linux-kernel - [RFC v1 4/5] dt-bindings: riscv: add vector sub-extension dependencies

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Message-ID: <20241002-eagle-fresh-4b2e259e45ee@spud>
Date: Wed,  2 Oct 2024 17:10:57 +0100
From: Conor Dooley <conor@...nel.org>
To: linux-riscv@...ts.infradead.org
Cc: conor@...nel.org,
	Conor Dooley <conor.dooley@...rochip.com>,
	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
Subject: [RFC v1 4/5] dt-bindings: riscv: add vector sub-extension dependencies

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

Section 33.18.2. Zve*: Vector Extensions for Embedded Processors
in [1] says:
| The Zve32f and Zve64x extensions depend on the Zve32x extension. The Zve64f extension depends
| on the Zve32f and Zve64x extensions. The Zve64d extension depends on the Zve64f extension

| The Zve32x extension depends on the Zicsr extension. The Zve32f and Zve64f extensions depend
| upon the F extension

| The Zve64d extension depends upon the D extension

Apply these rules to the bindings to help prevent invalid combinations.

Link: https://github.com/riscv/riscv-isa-manual/releases/tag/riscv-isa-release-698e64a-2024-09-09 [1]
Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
---
 .../devicetree/bindings/riscv/extensions.yaml | 46 +++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml
index 779f5cfab806e..abf2579171c5b 100644
--- a/Documentation/devicetree/bindings/riscv/extensions.yaml
+++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
@@ -605,6 +605,52 @@ properties:
           contains:
             const: zca
 
+      - if:
+          contains:
+            const: zve32x
+        then:
+          contains:
+            const: zicsr
+
+      - if:
+          contains:
+            const: zve32f
+        then:
+          allOf:
+            - contains:
+                const: f
+            - contains:
+                const: zve32x
+
+      - if:
+          contains:
+            const: zve64x
+        then:
+          contains:
+            const: zve32x
+
+      - if:
+          contains:
+            const: zve64f
+        then:
+          allOf:
+            - contains:
+                const: f
+            - contains:
+                const: zve32f
+            - contains:
+                const: zve64x
+
+      - if:
+          contains:
+            const: zve64d
+        then:
+          allOf:
+            - contains:
+                const: d
+            - contains:
+                const: zve64f
+
 allOf:
   # Zcf extension does not exist on rv64
   - if:
-- 
2.45.2