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sys_clock: Make sys_clock_hw_cycles_per_tick() a proper API

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This was another "global variable" API.  Give it function syntax too.
Also add a warning, because on nRF devices (at least) the cycle clock
runs in kHz and is too slow to give a precise answer here.

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This commit is contained in:
Andy Ross 2018-09-19 11:33:07 -07:00 • committed by Anas Nashif
commit b2e4283555
15 changed files with 59 additions and 66 deletions
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2
drivers/timer/arcv2_timer0.c
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@ -487,7 +487,7 @@ int _sys_clock_driver_init(struct device *device)
timer0_control_register_set(0);
timer0_count_register_set(0);
cycles_per_tick = sys_clock_hw_cycles_per_tick;
cycles_per_tick = sys_clock_hw_cycles_per_tick();
IRQ_CONNECT(IRQ_TIMER0, CONFIG_ARCV2_TIMER_IRQ_PRIORITY,
_timer_int_handler, NULL, 0);