linux-kernel - Re: [PATCH 2/5] dt-bindings: add Canaan K230 boards compatible strings

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Message-ID: <20240304-wharf-safely-8167b9641821@wendy>
Date: Mon, 4 Mar 2024 10:11:45 +0000
From: Conor Dooley <conor.dooley@...rochip.com>
To: Yangyu Chen <cyy@...self.name>
CC: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	<linux-riscv@...ts.infradead.org>, Conor Dooley <conor@...nel.org>, Rob
 Herring <robh+dt@...nel.org>, Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>, Paul Walmsley
	<paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, Albert Ou
	<aou@...s.berkeley.edu>, Guo Ren <guoren@...nel.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/5] dt-bindings: add Canaan K230 boards compatible
 strings

On Mon, Mar 04, 2024 at 04:51:05PM +0800, Yangyu Chen wrote:
> On 2024/3/4 16:11, Krzysztof Kozlowski wrote:
> > On 03/03/2024 14:26, Yangyu Chen wrote:
> > > Since K230 was released, K210 is no longer the only SoC in the Kendryte
> > > series, so remove the K210 string from the description. Also, add two
> > > boards based on k230 to compatible strings to allow them to be used in the
> > > dt.
> > > 
> > > Signed-off-by: Yangyu Chen <cyy@...self.name>
> > > ---
> > >   Documentation/devicetree/bindings/riscv/canaan.yaml | 13 ++++++++++++-
> > >   1 file changed, 12 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/riscv/canaan.yaml b/Documentation/devicetree/bindings/riscv/canaan.yaml
> > > index 41fd11f70a49..444758db964e 100644
> > > --- a/Documentation/devicetree/bindings/riscv/canaan.yaml
> > > +++ b/Documentation/devicetree/bindings/riscv/canaan.yaml
> > > @@ -10,7 +10,7 @@ maintainers:
> > >     - Damien Le Moal <dlemoal@...nel.org>
> > >   description:
> > > -  Canaan Kendryte K210 SoC-based boards
> > > +  Canaan Kendryte SoC-based boards
> > >   properties:
> > >     $nodename:
> > > @@ -42,6 +42,17 @@ properties:
> > >         - items:
> > >             - const: canaan,kendryte-k210
> > > +      - items:
> > > +          - const: canaan,k230-usip-lp3-evb
> > > +          - const: canaan,kendryte-k230
> > > +
> > > +      - items:
> > > +          - const: canaan,canmv-k230
> > 
> > Why this is not part of previous entry in an enum?
> > 
> > > +          - const: canaan,kendryte-k230
> > > +
> > > +      - items:
> > > +          - const: canaan,kendryte-k230
> > 
> > Usually you cannot run SoCs alone. What does it represent (in real life)?
> > 
> 
> I'm not sure what it means.

You have a SoC compatible but no board compatible. You cannot run a SoC
without some sort of board connected to it, so this should be removed.

> If you wonder why should I add a compatible string for soc, that is although
> we cannot run SoCs alone, adding a soc compatible will allow some
> bootloaders or SBI on RISC-V to choose an errata for a soc. Such as this
> opensbi patch. [1]

You don't need to add an isolated compatible like this to be able to
apply that "erratum", the compatible is already documented from the
"usip-l3-evb" and "canmv-k230" entries.

> If you wonder why I should allow a soc-compatible string with soc alone,
> that is because k210 did it previously.

The k210 is not really a beacon of quality in the DT department, copying
from there is likely to be misleading unfortunately.

> And provide a k210_generic.dts to
> use it. I haven't provided generic dts now but allowing only soc-compatible
> string alone would also be acceptable I think.

To be honest, I would like to delete the generic dts for the k210, I
don't think it should exist, at least not in the current form.

Thanks,
Conor.

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