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1221 lines
35 KiB
1221 lines
35 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* linux/include/linux/clk.h |
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* |
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* Copyright (C) 2004 ARM Limited. |
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* Written by Deep Blue Solutions Limited. |
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* Copyright (C) 2011-2012 Linaro Ltd <[email protected]> |
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*/ |
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#ifndef __LINUX_CLK_H |
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#define __LINUX_CLK_H |
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|
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#include <linux/err.h> |
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#include <linux/kernel.h> |
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#include <linux/notifier.h> |
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struct device; |
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struct clk; |
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struct device_node; |
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struct of_phandle_args; |
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|
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/** |
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* DOC: clk notifier callback types |
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* |
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* PRE_RATE_CHANGE - called immediately before the clk rate is changed, |
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* to indicate that the rate change will proceed. Drivers must |
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* immediately terminate any operations that will be affected by the |
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* rate change. Callbacks may either return NOTIFY_DONE, NOTIFY_OK, |
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* NOTIFY_STOP or NOTIFY_BAD. |
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* |
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* ABORT_RATE_CHANGE: called if the rate change failed for some reason |
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* after PRE_RATE_CHANGE. In this case, all registered notifiers on |
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* the clk will be called with ABORT_RATE_CHANGE. Callbacks must |
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* always return NOTIFY_DONE or NOTIFY_OK. |
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* |
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* POST_RATE_CHANGE - called after the clk rate change has successfully |
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* completed. Callbacks must always return NOTIFY_DONE or NOTIFY_OK. |
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* |
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*/ |
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#define PRE_RATE_CHANGE BIT(0) |
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#define POST_RATE_CHANGE BIT(1) |
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#define ABORT_RATE_CHANGE BIT(2) |
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/** |
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* struct clk_notifier - associate a clk with a notifier |
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* @clk: struct clk * to associate the notifier with |
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* @notifier_head: a blocking_notifier_head for this clk |
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* @node: linked list pointers |
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* |
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* A list of struct clk_notifier is maintained by the notifier code. |
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* An entry is created whenever code registers the first notifier on a |
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* particular @clk. Future notifiers on that @clk are added to the |
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* @notifier_head. |
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*/ |
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struct clk_notifier { |
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struct clk *clk; |
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struct srcu_notifier_head notifier_head; |
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struct list_head node; |
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}; |
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/** |
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* struct clk_notifier_data - rate data to pass to the notifier callback |
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* @clk: struct clk * being changed |
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* @old_rate: previous rate of this clk |
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* @new_rate: new rate of this clk |
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* |
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* For a pre-notifier, old_rate is the clk's rate before this rate |
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* change, and new_rate is what the rate will be in the future. For a |
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* post-notifier, old_rate and new_rate are both set to the clk's |
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* current rate (this was done to optimize the implementation). |
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*/ |
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struct clk_notifier_data { |
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struct clk *clk; |
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unsigned long old_rate; |
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unsigned long new_rate; |
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}; |
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/** |
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* struct clk_bulk_data - Data used for bulk clk operations. |
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* |
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* @id: clock consumer ID |
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* @clk: struct clk * to store the associated clock |
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* |
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* The CLK APIs provide a series of clk_bulk_() API calls as |
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* a convenience to consumers which require multiple clks. This |
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* structure is used to manage data for these calls. |
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*/ |
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struct clk_bulk_data { |
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const char *id; |
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struct clk *clk; |
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}; |
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#ifdef CONFIG_COMMON_CLK |
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/** |
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* clk_notifier_register - register a clock rate-change notifier callback |
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* @clk: clock whose rate we are interested in |
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* @nb: notifier block with callback function pointer |
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* |
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* ProTip: debugging across notifier chains can be frustrating. Make sure that |
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* your notifier callback function prints a nice big warning in case of |
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* failure. |
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*/ |
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int clk_notifier_register(struct clk *clk, struct notifier_block *nb); |
