linux-kernel - Re: [PATCH v2 2/2] ARM: dts: sun8i: a83t: Add missing CPU clock references

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Date:   Mon, 1 Apr 2019 13:30:47 +0200
From:   Ondřej Jirman <megous@...ous.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-sunxi@...glegroups.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] ARM: dts: sun8i: a83t: Add missing CPU clock
 references

Hello Maxime,

On Mon, Apr 01, 2019 at 10:22:42AM +0200, Maxime Ripard wrote:
> Hi,
> 
> On Thu, Mar 28, 2019 at 12:31:59PM +0100, megous@...ous.com wrote:
> > From: Ondrej Jirman <megous@...ous.com>
> >
> > A83T DTSI has cpu clocks defined only on the first CPU in each cluster.
> > We can bring down any CPU in the cluster, so we need to define clock
> > for each CPU, so that the system knows what clock to use if the first
> > CPU is down.
> >
> > Signed-off-by: Ondrej Jirman <megous@...ous.com>
> > ---
> >  arch/arm/boot/dts/sun8i-a83t.dtsi | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/sun8i-a83t.dtsi b/arch/arm/boot/dts/sun8i-a83t.dtsi
> > index 7a40b7d77ec0..1b0b025b9250 100644
> > --- a/arch/arm/boot/dts/sun8i-a83t.dtsi
> > +++ b/arch/arm/boot/dts/sun8i-a83t.dtsi
> > @@ -73,6 +73,8 @@
> >  		};
> >
> >  		cpu@1 {
> > +			clocks = <&ccu CLK_C0CPUX>;
> 
> Usually we'll have the compatible first

I'll re-order it.

> > +			clock-names = "cpu";
> 
> And that's not documented anywhere?

Cpufreq doesn't use CPU clock names, except for the mediatek cpufreq driver.

It's not docummented explicitly, except it's used as part of examples in
bindings/opp/opp.txt.

I guess I can safely drop it, but other will probably keep using it, because
it's part of the examples.

thank you and regards,
  Ondrej

> Maxime
> 
> --
> Maxime Ripard, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com