linux-kernel - Re: [PATCH 1/9] ARM: zynq: PM: Enable A9 internal clock gating feature

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Date:	Thu, 21 Aug 2014 10:20:17 -0700
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Michal Simek <michal.simek@...inx.com>
CC:	Russell King <linux@....linux.org.uk>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-pm@...r.kernel.org>, Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>
Subject: Re: [PATCH 1/9] ARM: zynq: PM: Enable A9 internal clock gating
 feature

On Thu, 2014-08-21 at 02:19PM +0200, Michal Simek wrote:
> On 08/20/2014 10:41 PM, Soren Brinkmann wrote:
> > Signed-off-by: Soren Brinkmann <soren.brinkmann@...inx.com>
> > ---
> >  arch/arm/mach-zynq/common.c  |  6 ++++++
> >  arch/arm/mach-zynq/common.h  | 11 +++++++++++
> >  arch/arm/mach-zynq/platsmp.c |  9 +++++++++
> >  3 files changed, 26 insertions(+)
> > 
> > diff --git a/arch/arm/mach-zynq/common.c b/arch/arm/mach-zynq/common.c
> > index 31a6fa40ba37..3cb7c198615a 100644
> > --- a/arch/arm/mach-zynq/common.c
> > +++ b/arch/arm/mach-zynq/common.c
> > @@ -98,6 +98,11 @@ static int __init zynq_get_revision(void)
> >  	return revision;
> >  }
> >  
> > +static void __init zynq_init_late(void)
> > +{
> > +	zynq_core_pm_init();
> > +}
> > +
> >  /**
> >   * zynq_init_machine - System specific initialization, intended to be
> >   *		       called from board specific initialization.
> > @@ -204,6 +209,7 @@ DT_MACHINE_START(XILINX_EP107, "Xilinx Zynq Platform")
> >  	.map_io		= zynq_map_io,
> >  	.init_irq	= zynq_irq_init,
> >  	.init_machine	= zynq_init_machine,
> > +	.init_late	= zynq_init_late,
> >  	.init_time	= zynq_timer_init,
> >  	.dt_compat	= zynq_dt_match,
> >  	.reserve	= zynq_memory_init,
> > diff --git a/arch/arm/mach-zynq/common.h b/arch/arm/mach-zynq/common.h
> > index f652f0a884a6..596ef0b5067c 100644
> > --- a/arch/arm/mach-zynq/common.h
> > +++ b/arch/arm/mach-zynq/common.h
> > @@ -40,4 +40,15 @@ extern void __iomem *zynq_scu_base;
> >  /* Hotplug */
> >  extern void zynq_platform_cpu_die(unsigned int cpu);
> >  
> > +static inline void zynq_core_pm_init(void)
> > +{
> > +	/* A9 clock gating */
> > +	asm volatile ("mrc  p15, 0, r12, c15, c0, 0\n"
> > +		      "orr  r12, r12, #1\n"
> > +		      "mcr  p15, 0, r12, c15, c0, 0\n"
> > +		      : /* no outputs */
> > +		      : /* no inputs */
> > +		      : "r12");
> > +}
> > +
> >  #endif
> > diff --git a/arch/arm/mach-zynq/platsmp.c b/arch/arm/mach-zynq/platsmp.c
> > index abc82ef085c1..616b99e07c60 100644
> > --- a/arch/arm/mach-zynq/platsmp.c
> > +++ b/arch/arm/mach-zynq/platsmp.c
> > @@ -112,6 +112,14 @@ static void __init zynq_smp_prepare_cpus(unsigned int max_cpus)
> >  	scu_enable(zynq_scu_base);
> >  }
> >  
> > +/*
> > + * This function is in the hotplug path. Don't move it into the init section!!
> > + */
> 
> Worth to use kernel-doc format here.

The secondary init function is kind of documented in
arch/arm/include/asm/smp.h as part of the smp_operations struct. Do you
want more documentation here?
	
	Sören

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