2 * linux/include/linux/clk-provider.h
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 #ifndef __LINUX_CLK_PROVIDER_H
12 #define __LINUX_CLK_PROVIDER_H
16 #include <linux/of_clk.h>
18 #ifdef CONFIG_COMMON_CLK
21 * flags used across common struct clk. these flags should only affect the
22 * top-level framework. custom flags for dealing with hardware specifics
23 * belong in struct clk_foo
25 * Please update clk_flags[] in drivers/clk/clk.c when making changes here!
27 #define CLK_SET_RATE_GATE BIT(0) /* must be gated across rate change */
28 #define CLK_SET_PARENT_GATE BIT(1) /* must be gated across re-parent */
29 #define CLK_SET_RATE_PARENT BIT(2) /* propagate rate change up one level */
30 #define CLK_IGNORE_UNUSED BIT(3) /* do not gate even if unused */
32 #define CLK_IS_BASIC BIT(5) /* Basic clk, can't do a to_clk_foo() */
33 #define CLK_GET_RATE_NOCACHE BIT(6) /* do not use the cached clk rate */
34 #define CLK_SET_RATE_NO_REPARENT BIT(7) /* don't re-parent on rate change */
35 #define CLK_GET_ACCURACY_NOCACHE BIT(8) /* do not use the cached clk accuracy */
36 #define CLK_RECALC_NEW_RATES BIT(9) /* recalc rates after notifications */
37 #define CLK_SET_RATE_UNGATE BIT(10) /* clock needs to run to set rate */
38 #define CLK_IS_CRITICAL BIT(11) /* do not gate, ever */
39 /* parents need enable during gate/ungate, set rate and re-parent */
40 #define CLK_OPS_PARENT_ENABLE BIT(12)
48 * struct clk_rate_request - Structure encoding the clk constraints that
49 * a clock user might require.
51 * @rate: Requested clock rate. This field will be adjusted by
52 * clock drivers according to hardware capabilities.
53 * @min_rate: Minimum rate imposed by clk users.
54 * @max_rate: Maximum rate imposed by clk users.
55 * @best_parent_rate: The best parent rate a parent can provide to fulfill the
56 * requested constraints.
57 * @best_parent_hw: The most appropriate parent clock that fulfills the
58 * requested constraints.
61 struct clk_rate_request {
63 unsigned long min_rate;
64 unsigned long max_rate;
65 unsigned long best_parent_rate;
66 struct clk_hw *best_parent_hw;
70 * struct clk_ops - Callback operations for hardware clocks; these are to
71 * be provided by the clock implementation, and will be called by drivers
72 * through the clk_* api.
74 * @prepare: Prepare the clock for enabling. This must not return until
75 * the clock is fully prepared, and it's safe to call clk_enable.
76 * This callback is intended to allow clock implementations to
77 * do any initialisation that may sleep. Called with
80 * @unprepare: Release the clock from its prepared state. This will typically
81 * undo any work done in the @prepare callback. Called with
84 * @is_prepared: Queries the hardware to determine if the clock is prepared.
85 * This function is allowed to sleep. Optional, if this op is not
86 * set then the prepare count will be used.
88 * @unprepare_unused: Unprepare the clock atomically. Only called from
89 * clk_disable_unused for prepare clocks with special needs.
90 * Called with prepare mutex held. This function may sleep.
92 * @enable: Enable the clock atomically. This must not return until the
93 * clock is generating a valid clock signal, usable by consumer
94 * devices. Called with enable_lock held. This function must not
97 * @disable: Disable the clock atomically. Called with enable_lock held.
98 * This function must not sleep.
100 * @is_enabled: Queries the hardware to determine if the clock is enabled.
101 * This function must not sleep. Optional, if this op is not
102 * set then the enable count will be used.
104 * @disable_unused: Disable the clock atomically. Only called from
105 * clk_disable_unused for gate clocks with special needs.
106 * Called with enable_lock held. This function must not
109 * @recalc_rate Recalculate the rate of this clock, by querying hardware. The
110 * parent rate is an input parameter. It is up to the caller to
111 * ensure that the prepare_mutex is held across this call.
112 * Returns the calculated rate. Optional, but recommended - if
113 * this op is not set then clock rate will be initialized to 0.
115 * @round_rate: Given a target rate as input, returns the closest rate actually
116 * supported by the clock. The parent rate is an input/output
119 * @determine_rate: Given a target rate as input, returns the closest rate
120 * actually supported by the clock, and optionally the parent clock
121 * that should be used to provide the clock rate.
123 * @set_parent: Change the input source of this clock; for clocks with multiple
124 * possible parents specify a new parent by passing in the index
125 * as a u8 corresponding to the parent in either the .parent_names
126 * or .parents arrays. This function in affect translates an
127 * array index into the value programmed into the hardware.
