char *parent_name, unsigned long flags,
1071 unsigned int mult, unsigned int div);
1072 void clk_unregister_fixed_factor(struct clk *clk);
1073 struct clk_hw *clk_hw_register_fixed_factor(struct device *dev,
1074 const char *name, const char *parent_name, unsigned long flags,
1075 unsigned int mult, unsigned int div);
1076 void clk_hw_unregister_fixed_factor(struct clk_hw *hw);
1077 struct clk_hw *devm_clk_hw_register_fixed_factor(struct device *dev,
1078 const char *name, const char *parent_name, unsigned long flags,
1079 unsigned int mult, unsigned int div);
1080 struct clk_hw *devm_clk_hw_register_fixed_factor_index(struct device *dev,
1081 const char *name, unsigned int index, unsigned long flags,
1082 unsigned int mult, unsigned int div);
1084 struct clk_hw *devm_clk_hw_register_fixed_factor_parent_hw(struct device *dev,
1085 const char *name, const struct clk_hw *parent_hw,
1086 unsigned long flags, unsigned int mult, unsigned int div);
1088 struct clk_hw *clk_hw_register_fixed_factor_parent_hw(struct device *dev,
1089 const char *name, const struct clk_hw *parent_hw,
1090 unsigned long flags, unsigned int mult, unsigned int div);
1092 * struct clk_fractional_divider - adjustable fractional divider clock
1094 * @hw: handle between common and hardware-specific interfaces
1095 * @reg: register containing the divider
1096 * @mshift: shift to the numerator bit field
1097 * @mwidth: width of the numerator bit field
1098 * @nshift: shift to the denominator bit field
1099 * @nwidth: width of the denominator bit field
1100 * @lock: register lock
1102 * Clock with adjustable fractional divider affecting its output frequency.
1105 * CLK_FRAC_DIVIDER_ZERO_BASED - by default the numerator and denominator
1106 * is the value read from the register. If CLK_FRAC_DIVIDER_ZERO_BASED
1107 * is set then the numerator and denominator are both the value read
1109 * CLK_FRAC_DIVIDER_BIG_ENDIAN - By default little endian register accesses are
1110 * used for the divider register. Setting this flag makes the register
1111 * accesses big endian.
1112 * CLK_FRAC_DIVIDER_POWER_OF_TWO_PS - By default the resulting fraction might
1113 * be saturated and the caller will get quite far from the good enough
1114 * approximation. Instead the caller may require, by setting this flag,
1115 * to shift left by a few bits in case, when the asked one is quite small
1116 * to satisfy the desired range of denominator. It assumes that on the
1117 * caller's side the power-of-two capable prescaler exists.
1119 struct clk_fractional_divider {
1129 void (*approximation)(struct clk_hw *hw,
1130 unsigned long rate, unsigned long *parent_rate,
1131 unsigned long *m, unsigned long *n);
1135 #define to_clk_fd(_hw) container_of(_hw, struct clk_fractional_divider, hw)
1137 #define CLK_FRAC_DIVIDER_ZERO_BASED BIT(0)
1138 #define CLK_FRAC_DIVIDER_BIG_ENDIAN BIT(1)
1139 #define CLK_FRAC_DIVIDER_POWER_OF_TWO_PS BIT(2)
1141 struct clk *clk_register_fractional_divider(struct device *dev,
1142 const char *name, const char *parent_name, unsigned long flags,
1143 void __iomem *reg, u8 mshift, u8 mwidth, u8 nshift, u8 nwidth,
1144 u8 clk_divider_flags, spinlock_t *lock);
1145 struct clk_hw *clk_hw_register_fractional_divider(struct device *dev,
1146 const char *name, const char *parent_name, unsigned long flags,
1147 void __iomem *reg, u8 mshift, u8 mwidth, u8 nshift, u8 nwidth,
1148 u8 clk_divider_flags, spinlock_t *lock);
1149 void clk_hw_unregister_fractional_divider(struct clk_hw *hw);
1152 * struct clk_multiplier - adjustable multiplier clock
1154 * @hw: handle between common and hardware-specific interfaces
1155 * @reg: register containing the multiplier
1156 * @shift: shift to the multiplier bit field
1157 * @width: width of the multiplier bit field
1158 * @lock: register lock
1160 * Clock with an adjustable multiplier affecting its output frequency.
1161 * Implements .recalc_rate, .set_rate and .round_rate
1164 * CLK_MULTIPLIER_ZERO_BYPASS - By default, the multiplier is the value read
1165 * from the register, with 0 being a valid value effectively
1166 * zeroing the output clock rate. If CLK_MULTIPLIER_ZERO_BYPASS is
1167 * set, then a null multiplier will be considered as a bypass,
1168 * leaving the parent rate unmodified.
