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

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Date:   Thu, 21 Mar 2019 18:13:25 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:     David Lechner <david@...hnology.com>, 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 17:44 Bartosz Golaszewski
<bgolaszewski@...libre.com> napisał(a):
>
> czw., 21 mar 2019 o 17:36 Bartosz Golaszewski
> <bgolaszewski@...libre.com> napisał(a):
> >
> > 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.
> >
>
> It seems this pmic is defined here[1] and a skeleton included here[2]
> and then the regulator constraints follow.
>
> Bart
>
> [1] https://elixir.bootlin.com/linux/latest/source/arch/arm/boot/dts/da850-evm.dts#L224
> [2] https://elixir.bootlin.com/linux/latest/source/arch/arm/boot/dts/da850-evm.dts#L326
>

Ok I retested and the patch will look like this:

diff --git a/arch/arm/boot/dts/da850-evm.dts b/arch/arm/boot/dts/da850-evm.dts
index f04bc3e15332..a0a1b3dccf37 100644
--- a/arch/arm/boot/dts/da850-evm.dts
+++ b/arch/arm/boot/dts/da850-evm.dts
@@ -191,6 +191,18 @@
         };
 };

+&cpu {
+        cpu-supply = <&vdcdc3_reg>;
+};
+
+&opp_375 {
+        status = "okay";
+};
+
+&opp_456 {
+        status = "okay";
+};
+
 &sata {
         status = "okay";
 };

I'll resend the whole series tomorrow to not spam Sekhar's mailbox anymore.

Bartosz

> > 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";
> > > >   };
> > > >
> > >