128 * Returns 0 on success, -EERROR otherwise.
130 * @get_parent: Queries the hardware to determine the parent of a clock. The
131 * return value is a u8 which specifies the index corresponding to
132 * the parent clock. This index can be applied to either the
133 * .parent_names or .parents arrays. In short, this function
134 * translates the parent value read from hardware into an array
135 * index. Currently only called when the clock is initialized by
136 * __clk_init. This callback is mandatory for clocks with
137 * multiple parents. It is optional (and unnecessary) for clocks
138 * with 0 or 1 parents.
140 * @set_rate: Change the rate of this clock. The requested rate is specified
141 * by the second argument, which should typically be the return
142 * of .round_rate call. The third argument gives the parent rate
143 * which is likely helpful for most .set_rate implementation.
144 * Returns 0 on success, -EERROR otherwise.
146 * @set_rate_and_parent: Change the rate and the parent of this clock. The
147 * requested rate is specified by the second argument, which
148 * should typically be the return of .round_rate call. The
149 * third argument gives the parent rate which is likely helpful
150 * for most .set_rate_and_parent implementation. The fourth
151 * argument gives the parent index. This callback is optional (and
152 * unnecessary) for clocks with 0 or 1 parents as well as
153 * for clocks that can tolerate switching the rate and the parent
154 * separately via calls to .set_parent and .set_rate.
155 * Returns 0 on success, -EERROR otherwise.
157 * @recalc_accuracy: Recalculate the accuracy of this clock. The clock accuracy
158 * is expressed in ppb (parts per billion). The parent accuracy is
159 * an input parameter.
160 * Returns the calculated accuracy. Optional - if this op is not
161 * set then clock accuracy will be initialized to parent accuracy
162 * or 0 (perfect clock) if clock has no parent.
164 * @get_phase: Queries the hardware to get the current phase of a clock.
165 * Returned values are 0-359 degrees on success, negative
166 * error codes on failure.
168 * @set_phase: Shift the phase this clock signal in degrees specified
169 * by the second argument. Valid values for degrees are
170 * 0-359. Return 0 on success, otherwise -EERROR.
172 * @init: Perform platform-specific initialization magic.
173 * This is not not used by any of the basic clock types.
174 * Please consider other ways of solving initialization problems
175 * before using this callback, as its use is discouraged.
177 * @debug_init: Set up type-specific debugfs entries for this clock. This
178 * is called once, after the debugfs directory entry for this
179 * clock has been created. The dentry pointer representing that
180 * directory is provided as an argument. Called with
181 * prepare_lock held. Returns 0 on success, -EERROR otherwise.
184 * The clk_enable/clk_disable and clk_prepare/clk_unprepare pairs allow
185 * implementations to split any work between atomic (enable) and sleepable
186 * (prepare) contexts. If enabling a clock requires code that might sleep,
187 * this must be done in clk_prepare. Clock enable code that will never be
188 * called in a sleepable context may be implemented in clk_enable.
190 * Typically, drivers will call clk_prepare when a clock may be needed later
191 * (eg. when a device is opened), and clk_enable when the clock is actually
192 * required (eg. from an interrupt). Note that clk_prepare MUST have been
193 * called before clk_enable.
196 int (*prepare)(struct clk_hw *hw);
197 void (*unprepare)(struct clk_hw *hw);
198 int (*is_prepared)(struct clk_hw *hw);
199 void (*unprepare_unused)(struct clk_hw *hw);
200 int (*enable)(struct clk_hw *hw);
201 void (*disable)(struct clk_hw *hw);
202 int (*is_enabled)(struct clk_hw *hw);
203 void (*disable_unused)(struct clk_hw *hw);
204 unsigned long (*recalc_rate)(struct clk_hw *hw,
205 unsigned long parent_rate);
206 long (*round_rate)(struct clk_hw *hw, unsigned long rate,
207 unsigned long *parent_rate);
208 int (*determine_rate)(struct clk_hw *hw,
209 struct clk_rate_request *req);
210 int (*set_parent)(struct clk_hw *hw, u8 index);
211 u8 (*get_parent)(struct clk_hw *hw);
212 int (*set_rate)(struct clk_hw *hw, unsigned long rate,
213 unsigned long parent_rate);
214 int (*set_rate_and_parent)(struct clk_hw *hw,
216 unsigned long parent_rate, u8 index);
217 unsigned long (*recalc_accuracy)(struct clk_hw *hw,
218 unsigned long parent_accuracy);
219 int (*get_phase)(struct clk_hw *hw);
220 int (*set_phase)(struct clk_hw *hw, int degrees);
221 void (*init)(struct clk_hw *hw);
222 void (*debug_init)(struct clk_hw *hw, struct dentry *dentry);
226 * struct clk_init_data - holds init data that's common to all clocks and is
227 * shared between the clock provider and the common clock framework.
