linux-kernel - Re: [PATCH -fixes v2 2/4] dt-bindings: riscv: Add ratified privileged ISA versions

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Message-Id: <31024f04-e3e0-4bf9-beca-ebcd4f6fe51b@app.fastmail.com>
Date: Tue, 13 Feb 2024 12:42:37 -0500
From: "Stefan O'Rear" <sorear@...tmail.com>
To: "Conor Dooley" <conor@...nel.org>,
 "Samuel Holland" <samuel.holland@...ive.com>
Cc: "Palmer Dabbelt" <palmer@...belt.com>,
 "Andrew Jones" <ajones@...tanamicro.com>, linux-riscv@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH -fixes v2 2/4] dt-bindings: riscv: Add ratified privileged ISA
 versions

On Tue, Feb 13, 2024, at 12:03 PM, Conor Dooley wrote:
> On Mon, Feb 12, 2024 at 07:37:33PM -0800, Samuel Holland wrote:
>> The baseline for the RISC-V privileged ISA is version 1.10. Using
>> features from newer versions of the privileged ISA requires the
>> supported version to be reported by platform firmware, either in the ISA
>> string (where the binding already accepts version numbers) or in the
>> riscv,isa-extensions property. So far two newer versions are ratified.
>> 
>> Signed-off-by: Samuel Holland <samuel.holland@...ive.com>
>> ---
>> 
>> Changes in v2:
>>  - New patch for v2
>> 
>>  .../devicetree/bindings/riscv/extensions.yaml | 20 +++++++++++++++++++
>>  1 file changed, 20 insertions(+)
>> 
>> diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml
>> index 63d81dc895e5..7faf22df01af 100644
>> --- a/Documentation/devicetree/bindings/riscv/extensions.yaml
>> +++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
>> @@ -121,6 +121,16 @@ properties:
>>              version of the privileged ISA specification.
>>  
>>          # multi-letter extensions, sorted alphanumerically
>
>> +        - const: sm1p11
>
> Why are we beholden to this "1p11" format of RVI's? We have free choice
> of characters here, what's stopping us using "machine-v1.11", for
> example?
>
> Thanks,
> Conor.

I'd prefer to use names that are at least somewhat recognizable, e.g. in
the profiles spec, rather than making up something from whole cloth.

-s

>
>> +          description:
>> +            The standard Machine ISA v1.11, as ratified in the 20190608
>> +            version of the privileged ISA specification.
>> +
>> +        - const: sm1p12
>> +          description:
>> +            The standard Machine ISA v1.12, as ratified in the 20211203
>> +            version of the privileged ISA specification.
>> +
>>          - const: smaia
>>            description: |
>>              The standard Smaia supervisor-level extension for the advanced
>> @@ -134,6 +144,16 @@ properties:
>>              added by other RISC-V extensions in H/S/VS/U/VU modes and as
>>              ratified at commit a28bfae (Ratified (#7)) of riscv-state-enable.
>>  
>> +        - const: ss1p11
>> +          description:
>> +            The standard Supervisor ISA v1.11, as ratified in the 20190608
>> +            version of the privileged ISA specification.
>> +
>> +        - const: ss1p12
>> +          description:
>> +            The standard Supervisor ISA v1.12, as ratified in the 20211203
>> +            version of the privileged ISA specification.
>> +
>>          - const: ssaia
>>            description: |
>>              The standard Ssaia supervisor-level extension for the advanced
>> -- 
>> 2.43.0
>> 
>> 
>> _______________________________________________
>> linux-riscv mailing list
>> linux-riscv@...ts.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-riscv
>
> Attachments:
> * signature.asc

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