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

[Heiko Stübner]

Am Dienstag, 4. Juni 2013, 08:34:44 schrieb Linus Walleij:
> On Mon, Jun 3, 2013 at 12:56 AM, Heiko Stübner <heiko at sntech.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 at sntech.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?

Right, the commit message is probably based a bit to much on the before-state 
of the driver, always expecting the "sptimer" and panicing if not found.

How about:

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 this sptimer but can use the clocksource as sched_clock instead.

Therefore enable the driver to distiguish between devices with and without
sptimer based on the devicetree data and select the correct timer as
sched_clock.