linux-kernel - Re: [linux-sunxi] Re: [PATCH 4/4] Add arch count timer node in dts for Allwinner A20(sunxi 7i).

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Date:	Thu, 12 Sep 2013 16:44:46 +0100
From:	Ian Campbell <ijc@...lion.org.uk>
To:	linux-sunxi@...glegroups.com
Cc:	Fan Rong <cinifr@...il.com>, "coosty@....com" <coosty@....com>,
	"maxime.ripard@...e-electrons.com" <maxime.ripard@...e-electrons.com>,
	"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"pawel.moll@....co" <pawel.moll@....co>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>
Subject: Re: [linux-sunxi] Re: [PATCH 4/4] Add arch count timer node in dts
 for Allwinner A20(sunxi 7i).

On Thu, 2013-09-12 at 15:57 +0100, Mark Rutland wrote:

> > +			interrupts = <1 13 0x308>,
> > +				     <1 14 0x308>,
> > +				     <1 11 0x308>,
> > +				     <1 10 0x308>;
> > +			clock-frequency = <24000000>;
> 
> If at all possible, your bootloader should set CNTFREQ, and
> clock-frequency should only be used as a last resort when it's
> impossible to get it to set CNTFREQ. It's not possible to set CNTFREQ
> from the non-secure side, so guests (which might not be Linux, and might
> not handle DT in the same way) may see a completely wrong frequency
> value.

https://groups.google.com/forum/#!topic/linux-sunxi/56Wj1IT-pKU

Ian.

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