[PATCH 2/2] ARM: vf610: Use ARM Global Timer as clocksource
From: Shawn Guo <hidden>
Date: 2014-09-25 07:51:24
Also in:
lkml
On Thu, Sep 11, 2014 at 02:06:15PM +0200, Stefan Agner wrote:
Use ARM Global Timer as clocksource instead of the PIT timer. 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.
I just think of one thing. Will this change cause a problem of the low power idle support in case we want to power down ARM core in there? Shawn
quoted hunk ↗ jump to hunk
Signed-off-by: Stefan Agner <stefan@agner.ch> --- Theoretically we could remove the PIT driver now. But we could also enable both drivers, but is having two clock source useful for the Kernel at all? arch/arm/mach-imx/Kconfig | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig index 64161aa..adc77180 100644 --- a/arch/arm/mach-imx/Kconfig +++ b/arch/arm/mach-imx/Kconfig@@ -656,7 +656,8 @@ config SOC_VF610 bool "Vybrid Family VF610 support" select ARM_GIC select PINCTRL_VF610 - select VF_PIT_TIMER + select ARM_GLOBAL_TIMER + select CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK select PL310_ERRATA_769419 if CACHE_L2X0 help-- 2.1.0