linux-kernel - Re: [PATCH 2/2] DTS: dra7: Add "opp_high" opp node to support 1.5 GHz SoC operation

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Date:   Mon, 6 Feb 2017 15:24:50 +0100
From:   Lukasz Majewski <lukma@...x.de>
To:     Dave Gerlach <d-gerlach@...com>
Cc:     Benoît Cousson <bcousson@...libre.com>,
        <linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        "Menon, Nishanth" <nm@...com>
Subject: Re: [PATCH 2/2] DTS: dra7: Add "opp_high" opp node to support 1.5
 GHz SoC operation

Hi Dave,

> On 02/03/2017 09:24 AM, Lukasz Majewski wrote:
> > The "opp_high" property brings support for 1.5 GHz CPU frequency
> > for TI's am57xx line of processors.
> >
> > Signed-off-by: Lukasz Majewski <lukma@...x.de>
> > ---
> >  arch/arm/boot/dts/dra7.dtsi | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> 
> This can't be blindly enabled for all am57xx SoCs, there is a
> forthcoming ti-cpufreq [1] driver that is needed that will decided
> which OPPs can and cannot be enabled for the specific variant in use.

Do you know if there is ongoing work on using Avs0 voltage (encoded in
efuse) to control the per SoC PMIC voltage value when switching to
opp_high (1.5 GHz)?


> 
> Regards,
> Dave
> 
> [1] http://www.spinics.net/lists/devicetree/msg158967.html
> 
> > diff --git a/arch/arm/boot/dts/dra7.dtsi
> > b/arch/arm/boot/dts/dra7.dtsi index a860a56..5e678cd 100644
> > --- a/arch/arm/boot/dts/dra7.dtsi
> > +++ b/arch/arm/boot/dts/dra7.dtsi
> > @@ -108,6 +108,11 @@
> >  			opp-hz = /bits/ 64 <1176000000>;
> >  			opp-microvolt = <1160000 885000 1160000>;
> >  		};
> > +
> > +		opp_high@...0000000 {
> > +			opp-hz = /bits/ 64 <1500000000>;
> > +			opp-microvolt = <1210000 950000 1250000>;
> > +		};
> >  	};
> >
> >  	/*
> >
> 




Best regards,

Lukasz Majewski

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