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|
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/** |
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* clk_notifier_unregister - unregister a clock rate-change notifier callback |
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* @clk: clock whose rate we are no longer interested in |
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* @nb: notifier block which will be unregistered |
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*/ |
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int clk_notifier_unregister(struct clk *clk, struct notifier_block *nb); |
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/** |
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* devm_clk_notifier_register - register a managed rate-change notifier callback |
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* @dev: device for clock "consumer" |
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* @clk: clock whose rate we are interested in |
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* @nb: notifier block with callback function pointer |
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* |
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* Returns 0 on success, -EERROR otherwise |
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*/ |
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int devm_clk_notifier_register(struct device *dev, struct clk *clk, |
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struct notifier_block *nb); |
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|
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/** |
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* clk_get_accuracy - obtain the clock accuracy in ppb (parts per billion) |
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* for a clock source. |
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* @clk: clock source |
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* |
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* This gets the clock source accuracy expressed in ppb. |
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* A perfect clock returns 0. |
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*/ |
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long clk_get_accuracy(struct clk *clk); |
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|
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/** |
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* clk_set_phase - adjust the phase shift of a clock signal |
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* @clk: clock signal source |
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* @degrees: number of degrees the signal is shifted |
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* |
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* Shifts the phase of a clock signal by the specified degrees. Returns 0 on |
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* success, -EERROR otherwise. |
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*/ |
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int clk_set_phase(struct clk *clk, int degrees); |
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|
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/** |
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* clk_get_phase - return the phase shift of a clock signal |
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* @clk: clock signal source |
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* |
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* Returns the phase shift of a clock node in degrees, otherwise returns |
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* -EERROR. |
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*/ |
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int clk_get_phase(struct clk *clk); |
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|
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/** |
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* clk_set_duty_cycle - adjust the duty cycle ratio of a clock signal |
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* @clk: clock signal source |
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* @num: numerator of the duty cycle ratio to be applied |
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* @den: denominator of the duty cycle ratio to be applied |
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* |
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* Adjust the duty cycle of a clock signal by the specified ratio. Returns 0 on |
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* success, -EERROR otherwise. |
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*/ |
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int clk_set_duty_cycle(struct clk *clk, unsigned int num, unsigned int den); |
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/** |
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* clk_get_scaled_duty_cycle - return the duty cycle ratio of a clock signal |
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* @clk: clock signal source |
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* @scale: scaling factor to be applied to represent the ratio as an integer |
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* |
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* Returns the duty cycle ratio multiplied by the scale provided, otherwise |
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* returns -EERROR. |
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*/ |
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int clk_get_scaled_duty_cycle(struct clk *clk, unsigned int scale); |
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|
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/** |
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* clk_is_match - check if two clk's point to the same hardware clock |
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* @p: clk compared against q |
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* @q: clk compared against p |
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* |
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* Returns true if the two struct clk pointers both point to the same hardware |
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* clock node. Put differently, returns true if @p and @q |
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* share the same &struct clk_core object. |
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* |
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* Returns false otherwise. Note that two NULL clks are treated as matching. |
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*/ |
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bool clk_is_match(const struct clk *p, const struct clk *q); |
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#else |
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static inline int clk_notifier_register(struct clk *clk, |
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struct notifier_block *nb) |
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{ |
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return -ENOTSUPP; |
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} |
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static inline int clk_notifier_unregister(struct clk *clk, |
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struct notifier_block *nb) |
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{ |
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return -ENOTSUPP; |
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} |
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static inline int devm_clk_notifier_register(struct device *dev, |
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struct clk *clk, |
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struct notifier_block *nb) |
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{ |
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return -ENOTSUPP; |
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} |
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static inline long clk_get_accuracy(struct clk *clk) |
