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sys_clock: add option for setting timer frequency at runtime

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Some timer devices, such as the HPET, read their frequencies at runtime.
All global constant values must be set at runtime in that case.

Change-Id: I408babce6deb857748a87691132d7e27e88f0bb8
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
This commit is contained in:
Benjamin Walsh 2015-11-20 16:26:25 -05:00 • committed by Anas Nashif
commit fde6458f0b
3 changed files with 18 additions and 1 deletions
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5
include/sys_clock.h
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@ -35,7 +35,12 @@
#endif
#define sys_clock_ticks_per_sec CONFIG_SYS_CLOCK_TICKS_PER_SEC
#if defined(CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME)
extern int sys_clock_hw_cycles_per_sec;
#else
#define sys_clock_hw_cycles_per_sec CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC
#endif
/*
* sys_clock_us_per_tick global variable represents a number