linux-kernel - Re: [PATCH 18/20] clocksource / acpi: Add macro CLOCKSOURCE_ACPI

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Message-ID: <3140612.0s75qS6VKb@wuerfel>
Date:	Wed, 22 Jan 2014 15:56:05 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Mark Rutland <mark.rutland@....com>
Cc:	Hanjun Guo <hanjun.guo@...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>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Olof Johansson <olof@...om.net>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Rob Herring <robh@...nel.org>,
	"patches@...aro.org" <patches@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
	Amit Daniel Kachhap <amit.daniel@...sung.com>
Subject: Re: [PATCH 18/20] clocksource / acpi: Add macro CLOCKSOURCE_ACPI_DECLARE

On Wednesday 22 January 2014 11:46:16 Mark Rutland wrote:
> On Mon, Jan 20, 2014 at 09:08:32AM +0000, Hanjun Guo wrote:
> > On 2014-1-17 22:21, Arnd Bergmann wrote:
> > > On Friday 17 January 2014, Hanjun Guo wrote:
> > >>
> > >> From: Amit Daniel Kachhap <amit.daniel@...sung.com>
> > >>
> > >> This macro does the same job as CLOCKSOURCE_OF_DECLARE. The device
> > >> name from the ACPI timer table is matched with all the registered
> > >> timer controllers and matching initialisation routine is invoked.
> > > 
> > > I wouldn't anticipate this infrastructure to be required. Shouldn't all
> > > ARMv8 machines have an architected timer?
> > 
> > I not sure of this, could anyone can give some guidance? if only arch
> > timer is available for ARM64, this will make thing very simple.
> 
> All ARMv8 systems should have an architected timer.
> 
> However, they may also have other timers (e.g. global timers for use
> when CPUs are in low power states and their local architected timers
> aren't active).

But all other timers could be regular platform drivers I suppose. No
need for special infrastructure for those.

	Arnd
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