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

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Date:	Mon, 14 Nov 2011 09:41:13 -0600
From:	Rob Herring <robherring2@...il.com>
To:	Peter De Schrijver <pdeschrijver@...dia.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 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.

Rob


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