linux-kernel - Re: [PATCH v2 1/4] dt-bindings: vendor-prefixes: Add prefix for XuanTie

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Message-ID: <88bfaf9f-4483-4bcd-b3a8-de453ce6417f@kernel.org>
Date: Fri, 21 Nov 2025 18:22:31 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Guo Ren <guoren@...nel.org>, Conor Dooley <conor@...nel.org>
Cc: cp0613@...ux.alibaba.com, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, pjw@...nel.org, palmer@...belt.com,
 aou@...s.berkeley.edu, peterz@...radead.org, mingo@...hat.com,
 acme@...nel.org, namhyung@...nel.org, mark.rutland@....com,
 alexander.shishkin@...ux.intel.com, jolsa@...nel.org, irogers@...gle.com,
 adrian.hunter@...el.com, james.clark@...aro.org, devicetree@...r.kernel.org,
 linux-perf-users@...r.kernel.org, linux-riscv@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] dt-bindings: vendor-prefixes: Add prefix for
 XuanTie

On 21/11/2025 14:01, Guo Ren wrote:
> On Fri, Nov 21, 2025 at 8:31 PM Conor Dooley <conor@...nel.org> wrote:
>>
>> On Fri, Nov 21, 2025 at 10:01:07AM +0100, Krzysztof Kozlowski wrote:
>>> On Fri, Nov 21, 2025 at 02:34:36PM +0800, cp0613@...ux.alibaba.com wrote:
>>>> From: Chen Pei <cp0613@...ux.alibaba.com>
>>>>
>>>> Add new vendor strings to dt bindings for RISC-V vendor XuanTie.
>>>>
>>>> Signed-off-by: Chen Pei <cp0613@...ux.alibaba.com>
>>>> ---
>>>>  Documentation/devicetree/bindings/vendor-prefixes.yaml | 2 ++
>>>>  1 file changed, 2 insertions(+)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
>>>> index f1d1882009ba..5d28b2da94cd 100644
>>>> --- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
>>>> +++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
>>>> @@ -1829,6 +1829,8 @@ patternProperties:
>>>>      description: Xilinx
>>>>    "^xnano,.*":
>>>>      description: Xnano
>>>> +  "^xuantie,.*":
>>>> +    description: C-SKY Microsystems Co., Ltd. (XuanTie)
>>>
>>> We do not create new prefixes for existing entries. You have already
>>> csky, alibaba and thead and probably many more. Choose some appropriate.
> We could leave the one C-SKY vendor entry, how about:
> 
> --- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
> +++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
> @@ -347,8 +347,8 @@ patternProperties:
>      description: Creative Technology Ltd
>    "^crystalfontz,.*":
>      description: Crystalfontz America, Inc.
> -  "^csky,.*":
> -    description: Hangzhou C-SKY Microsystems Co., Ltd
> +  "^xuantie,.*":
> +    description: C-SKY Microsystems Co., Ltd. (XuanTie)
>    "^csot,.*":
>      description: Guangzhou China Star Optoelectronics Technology Co., Ltd
>    "^csq,.*":
> 
> The arch/csky is the architecture name, which means "xuantie,csky".
> 
> The c810 is the CPU product name, which means "xuantie,c810" of the
> "xuantie,csky" architecture.
> 
> The c930 is the CPU product name, which means "xuantie,c930".
> 
>>
>> When the vendor literally says "C-SKY", it's hard to buy why csky
>> shouldn't be used here. Xuantie is described as being a brand, where at
>> least t-head was a company. This seems akin to having
>> "snapdragon,msm8660" instead of "qcom,msm8660", for example.
> Yes, XuanTie is not only a brand, but also the abbreviation of C-SKY
> Microsystems Co., Ltd.

"XuanTie is a brand", so not suitable for vendor prefixes.

https://www.xrvm.com/declaration

What's more:

<<A reference to “C-SKY”, “we” or “us” is a reference to C-SKY
Microsystems Co., Ltd. of Room >>

So again c-sky.


Best regards,
Krzysztof