linux-kernel - Re: [PATCH 2/7] arm: dt: zynq: Add 'cpus' node

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Message-ID: <d439357d-2451-405d-acf5-8514c50c779a@AM1EHSMHS002.ehs.local>
Date:	Tue, 12 Nov 2013 13:58:17 -0800
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@....com>,
	Peter Crosthwaite <peter.crosthwaite@...inx.com>
CC:	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Pawel Moll <Pawel.Moll@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Russell King <linux@....linux.org.uk>,
	Michal Simek <michal.simek@...inx.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/7] arm: dt: zynq: Add 'cpus' node

On Tue, Nov 12, 2013 at 10:06:05AM -0800, Sören Brinkmann wrote:
> On Mon, Nov 11, 2013 at 06:57:44PM +0000, Sudeep KarkadaNagesha wrote:
> > On 08/11/13 21:21, Soren Brinkmann wrote:
> > > Add a 'cpus' node to describe the CPU cores of Zynq.
> > > 
> > > Signed-off-by: Soren Brinkmann <soren.brinkmann@...inx.com>
> > > Acked-by: Peter Crosthwaite <peter.crosthwaite@...inx.com>
> > > ---
> > >  arch/arm/boot/dts/zynq-7000.dtsi | 27 +++++++++++++++++++++++++++
> > >  1 file changed, 27 insertions(+)
> > > 
> > > diff --git a/arch/arm/boot/dts/zynq-7000.dtsi b/arch/arm/boot/dts/zynq-7000.dtsi
> > > index 27ebc1ba9671..37fc04525142 100644
> > > --- a/arch/arm/boot/dts/zynq-7000.dtsi
> > > +++ b/arch/arm/boot/dts/zynq-7000.dtsi
> > > @@ -15,6 +15,33 @@
> > >  / {
> > >  	compatible = "xlnx,zynq-7000";
> > >  
> > > +	cpus {
> > > +		#address-cells = <1>;
> > > +		#size-cells = <0>;
> > > +
> > > +		cpu@0 {
> > > +			compatible = "arm,cortex-a9";
> > > +			device_type = "cpu";
> > > +			reg = <0>;
> > > +			clocks = <&clkc 3>;
> > > +			i-cache-size = <0x8000>;
> > > +			i-cache-line-size = <0x20>;
> > > +			d-cache-size = <0x8000>;
> > > +			d-cache-line-size = <0x20>;
> > 
> > These cache properties can be identified through CCSIDR(Cache Size ID Registers)
> > on ARMv7 Cortex implementations. It's better not to have these in DT if they can
> > be identified runtime.
> Sounds good to me. I'll go ahead an remove them.
BTW: Documentation/devicetree/booting-without-of.txt lists those
properties at least as recommended. That should probably be updated.

	Sören


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