Merge branch 'timers-for-linus-urgent' of git://git.kernel.org/pub/scm/linux/kernel...

[firefly-linux-kernel-4.4.55.git] / include / linux / clocksource.h

diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 95e4995d99879f921b3f287ffae429671f9bba4d..8a4a130cc19698ab8a03c6c6344e3b24f42932f8 100644 (file)
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -151,6 +151,7 @@ extern u64 timecounter_cyc2time(struct timecounter *tc,
  *                     subtraction of non 64 bit counters
  * @mult:              cycle to nanosecond multiplier
  * @shift:             cycle to nanosecond divisor (power of two)
+ * @max_idle_ns:       max idle time permitted by the clocksource (nsecs)
  * @flags:             flags describing special properties
  * @vread:             vsyscall based read
  * @resume:            resume function for the clocksource, if necessary
@@ -168,6 +169,7 @@ struct clocksource {
        cycle_t mask;
        u32 mult;
        u32 shift;
+       u64 max_idle_ns;
        unsigned long flags;
        cycle_t (*vread)(void);
        void (*resume)(void);
@@ -279,6 +281,16 @@ extern void clocksource_resume(void);
 extern struct clocksource * __init __weak clocksource_default_clock(void);
 extern void clocksource_mark_unstable(struct clocksource *cs);
 
+extern void
+clocks_calc_mult_shift(u32 *mult, u32 *shift, u32 from, u32 to, u32 minsec);
+
+static inline void
+clocksource_calc_mult_shift(struct clocksource *cs, u32 freq, u32 minsec)
+{
+       return clocks_calc_mult_shift(&cs->mult, &cs->shift, freq,
+                                     NSEC_PER_SEC, minsec);
+}
+
 #ifdef CONFIG_GENERIC_TIME_VSYSCALL
 extern void
 update_vsyscall(struct timespec *ts, struct clocksource *c, u32 mult);