On Mon, Jan 30, 2017 at 04:13:07PM +0300, Alexander Kochetkov wrote: > > > 30 янв. 2017 г., в 15:04, Daniel Lezcano <daniel.lezc...@linaro.org> > > написал(а): > > > > There is no case when the rockchip timer is used for the clockevent. > The is already timer entry for rk3228 in the DT. And it act as clockevent. I > guess it work as backup, > but I cannot test it also. In order to not break DT compatibility I had to > provide one timer to be > initialized as clockevent. And implemented implicit rule the driver (first DT > timer - clockevent, > second DT timer - clocksource) already exists for other timers. > > > If I'm not wrong, you can check /proc/interrupts and see there is no > > interrupt > > on the rockchip timer. > > Yes, you right here. I’ve temporary disable smp_twd to test rockchip timer > interrupts. > There is no interrupt on the rockchip timer during normal work. > > > - when the CPU enters a deep idle state. But such state does not exist on > > rk3188 > ARM chip/revision specific?
rk3188 specific. Applies also for rk3288 AFAICT. Without entering in the details, the SoC can't handle that. > > - when the system goes to suspend. But the timers are stopped in any case > > and > > CPU0 is always on. > There is timer for rk3228 in the DT. I guess there are situations where it > can be used. > May be the situations are also acceptable for rk3188? May be something like > suspend to RAM or > suspend to HDD? I am not expert in that questions. I can do some tests if you > give hint/link. Nope, rockchip clockevents won't be used, smp_twd will instead. You can check by commenting the local-timer in the DT, and you should see the /proc/interrupts line for the rockchip incrementing while the 'twd' are zero. > So, as I understood you suggest to leave only one timer what can be used as > clocksource > only. I can implement that, but there should be DT rule what allow to setup > timer > as clocksource only. I cannot do more without timer framework support. > Looks, like I have to wait your patch to implement that. No, actually I meant the rockchip clockevents won't be used for both rk3188 and rk3288, they are not needed. It is for information, this patch is ok. -- Daniel -- <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog
