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Message-ID: <CAK3cCByUJG42D6w4e1tdnXY0TQ517yOjQxFZJEnsyS4d0bxZyQ@mail.gmail.com>
Date: Fri, 13 Sep 2013 00:23:21 +0800
From: cinifr <cinifr@...il.com>
To: Ian Campbell <ijc@...lion.org.uk>
Cc: "linux-sunxi@...glegroups.com" <linux-sunxi@...glegroups.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 12 September 2013 23:44, Ian Campbell <ijc@...lion.org.uk> wrote:
> 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.
Yes, My bootloader dont set it, and I have to set it at dtsi fot
boot, I found <clock-frequency> is be set in dtsi file for ohters
cups.
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