linux-kernel - Re: [PATCH v2] Add suspend/resume for HPET

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Message-ID: <Pine.LNX.4.64.0703311004310.6730@woody.linux-foundation.org>
Date:	Sat, 31 Mar 2007 10:09:15 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Maxim Levitsky <maximlevitsky@...il.com>
cc:	tglx@...utronix.de, Sergei Shtylyov <sshtylyov@...mvista.com>,
	Ingo Molnar <mingo@...e.hu>,
	Jeff Chua <jeff.chua.linux@...il.com>,
	Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, pavel@...e.cz,
	linux-pm@...ts.osdl.org, gregkh@...e.de,
	linux-pci@...ey.karlin.mff.cuni.cz,
	Jens Axboe <jens.axboe@...cle.com>,
	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
	jgarzik@...ox.com, linux-ide@...r.kernel.org,
	"Michael S. Tsirkin" <mst@...lanox.co.il>
Subject: Re: [PATCH v2] Add suspend/resume for HPET



On Sat, 31 Mar 2007, Maxim Levitsky wrote:
> 
> So maybe I was right afrer all,
> Maybe it is better to add a suspend/resume hook to each clock source and call 
> it from timekeeping_resume() ?

Umm.. WHy not make the device tree look like this:

	    -- "clocksource" -- +-- HPET
				|
				+-- TSC
				|
				+-- i8259
				|
				+-- lapic timer
				|
				.. whatever else

and use the "struct device" that we *have* for this? The whole "struct 
device" is literally designed to do this, and to be embedded into whatever 
bigger structures you have that describes higher-level behaviour. Ie you'd 
put a "struct device" inside the "struct clocksource".

That thingalready *has* the suspend/resume hooks, and it will mean that 
people will see the clocks in the device tree rather than have a new 
notion.


			Linus
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