linux-kernel - Re: [PATCH 1/2] arm64: dts: Add dts files for Marvell Berlin4CT SoC

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Date:	Tue, 21 Jul 2015 22:50:06 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	Mark Rutland <mark.rutland@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	"khilman@...aro.org" <khilman@...aro.org>,
	"arnd@...db.de" <arnd@...db.de>, "olof@...om.net" <olof@...om.net>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"Pawel Moll" <Pawel.Moll@....com>, <marc.zyngier@....com>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/2] arm64: dts: Add dts files for Marvell Berlin4CT SoC

Dear Mark,

Thanks a lot for so quick review!

On Tue, 21 Jul 2015 15:34:26 +0100
Mark Rutland <mark.rutland@....com> wrote:

> Hi,
> 
> > +/dts-v1/;
> > +
> > +/memreserve/ 0x00000000 0x01000000;
> 
> What's this reservation for?

This is reserved for some firmwares' usage.

> 
> Given you're using PSCI I can't see why we'd expect the kernel to map
> but not use some memory.

Is it acceptable that we make memory start at 0x01000000 instead of reservation?

> 
> > +
> > +#include "berlin4ct.dtsi"
> > +
> > +/ {
> > +	model = "MARVELL BG4CT DMP BOARD";
> > +	compatible = "marvell,berlin4ct-dmp", "marvell,berlin4ct", "marvell,berlin";
> > +
> > +	chosen {
> > +		bootargs = "earlyprintk";
> > +		stdout-path = "serial0:115200n8";
> > +	};
> 
> You shouldn't need those bootargs; "earlyprintk" does nothing on arm64.

will fix in a newer version

> 
> [...]
> 
> > +		gic: interrupt-controller@...000 {
> > +			compatible = "arm,gic-400";
> > +			#interrupt-cells = <3>;
> > +			interrupt-controller;
> > +			reg = <0x901000 0x1000>,
> > +			      <0x902000 0x1000>,
> > +			      <0x904000 0x2000>,
> > +			      <0x906000 0x2000>;
> > +			interrupts = <GIC_PPI 9 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>;
> > +		};
> > +
> 
> I believe the size of the cpu interface (the second reg entry) should be
> 0x2000, as GICC_DIR is at offset 0x1000.

Oh, Yes! Thanks for pointing this out.

> 
> Otherwise this looks fine.
> 
> Thanks,
> Mark.

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