Messages in this thread | | | Date | Fri, 21 Dec 2012 00:13:48 +0200 | From | Peter De Schrijver <> | Subject | Re: [PATCH 5/9] clocksource: tegra: Enable ARM arch_timer with TSC |
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> > > > "tegra114.dtsi" has the folloiwng "tsc" entry. So can we consider that > > if dts has this entry, CNTFRQ is not set, which implies it's in secure > > mode. kernel should set it up by itself? Otherwise, skip this setup > > and use it. For example: > > > > tsc { > > compatible = "nvidia,tegra114-tsc"; > > reg = <0x700f0000 0x20000>; > > + setup-cntfrq; > > }; > > > > Is this what you explained in the above? > > At least, kernel can survive without bootloader/firmware support, ATM. > > No. The DT should only describe the hardware, and not something that is > Linux specific. > > Just use the "clock-frequency" attribute in the timer arch-timer node, > and get rid of this CNTFRQ setting. The driver already knows how to deal > with this situation if this attribute is set.
The frequency is probed at boottime by the kernel though. It will not necessarily be the same for every board.
Cheers,
Peter.
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