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drivers/xtensa_sys_timer: Change default timer ID

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Use index zero, not one.  The Xtensa tools emit the timers in priority
order, and as mentioned in the kconfig warnings using high priority
timers doesn't work.  This also makes room for using software
interrupts that can preempt a timer interrupt for test purposes.

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This commit is contained in:
Andy Ross 2022-02-14 15:54:46 -08:00 committed by Anas Nashif
parent ac6060f966
commit 066e4da281
1 changed files with 3 additions and 4 deletions
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7
drivers/timer/Kconfig.xtensa
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@ -14,13 +14,12 @@ config XTENSA_TIMER
config XTENSA_TIMER_ID
int "System timer CCOMPAREn register index"
default 1
default 0
depends on XTENSA_TIMER
help
Index of the CCOMPARE register (and associated interrupt)
used for the system timer. Xtensa CPUs have hard-configured
interrupt priorities associated with each timer, and some of
them can be unmaskable (and thus not usable by OS code that
need synchronization, like the timer subsystem!). Choose
carefully. Generally you want the timer with the highest
priority maskable interrupt.
need synchronization, like the timer subsystem!). In
general timer zero is guaranteed to be present and usable.