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

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Date:	Fri, 24 Jan 2014 17:19:41 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Mark Rutland <mark.rutland@....com>,
	"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 2014年01月22日 22:56, Arnd Bergmann wrote:
> 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.

One more information, acpi_early_init() is run before timekeeping_init()
now, and that patch was merged into 3.14-rc1. So we can initialize
timers for scanning the DSDT table, and it also means that timer defined
in DSDT can be initialized early enough.

Thanks
Hanjun



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