linux-kernel - Re: [RFC part3 PATCH 2/2] ARM64 / clocksource: Use arch_timer_acpi

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Message-ID: <20131203144309.GC7552@e106331-lin.cambridge.arm.com>
Date:	Tue, 3 Dec 2013 14:43:09 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Hanjun Guo <hanjun.guo@...aro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Olof Johansson <olof@...om.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Jon Masters <jonathan@...masters.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Patch Tracking <patches@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linaro-kernel <linaro-kernel@...ts.linaro.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>
Subject: Re: [RFC part3 PATCH 2/2] ARM64 / clocksource: Use
 arch_timer_acpi_init()

On Tue, Dec 03, 2013 at 02:13:49PM +0000, Linus Walleij wrote:
> On Tue, Dec 3, 2013 at 2:52 PM, Hanjun Guo <hanjun.guo@...aro.org> wrote:
> 
> > I will introduce has_arch_timer_node() as you said and use
> > it as follows:
> >
> > if (has_arch_timer_node())
> > clocksource_of_init();
> > esle
> > arch_timer_acpi_init(); /* try ACPI way */
> >
> > Is this make sense to you?

What does arch_timer_acpi_init() do? Is it just detecting the presence
of the timer, or grabbing the rate from a property in an ACPI table?

Mark.
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