linux-kernel - Re: [PATCH 7/8] riscv: dts: spacemit: add initial device tree of SpacemiT K3 SoC

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Message-ID: <20251218-basil-quantum-225ce16e4699@spud>
Date: Thu, 18 Dec 2025 00:56:40 +0000
From: Conor Dooley <conor@...nel.org>
To: Heinrich Schuchardt <heinrich.schuchardt@...onical.com>
Cc: Guodong Xu <guodong@...cstar.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...ive.com>,
	Kevin Meng Zhang <zhangmeng.kevin@...ux.spacemit.com>,
	devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org, spacemit@...ts.linux.dev,
	linux-serial@...r.kernel.org, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Paul Walmsley <pjw@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	Yixun Lan <dlan@...too.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Samuel Holland <samuel.holland@...ive.com>,
	Anup Patel <anup@...infault.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>, Lubomir Rintel <lkundrak@...sk>,
	Yangyu Chen <cyy@...self.name>
Subject: Re: [PATCH 7/8] riscv: dts: spacemit: add initial device tree of
 SpacemiT K3 SoC

On Wed, Dec 17, 2025 at 09:07:14AM +0100, Heinrich Schuchardt wrote:
> On 12/17/25 08:11, Guodong Xu wrote:

> > Specifically, I must adhere to
> > Documentation/devicetree/bindings/riscv/extensions.yaml (and cpus.yaml for
> > properties like 'riscv,sv39' which stands for the extension Sv39). If I
> > add extension strings that are not yet defined in these schemas, such as
> > supm, running 'make dtbs_check W=3' fails with: 'supm' is not one of
> > ['i', 'm', 'a', ...], followed by "Unevaluated properties are not allowed."
> 
> If Documentation/devicetree/bindings/riscv/extensions.yaml is incomplete
> with respect to ratified extensions, I guess the right approach is to amend
> it and not to curtail the CPU description.

Absolutely. If the cpu supports something that is not documented, then
please document it rather than omit from the devicetree.

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