1169 * CLK_MULTIPLIER_ROUND_CLOSEST - Makes the best calculated divider to be
1170 * rounded to the closest integer instead of the down one.
1171 * CLK_MULTIPLIER_BIG_ENDIAN - By default little endian register accesses are
1172 * used for the multiplier register. Setting this flag makes the register
1173 * accesses big endian.
1175 struct clk_multiplier {
1184 #define to_clk_multiplier(_hw) container_of(_hw, struct clk_multiplier, hw)
1186 #define CLK_MULTIPLIER_ZERO_BYPASS BIT(0)
1187 #define CLK_MULTIPLIER_ROUND_CLOSEST BIT(1)
1188 #define CLK_MULTIPLIER_BIG_ENDIAN BIT(2)
1190 extern const struct clk_ops clk_multiplier_ops;
1193 * struct clk_composite - aggregate clock of mux, divider and gate clocks
1195 * @hw: handle between common and hardware-specific interfaces
1196 * @mux_hw: handle between composite and hardware-specific mux clock
1197 * @rate_hw: handle between composite and hardware-specific rate clock
1198 * @gate_hw: handle between composite and hardware-specific gate clock
1199 * @mux_ops: clock ops for mux
1200 * @rate_ops: clock ops for rate
1201 * @gate_ops: clock ops for gate
1203 struct clk_composite {
1207 struct clk_hw *mux_hw;
1208 struct clk_hw *rate_hw;
1209 struct clk_hw *gate_hw;
1211 const struct clk_ops *mux_ops;
1212 const struct clk_ops *rate_ops;
1213 const struct clk_ops *gate_ops;
1216 #define to_clk_composite(_hw) container_of(_hw, struct clk_composite, hw)
1218 struct clk *clk_register_composite(struct device *dev, const char *name,
1219 const char * const *parent_names, int num_parents,
1220 struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
1221 struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
1222 struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
1223 unsigned long flags);
1224 struct clk *clk_register_composite_pdata(struct device *dev, const char *name,
1225 const struct clk_parent_data *parent_data, int num_parents,
1226 struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
1227 struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
1228 struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
1229 unsigned long flags);
1230 void clk_unregister_composite(struct clk *clk);
1231 struct clk_hw *clk_hw_register_composite(struct device *dev, const char *name,
1232 const char * const *parent_names, int num_parents,
1233 struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
1234 struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
1235 struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
1236 unsigned long flags);
1237 struct clk_hw *clk_hw_register_composite_pdata(struct device *dev,
1239 const struct clk_parent_data *parent_data, int num_parents,
1240 struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
1241 struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
1242 struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
1243 unsigned long flags);
1244 struct clk_hw *devm_clk_hw_register_composite_pdata(struct device *dev,
1245 const char *name, const struct clk_parent_data *parent_data,
1247 struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
1248 struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
1249 struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
1250 unsigned long flags);
1251 void clk_hw_unregister_composite(struct clk_hw *hw);
1253 struct clk *clk_register(struct device *dev, struct clk_hw *hw);
1254 struct clk *devm_clk_register(struct device *dev, struct clk_hw *hw);
1256 int __must_check clk_hw_register(struct device *dev, struct clk_hw *hw);
1257 int __must_check devm_clk_hw_register(struct device *dev, struct clk_hw *hw);
1258 int __must_check of_clk_hw_register(struct device_node *node, struct clk_hw *hw);
1260 void clk_unregister(struct clk *clk);
1262 void clk_hw_unregister(struct clk_hw *hw);
1264 /* helper functions */
1265 const char *__clk_get_name(const struct clk *clk);