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{ |
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return -ENOTSUPP; |
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} |
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static inline long clk_set_phase(struct clk *clk, int phase) |
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{ |
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return -ENOTSUPP; |
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} |
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static inline long clk_get_phase(struct clk *clk) |
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{ |
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return -ENOTSUPP; |
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} |
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static inline int clk_set_duty_cycle(struct clk *clk, unsigned int num, |
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unsigned int den) |
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{ |
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return -ENOTSUPP; |
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} |
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static inline unsigned int clk_get_scaled_duty_cycle(struct clk *clk, |
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unsigned int scale) |
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{ |
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return 0; |
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} |
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static inline bool clk_is_match(const struct clk *p, const struct clk *q) |
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{ |
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return p == q; |
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} |
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#endif |
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#ifdef CONFIG_HAVE_CLK_PREPARE |
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/** |
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* clk_prepare - prepare a clock source |
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* @clk: clock source |
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* |
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* This prepares the clock source for use. |
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* |
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* Must not be called from within atomic context. |
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*/ |
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int clk_prepare(struct clk *clk); |
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int __must_check clk_bulk_prepare(int num_clks, |
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const struct clk_bulk_data *clks); |
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/** |
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* clk_is_enabled_when_prepared - indicate if preparing a clock also enables it. |
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* @clk: clock source |
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* |
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* Returns true if clk_prepare() implicitly enables the clock, effectively |
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* making clk_enable()/clk_disable() no-ops, false otherwise. |
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* |
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* This is of interest mainly to the power management code where actually |
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* disabling the clock also requires unpreparing it to have any material |
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* effect. |
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* |
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* Regardless of the value returned here, the caller must always invoke |
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* clk_enable() or clk_prepare_enable() and counterparts for usage counts |
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* to be right. |
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*/ |
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bool clk_is_enabled_when_prepared(struct clk *clk); |
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#else |
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static inline int clk_prepare(struct clk *clk) |
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{ |
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might_sleep(); |
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return 0; |
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} |
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static inline int __must_check |
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clk_bulk_prepare(int num_clks, const struct clk_bulk_data *clks) |
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{ |
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might_sleep(); |
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return 0; |
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} |
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static inline bool clk_is_enabled_when_prepared(struct clk *clk) |
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{ |
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return false; |
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} |
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#endif |
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/** |
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* clk_unprepare - undo preparation of a clock source |
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* @clk: clock source |
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* |
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* This undoes a previously prepared clock. The caller must balance |
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* the number of prepare and unprepare calls. |
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* |
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* Must not be called from within atomic context. |
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*/ |
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#ifdef CONFIG_HAVE_CLK_PREPARE |
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void clk_unprepare(struct clk *clk); |
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void clk_bulk_unprepare(int num_clks, const struct clk_bulk_data *clks); |
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#else |
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static inline void clk_unprepare(struct clk *clk) |
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{ |
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might_sleep(); |
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} |
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static inline void clk_bulk_unprepare(int num_clks, |
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const struct clk_bulk_data *clks) |
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{ |
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might_sleep(); |
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} |
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#endif |
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#ifdef CONFIG_HAVE_CLK |
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/** |
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* clk_get - lookup and obtain a reference to a clock producer. |
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* @dev: device for clock "consumer" |
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* @id: clock consumer ID |
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* |
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* Returns a struct clk corresponding to the clock producer, or |
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* valid IS_ERR() condition containing errno. The implementation |
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* uses @dev and @id to determine the clock consumer, and thereby |
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* the clock producer. (IOW, @id may be identical strings, but |
