Message-ID: <5474AAB4.2060301@rock-chips.com>
Date: Wed, 26 Nov 2014 00:13:40 +0800
From: Kever Yang <kever.yang@rock-chips.com>
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To: Chris Zhong <zyw@rock-chips.com>, heiko@sntech.de, dianders@chromium.org
CC: Mark Rutland <mark.rutland@arm.com>, devicetree@vger.kernel.org,
        Russell King <linux@arm.linux.org.uk>, Pawel Moll <pawel.moll@arm.com>,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        Linus Walleij <linus.walleij@linaro.org>, linux-kernel@vger.kernel.org,
        linux-rockchip@lists.infradead.org, Rob Herring <robh+dt@kernel.org>,
        Kumar Gala <galak@codeaurora.org>,
        linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 0/2] Increase the maximum cpu frequency of rk3288
References: <1416908253-31721-1-git-send-email-zyw@rock-chips.com>
In-Reply-To: <1416908253-31721-1-git-send-email-zyw@rock-chips.com>
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Sender: linux-kernel-owner@vger.kernel.org

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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