include/hw/clock.h

32     ClockUpdate = 1, /* Clock period has just updated */
33     ClockPreUpdate = 2, /* Clock period is about to update */
39  * clock store a value representing the clock's period in 2^-32ns unit.
60  * @period: unsigned integer representing the period of the clock
78     uint64_t period;  member
157  * Setup @src as the clock source of @clk. The current @src period
184  * Set the local cached period value of @clk to @value.
204  * Propagate the clock period that has been previously configured using
242  * @return: the current period.
246     return clk->period;  in clock_get()
260  * to tick @ticks times. Because a clock can have a period
263  * expiry deadlines, rather than attempting to obtain a "period
268  * value if the number of ticks and the clock period are both
280      * clk->period is the period in units of 2^-32 ns, so  in clock_ticks_to_ns()
281      * (clk->period * ticks) is the required length of time in those  in clock_ticks_to_ns()
286     mulu64(&ns_low, &ns_high, clk->period, ticks);  in clock_ticks_to_ns()
299  * number of nanoseconds. Because a clock can have a period which
301  * function rather than attempting to obtain a "period in nanoseconds"
304  * If the clock is stopped (ie it has period zero), returns 0.
307  * the clock's period is short and the duration is long). In these
317      *       = ns / (period / 2^32)  in clock_ns_to_ticks()
318      *       = (ns * 2^32) / period  in clock_ns_to_ticks()
323     if (clk->period == 0) {  in clock_ns_to_ticks()
327     divu128(&lo, &hi, clk->period);  in clock_ns_to_ticks()
362  * By default, a Clock's children will all run with the same period
366  * will run child clocks with a period 2/3 of the parent clock,
373  * Setting a multiplier value that results in the child period