linux-kernel - Re: [PATCH 05/11] dt-bindings: mips: cpu: Add I-Class I6500 Multiprocessor Core

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Date:   Mon, 09 Oct 2023 17:32:57 +0200
From:   Gregory CLEMENT <gregory.clement@...tlin.com>
To:     Rob Herring <robh@...nel.org>, Arnd Bergmann <arnd@...db.de>
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Phil Mathieu-Daudé 
        <philmd@...aro.org>, Paul Burton <paulburton@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Vladimir Kondratiev <vladimir.kondratiev@...el.com>,
        Tawfik Bayouk <tawfik.bayouk@...ileye.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Théo Lebrun <theo.lebrun@...tlin.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 05/11] dt-bindings: mips: cpu: Add I-Class I6500
 Multiprocessor Core

Rob Herring <robh@...nel.org> writes:

> On Fri, Oct 06, 2023 at 12:48:03PM +0200, Arnd Bergmann wrote:
>> On Thu, Oct 5, 2023, at 16:51, Gregory CLEMENT wrote:
>> >> On Wed, Oct 04, 2023 at 06:10:32PM +0200, Gregory CLEMENT wrote:
>> >>> The MIPS Warrior I-class I6500 was announced by Imagination
>> >>> Technologies in 2016 and is used in the Mobileye SoC EyeQ5.
>> >>> 
>> >>> Signed-off-by: Gregory CLEMENT <gregory.clement@...tlin.com>
>> >>> ---
>> >>>  Documentation/devicetree/bindings/mips/cpus.yaml | 1 +
>> >>>  1 file changed, 1 insertion(+)
>> >>> 
>> >>> diff --git a/Documentation/devicetree/bindings/mips/cpus.yaml b/Documentation/devicetree/bindings/mips/cpus.yaml
>> >>> index cf382dea3922..87fd2842ba68 100644
>> >>> --- a/Documentation/devicetree/bindings/mips/cpus.yaml
>> >>> +++ b/Documentation/devicetree/bindings/mips/cpus.yaml
>> >>> @@ -39,6 +39,7 @@ properties:
>> >>>        - mti,mips24KEc
>> >>>        - mti,mips14KEc
>> >>>        - mti,mips14Kc
>> >>
>> >>> +      - mti,i6500
>> >>
>> >> Since the CPU core vendor is Imagination Technologies thus it would
>> >> be more appropriate to have the "img," prefix. Wouldn't it?
>> >
>> > According to Documentation/devicetree/bindings/vendor-prefixes.yaml
>> >
>> > "^mti,.*":
>> >     description: Imagination Technologies Ltd. (formerly MIPS
>> >     Technologies Inc.)
>> >
>> > So I think it's OK.
>> 
>> I don't see any good solution, they changed their name and
>> ownership too many times. I would actually revert back the
>> description here to "MIPS Technologies Inc" instead of trying
>> to keep track of what they currently call themselves.
>> 
>> Since we already have both the 'mips,' and 'mti,' vendow
>> names for the 14Kc, 14KEc and 24KEc parts, maybe we can
>> just go back to 'mips,' for all cores past the mti era
>> rather than trying to date and geolocate each of the
>> classic cores as one of 'mti', 'img', 'wavecomp', 'tallwood',
>> 'mips' 'cipunited' etc.
>
> I would reserve 'mips' for anything common. Much like 'riscv' is only 
> for things based on RiscV specs/standards.
>
> I would use 'img' here if we know this was designed/implemented by 
> Imagination.

If there is no objection I will use 'img' then.

Gregory

>
> Rob

-- 
Gregory Clement, Bootlin
Embedded Linux and Kernel engineering
http://bootlin.com