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* clk_get may return different clock producers depending on @dev.) |
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* |
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* Drivers must assume that the clock source is not enabled. |
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* |
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* clk_get should not be called from within interrupt context. |
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*/ |
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struct clk *clk_get(struct device *dev, const char *id); |
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/** |
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* clk_bulk_get - lookup and obtain a number of references to clock producer. |
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* @dev: device for clock "consumer" |
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* @num_clks: the number of clk_bulk_data |
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* @clks: the clk_bulk_data table of consumer |
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* |
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* This helper function allows drivers to get several clk consumers in one |
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* operation. If any of the clk cannot be acquired then any clks |
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* that were obtained will be freed before returning to the caller. |
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* |
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* Returns 0 if all clocks specified in clk_bulk_data table are obtained |
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* successfully, or valid IS_ERR() condition containing errno. |
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* The implementation uses @dev and @clk_bulk_data.id to determine the |
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* clock consumer, and thereby the clock producer. |
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* The clock returned is stored in each @clk_bulk_data.clk field. |
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* |
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* Drivers must assume that the clock source is not enabled. |
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* |
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* clk_bulk_get should not be called from within interrupt context. |
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*/ |
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int __must_check clk_bulk_get(struct device *dev, int num_clks, |
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struct clk_bulk_data *clks); |
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/** |
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* clk_bulk_get_all - lookup and obtain all available references to clock |
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* producer. |
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* @dev: device for clock "consumer" |
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* @clks: pointer to the clk_bulk_data table of consumer |
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* |
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* This helper function allows drivers to get all clk consumers in one |
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* operation. If any of the clk cannot be acquired then any clks |
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* that were obtained will be freed before returning to the caller. |
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* |
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* Returns a positive value for the number of clocks obtained while the |
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* clock references are stored in the clk_bulk_data table in @clks field. |
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* Returns 0 if there're none and a negative value if something failed. |
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* |
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* Drivers must assume that the clock source is not enabled. |
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* |
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* clk_bulk_get should not be called from within interrupt context. |
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*/ |
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int __must_check clk_bulk_get_all(struct device *dev, |
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struct clk_bulk_data **clks); |
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|
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/** |
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* clk_bulk_get_optional - lookup and obtain a number of references to clock producer |
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* @dev: device for clock "consumer" |
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* @num_clks: the number of clk_bulk_data |
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* @clks: the clk_bulk_data table of consumer |
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* |
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* Behaves the same as clk_bulk_get() except where there is no clock producer. |
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* In this case, instead of returning -ENOENT, the function returns 0 and |
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* NULL for a clk for which a clock producer could not be determined. |
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*/ |
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int __must_check clk_bulk_get_optional(struct device *dev, int num_clks, |
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struct clk_bulk_data *clks); |
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/** |
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* devm_clk_bulk_get - managed get multiple clk consumers |
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* @dev: device for clock "consumer" |
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* @num_clks: the number of clk_bulk_data |
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* @clks: the clk_bulk_data table of consumer |
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* |
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* Return 0 on success, an errno on failure. |
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* |
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* This helper function allows drivers to get several clk |
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* consumers in one operation with management, the clks will |
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* automatically be freed when the device is unbound. |
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*/ |
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int __must_check devm_clk_bulk_get(struct device *dev, int num_clks, |
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struct clk_bulk_data *clks); |
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/** |
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* devm_clk_bulk_get_optional - managed get multiple optional consumer clocks |
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* @dev: device for clock "consumer" |
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* @num_clks: the number of clk_bulk_data |
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* @clks: pointer to the clk_bulk_data table of consumer |
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* |
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* Behaves the same as devm_clk_bulk_get() except where there is no clock |
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* producer. In this case, instead of returning -ENOENT, the function returns |
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* NULL for given clk. It is assumed all clocks in clk_bulk_data are optional. |
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* |
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* Returns 0 if all clocks specified in clk_bulk_data table are obtained |
