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ARM: vf610: Add ARM Global Timer clocksource option

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Add the ARM Global Timer as clocksource/scheduler clock option and
use it as default scheduler clock. This leaves the PIT timer for
other users e.g. the secondary Cortex-M4 core. Also, the Global Timer
has double the precission (running at pheripheral clock compared to
IPG clock) and a 64-bit incrementing counter register. We still keep
the PIT timer as an secondary option in case the ARM Global Timer is
not available.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Acked-by: Bill Pringlemeir <bpringlemeir@nbsps.com>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
This commit is contained in:
Stefan Agner 2014-09-24 18:20:10 +02:00 committed by Shawn Guo
parent bc4abc3e5f
commit 2a61cba71f
1 changed files with 20 additions and 1 deletions
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21
arch/arm/mach-imx/Kconfig
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@ -633,12 +633,31 @@ config SOC_VF610
bool "Vybrid Family VF610 support"
select ARM_GIC
select PINCTRL_VF610
select VF_PIT_TIMER
select PL310_ERRATA_769419 if CACHE_L2X0
help
This enable support for Freescale Vybrid VF610 processor.
choice
prompt "Clocksource for scheduler clock"
depends on SOC_VF610
default VF_USE_ARM_GLOBAL_TIMER
config VF_USE_ARM_GLOBAL_TIMER
bool "Use ARM Global Timer"
select ARM_GLOBAL_TIMER
select CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK
help
Use the ARM Global Timer as clocksource
config VF_USE_PIT_TIMER
bool "Use PIT timer"
select VF_PIT_TIMER
help
Use SoC Periodic Interrupt Timer (PIT) as clocksource
endchoice
endif
source "arch/arm/mach-imx/devices/Kconfig"