As riscv-debug-spec [1] Chapter 5 introduce Sdtrig extension.

Add an entry for the Sdtrig extension to the riscv,isa-extensions property.

Link: 
https://github.com/riscv/riscv-debug-spec/releases/download/ar20231208/riscv-debug-stable.pdf
 [1]
Signed-off-by: Max Hsu <[email protected]>
---
 Documentation/devicetree/bindings/riscv/extensions.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml 
b/Documentation/devicetree/bindings/riscv/extensions.yaml
index 468c646247aa..47d82cd35ca7 100644
--- a/Documentation/devicetree/bindings/riscv/extensions.yaml
+++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
@@ -121,6 +121,13 @@ properties:
             version of the privileged ISA specification.
 
         # multi-letter extensions, sorted alphanumerically
+        - const: sdtrig
+          description: |
+            The standard Sdtrig extension for introduce trigger CSRs for
+            cause a breakpoint exception, entry into Debug Mode,
+            or trace action as frozen at commit 359bedc ("Freeze Candidate")
+            of riscv-debug-spec
+
         - const: smaia
           description: |
             The standard Smaia supervisor-level extension for the advanced

-- 
2.43.2


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