linux-kernel - Re: [PATCH 0/2] Increase the maximum cpu frequency of rk3288

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Message-ID: <5474AAB4.2060301@rock-chips.com>
Date:	Wed, 26 Nov 2014 00:13:40 +0800
From:	Kever Yang <kever.yang@...k-chips.com>
To:	Chris Zhong <zyw@...k-chips.com>, heiko@...ech.de,
	dianders@...omium.org
CC:	Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/2] Increase the maximum cpu frequency of rk3288

Hi Chris,

On 11/25/2014 05:37 PM, Chris Zhong wrote:
> The maximum cpu frequency of rk3288 can up to 1.8Ghz, but the vdd_cpu need set
> to 1.4v. I've tested these patches on rk3288 evb board.
I'm not sure why you need this patch, I think we have a discuss
for the cpu operating point before.
In this case:
1. rk3288.dtsi is for all the rk3288 Soc based system, you may need
a separate opp table in rk3288-evb-rk808.dts;
2. 1.4V may beyond the supported voltage range too much,
     and it's not a good idea to add it to rk3288.dtsi as a safe voltage.
3. Do you have a stress/heavy load test on evb with 1.4v at 1.8GHz?

- Kever
>
>
> Chris Zhong (2):
>    ARM: dts: rockchip: change the max voltage of cpu to 1.4v
>    ARM: dts: rk3288: change the max clk of cpu to 1.8Ghz
>
>   arch/arm/boot/dts/rk3288-evb-rk808.dts | 2 +-
>   arch/arm/boot/dts/rk3288.dtsi          | 6 ++++--
>   2 files changed, 5 insertions(+), 3 deletions(-)
>


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