230 * @ops: operations this clock supports
231 * @parent_names: array of string names for all possible parents
232 * @num_parents: number of possible parents
233 * @flags: framework-level hints and quirks
235 struct clk_init_data {
237 const struct clk_ops *ops;
238 const char * const *parent_names;
244 * struct clk_hw - handle for traversing from a struct clk to its corresponding
245 * hardware-specific structure. struct clk_hw should be declared within struct
246 * clk_foo and then referenced by the struct clk instance that uses struct
249 * @core: pointer to the struct clk_core instance that points back to this
250 * struct clk_hw instance
252 * @clk: pointer to the per-user struct clk instance that can be used to call
255 * @init: pointer to struct clk_init_data that contains the init data shared
256 * with the common clock framework.
259 struct clk_core *core;
261 const struct clk_init_data *init;
265 * DOC: Basic clock implementations common to many platforms
267 * Each basic clock hardware type is comprised of a structure describing the
268 * clock hardware, implementations of the relevant callbacks in struct clk_ops,
269 * unique flags for that hardware type, a registration function and an
270 * alternative macro for static initialization
274 * struct clk_fixed_rate - fixed-rate clock
275 * @hw: handle between common and hardware-specific interfaces
276 * @fixed_rate: constant frequency of clock
278 struct clk_fixed_rate {
280 unsigned long fixed_rate;
281 unsigned long fixed_accuracy;
285 #define to_clk_fixed_rate(_hw) container_of(_hw, struct clk_fixed_rate, hw)
287 extern const struct clk_ops clk_fixed_rate_ops;
288 struct clk *clk_register_fixed_rate(struct device *dev, const char *name,
289 const char *parent_name, unsigned long flags,
290 unsigned long fixed_rate);
291 struct clk_hw *clk_hw_register_fixed_rate(struct device *dev, const char *name,
292 const char *parent_name, unsigned long flags,
293 unsigned long fixed_rate);
294 struct clk *clk_register_fixed_rate_with_accuracy(struct device *dev,
295 const char *name, const char *parent_name, unsigned long flags,
296 unsigned long fixed_rate, unsigned long fixed_accuracy);
297 void clk_unregister_fixed_rate(struct clk *clk);
298 struct clk_hw *clk_hw_register_fixed_rate_with_accuracy(struct device *dev,
299 const char *name, const char *parent_name, unsigned long flags,
300 unsigned long fixed_rate, unsigned long fixed_accuracy);
301 void clk_hw_unregister_fixed_rate(struct clk_hw *hw);
303 void of_fixed_clk_setup(struct device_node *np);
306 * struct clk_gate - gating clock
308 * @hw: handle between common and hardware-specific interfaces
309 * @reg: register controlling gate
310 * @bit_idx: single bit controlling gate
311 * @flags: hardware-specific flags
312 * @lock: register lock
314 * Clock which can gate its output. Implements .enable & .disable
317 * CLK_GATE_SET_TO_DISABLE - by default this clock sets the bit at bit_idx to
318 * enable the clock. Setting this flag does the opposite: setting the bit
319 * disable the clock and clearing it enables the clock
320 * CLK_GATE_HIWORD_MASK - The gate settings are only in lower 16-bit
321 * of this register, and mask of gate bits are in higher 16-bit of this
322 * register. While setting the gate bits, higher 16-bit should also be
323 * updated to indicate changing gate bits.
333 #define to_clk_gate(_hw) container_of(_hw, struct clk_gate, hw)
335 #define CLK_GATE_SET_TO_DISABLE BIT(0)
336 #define CLK_GATE_HIWORD_MASK BIT(1)
338 extern const struct clk_ops clk_gate_ops;
339 struct clk *clk_register_gate(struct device *dev, const char *name,
340 const char *parent_name, unsigned long flags,
341 void __iomem *reg, u8 bit_idx,
342 u8 clk_gate_flags, spinlock_t *lock);
343 struct clk_hw *clk_hw_register_gate(struct device *dev, const char *name,
344 const char *parent_name, unsigned long flags,
345 void __iomem *reg, u8 bit_idx,
346 u8 clk_gate_flags, spinlock_t *lock);
347 void clk_unregister_gate(struct clk *clk);
348 void clk_hw_unregister_gate(struct clk_hw *hw);
349 int clk_gate_is_enabled(struct clk_hw *hw);
351 struct clk_div_table {
357 * struct clk_divider - adjustable divider clock
359 * @hw: handle between common and hardware-specific interfaces
360 * @reg: register containing the divider
361 * @shift: shift to the divider bit field
362 * @width: width of the divider bit field
363 * @table: array of value/divider pairs, last entry should have div = 0
364 * @lock: register lock
366 * Clock with an adjustable divider affecting its output frequency. Implements
367 * .recalc_rate, .set_rate and .round_rate
370 * CLK_DIVIDER_ONE_BASED - by default the divisor is the value read from the
371 * register plus one. If CLK_DIVIDER_ONE_BASED is set then the divider is
372 * the raw value read from the register, with the value of zero considered
373 * invalid, unless CLK_DIVIDER_ALLOW_ZERO is set.
