linux-kernel - Re: [PATCH] dt-bindings: riscv: Add SiFive vendor extensions description

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Message-ID: <CAKddAkDM_-w-y9bcHj+5-afDBhd1rbV-x2JZorE8S9k0u3JSxw@mail.gmail.com>
Date: Thu, 10 Jul 2025 12:57:59 +0800
From: Nick Hu <nick.hu@...ive.com>
To: Conor Dooley <conor@...nel.org>
Cc: Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...ive.com>, 
	linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>
Subject: Re: [PATCH] dt-bindings: riscv: Add SiFive vendor extensions description

On Thu, Jul 10, 2025 at 12:00 AM Conor Dooley <conor@...nel.org> wrote:
>
> On Tue, Jul 08, 2025 at 02:52:42PM +0800, Nick Hu wrote:
> > Add description for SiFive vendor extensions "xsfcflushdlone",
> > "xsfpgflushdlone" and "xsfcease".
> >
> > Signed-off-by: Nick Hu <nick.hu@...ive.com>
>
> You have this, but no user or anything along with it. What's actually
> making use of this? If it's just for the SBI impl or w/e then say that.
>
It's for the SBI implementation. I'll update it in the commit message.
Thanks!

Best Regard,
Nick

> > ---
> >  .../devicetree/bindings/riscv/extensions.yaml  | 18 ++++++++++++++++++
> >  1 file changed, 18 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml
> > index 72c1b063fdfe..10c37c61243d 100644
> > --- a/Documentation/devicetree/bindings/riscv/extensions.yaml
> > +++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
> > @@ -626,6 +626,24 @@ properties:
> >              https://www.andestech.com/wp-content/uploads/AX45MP-1C-Rev.-5.0.0-Datasheet.pdf
> >
> >          # SiFive
> > +        - const: xsfcease
> > +          description:
> > +            SiFive CEASE Instruction Extensions Specification.
> > +            See more details in
> > +            https://www.sifive.com/document-file/freedom-u740-c000-manual
> > +
> > +        - const: xsfcflushdlone
> > +          description:
> > +            SiFive L1D Cache Flush Instruction Extensions Specification.
> > +            See more details in
> > +            https://www.sifive.com/document-file/freedom-u740-c000-manual
> > +
> > +        - const: xsfpgflushdlone
> > +          description:
> > +            SiFive PGFLUSH Instruction Extensions for the power management. The
> > +            CPU will flush the L1D and enter the cease state after executing
> > +            the instruction.
> > +
> >          - const: xsfqmaccdod
> >            description:
> >              SiFive Int8 Matrix Multiplication Extensions Specification.
> > --
> > 2.17.1
> >