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1825f9534c
Previous adjtime() implementation was limited to adjusting system timer tick period. This commit reimplements the internals to use a kernel watchdog timer. Platform-independent part of the code now works also for adjusting hires RTC and tickless timer rate. User code facing API is unchanged. Architecture code API has changed: up_adj_timer_period() is replaced by up_adjtime(). Other improvements: - Support query of remaining adjustment by passing NULL to first argument of adjtime(). This matches Linux behavior. - Improve resolution available for architecture driver, previously limited to 1 microsecond per tick. Now 1 nanosecond per second.