linux-kernel - Re: [PATCH 3/4] ARM: dts: da850-evm: enable cpufreq

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Date:   Thu, 21 Mar 2019 17:36:05 +0100
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     David Lechner <david@...hnology.com>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>, Sekhar Nori <nsekhar@...com>,
        Kevin Hilman <khilman@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        linux-devicetree <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Adam Ford <adam.ford@...icpd.com>
Subject: Re: [PATCH 3/4] ARM: dts: da850-evm: enable cpufreq

czw., 21 mar 2019 o 16:53 David Lechner <david@...hnology.com> napisał(a):
>
> On 3/21/19 9:10 AM, Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> >
> > Enable cpufreq-dt support for da850-evm. The cvdd regulator is fixed
> > at 1.2V on this board so disable the lower operating points and enable
> > the 375MHz opp.
>
>
> The board-da850-evm.c file seems to indicate that this regulator is
> variable and comes from the tps65070. This regulator seems to be missing
> from the device tree though, even though it has device tree bindings.
>

Oh snap, you're right. I glanced over the 1.2V comment and thought
it's the same as other boards, but actually it specifies: .min_uV =
950000, .max_uV = 1350000, so all the operating points should work on
that one.

Bart

> Cc: Adam Ford
>
>
> >
> > Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> > ---
> >   arch/arm/boot/dts/da850-evm.dts | 30 ++++++++++++++++++++++++++++++
> >   1 file changed, 30 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/da850-evm.dts b/arch/arm/boot/dts/da850-evm.dts
> > index f04bc3e15332..f63867692da4 100644
> > --- a/arch/arm/boot/dts/da850-evm.dts
> > +++ b/arch/arm/boot/dts/da850-evm.dts
> > @@ -151,6 +151,15 @@
> >                       system-clock-frequency = <24576000>;
> >               };
> >       };
> > +
> > +     cvdd: regulator0 {
> > +             compatible = "regulator-fixed";
> > +             regulator-name = "cvdd";
> > +             regulator-min-microvolt = <1200000>;
> > +             regulator-max-microvolt = <1200000>;
> > +             regulator-always-on;
> > +             regulator-boot-on;
> > +     };
> >   };
> >
> >   &ecap2 {
> > @@ -191,6 +200,27 @@
> >       };
> >   };
> >
> > +&cpu {
> > +     cpu-supply = <&cvdd>;
> > +};
> > +
> > +/*
> > + * DA850-EVM has a fixed CVDD of 1.2V - we cannot go below 300MHz or
> > + * above 375MHz.
> > + */
> > +
> > +&opp_100 {
> > +     status = "disabled";
> > +};
> > +
> > +&opp_200 {
> > +     status = "disabled";
> > +};
> > +
> > +&opp_375 {
> > +     status = "okay";
> > +};
> > +
> >   &sata {
> >       status = "okay";
> >   };
> >
>