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* successfully or for any clk there was no clk provider available, otherwise |
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* returns valid IS_ERR() condition containing errno. |
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* The implementation uses @dev and @clk_bulk_data.id to determine the |
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* clock consumer, and thereby the clock producer. |
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* The clock returned is stored in each @clk_bulk_data.clk field. |
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* |
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* Drivers must assume that the clock source is not enabled. |
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* |
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* clk_bulk_get should not be called from within interrupt context. |
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*/ |
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int __must_check devm_clk_bulk_get_optional(struct device *dev, int num_clks, |
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struct clk_bulk_data *clks); |
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/** |
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* devm_clk_bulk_get_all - managed get multiple clk consumers |
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* @dev: device for clock "consumer" |
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* @clks: pointer to the clk_bulk_data table of consumer |
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* |
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* Returns a positive value for the number of clocks obtained while the |
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* clock references are stored in the clk_bulk_data table in @clks field. |
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* Returns 0 if there're none and a negative value if something failed. |
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* |
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* This helper function allows drivers to get several clk |
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* consumers in one operation with management, the clks will |
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* automatically be freed when the device is unbound. |
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*/ |
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int __must_check devm_clk_bulk_get_all(struct device *dev, |
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struct clk_bulk_data **clks); |
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|
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/** |
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* devm_clk_get - lookup and obtain a managed reference to a clock producer. |
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* @dev: device for clock "consumer" |
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* @id: clock consumer ID |
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* |
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* Context: May sleep. |
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* |
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* Return: a struct clk corresponding to the clock producer, or |
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* valid IS_ERR() condition containing errno. The implementation |
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* uses @dev and @id to determine the clock consumer, and thereby |
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* the clock producer. (IOW, @id may be identical strings, but |
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* clk_get may return different clock producers depending on @dev.) |
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* |
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* Drivers must assume that the clock source is neither prepared nor |
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* enabled. |
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* |
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* The clock will automatically be freed when the device is unbound |
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* from the bus. |
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*/ |
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struct clk *devm_clk_get(struct device *dev, const char *id); |
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|
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/** |
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* devm_clk_get_prepared - devm_clk_get() + clk_prepare() |
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* @dev: device for clock "consumer" |
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* @id: clock consumer ID |
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* |
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* Context: May sleep. |
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* |
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* Return: a struct clk corresponding to the clock producer, or |
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* valid IS_ERR() condition containing errno. The implementation |
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* uses @dev and @id to determine the clock consumer, and thereby |
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* the clock producer. (IOW, @id may be identical strings, but |
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* clk_get may return different clock producers depending on @dev.) |
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* |
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* The returned clk (if valid) is prepared. Drivers must however assume |
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* that the clock is not enabled. |
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* |
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* The clock will automatically be unprepared and freed when the device |
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* is unbound from the bus. |
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*/ |
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struct clk *devm_clk_get_prepared(struct device *dev, const char *id); |
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|
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/** |
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* devm_clk_get_enabled - devm_clk_get() + clk_prepare_enable() |
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* @dev: device for clock "consumer" |
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* @id: clock consumer ID |
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* |
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* Context: May sleep. |
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* |
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* Return: a struct clk corresponding to the clock producer, or |
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* valid IS_ERR() condition containing errno. The implementation |
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* uses @dev and @id to determine the clock consumer, and thereby |
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* the clock producer. (IOW, @id may be identical strings, but |
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* clk_get may return different clock producers depending on @dev.) |
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* |
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* The returned clk (if valid) is prepared and enabled. |
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* |
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* The clock will automatically be disabled, unprepared and freed |
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* when the device is unbound from the bus. |
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*/ |
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struct clk *devm_clk_get_enabled(struct device *dev, const char *id); |
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|
