linux-kernel - Re: [PATCH 2/3] ARM: dts: document the berlin enable-method property

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Message-ID: <533D2C9A.6010302@gmail.com>
Date:	Thu, 03 Apr 2014 09:40:42 +0000
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Antoine Ténart 
	<antoine.tenart@...e-electrons.com>,
	Jisheng Zhang <jszhang@...vell.com>
CC:	"alexandre.belloni@...e-electrons.com" 
	<alexandre.belloni@...e-electrons.com>,
	Jimmy Xu <zmxu@...vell.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] ARM: dts: document the berlin enable-method property

On 04/03/2014 09:14 AM, Antoine Ténart wrote:
> On 03/04/2014 10:54, Antoine Ténart wrote:
>> On 03/04/2014 10:22, Jisheng Zhang wrote:
>>> On Thu, 3 Apr 2014 01:08:15 -0700
>>> Antoine Ténart <antoine.tenart@...e-electrons.com> wrote:
>>>
>>>> Signed-off-by: Antoine Ténart <antoine.tenart@...e-electrons.com>
>>>> ---
>>>>   Documentation/devicetree/bindings/arm/cpus.txt | 2 ++
>>>>   1 file changed, 2 insertions(+)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/arm/cpus.txt
>>>> b/Documentation/devicetree/bindings/arm/cpus.txt index
>>>> 333f4aea3029..a9e42a2dbc99 100644 ---
>>>> a/Documentation/devicetree/bindings/arm/cpus.txt +++
>>>> b/Documentation/devicetree/bindings/arm/cpus.txt @@ -185,6 +185,8 @@
>>>> nodes
>>>> to be present and contain the properties described below.
>>>> "qcom,gcc-msm8660"
>>>>                   "qcom,kpss-acc-v1"
>>>>                   "qcom,kpss-acc-v2"
>>>> +                "marvell,88de31-smp" - cpu-core handling for
>>>
>>> why not "marvell,berlin-smp"?
>>
>> We have SMP on the BG2 and the BG2Q currently. Future boards may not be
>> compatible with this method (BG3 ?), I think "marvell,berlin-smp" is too
>> generic.
>>
>> We could use "marvell,88de31xx-smp" as Alexandre suggested.
>
> "marvell,88de31xx-smp" is not a good choice too, since futur SoC may
> match the "xx" and not use this method. A better way should be to use
> the first SoC implementing the feature, so "marvell,88de3100".

Never introduce the SoC numbers, we have chosen to stick with
berlin2{,cd,q} so use that.

Given the comment from Mark Rutland and Russell King here[1], I'd rather
concentrate on a proper SMP implementation. Unfortunately, I haven't
found a good documentation about the requirements nor call sequence -
but I haven't looked hard.

Having said that, can we postpone the DT enable method patches until
we agreed on a better SMP implementation?

Sebastian

[1] http://www.spinics.net/lists/arm-kernel/msg318585.html

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