374 * CLK_DIVIDER_POWER_OF_TWO - clock divisor is 2 raised to the value read from
375 * the hardware register
376 * CLK_DIVIDER_ALLOW_ZERO - Allow zero divisors. For dividers which have
377 * CLK_DIVIDER_ONE_BASED set, it is possible to end up with a zero divisor.
378 * Some hardware implementations gracefully handle this case and allow a
379 * zero divisor by not modifying their input clock
380 * (divide by one / bypass).
381 * CLK_DIVIDER_HIWORD_MASK - The divider settings are only in lower 16-bit
382 * of this register, and mask of divider bits are in higher 16-bit of this
383 * register. While setting the divider bits, higher 16-bit should also be
384 * updated to indicate changing divider bits.
385 * CLK_DIVIDER_ROUND_CLOSEST - Makes the best calculated divider to be rounded
386 * to the closest integer instead of the up one.
387 * CLK_DIVIDER_READ_ONLY - The divider settings are preconfigured and should
388 * not be changed by the clock framework.
389 * CLK_DIVIDER_MAX_AT_ZERO - For dividers which are like CLK_DIVIDER_ONE_BASED
390 * except when the value read from the register is zero, the divisor is
391 * 2^width of the field.
399 const struct clk_div_table *table;
403 #define clk_div_mask(width) ((1 << (width)) - 1)
404 #define to_clk_divider(_hw) container_of(_hw, struct clk_divider, hw)
406 #define CLK_DIVIDER_ONE_BASED BIT(0)
407 #define CLK_DIVIDER_POWER_OF_TWO BIT(1)
408 #define CLK_DIVIDER_ALLOW_ZERO BIT(2)
409 #define CLK_DIVIDER_HIWORD_MASK BIT(3)
410 #define CLK_DIVIDER_ROUND_CLOSEST BIT(4)
411 #define CLK_DIVIDER_READ_ONLY BIT(5)
412 #define CLK_DIVIDER_MAX_AT_ZERO BIT(6)
414 extern const struct clk_ops clk_divider_ops;
415 extern const struct clk_ops clk_divider_ro_ops;
417 unsigned long divider_recalc_rate(struct clk_hw *hw, unsigned long parent_rate,
418 unsigned int val, const struct clk_div_table *table,
419 unsigned long flags, unsigned long width);
420 long divider_round_rate_parent(struct clk_hw *hw, struct clk_hw *parent,
421 unsigned long rate, unsigned long *prate,
422 const struct clk_div_table *table,
423 u8 width, unsigned long flags);
424 long divider_ro_round_rate_parent(struct clk_hw *hw, struct clk_hw *parent,
425 unsigned long rate, unsigned long *prate,
426 const struct clk_div_table *table, u8 width,
427 unsigned long flags, unsigned int val);
428 int divider_get_val(unsigned long rate, unsigned long parent_rate,
429 const struct clk_div_table *table, u8 width,
430 unsigned long flags);
432 struct clk *clk_register_divider(struct device *dev, const char *name,
433 const char *parent_name, unsigned long flags,
434 void __iomem *reg, u8 shift, u8 width,
435 u8 clk_divider_flags, spinlock_t *lock);
436 struct clk_hw *clk_hw_register_divider(struct device *dev, const char *name,
437 const char *parent_name, unsigned long flags,
438 void __iomem *reg, u8 shift, u8 width,
439 u8 clk_divider_flags, spinlock_t *lock);
440 struct clk *clk_register_divider_table(struct device *dev, const char *name,
441 const char *parent_name, unsigned long flags,
442 void __iomem *reg, u8 shift, u8 width,
443 u8 clk_divider_flags, const struct clk_div_table *table,
445 struct clk_hw *clk_hw_register_divider_table(struct device *dev,
446 const char *name, const char *parent_name, unsigned long flags,
447 void __iomem *reg, u8 shift, u8 width,
448 u8 clk_divider_flags, const struct clk_div_table *table,
450 void clk_unregister_divider(struct clk *clk);
451 void clk_hw_unregister_divider(struct clk_hw *hw);
454 * struct clk_mux - multiplexer clock
456 * @hw: handle between common and hardware-specific interfaces
457 * @reg: register controlling multiplexer
458 * @table: array of register values corresponding to the parent index
459 * @shift: shift to multiplexer bit field
460 * @mask: mask of mutliplexer bit field
461 * @flags: hardware-specific flags
462 * @lock: register lock
464 * Clock with multiple selectable parents. Implements .get_parent, .set_parent
468 * CLK_MUX_INDEX_ONE - register index starts at 1, not 0
469 * CLK_MUX_INDEX_BIT - register index is a single bit (power of two)
470 * CLK_MUX_HIWORD_MASK - The mux settings are only in lower 16-bit of this
471 * register, and mask of mux bits are in higher 16-bit of this register.