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/** |
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* devm_clk_get_optional - lookup and obtain a managed reference to an optional |
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* clock producer. |
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* @dev: device for clock "consumer" |
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* @id: clock consumer ID |
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* |
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* Context: May sleep. |
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* |
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* Return: a struct clk corresponding to the clock producer, or |
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* valid IS_ERR() condition containing errno. The implementation |
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* uses @dev and @id to determine the clock consumer, and thereby |
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* the clock producer. If no such clk is found, it returns NULL |
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* which serves as a dummy clk. That's the only difference compared |
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* to devm_clk_get(). |
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* |
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* Drivers must assume that the clock source is neither prepared nor |
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* enabled. |
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* |
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* The clock will automatically be freed when the device is unbound |
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* from the bus. |
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*/ |
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struct clk *devm_clk_get_optional(struct device *dev, const char *id); |
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|
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/** |
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* devm_clk_get_optional_prepared - devm_clk_get_optional() + clk_prepare() |
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* @dev: device for clock "consumer" |
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* @id: clock consumer ID |
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* |
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* Context: May sleep. |
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* |
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* Return: a struct clk corresponding to the clock producer, or |
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* valid IS_ERR() condition containing errno. The implementation |
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* uses @dev and @id to determine the clock consumer, and thereby |
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* the clock producer. If no such clk is found, it returns NULL |
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* which serves as a dummy clk. That's the only difference compared |
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* to devm_clk_get_prepared(). |
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* |
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* The returned clk (if valid) is prepared. Drivers must however |
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* assume that the clock is not enabled. |
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* |
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* The clock will automatically be unprepared and freed when the |
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* device is unbound from the bus. |
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*/ |
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struct clk *devm_clk_get_optional_prepared(struct device *dev, const char *id); |
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|
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/** |
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* devm_clk_get_optional_enabled - devm_clk_get_optional() + |
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* clk_prepare_enable() |
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* @dev: device for clock "consumer" |
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* @id: clock consumer ID |
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* |
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* Context: May sleep. |
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* |
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* Return: a struct clk corresponding to the clock producer, or |
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* valid IS_ERR() condition containing errno. The implementation |
|
* uses @dev and @id to determine the clock consumer, and thereby |
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* the clock producer. If no such clk is found, it returns NULL |
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* which serves as a dummy clk. That's the only difference compared |
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* to devm_clk_get_enabled(). |
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* |
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* The returned clk (if valid) is prepared and enabled. |
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* |
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* The clock will automatically be disabled, unprepared and freed |
|
* when the device is unbound from the bus. |
|
*/ |
|
struct clk *devm_clk_get_optional_enabled(struct device *dev, const char *id); |
|
|
|
/** |
|
* devm_get_clk_from_child - lookup and obtain a managed reference to a |
|
* clock producer from child node. |
|
* @dev: device for clock "consumer" |
|
* @np: pointer to clock consumer node |
|
* @con_id: clock consumer ID |
|
* |
|
* This function parses the clocks, and uses them to look up the |
|
* struct clk from the registered list of clock providers by using |
|
* @np and @con_id |
|
* |
|
* The clock will automatically be freed when the device is unbound |
|
* from the bus. |
|
*/ |
|
struct clk *devm_get_clk_from_child(struct device *dev, |
|
struct device_node *np, const char *con_id); |
|
/** |
|
* clk_rate_exclusive_get - get exclusivity over the rate control of a |
|
* producer |
|
* @clk: clock source |
|
* |
|
* This function allows drivers to get exclusive control over the rate of a |
|
* provider. It prevents any other consumer to execute, even indirectly, |
|
* opereation which could alter the rate of the provider or cause glitches |
|
* |
|
* If exlusivity is claimed more than once on clock, even by the same driver, |
|
* the rate effectively gets locked as exclusivity can't be preempted. |
|
* |
|
* Must not be called from within atomic context. |
|
* |
|
* Returns success (0) or negative errno. |
|
*/ |
|
int clk_rate_exclusive_get(struct clk *clk); |
|
|
|
/** |
|
* clk_rate_exclusive_put - release exclusivity over the rate control of a |
|
* producer |
|
* @clk: clock source |
|
* |
|
* This function allows drivers to release the exclusivity it previously got |
|
* from clk_rate_exclusive_get() |
|
* |
|
* The caller must balance the number of clk_rate_exclusive_get() and |
|
* clk_rate_exclusive_put() calls. |
|
* |
|
* Must not be called from within atomic context. |
|
*/ |
|
void clk_rate_exclusive_put(struct clk *clk); |
|
|
|
/** |
|
* clk_enable - inform the system when the clock source should be running. |
|
* @clk: clock source |
|
* |
|
* If the clock can not be enabled/disabled, this should return success. |
|
* |
|
* May be called from atomic contexts. |
|
* |
|
* Returns success (0) or negative errno. |
|
*/ |
|
int clk_enable(struct clk *clk); |
|
|
|
/** |
|
* clk_bulk_enable - inform the system when the set of clks should be running. |
|
* @num_clks: the number of clk_bulk_data |
|
* @clks: the clk_bulk_data table of consumer |
|
* |
|
* May be called from atomic contexts. |
|
* |
|
* Returns success (0) or negative errno. |
|
*/ |
|
int __must_check clk_bulk_enable(int num_clks, |
|
const struct clk_bulk_data *clks); |
|
|
|
/** |
|
* clk_disable - inform the system when the clock source is no longer required. |
