Re: Writing clocksource driver, tips?
From: Thomas Gleixner
Date: Mon Sep 01 2014 - 04:35:23 EST
On Sun, 31 Aug 2014, Oleksij Rempel wrote:
> - 1 timer can be used for clocksource other as clock_event_device, how
> can i use other 2 timers on same controller. and how can i use other 3
> controllers?
All you need is two.
One for the clocksource (free running counter):
100MHz is fine, it gives the timekeeping code nice
granularity. There is no need for a wrap around interrupt. The
core code knows how to deal with it.
The second one is for the clock event device
Avoid a match timer if possible, it's a pain in the neck. Either a
autoreloading timer for the periodic mode or a simple downcounting
one for one shot mode is good enough.
The other timers are not of any value for Linux. Just leave them
alone.
Thanks,
tglx
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