linux-kernel - RE: [PATCH] arm: ls1021a: utilize hrtimer based broadcast mode

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Message-ID: <BN3PR0301MB08675D5F0043133F62B33B0FFE9B0@BN3PR0301MB0867.namprd03.prod.outlook.com>
Date:	Tue, 14 Jul 2015 09:57:51 +0000
From:	Huan Wang <alison.wang@...escale.com>
To:	Mark Rutland <mark.rutland@....com>
CC:	"shawnguo@...nel.org" <shawnguo@...nel.org>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] arm: ls1021a: utilize hrtimer based broadcast mode

Hi, Mark,

> On Fri, Jul 10, 2015 at 10:39:05AM +0100, Alison Wang wrote:
> > Hrtimer based broadcast mode is used instead of periodic tick
> > broadcast to provide high resolution clock in SMP.
> >
> > Signed-off-by: Alison Wang <alison.wang@...escale.com>
> > ---
> >  arch/arm/mach-imx/mach-ls1021a.c | 11 +++++++++++
> >  1 file changed, 11 insertions(+)
> >
> > diff --git a/arch/arm/mach-imx/mach-ls1021a.c
> > b/arch/arm/mach-imx/mach-ls1021a.c
> > index b89c858..1a1a115 100644
> > --- a/arch/arm/mach-imx/mach-ls1021a.c
> > +++ b/arch/arm/mach-imx/mach-ls1021a.c
> > @@ -8,9 +8,19 @@
> >   */
> >
> >  #include <asm/mach/arch.h>
> > +#include <linux/clk-provider.h>
> > +#include <linux/clockchips.h>
> > +#include <linux/clocksource.h>
> >
> >  #include "common.h"
> >
> > +static void __init ls1021a_init_time(void) {
> > +	of_clk_init(NULL);
> > +	clocksource_of_init();
> > +	tick_setup_hrtimer_broadcast();
> > +}
> 
> It would be nicer to place this in the arch time_init() function, as
> already happens for arm64 and powerpc. That way everyone can benefit.
[Alison Wang] Yes, I think so.
Thanks.
> 
> Thanks,
> Mark.
> 
> > +
> >  static const char * const ls1021a_dt_compat[] __initconst = {
> >  	"fsl,ls1021a",
> >  	NULL,
> > @@ -18,5 +28,6 @@ static const char * const ls1021a_dt_compat[]
> > __initconst = {
> >
> >  DT_MACHINE_START(LS1021A, "Freescale LS1021A")
> >  	.smp		= smp_ops(ls1021a_smp_ops),
> > +	.init_time	= ls1021a_init_time,
> >  	.dt_compat	= ls1021a_dt_compat,
> >  MACHINE_END
> > --
> > 2.1.0.27.g96db324
> >
> >
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> >
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