1266 const char *clk_hw_get_name(const struct clk_hw *hw);
1267 #ifdef CONFIG_COMMON_CLK
1268 struct clk_hw *__clk_get_hw(struct clk *clk);
1270 static inline struct clk_hw *__clk_get_hw(struct clk *clk)
1272 return (struct clk_hw *)clk;
1276 struct clk *clk_hw_get_clk(struct clk_hw *hw, const char *con_id);
1277 struct clk *devm_clk_hw_get_clk(struct device *dev, struct clk_hw *hw,
1278 const char *con_id);
1280 unsigned int clk_hw_get_num_parents(const struct clk_hw *hw);
1281 struct clk_hw *clk_hw_get_parent(const struct clk_hw *hw);
1282 struct clk_hw *clk_hw_get_parent_by_index(const struct clk_hw *hw,
1283 unsigned int index);
1284 int clk_hw_get_parent_index(struct clk_hw *hw);
1285 int clk_hw_set_parent(struct clk_hw *hw, struct clk_hw *new_parent);
1286 unsigned int __clk_get_enable_count(struct clk *clk);
1287 unsigned long clk_hw_get_rate(const struct clk_hw *hw);
1288 unsigned long clk_hw_get_flags(const struct clk_hw *hw);
1289 #define clk_hw_can_set_rate_parent(hw) \
1290 (clk_hw_get_flags((hw)) & CLK_SET_RATE_PARENT)
1292 bool clk_hw_is_prepared(const struct clk_hw *hw);
1293 bool clk_hw_rate_is_protected(const struct clk_hw *hw);
1294 bool clk_hw_is_enabled(const struct clk_hw *hw);
1295 bool __clk_is_enabled(struct clk *clk);
1296 struct clk *__clk_lookup(const char *name);
1297 int __clk_mux_determine_rate(struct clk_hw *hw,
1298 struct clk_rate_request *req);
1299 int __clk_determine_rate(struct clk_hw *core, struct clk_rate_request *req);
1300 int __clk_mux_determine_rate_closest(struct clk_hw *hw,
1301 struct clk_rate_request *req);
1302 int clk_mux_determine_rate_flags(struct clk_hw *hw,
1303 struct clk_rate_request *req,
1304 unsigned long flags);
1305 void clk_hw_reparent(struct clk_hw *hw, struct clk_hw *new_parent);
1306 void clk_hw_set_rate_range(struct clk_hw *hw, unsigned long min_rate,
1307 unsigned long max_rate);
1309 static inline void __clk_hw_set_clk(struct clk_hw *dst, struct clk_hw *src)
1311 dst->clk = src->clk;
1312 dst->core = src->core;
1315 static inline long divider_round_rate(struct clk_hw *hw, unsigned long rate,
1316 unsigned long *prate,
1317 const struct clk_div_table *table,
1318 u8 width, unsigned long flags)
1320 return divider_round_rate_parent(hw, clk_hw_get_parent(hw),
1321 rate, prate, table, width, flags);
1324 static inline long divider_ro_round_rate(struct clk_hw *hw, unsigned long rate,
1325 unsigned long *prate,
1326 const struct clk_div_table *table,
1327 u8 width, unsigned long flags,
1330 return divider_ro_round_rate_parent(hw, clk_hw_get_parent(hw),
1331 rate, prate, table, width, flags,
1336 * FIXME clock api without lock protection
1338 unsigned long clk_hw_round_rate(struct clk_hw *hw, unsigned long rate);
1340 struct clk_onecell_data {
1342 unsigned int clk_num;
1345 struct clk_hw_onecell_data {
1347 struct clk_hw *hws[];
1350 #define CLK_OF_DECLARE(name, compat, fn) OF_DECLARE_1(clk, name, compat, fn)
1353 * Use this macro when you have a driver that requires two initialization
1354 * routines, one at of_clk_init(), and one at platform device probe
1356 #define CLK_OF_DECLARE_DRIVER(name, compat, fn) \
1357 static void __init name##_of_clk_init_driver(struct device_node *np) \
1359 of_node_clear_flag(np, OF_POPULATED); \
1362 OF_DECLARE_1(clk, name, compat, name##_of_clk_init_driver)
1364 #define CLK_HW_INIT(_name, _parent, _ops, _flags) \
1365 (&(struct clk_init_data) { \
1368 .parent_names = (const char *[]) { _parent }, \
1373 #define CLK_HW_INIT_HW(_name, _parent, _ops, _flags) \
1374 (&(struct clk_init_data) { \
1377 .parent_hws = (const struct clk_hw*[]) { _parent }, \
1383 * This macro is intended for drivers to be able to share the otherwise
1384 * individual struct clk_hw[] compound literals created by the compiler
1385 * when using CLK_HW_INIT_HW. It does NOT support multiple parents.
