linux-kernel - Re: [PATCH 3/5] riscv: dts: add initial T-HEAD light SoC device tree

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Date:   Sun, 21 May 2023 18:08:32 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Guo Ren <guoren@...nel.org>
Cc:     Jisheng Zhang <jszhang@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org, heiko@...ech.de
Subject: Re: [PATCH 3/5] riscv: dts: add initial T-HEAD light SoC device tree

On Sun, May 21, 2023 at 11:37:58PM +0800, Guo Ren wrote:
> On Tue, May 9, 2023 at 12:44 AM Conor Dooley <conor@...nel.org> wrote:
> >
> > On Tue, May 09, 2023 at 12:26:10AM +0800, Jisheng Zhang wrote:
> > > On Sun, May 07, 2023 at 10:35:12PM +0100, Conor Dooley wrote:
> > > > On Mon, May 08, 2023 at 02:23:02AM +0800, Jisheng Zhang wrote:
> > > >
> > > > > +         c910_0: cpu@0 {
> > > > > +                 compatible = "thead,c910", "riscv";
> > > > > +                 device_type = "cpu";
> > > > > +                 riscv,isa = "rv64imafdc";
> > > >
> > > > Does this support more than "rv64imafdc"?
> > > > I assume there's some _xtheadfoo extensions that it does support,
> > > > although I am not sure how we are proceeding with those - Heiko might
> > > > have a more nuanced take.
> > > >
> > > > > +         reset: reset-sample {
> > > > > +                 compatible = "thead,reset-sample";
> > > >
> > > > What is a "reset-sample"?
> > >
> > > This node is only for opensbi. The compatible string is already in
> > > opensbi. Do we also need to add dt-binding for it in linux?
> >
> > If it's to be included in the kernel's dts, then yes, you do need a
> > dt-binding. If you remove it, then you don't :)
> >
> > That said, "thead,reset-sample" is a strangely named compatible, so if
> > you do keep it it may end up needing a rename!

> How about compatible = "thead,reset-th1520" ?

"vendor,soc-function" is more typical, but "reset" is usually used for
reset controllers of which this isn't as far as I can tell.
I commented on the v2, hoping that you might actually know what the IP
block' full/proper name is:
https://lore.kernel.org/all/20230518-driving-secluding-793b3192776e@spud/

Do you?

Cheers,
Conor.

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