ARM: vf610: Add ARM Global Timer clocksource option

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>

1 files changed, 20 insertions, 1 deletions

diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 11b2957f792b..e26b0fdd72db 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -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"