Re: [PATCH v3 0/8] NVIDIA Tegra clocksource driver improvements

[Peter De Schrijver]

On Fri, May 24, 2019 at 06:32:45PM +0300, Dmitry Osipenko wrote:
> Hello,
> 
> This series primarily unifies the driver code across all Tegra SoC
> generations. In a result the clocksources are allocated per-CPU on
> older Tegra's and have a higher rating than the arch-timer, the newer
> Tegra210 is getting support for microsecond clocksource and the driver's
> code is getting much cleaner. Note that arch-timer usage is discouraged on
> all Tegra's due to the time jitter caused by the CPU frequency scaling.

I think the limitations are more as follows:

Chip	timer		suffers cpu dvfs jitter		can wakeup from cc7
T20	us-timer	No				Yes
T20	twd timer	Yes				No?
T30	us-timer	No				Yes
T30	twd timer	Yes				No?
T114	us-timer	No				Yes
T114	arch timer	No				Yes
T124	us-timer	No				Yes
T124	arch timer	No				Yes
T210	us-timer	No				Yes
T210	arch timer	No				No
T210	clk_m timer	No				Yes

right?

Peter.