linux-kernel - Re: [PATCH v4 01/10] arm/tegra: initial device tree for tegra30

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Message-ID: <20111114160633.GK19069@tbergstrom-lnx.Nvidia.com>
Date:	Mon, 14 Nov 2011 18:06:33 +0200
From:	Peter De Schrijver <pdeschrijver@...dia.com>
To:	Rob Herring <robherring2@...il.com>
CC:	Stephen Warren <swarren@...dia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Colin Cross <ccross@...roid.com>,
	"Olof Johansson" <olof@...om.net>,
	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 01/10] arm/tegra: initial device tree for tegra30

On Mon, Nov 14, 2011 at 04:41:13PM +0100, Rob Herring wrote:
> On 11/14/2011 09:25 AM, Peter De Schrijver wrote:
> > On Sat, Nov 12, 2011 at 04:26:30AM +0100, Rob Herring wrote:
> >> On 11/11/2011 05:22 AM, Peter De Schrijver wrote:
> >>> This patch adds the initial device tree for tegra30
> >>>
> >>> Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>
> >>> ---
> >>>  arch/arm/boot/dts/tegra30.dtsi |  127 ++++++++++++++++++++++++++++++++++++++++
> >>>  1 files changed, 127 insertions(+), 0 deletions(-)
> >>>  create mode 100644 arch/arm/boot/dts/tegra30.dtsi
> >>>
> >>> diff --git a/arch/arm/boot/dts/tegra30.dtsi b/arch/arm/boot/dts/tegra30.dtsi
> >>> new file mode 100644
> >>> index 0000000..fabe243
> >>> --- /dev/null
> >>> +++ b/arch/arm/boot/dts/tegra30.dtsi
> >>> @@ -0,0 +1,127 @@
> >>> +/include/ "skeleton.dtsi"
> >>> +
> >>> +/ {
> >>> +	compatible = "nvidia,tegra30";
> >>
> >> Needs documentation.
> >>
> >>> +	interrupt-parent = <&intc>;
> >>> +
> >>> +	intc: interrupt-controller@...41000 {
> >>> +		compatible = "nvidia,tegra30-gic", "nvidia,tegra20-gic";
> >>> +		interrupt-controller;
> >>> +		#interrupt-cells = <1>;
> >>
> >> Is the Tegra GIC really different from a standard A9 gic? You need to
> >> update to use the gic binding. The cells should be 3 for example.
> > 
> > It has an extra 'legacy' interrupt controller like tegra20 has. This is used
> > when waking up the CPU from power off mode.
> 
> Although that is probably not part of the GIC h/w (i.e. at a different
> address) and should be described in the dts separately. That doesn't
> change the GIC binding or the fact that you are using
> arch/arm/common/gic.c though. Whether you have a different compatible
> string or not is not really the issue. That can already be supported if
> necessary. The issue is you are not using the existing GIC binding as a
> starting point and that has implications on every node using a GIC
> interrupt.
> 

The GIC is the same as the one used on tegra20. So I copied the binding from
tegra20.dtsi. Is that one wrong too then?

Cheers,

Peter.
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