Am 2014-09-29 13:51, schrieb Shawn Guo: > On Wed, Sep 24, 2014 at 06:20:10PM +0200, Stefan Agner wrote: >> 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 <ste...@agner.ch> >> --- >> arch/arm/mach-imx/Kconfig | 19 ++++++++++++++++++- >> 1 file changed, 18 insertions(+), 1 deletion(-) >> >> diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig >> index 11b2957..9482f58 100644 >> --- a/arch/arm/mach-imx/Kconfig >> +++ b/arch/arm/mach-imx/Kconfig >> @@ -633,12 +633,29 @@ 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 ARM_GLOBAL_TIMER >> + >> + config ARM_GLOBAL_TIMER >> + bool "Use ARM Global Timer" >> + select CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK >> + help >> + Use the ARM Global Timer as clocksource >> + >> + config VF_PIT_TIMER >> + bool "Use PIT timer" >> + help >> + Use SoC Periodic Interrupt Timer (PIT) as clocksource >> + >> +endchoice >> + > > As per the report from 0-DAY kernel build test (thanks), the change > causes the following warning on a particular config. > > warning: (ARCH_ROCKCHIP && ARCH_BCM_5301X) selects > CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK which has unmet direct > dependencies (ARM_GLOBAL_TIMER) > > It looks the redefinition of ARM_GLOBAL_TIMER is the cause for that > warning. I think it's more safer to use new config symbols for choosing > the clocksource device for VF610. I propose the following change to fix > the warning. If there is no objection, I will squash it into the > original commit soon. > > diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig > index 9482f5837b7e..e26b0fdd72db 100644 > --- a/arch/arm/mach-imx/Kconfig > +++ b/arch/arm/mach-imx/Kconfig > @@ -641,16 +641,18 @@ config SOC_VF610 > choice > prompt "Clocksource for scheduler clock" > depends on SOC_VF610 > - default ARM_GLOBAL_TIMER > + default VF_USE_ARM_GLOBAL_TIMER > > - config 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_PIT_TIMER > + config VF_USE_PIT_TIMER > bool "Use PIT timer" > + select VF_PIT_TIMER > help > Use SoC Periodic Interrupt Timer (PIT) as clocksource
I thought that Kconfig actually allowed to define a config symbol twice. But maybe this is not a good idea with dependencies (depends on SOC_VF610 on the choice level...?). Thx Shawn, sorry about that. Acked-by: Stefan Agner <ste...@agner.ch> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