472 * While setting the mux bits, higher 16-bit should also be updated to
473 * indicate changing mux bits.
474 * CLK_MUX_ROUND_CLOSEST - Use the parent rate that is closest to the desired
487 #define to_clk_mux(_hw) container_of(_hw, struct clk_mux, hw)
489 #define CLK_MUX_INDEX_ONE BIT(0)
490 #define CLK_MUX_INDEX_BIT BIT(1)
491 #define CLK_MUX_HIWORD_MASK BIT(2)
492 #define CLK_MUX_READ_ONLY BIT(3) /* mux can't be changed */
493 #define CLK_MUX_ROUND_CLOSEST BIT(4)
495 extern const struct clk_ops clk_mux_ops;
496 extern const struct clk_ops clk_mux_ro_ops;
498 struct clk *clk_register_mux(struct device *dev, const char *name,
499 const char * const *parent_names, u8 num_parents,
501 void __iomem *reg, u8 shift, u8 width,
502 u8 clk_mux_flags, spinlock_t *lock);
503 struct clk_hw *clk_hw_register_mux(struct device *dev, const char *name,
504 const char * const *parent_names, u8 num_parents,
506 void __iomem *reg, u8 shift, u8 width,
507 u8 clk_mux_flags, spinlock_t *lock);
509 struct clk *clk_register_mux_table(struct device *dev, const char *name,
510 const char * const *parent_names, u8 num_parents,
512 void __iomem *reg, u8 shift, u32 mask,
513 u8 clk_mux_flags, u32 *table, spinlock_t *lock);
514 struct clk_hw *clk_hw_register_mux_table(struct device *dev, const char *name,
515 const char * const *parent_names, u8 num_parents,
517 void __iomem *reg, u8 shift, u32 mask,
518 u8 clk_mux_flags, u32 *table, spinlock_t *lock);
520 int clk_mux_val_to_index(struct clk_hw *hw, u32 *table, unsigned int flags,
522 unsigned int clk_mux_index_to_val(u32 *table, unsigned int flags, u8 index);
524 void clk_unregister_mux(struct clk *clk);
525 void clk_hw_unregister_mux(struct clk_hw *hw);
527 void of_fixed_factor_clk_setup(struct device_node *node);
530 * struct clk_fixed_factor - fixed multiplier and divider clock
532 * @hw: handle between common and hardware-specific interfaces
536 * Clock with a fixed multiplier and divider. The output frequency is the
537 * parent clock rate divided by div and multiplied by mult.
538 * Implements .recalc_rate, .set_rate and .round_rate
541 struct clk_fixed_factor {
547 #define to_clk_fixed_factor(_hw) container_of(_hw, struct clk_fixed_factor, hw)
549 extern const struct clk_ops clk_fixed_factor_ops;
550 struct clk *clk_register_fixed_factor(struct device *dev, const char *name,
551 const char *parent_name, unsigned long flags,
552 unsigned int mult, unsigned int div);
553 void clk_unregister_fixed_factor(struct clk *clk);
554 struct clk_hw *clk_hw_register_fixed_factor(struct device *dev,
555 const char *name, const char *parent_name, unsigned long flags,
556 unsigned int mult, unsigned int div);
557 void clk_hw_unregister_fixed_factor(struct clk_hw *hw);
560 * struct clk_fractional_divider - adjustable fractional divider clock
562 * @hw: handle between common and hardware-specific interfaces
563 * @reg: register containing the divider
564 * @mshift: shift to the numerator bit field
565 * @mwidth: width of the numerator bit field
566 * @nshift: shift to the denominator bit field
567 * @nwidth: width of the denominator bit field
568 * @lock: register lock
570 * Clock with adjustable fractional divider affecting its output frequency.
