linux-kernel - Re: [PATCH v4 3/5] arm64: dts: Add Cavium ThunderX specific PMU

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Date:	Mon, 22 Feb 2016 13:40:34 +0100
From:	Jan Glauber <jan.glauber@...iumnetworks.com>
To:	Will Deacon <will.deacon@....com>
CC:	Mark Rutland <mark.rutland@....com>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 3/5] arm64: dts: Add Cavium ThunderX specific PMU

On Thu, Feb 18, 2016 at 05:32:48PM +0000, Will Deacon wrote:
> On Thu, Feb 18, 2016 at 05:50:12PM +0100, Jan Glauber wrote:
> > Add a compatible string for the Cavium ThunderX PMU.
> 
> Stupid question, but is "thunder" the name of the CPU or the SoC or ...?
> 
> Whatever we use to describe the PMU, should probably also identify the
> CPU uniquely.

The CPU is currently:

compatible = "cavium,thunder", "arm,armv8";

We clearly need better names in case of a subsequent CPU, but for now
I think we should stick to the existing name.

Jan

> Will
> 
> > Signed-off-by: Jan Glauber <jglauber@...ium.com>
> > ---
> >  Documentation/devicetree/bindings/arm/pmu.txt | 1 +
> >  arch/arm64/boot/dts/cavium/thunder-88xx.dtsi  | 5 +++++
> >  2 files changed, 6 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/arm/pmu.txt b/Documentation/devicetree/bindings/arm/pmu.txt
> > index 5651883..d3999a1 100644
> > --- a/Documentation/devicetree/bindings/arm/pmu.txt
> > +++ b/Documentation/devicetree/bindings/arm/pmu.txt
> > @@ -25,6 +25,7 @@ Required properties:
> >  	"qcom,scorpion-pmu"
> >  	"qcom,scorpion-mp-pmu"
> >  	"qcom,krait-pmu"
> > +	"cavium,thunder-pmu"
> >  - interrupts : 1 combined interrupt or 1 per core. If the interrupt is a per-cpu
> >                 interrupt (PPI) then 1 interrupt should be specified.
> >  
> > diff --git a/arch/arm64/boot/dts/cavium/thunder-88xx.dtsi b/arch/arm64/boot/dts/cavium/thunder-88xx.dtsi
> > index 9cb7cf9..2eb9b22 100644
> > --- a/arch/arm64/boot/dts/cavium/thunder-88xx.dtsi
> > +++ b/arch/arm64/boot/dts/cavium/thunder-88xx.dtsi
> > @@ -360,6 +360,11 @@
> >  		             <1 10 0xff01>;
> >  	};
> >  
> > +	pmu {
> > +		compatible = "cavium,thunder-pmu", "arm,armv8-pmuv3";
> > +		interrupts = <1 7 4>;
> > +	};
> > +
> >  	soc {
> >  		compatible = "simple-bus";
> >  		#address-cells = <2>;
> > -- 
> > 1.9.1
> >