linux-kernel - Re: [PATCH] arm64: dts: rockchip: update cpu opp table for rk3399 op1

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Message-ID: <1552813.CRZkXFJCNX@diego>
Date:   Mon, 24 Apr 2017 12:35:39 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     Caesar Wang <sasukewxt@....com>
Cc:     Caesar Wang <wxt@...k-chips.com>,
        linux-rockchip@...ts.infradead.org, briannorris@...omium.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        dianders@...omium.org
Subject: Re: [PATCH] arm64: dts: rockchip: update cpu opp table for rk3399 op1

Am Montag, 24. April 2017, 18:25:49 CEST schrieb Caesar Wang:
> 在 2017年04月24日 17:15, Heiko Stübner 写道:
> > Am Montag, 24. April 2017, 16:49:08 CEST schrieb Caesar Wang:
> >> 在 2017年04月24日 16:26, Heiko Stübner 写道:
> >>> Hi Caesar,
> >>> 
> >>> Am Montag, 24. April 2017, 14:18:50 CEST schrieb Caesar Wang:
> >>>> Update the cpu opp table for rk3399 op1.
> >>> 
> >>> Ideally this should contain something about the "why".
> >>> Are these new voltage settings safer to operate under?
> >> 
> >> The before opp table is for earlier batch of rk3399 SoCs,  that's no
> >> enough for the current and
> >> newer batch of rk3399 op1. In order to suit for the rk3399 op1, we need
> >> to little voltages changed.
> > 
> > just to make sure, this is also safe for all the non-chromebook rk3399
> > socs
> > (like the firefly and tv-boxes, etc), right?
> 
> No,  just for chromebook.
> 
> Maybe, we need support two table for rk3399 SoCs.
> For chromebook supporting 2GHz frequency and others support 1.8GHz
> frequency.

Definitly. So please move the chromebook opp-table to something like a rk3399-
op1-opp.dtsi and adapt rk3399-opp.dtsi to be safe for all rk3399 variants.

Thanks
Heiko

> 
> For example:
> ....
>    opp03 {
>                opp-hz = /bits/ 64 <1008000000>;
>                opp-microvolt = <925000 925000 1350000>;
>                opp-microvolt-l0 = <925000 925000 1350000>;
>                opp-microvolt-l1 = <900000 900000 1350000>;
>            };
> ....
> 
> 
> 
> -Caesar
> 
> > Thanks
> > Heiko
> > 
> > _______________________________________________
> > Linux-rockchip mailing list
> > Linux-rockchip@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-rockchip

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