linux-kernel - Re: [PATCH v3 6/6] ACPI: import watchdog info of GTDT into platform device

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Message-ID: <CADyBb7vH4_w7nL_G7Kem1RcMeSTRoMCZNPCM5JphSdZok-RX7w@mail.gmail.com>
Date:	Fri, 29 May 2015 19:13:39 +0800
From:	Fu Wei <fu.wei@...aro.org>
To:	Will Deacon <will.deacon@....com>
Cc:	Guenter Roeck <linux@...ck-us.net>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	"linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"tekkamanninja@...il.com" <tekkamanninja@...il.com>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	"al.stone@...aro.org" <al.stone@...aro.org>,
	"hanjun.guo@...aro.org" <hanjun.guo@...aro.org>,
	"timur@...eaurora.org" <timur@...eaurora.org>,
	"arnd@...db.de" <arnd@...db.de>,
	"vgandhi@...eaurora.org" <vgandhi@...eaurora.org>,
	"wim@...ana.be" <wim@...ana.be>, "jcm@...hat.com" <jcm@...hat.com>,
	"leo.duran@....com" <leo.duran@....com>,
	"corbet@....net" <corbet@....net>,
	Mark Rutland <Mark.Rutland@....com>,
	Catalin Marinas <Catalin.Marinas@....com>
Subject: Re: [PATCH v3 6/6] ACPI: import watchdog info of GTDT into platform device

Hi Will,

As you know, I have moved all the GTDT code to ACPI driver , and
simplify the GTDT relevant code in arm_arch_timer.c. That will be in
my next patchset.
but you can check here :
https://git.linaro.org/people/fu.wei/linux.git/shortlog/refs/heads/acpi-topic-sbsa-watchdog_upstream_v4_devel

Great thanks for your suggestion!

On 27 May 2015 at 18:44, Will Deacon <will.deacon@....com> wrote:
> On Tue, May 26, 2015 at 05:27:33PM +0100, Fu Wei wrote:
>> On 26 May 2015 at 23:36, Guenter Roeck <linux@...ck-us.net> wrote:
>> > On Tue, May 26, 2015 at 04:18:42PM +0100, Will Deacon wrote:
>> >> Sure, the device it describes may only ever exist on ARM systems, but by
>> >> that logic then we should be moving lots of drivers back under arch/arm[64].
>> >>
>> > It is nt the driver, but its instantiation. The question here would be
>> > how and where to instantiate the driver, not where the driver itself
>> > is located. The driver itself is ACPI agnostic.
>>
>> I really don't mind to refactor the code, If we can make this patch better.
>>
>> But for now, I can't see the good reason to move ACPI-relevant code
>> into a watchdog driver.
>
> I don't really mind where you move it, just as long as it's outside of
> arch/arm64.
>
>> The reasons I put the code here are
>> (1)SBSA watchdog only for ARM64
>> (2)GTDT only for ARM, design for ARM,
>> (3)For ARM Architecture, only ARM64 support ACPI.
>>
>> For minimizing arch/arm64/kernel/acpi.c, we can't put the code here,
>> and we had better keep these code outside the driver,
>>
>> So do you have any suggestion for the better location of the GTDT code?
>
> I don't understand why you can't do the same as
> drivers/clocksource/arm_arch_timer.c and parse the table directly in the
> driver. If there are objections from the driver/subsystem maintainers then
> it sounds like we need a mechanical ACPI table -> platform device
> conversion in the core, like we have for device-tree.
>
> Will



-- 
Best regards,

Fu Wei
Software Engineer
Red Hat Software (Beijing) Co.,Ltd.Shanghai Branch
Ph: +86 21 61221326(direct)
Ph: +86 186 2020 4684 (mobile)
Room 1512, Regus One Corporate Avenue,Level 15,
One Corporate Avenue,222 Hubin Road,Huangpu District,
Shanghai,China 200021
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