include/linux/clk.h

24  * struct clk - an machine class defined object / cookie.
29  * clk_get - lookup and obtain a reference to a clock producer.
30  * @dev: device for clock "consumer"
31  * @id: clock comsumer ID
33  * Returns a struct clk corresponding to the clock producer, or
35  * uses @dev and @id to determine the clock consumer, and thereby
36  * the clock producer.  (IOW, @id may be identical strings, but
37  * clk_get may return different clock producers depending on @dev.)
39  * Drivers must assume that the clock source is not enabled.
46  * clk_prepare - prepare a clock source
47  * @clk: clock source
49  * This prepares the clock source for use.
64  * clk_enable - inform the system when the clock source should be running.
65  * @clk: clock source
67  * If the clock can not be enabled/disabled, this should return success.
76  * clk_disable - inform the system when the clock source is no longer required.
77  * @clk: clock source
79  * Inform the system that a clock source is no longer required by
84  * Implementation detail: if the clock source is shared between
86  * same number of clk_disable() calls for the clock source to be
93  * clk_unprepare - undo preparation of a clock source
94  * @clk: clock source
96  * This undoes a previously prepared clock.  The caller must balance
110 /* clk_prepare_enable helps cases using clk_enable in non-atomic context. */
125 /* clk_disable_unprepare helps cases using clk_disable in non-atomic context. */
133  * clk_get_rate - obtain the current clock rate (in Hz) for a clock source.
134  *		  This is only valid once the clock source has been enabled.
135  * @clk: clock source
140  * clk_put	- "free" the clock source
141  * @clk: clock source
144  * clock source are balanced by clk_disable calls prior to calling
158  * clk_round_rate - adjust a rate to the exact rate a clock can provide
159  * @clk: clock source
160  * @rate: desired clock rate in Hz
162  * Returns rounded clock rate in Hz, or negative errno.
167  * clk_set_rate - set the clock rate for a clock source
168  * @clk: clock source
169  * @rate: desired clock rate in Hz
176  * clk_set_parent - set the parent clock source for this clock
177  * @clk: clock source
178  * @parent: parent clock source
185  * clk_get_parent - get the parent clock source for this clock
186  * @clk: clock source
188  * Returns struct clk corresponding to parent clock source, or
194  * clk_get_sys - get a clock based upon the device name
198  * Returns a struct clk corresponding to the clock producer, or
200  * uses @dev_id and @con_id to determine the clock consumer, and
201  * thereby the clock producer. In contrast to clk_get() this function
204  * Drivers must assume that the clock source is not enabled.
211  * clk_add_alias - add a new clock alias
212  * @alias: name for clock alias
214  * @id: platform specific clock name
217  * Allows using generic clock names for drivers by adding a new alias.