|
* @clk: clock source |
|
* |
|
* Inform the system that a clock source is no longer required by |
|
* a driver and may be shut down. |
|
* |
|
* May be called from atomic contexts. |
|
* |
|
* Implementation detail: if the clock source is shared between |
|
* multiple drivers, clk_enable() calls must be balanced by the |
|
* same number of clk_disable() calls for the clock source to be |
|
* disabled. |
|
*/ |
|
void clk_disable(struct clk *clk); |
|
|
|
/** |
|
* clk_bulk_disable - inform the system when the set of clks is no |
|
* longer required. |
|
* @num_clks: the number of clk_bulk_data |
|
* @clks: the clk_bulk_data table of consumer |
|
* |
|
* Inform the system that a set of clks is no longer required by |
|
* a driver and may be shut down. |
|
* |
|
* May be called from atomic contexts. |
|
* |
|
* Implementation detail: if the set of clks is shared between |
|
* multiple drivers, clk_bulk_enable() calls must be balanced by the |
|
* same number of clk_bulk_disable() calls for the clock source to be |
|
* disabled. |
|
*/ |
|
void clk_bulk_disable(int num_clks, const struct clk_bulk_data *clks); |
|
|
|
/** |
|
* clk_get_rate - obtain the current clock rate (in Hz) for a clock source. |
|
* This is only valid once the clock source has been enabled. |
|
* @clk: clock source |
|
*/ |
|
unsigned long clk_get_rate(struct clk *clk); |
|
|
|
/** |
|
* clk_put - "free" the clock source |
|
* @clk: clock source |
|
* |
|
* Note: drivers must ensure that all clk_enable calls made on this |
|
* clock source are balanced by clk_disable calls prior to calling |
|
* this function. |
|
* |
|
* clk_put should not be called from within interrupt context. |
|
*/ |
|
void clk_put(struct clk *clk); |
|
|
|
/** |
|
* clk_bulk_put - "free" the clock source |
|
* @num_clks: the number of clk_bulk_data |
|
* @clks: the clk_bulk_data table of consumer |
|
* |
|
* Note: drivers must ensure that all clk_bulk_enable calls made on this |
|
* clock source are balanced by clk_bulk_disable calls prior to calling |
|
* this function. |
|
* |
|
* clk_bulk_put should not be called from within interrupt context. |
|
*/ |
|
void clk_bulk_put(int num_clks, struct clk_bulk_data *clks); |
|
|
|
/** |
|
* clk_bulk_put_all - "free" all the clock source |
|
* @num_clks: the number of clk_bulk_data |
|
* @clks: the clk_bulk_data table of consumer |
|
* |
|
* Note: drivers must ensure that all clk_bulk_enable calls made on this |
|
* clock source are balanced by clk_bulk_disable calls prior to calling |
|
* this function. |
|
* |
|
* clk_bulk_put_all should not be called from within interrupt context. |
|
*/ |
|
void clk_bulk_put_all(int num_clks, struct clk_bulk_data *clks); |
|
|
|
/** |
|
* devm_clk_put - "free" a managed clock source |
|
* @dev: device used to acquire the clock |
|
* @clk: clock source acquired with devm_clk_get() |
|
* |
|
* Note: drivers must ensure that all clk_enable calls made on this |
|
* clock source are balanced by clk_disable calls prior to calling |
|
* this function. |
|
* |
|
* clk_put should not be called from within interrupt context. |
|
*/ |
|
void devm_clk_put(struct device *dev, struct clk *clk); |
|
|
|
/* |
|
* The remaining APIs are optional for machine class support. |
|
*/ |
|
|
|
|
|
/** |
|
* clk_round_rate - adjust a rate to the exact rate a clock can provide |
|
* @clk: clock source |
|
* @rate: desired clock rate in Hz |
|
* |
|
* This answers the question "if I were to pass @rate to clk_set_rate(), |
|
* what clock rate would I end up with?" without changing the hardware |
|
* in any way. In other words: |
|
* |
|
* rate = clk_round_rate(clk, r); |
|
* |
|
* and: |
|
* |
|
* clk_set_rate(clk, r); |
|
* rate = clk_get_rate(clk); |
|
* |
|
* are equivalent except the former does not modify the clock hardware |
|
* in any way. |
|
* |
|
* Returns rounded clock rate in Hz, or negative errno. |
|
*/ |
|
long clk_round_rate(struct clk *clk, unsigned long rate); |
|
|
|
/** |
|
* clk_set_rate - set the clock rate for a clock source |
|
* @clk: clock source |
|
* @rate: desired clock rate in Hz |
|
* |
|
* Updating the rate starts at the top-most affected clock and then |
|
* walks the tree down to the bottom-most clock that needs updating. |
|
* |
|
* Returns success (0) or negative errno. |
|
*/ |
|
int clk_set_rate(struct clk *clk, unsigned long rate); |
|
|
|
/** |
|
* clk_set_rate_exclusive- set the clock rate and claim exclusivity over |
|
* clock source |
|
* @clk: clock source |
|
* @rate: desired clock rate in Hz |
|
* |
|
* This helper function allows drivers to atomically set the rate of a producer |
|
* and claim exclusivity over the rate control of the producer. |
|
* |
|
* It is essentially a combination of clk_set_rate() and |
|
* clk_rate_exclusite_get(). Caller must balance this call with a call to |
|
* clk_rate_exclusive_put() |
|
* |
|
* Returns success (0) or negative errno. |
|
*/ |
|
int clk_set_rate_exclusive(struct clk *clk, unsigned long rate); |
|
|
|
/** |
|
* clk_has_parent - check if a clock is a possible parent for another |
|
* @clk: clock source |
|
* @parent: parent clock source |
|
* |
|
* This function can be used in drivers that need to check that a clock can be |
|
* the parent of another without actually changing the parent. |
|
* |
|
* Returns true if @parent is a possible parent for @clk, false otherwise. |
|
*/ |
|
bool clk_has_parent(struct clk *clk, struct clk *parent); |
|
|
|
/** |
|
* clk_set_rate_range - set a rate range for a clock source |
|
* @clk: clock source |
|
* @min: desired minimum clock rate in Hz, inclusive |
|
* @max: desired maximum clock rate in Hz, inclusive |
|
* |
|
* Returns success (0) or negative errno. |
|
*/ |
|
int clk_set_rate_range(struct clk *clk, unsigned long min, unsigned long max); |
|
|
|
/** |
|
* clk_get_rate_range - returns the clock rate range for a clock source |
|
* @clk: clock source |
|
* @min: Pointer to the variable that will hold the minimum |
|
* @max: Pointer to the variable that will hold the maximum |
|
* |
|
* Fills the @min and @max variables with the minimum and maximum that |
|
* the clock source can reach. |
|
*/ |
|
void clk_get_rate_range(struct clk *clk, unsigned long *min, unsigned long *max); |
|
|
|
/** |
|
* clk_set_min_rate - set a minimum clock rate for a clock source |
|
* @clk: clock source |
|
* @rate: desired minimum clock rate in Hz, inclusive |
|
* |
|
* Returns success (0) or negative errno. |
|
*/ |
|
int clk_set_min_rate(struct clk *clk, unsigned long rate); |
|
|
|
/** |
|
* clk_set_max_rate - set a maximum clock rate for a clock source |
|
* @clk: clock source |
|
* @rate: desired maximum clock rate in Hz, inclusive |
|
* |
|
* Returns success (0) or negative errno. |
|
*/ |
|
int clk_set_max_rate(struct clk *clk, unsigned long rate); |
|
|
|
/** |
|
* clk_set_parent - set the parent clock source for this clock |
|
* @clk: clock source |
|
* @parent: parent clock source |
|
* |
|
* Returns success (0) or negative errno. |
|
*/ |
|
int clk_set_parent(struct clk *clk, struct clk *parent); |
|
|
|
/** |
|
* clk_get_parent - get the parent clock source for this clock |
|
* @clk: clock source |
|
* |
|
* Returns struct clk corresponding to parent clock source, a NULL |
|
* pointer if it doesn't have a parent, or a valid IS_ERR() condition |
|
* containing errno. |
|
*/ |
|
struct clk *clk_get_parent(struct clk *clk); |
|
|
|
/** |
|
* clk_get_sys - get a clock based upon the device name |
|
* @dev_id: device name |
|
* @con_id: connection ID |
|
* |
|
* Returns a struct clk corresponding to the clock producer, or |
|
* valid IS_ERR() condition containing errno. The implementation |
|
* uses @dev_id and @con_id to determine the clock consumer, and |
|
* thereby the clock producer. In contrast to clk_get() this function |
|
* takes the device name instead of the device itself for identification. |
|
* |
|
* Drivers must assume that the clock source is not enabled. |
|
* |
|
* clk_get_sys should not be called from within interrupt context. |
|
*/ |
|
struct clk *clk_get_sys(const char *dev_id, const char *con_id); |
|
|
|
/** |
|
* clk_save_context - save clock context for poweroff |
|
* |
|
* Saves the context of the clock register for powerstates in which the |
|
* contents of the registers will be lost. Occurs deep within the suspend |
|
