linux-kernel - Re: [PATCH] riscv: dts: canaan: k230: Add "b" ISA extension

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Message-ID: <20260119-parcel-overtly-2621c4069f13@spud>
Date: Mon, 19 Jan 2026 18:13:04 +0000
From: Conor Dooley <conor@...nel.org>
To: Junhui Liu <junhui.liu@...moral.tech>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] riscv: dts: canaan: k230: Add "b" ISA extension

On Sun, Jan 18, 2026 at 10:25:07PM +0800, Junhui Liu wrote:
> "b" is ratified (Apr/2024) much later than its components zba/zbb/zbs
> (Jun/2021). With "b" added into riscv/extensions.yaml, a dependency
> checking rule is now enforced, which requires that when zba, zbb, and zbs
> are all specified, "b" must be added as well. Failing to do this will
> cause dtbs_check schema check warnings.
> 
> According to uabi.rst, as a single-letter extension, "b" should be added
> after "c" in canonical order.
> 
> Update k230.dtsi to conform to this rule. Also synchronize "riscv,isa"
> with "riscv,isa-extensions".
> 
> Signed-off-by: Junhui Liu <junhui.liu@...moral.tech>
> ---
> Based on Conor's k230-basic branch and rebased to riscv-dt-for-next.
> 
> The commit message and implementation are adapted from Guodong's patch
> for adding the "b" ISA extension to multiple dtsi files.

Applied to my k230-basic branch.

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