572 struct clk_fractional_divider {
582 void (*approximation)(struct clk_hw *hw,
583 unsigned long rate, unsigned long *parent_rate,
584 unsigned long *m, unsigned long *n);
588 #define to_clk_fd(_hw) container_of(_hw, struct clk_fractional_divider, hw)
590 extern const struct clk_ops clk_fractional_divider_ops;
591 struct clk *clk_register_fractional_divider(struct device *dev,
592 const char *name, const char *parent_name, unsigned long flags,
593 void __iomem *reg, u8 mshift, u8 mwidth, u8 nshift, u8 nwidth,
594 u8 clk_divider_flags, spinlock_t *lock);
595 struct clk_hw *clk_hw_register_fractional_divider(struct device *dev,
596 const char *name, const char *parent_name, unsigned long flags,
597 void __iomem *reg, u8 mshift, u8 mwidth, u8 nshift, u8 nwidth,
598 u8 clk_divider_flags, spinlock_t *lock);
599 void clk_hw_unregister_fractional_divider(struct clk_hw *hw);
602 * struct clk_multiplier - adjustable multiplier clock
604 * @hw: handle between common and hardware-specific interfaces
605 * @reg: register containing the multiplier
606 * @shift: shift to the multiplier bit field
607 * @width: width of the multiplier bit field
608 * @lock: register lock
610 * Clock with an adjustable multiplier affecting its output frequency.
611 * Implements .recalc_rate, .set_rate and .round_rate
614 * CLK_MULTIPLIER_ZERO_BYPASS - By default, the multiplier is the value read
615 * from the register, with 0 being a valid value effectively
616 * zeroing the output clock rate. If CLK_MULTIPLIER_ZERO_BYPASS is
617 * set, then a null multiplier will be considered as a bypass,
618 * leaving the parent rate unmodified.
619 * CLK_MULTIPLIER_ROUND_CLOSEST - Makes the best calculated divider to be
620 * rounded to the closest integer instead of the down one.
622 struct clk_multiplier {
631 #define to_clk_multiplier(_hw) container_of(_hw, struct clk_multiplier, hw)
633 #define CLK_MULTIPLIER_ZERO_BYPASS BIT(0)
634 #define CLK_MULTIPLIER_ROUND_CLOSEST BIT(1)
636 extern const struct clk_ops clk_multiplier_ops;
639 * struct clk_composite - aggregate clock of mux, divider and gate clocks
641 * @hw: handle between common and hardware-specific interfaces
642 * @mux_hw: handle between composite and hardware-specific mux clock
643 * @rate_hw: handle between composite and hardware-specific rate clock
644 * @gate_hw: handle between composite and hardware-specific gate clock
645 * @mux_ops: clock ops for mux
646 * @rate_ops: clock ops for rate
647 * @gate_ops: clock ops for gate
649 struct clk_composite {
653 struct clk_hw *mux_hw;
654 struct clk_hw *rate_hw;
655 struct clk_hw *gate_hw;
657 const struct clk_ops *mux_ops;
658 const struct clk_ops *rate_ops;
659 const struct clk_ops *gate_ops;
662 #define to_clk_composite(_hw) container_of(_hw, struct clk_composite, hw)
664 struct clk *clk_register_composite(struct device *dev, const char *name,
665 const char * const *parent_names, int num_parents,
666 struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
667 struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
668 struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
669 unsigned long flags);
670 void clk_unregister_composite(struct clk *clk);
671 struct clk_hw *clk_hw_register_composite(struct device *dev, const char *name,
672 const char * const *parent_names, int num_parents,
673 struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
674 struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
675 struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
676 unsigned long flags);
677 void clk_hw_unregister_composite(struct clk_hw *hw);
680 * struct clk_gpio_gate - gpio gated clock
682 * @hw: handle between common and hardware-specific interfaces
683 * @gpiod: gpio descriptor
685 * Clock with a gpio control for enabling and disabling the parent clock.
686 * Implements .enable, .disable and .is_enabled
691 struct gpio_desc *gpiod;
694 #define to_clk_gpio(_hw) container_of(_hw, struct clk_gpio, hw)
696 extern const struct clk_ops clk_gpio_gate_ops;
697 struct clk *clk_register_gpio_gate(struct device *dev, const char *name,
698 const char *parent_name, struct gpio_desc *gpiod,
699 unsigned long flags);
700 struct clk_hw *clk_hw_register_gpio_gate(struct device *dev, const char *name,
701 const char *parent_name, struct gpio_desc *gpiod,
702 unsigned long flags);
703 void clk_hw_unregister_gpio_gate(struct clk_hw *hw);
706 * struct clk_gpio_mux - gpio controlled clock multiplexer
708 * @hw: see struct clk_gpio
709 * @gpiod: gpio descriptor to select the parent of this clock multiplexer
711 * Clock with a gpio control for selecting the parent clock.