1387 #define CLK_HW_INIT_HWS(_name, _parent, _ops, _flags) \
1388 (&(struct clk_init_data) { \
1391 .parent_hws = _parent, \
1396 #define CLK_HW_INIT_FW_NAME(_name, _parent, _ops, _flags) \
1397 (&(struct clk_init_data) { \
1400 .parent_data = (const struct clk_parent_data[]) { \
1401 { .fw_name = _parent }, \
1407 #define CLK_HW_INIT_PARENTS(_name, _parents, _ops, _flags) \
1408 (&(struct clk_init_data) { \
1411 .parent_names = _parents, \
1412 .num_parents = ARRAY_SIZE(_parents), \
1416 #define CLK_HW_INIT_PARENTS_HW(_name, _parents, _ops, _flags) \
1417 (&(struct clk_init_data) { \
1420 .parent_hws = _parents, \
1421 .num_parents = ARRAY_SIZE(_parents), \
1425 #define CLK_HW_INIT_PARENTS_DATA(_name, _parents, _ops, _flags) \
1426 (&(struct clk_init_data) { \
1429 .parent_data = _parents, \
1430 .num_parents = ARRAY_SIZE(_parents), \
1434 #define CLK_HW_INIT_NO_PARENT(_name, _ops, _flags) \
1435 (&(struct clk_init_data) { \
1438 .parent_names = NULL, \
1443 #define CLK_FIXED_FACTOR(_struct, _name, _parent, \
1444 _div, _mult, _flags) \
1445 struct clk_fixed_factor _struct = { \
1448 .hw.init = CLK_HW_INIT(_name, \
1450 &clk_fixed_factor_ops, \
1454 #define CLK_FIXED_FACTOR_HW(_struct, _name, _parent, \
1455 _div, _mult, _flags) \
1456 struct clk_fixed_factor _struct = { \
1459 .hw.init = CLK_HW_INIT_HW(_name, \
1461 &clk_fixed_factor_ops, \
1466 * This macro allows the driver to reuse the _parent array for multiple
1467 * fixed factor clk declarations.
1469 #define CLK_FIXED_FACTOR_HWS(_struct, _name, _parent, \
1470 _div, _mult, _flags) \
1471 struct clk_fixed_factor _struct = { \
1474 .hw.init = CLK_HW_INIT_HWS(_name, \
1476 &clk_fixed_factor_ops, \
1480 #define CLK_FIXED_FACTOR_FW_NAME(_struct, _name, _parent, \
1481 _div, _mult, _flags) \
1482 struct clk_fixed_factor _struct = { \
1485 .hw.init = CLK_HW_INIT_FW_NAME(_name, \
1487 &clk_fixed_factor_ops, \
1492 int of_clk_add_provider(struct device_node *np,
1493 struct clk *(*clk_src_get)(struct of_phandle_args *args,
1496 int of_clk_add_hw_provider(struct device_node *np,
1497 struct clk_hw *(*get)(struct of_phandle_args *clkspec,
1500 int devm_of_clk_add_hw_provider(struct device *dev,
1501 struct clk_hw *(*get)(struct of_phandle_args *clkspec,
1504 void of_clk_del_provider(struct device_node *np);
1506 struct clk *of_clk_src_simple_get(struct of_phandle_args *clkspec,
1508 struct clk_hw *of_clk_hw_simple_get(struct of_phandle_args *clkspec,
1510 struct clk *of_clk_src_onecell_get(struct of_phandle_args *clkspec, void *data);
1511 struct clk_hw *of_clk_hw_onecell_get(struct of_phandle_args *clkspec,
1513 int of_clk_parent_fill(struct device_node *np, const char **parents,
1515 int of_clk_detect_critical(struct device_node *np, int index,
1516 unsigned long *flags);
1518 #else /* !CONFIG_OF */
1520 static inline int of_clk_add_provider(struct device_node *np,
1521 struct clk *(*clk_src_get)(struct of_phandle_args *args,
1527 static inline int of_clk_add_hw_provider(struct device_node *np,
1528 struct clk_hw *(*get)(struct of_phandle_args *clkspec,
1534 static inline int devm_of_clk_add_hw_provider(struct device *dev,
1535 struct clk_hw *(*get)(struct of_phandle_args *clkspec,
1541 static inline void of_clk_del_provider(struct device_node *np) {}
1543 static inline struct clk *of_clk_src_simple_get(
1544 struct of_phandle_args *clkspec, void *data)
1546 return ERR_PTR(-ENOENT);
1548 static inline struct clk_hw *
1549 of_clk_hw_simple_get(struct of_phandle_args *clkspec, void *data)
1551 return ERR_PTR(-ENOENT);
1553 static inline struct clk *of_clk_src_onecell_get(
1554 struct of_phandle_args *clkspec, void *data)
1556 return ERR_PTR(-ENOENT);
1558 static inline struct clk_hw *
1559 of_clk_hw_onecell_get(struct of_phandle_args *clkspec, void *data)
1561 return ERR_PTR(-ENOENT);
1563 static inline int of_clk_parent_fill(struct device_node *np,
1564 const char **parents, unsigned int size)
1568 static inline int of_clk_detect_critical(struct device_node *np, int index,
1569 unsigned long *flags)
1573 #endif /* CONFIG_OF */
1575 void clk_gate_restore_context(struct clk_hw *hw);
1577 #endif /* CLK_PROVIDER_H */