AM6442: Timers support in linux

Hi Abdul,

I have assigned your query to our expert. He is currently out of office, so the response may be delayed.

In the meantime, I found these below threads on Timers. See if it helps.

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1057097/am6442-timers-used-in-linux-sdk

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1107119/am6442-peripherals-timer-modules-timers

Apologies for the delay.

Best Regards,

Suren

Hi Suren, I think timer-ti-dm.c in clocksource is a driver for DM timer. But How can I access their omap_dm_timer_ops function in another driver to use timers in my other linux drivers 

Hello Abdul,

Can you point me to the post where you found that information?

As far as I am aware, our Linux team has not added support for using the dmtimers in AM64x SDK 9.0. However, I will ask around.

Regards,

Nick

HI Nick, I'm not using AM64x SDK I'm using linux 6.1.22 version from linux repo and that version have timer-ti-dm deriver support.

timer-ti-dm.c - drivers/clocksource/timer-ti-dm.c - Linux source code (v6.1.22) - Bootlin

Hello Abdul,

let me clarify what we mean by "support":

"support" does not mean that a driver exists that was written by someone for some random processor.

"Support" means that the TI developers have specifically tested a peripheral's driver with a specific processor, and we can verify that the driver works with the peripheral on that software release.

As far as I can tell, the Linux dmtimer driver is not supported on AM64x Linux SDK 9.0, since we have not tested the driver with that device, so we cannot guarantee that it will work.

I am double-checking with the development team though, and I will let you know if I hear anything different.

Future updates might be on your other thread, https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1282449/am6442-how-to-enable-and-configure-dmtimer-in-linux 

Regards,

Nick

Update: the developers expect that the AM64x dmtimers should work exactly like the AM62x dmtimers (potentially without driver modifications), as long as the devicetree nodes are written correctly.

I have filed a requirement to add official TI support for the AM64x Linux dmtimer drivers. I do not have a specific timeframe for when that support will be added at this point in time.

Regards,

Nick