linux-kernel - Re: [PATCH 01/10] clocksource: dw_apb_timer_of: use the clocksource as sched clock if necessary

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Message-ID: <CACRpkdYAvUQ+aymJm1Fw1bE1aGdO7RUqLR9byvoT7ECTk4tkpw@mail.gmail.com>
Date:	Tue, 4 Jun 2013 08:34:44 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Heiko Stübner <heiko@...ech.de>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mike Turquette <mturquette@...aro.org>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Chris Ball <cjb@...top.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>
Subject: Re: [PATCH 01/10] clocksource: dw_apb_timer_of: use the clocksource
 as sched clock if necessary

On Mon, Jun 3, 2013 at 12:56 AM, Heiko Stübner <heiko@...ech.de> wrote:

> Currently the dw_apb_timer always expects a separate special timer to be
> availbable for the sched_clock. Some devices using dw_apb_timers do not
> have the sptimer but can use the clocksource as sched_clock.
> Therefore this patch adds using the clocksource timer as
> a fallback if no usable sched timer is found.
>
> Signed-off-by: Heiko Stuebner <heiko@...ech.de>

Is this really what the patch does? I mean "ass the clocksourse as
fallback", it seems more like that is controlled from the device tree,
this looks more like some more careful handling of the device tree
input making the sched_timer optional, it doesn't really "add"
anything, does it?

Yours,
Linus Walleij
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