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

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Message-ID: <20150527104408.GB29002@arm.com>
Date:	Wed, 27 May 2015 11:44:08 +0100
From:	Will Deacon <will.deacon@....com>
To:	Fu Wei <fu.wei@...aro.org>
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

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
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