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

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Message-Id: <20260118-k230-ext-b-v1-1-6a63616b11cc@pigmoral.tech>
Date: Sun, 18 Jan 2026 22:25:07 +0800
From: Junhui Liu <junhui.liu@...moral.tech>
To: Conor Dooley <conor@...nel.org>, 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>
Cc: linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Junhui Liu <junhui.liu@...moral.tech>
Subject: [PATCH] riscv: dts: canaan: k230: Add "b" ISA extension

"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.
---
 arch/riscv/boot/dts/canaan/k230.dtsi | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/boot/dts/canaan/k230.dtsi b/arch/riscv/boot/dts/canaan/k230.dtsi
index 5a1bf8a15abe..041c9947a8fa 100644
--- a/arch/riscv/boot/dts/canaan/k230.dtsi
+++ b/arch/riscv/boot/dts/canaan/k230.dtsi
@@ -21,9 +21,9 @@ cpu@0 {
 			compatible = "thead,c908", "riscv";
 			device_type = "cpu";
 			reg = <0>;
-			riscv,isa = "rv64imafdcv_zicbom_zicbop_zicboz_zfh_zba_zbb_zbc_zbs_zvfh_svpbmt";
+			riscv,isa = "rv64imafdcbv_zicbom_zicbop_zicboz_zicntr_zicsr_zifencei_zihpm_zfh_zba_zbb_zbc_zbs_zvfh_svpbmt";
 			riscv,isa-base = "rv64i";
-			riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "v", "zicbom",
+			riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "b", "v", "zicbom",
 					       "zicbop", "zicboz", "zicntr", "zicsr", "zifencei",
 					       "zihpm", "zfh", "zba", "zbb", "zbc", "zbs", "zvfh",
 					       "svpbmt";

---
base-commit: 99a8c0e33dbf0117710b7f0c5cd1cb39638235ab
change-id: 20260118-k230-ext-b-0d7e7c77c38f

Best regards,
-- 
Junhui Liu <junhui.liu@...moral.tech>