linux-kernel - [PATCH v2 01/12] dt-bindings: riscv: add Zca, Zcf, Zcd and Zcb ISA extension description

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Date: Thu, 18 Apr 2024 14:42:24 +0200
From: Clément Léger <cleger@...osinc.com>
To: Jonathan Corbet <corbet@....net>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Conor Dooley <conor@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Anup Patel <anup@...infault.org>,
	Shuah Khan <shuah@...nel.org>
Cc: Clément Léger <cleger@...osinc.com>,
	Atish Patra <atishp@...shpatra.org>,
	linux-doc@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	kvm@...r.kernel.org,
	kvm-riscv@...ts.infradead.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH v2 01/12] dt-bindings: riscv: add Zca, Zcf, Zcd and Zcb ISA extension description

Add description for Zca, Zcf, Zcd and Zcb extensions which are part the
Zc* standard extensions for code size reduction. Additional validation
rules are added since Zcb depends on Zca, Zcf, depends on Zca and F, Zcd
depends on Zca and D and finally, Zcf can not be present on rv64.

Signed-off-by: Clément Léger <cleger@...osinc.com>
---
 .../devicetree/bindings/riscv/extensions.yaml | 78 +++++++++++++++++++
 1 file changed, 78 insertions(+)

diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml
index 616370318a66..db7daf22b863 100644
--- a/Documentation/devicetree/bindings/riscv/extensions.yaml
+++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
@@ -220,6 +220,38 @@ properties:
             instructions as ratified at commit 6d33919 ("Merge pull request #158
             from hirooih/clmul-fix-loop-end-condition") of riscv-bitmanip.
 
+        - const: zca
+          description: |
+            The Zca extension part of Zc* standard extensions for code size
+            reduction, as ratified in commit 8be3419c1c0 ("Zcf doesn't exist on
+            RV64 as it contains no instructions") of riscv-code-size-reduction,
+            merged in the riscv-isa-manual by commit dbc79cf28a2 ("Initial seed
+            of zc.adoc to src tree.").
+
+        - const: zcb
+          description: |
+            The Zcb extension part of Zc* standard extensions for code size
+            reduction, as ratified in commit 8be3419c1c0 ("Zcf doesn't exist on
+            RV64 as it contains no instructions") of riscv-code-size-reduction,
+            merged in the riscv-isa-manual by commit dbc79cf28a2 ("Initial seed
+            of zc.adoc to src tree.").
+
+        - const: zcd
+          description: |
+            The Zcd extension part of Zc* standard extensions for code size
+            reduction, as ratified in commit 8be3419c1c0 ("Zcf doesn't exist on
+            RV64 as it contains no instructions") of riscv-code-size-reduction,
+            merged in the riscv-isa-manual by commit dbc79cf28a2 ("Initial seed
+            of zc.adoc to src tree.").
+
+        - const: zcf
+          description: |
+            The Zcf extension part of Zc* standard extensions for code size
+            reduction, as ratified in commit 8be3419c1c0 ("Zcf doesn't exist on
+            RV64 as it contains no instructions") of riscv-code-size-reduction,
+            merged in the riscv-isa-manual by commit dbc79cf28a2 ("Initial seed
+            of zc.adoc to src tree.").
+
         - const: zfa
           description:
             The standard Zfa extension for additional floating point
@@ -489,5 +521,51 @@ properties:
             Registers in the AX45MP datasheet.
             https://www.andestech.com/wp-content/uploads/AX45MP-1C-Rev.-5.0.0-Datasheet.pdf
 
+    allOf:
+      # Zcb depends on Zca
+      - if:
+          contains:
+            const: zcb
+        then:
+          contains:
+            const: zca
+      # Zcd depends on Zca and D
+      - if:
+          contains:
+            const: zcd
+        then:
+          allOf:
+            - contains:
+                const: zca
+            - contains:
+                const: d
+      # Zcf depends on Zca and F
+      - if:
+          contains:
+            const: zcf
+        then:
+          allOf:
+            - contains:
+                const: zca
+            - contains:
+                const: f
+
+allOf:
+  # Zcf extension does not exists on rv64
+  - if:
+      properties:
+        riscv,isa-extensions:
+          contains:
+            const: zcf
+        riscv,isa-base:
+          contains:
+            const: rv64i
+    then:
+      properties:
+        riscv,isa-extensions:
+          not:
+            contains:
+              const: zcf
+
 additionalProperties: true
 ...
-- 
2.43.0