* Lokesh Vutla <lokeshvutla@xxxxxx> [140207 02:24]: > From: Rajendra Nayak <rnayak@xxxxxx> > > The SyncTimer in AM43x is clocked using the following two sources: > 1) An inaccuarte 32k clock (CLK_32KHZ) derived from PER DPLL, causing system > time to go slowly (~10% deviation). > 2) external 32KHz RTC clock, which may not always be available on board like > in the case of ePOS EVM > > Use gptimer as clocksource instead, as is done in the case of AM335x > (which does not have a SyncTimer). With this, system time keeping works > accurately. Hmm doesn't this also mean that PM for any deeper idle states won't work properly? Regards, Tony > Signed-off-by: Rajendra Nayak <rnayak@xxxxxx> > Signed-off-by: Lokesh Vutla <lokeshvutla@xxxxxx> > --- > arch/arm/mach-omap2/board-generic.c | 2 +- > arch/arm/mach-omap2/timer.c | 3 ++- > 2 files changed, 3 insertions(+), 2 deletions(-) > > diff --git a/arch/arm/mach-omap2/board-generic.c b/arch/arm/mach-omap2/board-generic.c > index 8e3daa1..5679464a 100644 > --- a/arch/arm/mach-omap2/board-generic.c > +++ b/arch/arm/mach-omap2/board-generic.c > @@ -229,7 +229,7 @@ DT_MACHINE_START(AM43_DT, "Generic AM43 (Flattened Device Tree)") > .init_late = am43xx_init_late, > .init_irq = omap_gic_of_init, > .init_machine = omap_generic_init, > - .init_time = omap3_sync32k_timer_init, > + .init_time = omap3_gptimer_timer_init, > .dt_compat = am43_boards_compat, > MACHINE_END > #endif > diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c > index 74044aa..b62de9f 100644 > --- a/arch/arm/mach-omap2/timer.c > +++ b/arch/arm/mach-omap2/timer.c > @@ -604,7 +604,8 @@ OMAP_SYS_32K_TIMER_INIT(3_secure, 12, "secure_32k_fck", "ti,timer-secure", > 2, "timer_sys_ck", NULL); > #endif /* CONFIG_ARCH_OMAP3 */ > > -#if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM33XX) > +#if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM33XX) || \ > + defined(CONFIG_SOC_AM43XX) > OMAP_SYS_GP_TIMER_INIT(3, 2, "timer_sys_ck", NULL, > 1, "timer_sys_ck", "ti,timer-alwon"); > #endif > -- > 1.7.9.5 > -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