712 * Implements .get_parent, .set_parent and .determine_rate
715 extern const struct clk_ops clk_gpio_mux_ops;
716 struct clk *clk_register_gpio_mux(struct device *dev, const char *name,
717 const char * const *parent_names, u8 num_parents, struct gpio_desc *gpiod,
718 unsigned long flags);
719 struct clk_hw *clk_hw_register_gpio_mux(struct device *dev, const char *name,
720 const char * const *parent_names, u8 num_parents, struct gpio_desc *gpiod,
721 unsigned long flags);
722 void clk_hw_unregister_gpio_mux(struct clk_hw *hw);
725 * clk_register - allocate a new clock, register it and return an opaque cookie
726 * @dev: device that is registering this clock
727 * @hw: link to hardware-specific clock data
729 * clk_register is the primary interface for populating the clock tree with new
730 * clock nodes. It returns a pointer to the newly allocated struct clk which
731 * cannot be dereferenced by driver code but may be used in conjuction with the
732 * rest of the clock API. In the event of an error clk_register will return an
733 * error code; drivers must test for an error code after calling clk_register.
735 struct clk *clk_register(struct device *dev, struct clk_hw *hw);
736 struct clk *devm_clk_register(struct device *dev, struct clk_hw *hw);
738 int __must_check clk_hw_register(struct device *dev, struct clk_hw *hw);
739 int __must_check devm_clk_hw_register(struct device *dev, struct clk_hw *hw);
741 void clk_unregister(struct clk *clk);
742 void devm_clk_unregister(struct device *dev, struct clk *clk);
744 void clk_hw_unregister(struct clk_hw *hw);
745 void devm_clk_hw_unregister(struct device *dev, struct clk_hw *hw);
747 /* helper functions */
748 const char *__clk_get_name(const struct clk *clk);
749 const char *clk_hw_get_name(const struct clk_hw *hw);
750 struct clk_hw *__clk_get_hw(struct clk *clk);
751 unsigned int clk_hw_get_num_parents(const struct clk_hw *hw);
752 struct clk_hw *clk_hw_get_parent(const struct clk_hw *hw);
753 struct clk_hw *clk_hw_get_parent_by_index(const struct clk_hw *hw,
755 unsigned int __clk_get_enable_count(struct clk *clk);
756 unsigned long clk_hw_get_rate(const struct clk_hw *hw);
757 unsigned long __clk_get_flags(struct clk *clk);
758 unsigned long clk_hw_get_flags(const struct clk_hw *hw);
759 bool clk_hw_is_prepared(const struct clk_hw *hw);
760 bool clk_hw_rate_is_protected(const struct clk_hw *hw);
761 bool clk_hw_is_enabled(const struct clk_hw *hw);
762 bool __clk_is_enabled(struct clk *clk);
763 struct clk *__clk_lookup(const char *name);
764 int __clk_mux_determine_rate(struct clk_hw *hw,
765 struct clk_rate_request *req);
766 int __clk_determine_rate(struct clk_hw *core, struct clk_rate_request *req);
767 int __clk_mux_determine_rate_closest(struct clk_hw *hw,
768 struct clk_rate_request *req);
769 int clk_mux_determine_rate_flags(struct clk_hw *hw,
770 struct clk_rate_request *req,
771 unsigned long flags);
772 void clk_hw_reparent(struct clk_hw *hw, struct clk_hw *new_parent);
773 void clk_hw_set_rate_range(struct clk_hw *hw, unsigned long min_rate,
774 unsigned long max_rate);
776 static inline void __clk_hw_set_clk(struct clk_hw *dst, struct clk_hw *src)
779 dst->core = src->core;
782 static inline long divider_round_rate(struct clk_hw *hw, unsigned long rate,
783 unsigned long *prate,
784 const struct clk_div_table *table,
785 u8 width, unsigned long flags)
787 return divider_round_rate_parent(hw, clk_hw_get_parent(hw),
788 rate, prate, table, width, flags);
791 static inline long divider_ro_round_rate(struct clk_hw *hw, unsigned long rate,
792 unsigned long *prate,
793 const struct clk_div_table *table,
794 u8 width, unsigned long flags,
797 return divider_ro_round_rate_parent(hw, clk_hw_get_parent(hw),
798 rate, prate, table, width, flags,
803 * FIXME clock api without lock protection
805 unsigned long clk_hw_round_rate(struct clk_hw *hw, unsigned long rate);
809 struct clk_onecell_data {
811 unsigned int clk_num;
814 struct clk_hw_onecell_data {
