linux-kernel - Re: [PATCH v4 1/5] dt-bindings: add SMP enable-method for Broadcom NSP

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Date:	Sun, 6 Dec 2015 23:59:28 +0530
From:	Kapil Hali <kapilh@...adcom.com>
To:	Rob Herring <robh@...nel.org>
CC:	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Ray Jui <rjui@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Jon Mason <jonmason@...adcom.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	"Gregory Fong" <gregory.0xf0@...il.com>,
	Lee Jones <lee@...nel.org>, Hauke Mehrtens <hauke@...ke-m.de>,
	Kever Yang <kever.yang@...k-chips.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Olof Johansson <olof@...om.net>,
	"Paul Walmsley" <paul@...an.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Chen-Yu Tsai <wens@...e.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"bcm-kernel-feedback-list@...adcom.com" 
	<bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH v4 1/5] dt-bindings: add SMP enable-method for Broadcom
 NSP

Hi Rob,

On 12/6/2015 6:22 AM, Rob Herring wrote:
> On Wed, Dec 2, 2015 at 10:06 AM, Kapil Hali <kapilh@...adcom.com> wrote:
>> Hi Rob,
>>
>> On 12/2/2015 8:56 PM, Rob Herring wrote:
>>> On Tue, Dec 01, 2015 at 11:24:05AM -0500, Kapil Hali wrote:
>>>> Add a compatible string "brcm,bcm-nsp-smp" for Broadcom's
>>>> Northstar Plus CPU to the 32-bit ARM CPU device tree binding
>>>> documentation file and create a new binding documentation for
>>>> Northstar Plus CPU.
>>>>
>>>> Signed-off-by: Kapil Hali <kapilh@...adcom.com>
>>>> ---
>>>>  .../bindings/arm/bcm/brcm,nsp-cpu-method.txt       | 39 ++++++++++++++++++++++
>>>>  Documentation/devicetree/bindings/arm/cpus.txt     |  1 +
>>>>  2 files changed, 40 insertions(+)
>>>>  create mode 100644 Documentation/devicetree/bindings/arm/bcm/brcm,nsp-cpu-method.txt
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/arm/bcm/brcm,nsp-cpu-method.txt b/Documentation/devicetree/bindings/arm/bcm/brcm,nsp-cpu-method.txt
>>>> new file mode 100644
>>>> index 0000000..bf08872
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/arm/bcm/brcm,nsp-cpu-method.txt
>>>> @@ -0,0 +1,39 @@
>>>> +Broadcom Northstar Plus SoC CPU Enable Method
>>>> +---------------------------------------------
>>>> +This binding defines the enable method used for starting secondary
>>>> +CPUs in the following Broadcom SoCs:
>>>> +  BCM58522, BCM58525, BCM58535, BCM58622, BCM58623, BCM58625, BCM88312
>>>> +
>>>> +The enable method is specified by defining the following required
>>>> +properties in the "cpus" device tree node:
>>>> +  - enable-method = "brcm,bcm-nsp-smp";
>>>> +  - secondary-boot-reg = <...>;
>>>
>>> Both of these are supposed to be per cpu core.
>>
>> 'enable-method' if not found in 'cpu' node is looked at in the 'cpus'
>> node. Except for two-three SoC families, 'enable-method' is within
>> 'cpus' node. Is my interpretation incorrect? Did I miss anything here?
> 
> I'm not sure how you counted, but it is much more than 2-3 that are
> correct (including all of PPC). It is quite mixed in dts files, but it
> is documented to be per cpu node, so lets follow the documentation
> please.
> 
> Rob
> 
I looked at arch/arm/* and not other arch types. But, as you said, let
us keep it how it is in documentation and I have already updated latest
patch set reflecting this change.

Thanks,
Kapil
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