linux-kernel - [PATCH v3 6/6] dt-bindings: riscv: document vector crypto requirements

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Message-ID: <20250205-ludicrous-gratify-b2ae27b95ebd@spud>
Date: Wed,  5 Feb 2025 16:05:12 +0000
From: Conor Dooley <conor@...nel.org>
To: linux-riscv@...ts.infradead.org
Cc: conor@...nel.org,
	Conor Dooley <conor.dooley@...rochip.com>,
	Eric Biggers <ebiggers@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Clément Léger <cleger@...osinc.com>,
	Andy Chiu <andybnac@...il.com>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v3 6/6] dt-bindings: riscv: document vector crypto requirements

From: Conor Dooley <conor.dooley@...rochip.com>

Section 35.2. Extensions Overview of [1] says:
| The Zvknhb and Zvbc Vector Crypto Extensions --and accordingly the composite extensions Zvkn and
| Zvks-- (sic) require a Zve64x base, or application ("V") base Vector Extension.
| All of the other Vector Crypto Extensions can be built on any embedded (Zve*) or application ("V") base
| Vector Extension

Eric Biggars pointed out that the spec is actually incorrect, and that
the list of instructions requiring a Zve64x base is actually: Zvkn,
Zvknc, Zvkng and Zvksc. Implement the rules according to his PR [2].

Link: https://github.com/riscv/riscv-isa-manual/releases/tag/riscv-isa-release-698e64a-2024-09-09 [1]
Link: https://github.com/riscv/riscv-isa-manual/pull/1697 [2]
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
---
 .../devicetree/bindings/riscv/extensions.yaml | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml
index 02065664f819..9aeb9d4731ca 100644
--- a/Documentation/devicetree/bindings/riscv/extensions.yaml
+++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
@@ -726,6 +726,39 @@ properties:
             - contains:
                 const: zve64f
 
+      - if:
+          contains:
+            anyOf:
+              - const: zvbc
+              - const: zvkn
+              - const: zvknc
+              - const: zvkng
+              - const: zvknhb
+              - const: zvksc
+        then:
+          contains:
+            anyOf:
+              - const: v
+              - const: zve64x
+
+      - if:
+          contains:
+            anyOf:
+              - const: zvbb
+              - const: zvkb
+              - const: zvkg
+              - const: zvkned
+              - const: zvknha
+              - const: zvksed
+              - const: zvksh
+              - const: zvks
+              - const: zvkt
+        then:
+          contains:
+            anyOf:
+              - const: v
+              - const: zve32x
+
 allOf:
   # Zcf extension does not exist on rv64
   - if:
-- 
2.45.2