* code so locking is not necessary. |
|
*/ |
|
int clk_save_context(void); |
|
|
|
/** |
|
* clk_restore_context - restore clock context after poweroff |
|
* |
|
* This occurs with all clocks enabled. Occurs deep within the resume code |
|
* so locking is not necessary. |
|
*/ |
|
void clk_restore_context(void); |
|
|
|
#else /* !CONFIG_HAVE_CLK */ |
|
|
|
static inline struct clk *clk_get(struct device *dev, const char *id) |
|
{ |
|
return NULL; |
|
} |
|
|
|
static inline int __must_check clk_bulk_get(struct device *dev, int num_clks, |
|
struct clk_bulk_data *clks) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline int __must_check clk_bulk_get_optional(struct device *dev, |
|
int num_clks, struct clk_bulk_data *clks) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline int __must_check clk_bulk_get_all(struct device *dev, |
|
struct clk_bulk_data **clks) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline struct clk *devm_clk_get(struct device *dev, const char *id) |
|
{ |
|
return NULL; |
|
} |
|
|
|
static inline struct clk *devm_clk_get_prepared(struct device *dev, |
|
const char *id) |
|
{ |
|
return NULL; |
|
} |
|
|
|
static inline struct clk *devm_clk_get_enabled(struct device *dev, |
|
const char *id) |
|
{ |
|
return NULL; |
|
} |
|
|
|
static inline struct clk *devm_clk_get_optional(struct device *dev, |
|
const char *id) |
|
{ |
|
return NULL; |
|
} |
|
|
|
static inline struct clk *devm_clk_get_optional_prepared(struct device *dev, |
|
const char *id) |
|
{ |
|
return NULL; |
|
} |
|
|
|
static inline struct clk *devm_clk_get_optional_enabled(struct device *dev, |
|
const char *id) |
|
{ |
|
return NULL; |
|
} |
|
|
|
static inline int __must_check devm_clk_bulk_get(struct device *dev, int num_clks, |
|
struct clk_bulk_data *clks) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline int __must_check devm_clk_bulk_get_optional(struct device *dev, |
|
int num_clks, struct clk_bulk_data *clks) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline int __must_check devm_clk_bulk_get_all(struct device *dev, |
|
struct clk_bulk_data **clks) |
|
{ |
|
|
|
return 0; |
|
} |
|
|
|
static inline struct clk *devm_get_clk_from_child(struct device *dev, |
|
struct device_node *np, const char *con_id) |
|
{ |
|
return NULL; |
|
} |
|
|
|
static inline void clk_put(struct clk *clk) {} |
|
|
|
static inline void clk_bulk_put(int num_clks, struct clk_bulk_data *clks) {} |
|
|
|
static inline void clk_bulk_put_all(int num_clks, struct clk_bulk_data *clks) {} |
|
|
|
static inline void devm_clk_put(struct device *dev, struct clk *clk) {} |
|
|
|
|
|
static inline int clk_rate_exclusive_get(struct clk *clk) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline void clk_rate_exclusive_put(struct clk *clk) {} |
|
|
|
static inline int clk_enable(struct clk *clk) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline int __must_check clk_bulk_enable(int num_clks, |
|
const struct clk_bulk_data *clks) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline void clk_disable(struct clk *clk) {} |
|
|
|
|
|
static inline void clk_bulk_disable(int num_clks, |
|
const struct clk_bulk_data *clks) {} |
|
|
|
static inline unsigned long clk_get_rate(struct clk *clk) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline int clk_set_rate(struct clk *clk, unsigned long rate) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline int clk_set_rate_exclusive(struct clk *clk, unsigned long rate) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline long clk_round_rate(struct clk *clk, unsigned long rate) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline bool clk_has_parent(struct clk *clk, struct clk *parent) |
|
{ |
|
return true; |
|
} |
|
|
|
static inline int clk_set_rate_range(struct clk *clk, unsigned long min, |
|
unsigned long max) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline void clk_get_rate_range(struct clk *clk, unsigned long *min, |
|
unsigned long *max) |
|
{ |
|
if (!min || !max) |
|
return; |
|
|
|
*min = 0; |
|
*max = ULONG_MAX; |
|
} |
|
|
|
static inline int clk_set_min_rate(struct clk *clk, unsigned long rate) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline int clk_set_max_rate(struct clk *clk, unsigned long rate) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline int clk_set_parent(struct clk *clk, struct clk *parent) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline struct clk *clk_get_parent(struct clk *clk) |
|
{ |
|
return NULL; |
|
} |
|
|
|
static inline struct clk *clk_get_sys(const char *dev_id, const char *con_id) |
|
{ |
|
return NULL; |
|
} |
|
|
|
static inline int clk_save_context(void) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline void clk_restore_context(void) {} |
|
|
|
#endif |
|
|
|
/* clk_prepare_enable helps cases using clk_enable in non-atomic context. */ |
|
static inline int clk_prepare_enable(struct clk *clk) |
|
{ |
|
int ret; |
|
|
|
ret = clk_prepare(clk); |
|
if (ret) |
|
return ret; |
|
ret = clk_enable(clk); |
|
if (ret) |
|
clk_unprepare(clk); |
|
|
|
return ret; |
|
} |
|
|
|
/* clk_disable_unprepare helps cases using clk_disable in non-atomic context. */ |
|
static inline void clk_disable_unprepare(struct clk *clk) |
|
{ |
|
clk_disable(clk); |
|
clk_unprepare(clk); |
|
} |
|
|
|
static inline int __must_check |
|
clk_bulk_prepare_enable(int num_clks, const struct clk_bulk_data *clks) |
|
{ |
|
int ret; |
|
|
|
ret = clk_bulk_prepare(num_clks, clks); |
|
if (ret) |
|
return ret; |
|
ret = clk_bulk_enable(num_clks, clks); |
|
if (ret) |
|
clk_bulk_unprepare(num_clks, clks); |
|
|
|
return ret; |
|
} |
|
|
|
static inline void clk_bulk_disable_unprepare(int num_clks, |
|
const struct clk_bulk_data *clks) |
|
{ |
|
clk_bulk_disable(num_clks, clks); |
|
clk_bulk_unprepare(num_clks, clks); |
|
} |
|
|
|
/** |
|
* clk_drop_range - Reset any range set on that clock |
|
* @clk: clock source |
|
* |
|
* Returns success (0) or negative errno. |
|
*/ |
|
static inline int clk_drop_range(struct clk *clk) |
|
{ |
|
return clk_set_rate_range(clk, 0, ULONG_MAX); |
|
} |
|
|
|
/** |
|
* clk_get_min_rate - returns the minimum clock rate for a clock source |
|
* @clk: clock source |
|
* |
|
* Returns either the minimum clock rate in Hz that clock source can |
|
* reach, or 0 on error. |
|
*/ |
|
static inline unsigned long clk_get_min_rate(struct clk *clk) |
|
{ |
|
unsigned long min, max; |
|
|
|
if (!clk) |
|
return 0; |
|
|
|
clk_get_rate_range(clk, &min, &max); |
|
|
|
return min; |
|
} |
|
|
|
/** |
|
* clk_get_max_rate - returns the maximum clock rate for a clock source |
|
* @clk: clock source |
|
* |
|
* Returns either the maximum clock rate in Hz that clock source can |
|
* reach, or 0 on error. |
|
*/ |
|
static inline unsigned long clk_get_max_rate(struct clk *clk) |
|
{ |
|
unsigned long min, max; |
|
|
|
if (!clk) |
|
return 0; |
|
|
|
clk_get_rate_range(clk, &min, &max); |
|
|
|
return max; |
|
} |
|
|
|
/** |
|
* clk_get_optional - lookup and obtain a reference to an optional clock |
|
* producer. |
|
* @dev: device for clock "consumer" |
|
* @id: clock consumer ID |
|
* |
|
* Behaves the same as clk_get() except where there is no clock producer. In |
|
* this case, instead of returning -ENOENT, the function returns NULL. |
|
*/ |
|
static inline struct clk *clk_get_optional(struct device *dev, const char *id) |
|
{ |
|
struct clk *clk = clk_get(dev, id); |
|
|
|
if (clk == ERR_PTR(-ENOENT)) |
|
return NULL; |
|
|
|
return clk; |
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} |
|
|
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#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK) |
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struct clk *of_clk_get(struct device_node *np, int index); |
|
struct clk *of_clk_get_by_name(struct device_node *np, const char *name); |
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struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec); |
|
#else |
|
static inline struct clk *of_clk_get(struct device_node *np, int index) |
|
{ |
|
return ERR_PTR(-ENOENT); |
|
} |
|
static inline struct clk *of_clk_get_by_name(struct device_node *np, |
|
const char *name) |
|
{ |
|
return ERR_PTR(-ENOENT); |
|
} |
|
static inline struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec) |
|
{ |
|
return ERR_PTR(-ENOENT); |
|
} |
|
#endif |
|
|
|
#endif
|
|
|