816 struct clk_hw *hws[];
819 extern struct of_device_id __clk_of_table;
821 #define CLK_OF_DECLARE(name, compat, fn) OF_DECLARE_1(clk, name, compat, fn)
824 * Use this macro when you have a driver that requires two initialization
825 * routines, one at of_clk_init(), and one at platform device probe
827 #define CLK_OF_DECLARE_DRIVER(name, compat, fn) \
828 static void __init name##_of_clk_init_driver(struct device_node *np) \
830 of_node_clear_flag(np, OF_POPULATED); \
833 OF_DECLARE_1(clk, name, compat, name##_of_clk_init_driver)
835 #define CLK_HW_INIT(_name, _parent, _ops, _flags) \
836 (&(struct clk_init_data) { \
839 .parent_names = (const char *[]) { _parent }, \
844 #define CLK_HW_INIT_PARENTS(_name, _parents, _ops, _flags) \
845 (&(struct clk_init_data) { \
848 .parent_names = _parents, \
849 .num_parents = ARRAY_SIZE(_parents), \
853 #define CLK_HW_INIT_NO_PARENT(_name, _ops, _flags) \
854 (&(struct clk_init_data) { \
857 .parent_names = NULL, \
862 #define CLK_FIXED_FACTOR(_struct, _name, _parent, \
863 _div, _mult, _flags) \
864 struct clk_fixed_factor _struct = { \
867 .hw.init = CLK_HW_INIT(_name, \
869 &clk_fixed_factor_ops, \
874 int of_clk_add_provider(struct device_node *np,
875 struct clk *(*clk_src_get)(struct of_phandle_args *args,
878 int of_clk_add_hw_provider(struct device_node *np,
879 struct clk_hw *(*get)(struct of_phandle_args *clkspec,
882 int devm_of_clk_add_hw_provider(struct device *dev,
883 struct clk_hw *(*get)(struct of_phandle_args *clkspec,
886 void of_clk_del_provider(struct device_node *np);
887 void devm_of_clk_del_provider(struct device *dev);
888 struct clk *of_clk_src_simple_get(struct of_phandle_args *clkspec,
890 struct clk_hw *of_clk_hw_simple_get(struct of_phandle_args *clkspec,
892 struct clk *of_clk_src_onecell_get(struct of_phandle_args *clkspec, void *data);
893 struct clk_hw *of_clk_hw_onecell_get(struct of_phandle_args *clkspec,
895 int of_clk_parent_fill(struct device_node *np, const char **parents,
897 int of_clk_detect_critical(struct device_node *np, int index,
898 unsigned long *flags);
900 #else /* !CONFIG_OF */
902 static inline int of_clk_add_provider(struct device_node *np,
903 struct clk *(*clk_src_get)(struct of_phandle_args *args,
909 static inline int of_clk_add_hw_provider(struct device_node *np,
910 struct clk_hw *(*get)(struct of_phandle_args *clkspec,
916 static inline int devm_of_clk_add_hw_provider(struct device *dev,
917 struct clk_hw *(*get)(struct of_phandle_args *clkspec,
923 static inline void of_clk_del_provider(struct device_node *np) {}
924 static inline void devm_of_clk_del_provider(struct device *dev) {}
925 static inline struct clk *of_clk_src_simple_get(
926 struct of_phandle_args *clkspec, void *data)
928 return ERR_PTR(-ENOENT);
930 static inline struct clk_hw *
931 of_clk_hw_simple_get(struct of_phandle_args *clkspec, void *data)
933 return ERR_PTR(-ENOENT);
935 static inline struct clk *of_clk_src_onecell_get(
936 struct of_phandle_args *clkspec, void *data)
938 return ERR_PTR(-ENOENT);
940 static inline struct clk_hw *
941 of_clk_hw_onecell_get(struct of_phandle_args *clkspec, void *data)
943 return ERR_PTR(-ENOENT);
945 static inline int of_clk_parent_fill(struct device_node *np,
946 const char **parents, unsigned int size)
950 static inline int of_clk_detect_critical(struct device_node *np, int index,
951 unsigned long *flags)
955 #endif /* CONFIG_OF */
958 * wrap access to peripherals in accessor routines
959 * for improved portability across platforms
962 #if IS_ENABLED(CONFIG_PPC)
964 static inline u32 clk_readl(u32 __iomem *reg)
966 return ioread32be(reg);
969 static inline void clk_writel(u32 val, u32 __iomem *reg)
971 iowrite32be(val, reg);
974 #else /* platform dependent I/O accessors */
976 static inline u32 clk_readl(u32 __iomem *reg)
981 static inline void clk_writel(u32 val, u32 __iomem *reg)
986 #endif /* platform dependent I/O accessors */
988 #endif /* CONFIG_COMMON_CLK */
989 #endif /* CLK_PROVIDER_H */