linux-kernel - Re: [RFC v1 5/5] dt-bindings: riscv: document vector crypto requirements

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Message-ID: <20241003-variable-quirk-9a13fe040e4a@spud>
Date: Thu, 3 Oct 2024 12:05:30 +0100
From: Conor Dooley <conor@...nel.org>
To: Clément Léger <cleger@...osinc.com>
Cc: linux-riscv@...ts.infradead.org,
	Conor Dooley <conor.dooley@...rochip.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>, Andy Chiu <andybnac@...il.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC v1 5/5] dt-bindings: riscv: document vector crypto
 requirements

On Thu, Oct 03, 2024 at 09:59:38AM +0200, Clément Léger wrote:
> 
> 
> On 02/10/2024 18:10, Conor Dooley wrote:
> > From: Conor Dooley <conor.dooley@...rochip.com>
> > 
> > Section 35.2. Extensions Overview of [1] says:
> > | The Zvknhb and Zvbc Vector Crypto Extensions --and accordingly the composite extensions Zvkn and
> > | Zvks-- (sic) require a Zve64x base, or application ("V") base Vector Extension.
> > | All of the other Vector Crypto Extensions can be built on any embedded (Zve*) or application ("V") base
> > | Vector Extension
> > 
> > Apply these rules in the binding, so that invalid combinations can be
> > avoided.
> > 
> > Link: https://github.com/riscv/riscv-isa-manual/releases/tag/riscv-isa-release-698e64a-2024-09-09 [1]
> > Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> > ---
> >  .../devicetree/bindings/riscv/extensions.yaml | 32 +++++++++++++++++++
> >  1 file changed, 32 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml
> > index abf2579171c5b..02b822bbf341d 100644
> > --- a/Documentation/devicetree/bindings/riscv/extensions.yaml
> > +++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
> > @@ -651,6 +651,38 @@ properties:
> >              - contains:
> >                  const: zve64f
> >  
> > +      - if:
> > +          contains:
> > +            anyOf:
> > +              - const: zvbc
> > +              - const: zvkn
> > +              - const: zvknhb
> > +              - const: zvks
> 
> Shouldn't zvksed and zvksh be part odf this list ? My understanding of
> the spec might be wrong but "Zvks--" seems like a poor-man's wildcard
> for Zvks* extensions ?

I don't think so, there's a corresponding -- on the first line of the
quote. I think it is some really odd styling that should be replaced by
commas.


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