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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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7
drivers/timer/hpet.c
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@ -589,7 +589,7 @@ int _sys_clock_driver_init(struct device *device)
/*
* This driver shall read the COUNTER_CLK_PERIOD value from the general
* capabilities register rather than rely on a board.h provide macro
* (or the global variable 'sys_clock_hw_cycles_per_tick')
* (or the global variable 'sys_clock_hw_cycles_per_tick()')
* to determine the frequency of clock applied to the HPET device.
*/
@ -611,10 +611,9 @@ int _sys_clock_driver_init(struct device *device)
DBG("HPET: timer0: available interrupts mask 0x%x\n",
(u32_t)(*_HPET_TIMER0_CONFIG_CAPS >> 32));
/* Initialize sys_clock_hw_cycles_per_tick/sec */
/* Initialize sys_clock_hw_cycles_per_sec */
sys_clock_hw_cycles_per_tick = counter_load_value;
z_clock_hw_cycles_per_sec = sys_clock_hw_cycles_per_tick *
z_clock_hw_cycles_per_sec = counter_load_value *
CONFIG_SYS_CLOCK_TICKS_PER_SEC;