OMAP Timers with Linux

Hello Ran,

In addition to Titus' post, I suggest you taking a look on the wiki - http://www.omappedia.org/wiki/Timer

http://lxr.free-electrons.com/source/Documentation/devicetree/bindings/arm/omap/timer.txt

http://lxr.free-electrons.com/source/arch/arm/plat-omap/dmtimer.c

http://lxr.free-electrons.com/source/arch/arm/mach-omap2/timer.c

Best regards,

Yanko

Hi,

We are using OMAP3530, with SDK :

I think that the driver you've given is not relevant.

I think the HW timers are named in OMAP as "GP timer" (= dmtimer).

I try to see if there is any example how it is used, but didn't find. I guess I'll need to delve into the GT driver code...

Thanks,

Ran

Hi Titus, Yanko,

Thank you for the information source.
Yet, I seem to be missing the understanding of how to use these HW timers.

1. Does anyone knows what is the difference between the GT timer to DM timer. It seems that there are 2 interfaces, and that the GP timer uses DMtimers.
2. If I build some kernel module which uses HW timers, should I use the dmtimers interface or better use GP timers ?

Thank you,
Ran

Hi,

I see also the example of using GP timers with DM814x, DM816x

But I would like to ask how I can check which timers ID are available for use in kernel ?

or maybe it is just better to use

omap_dm_timer_request() 

instead of

omap_dm_timer_request_specific() ?

Thank you,
Ran