[v5,10/21] dt-bindings: riscv: add Counter delegation ISA extensions description

Commit Message

Atish Patra March 27, 2025, 7:35 p.m. UTC

Add description for the Smcdeleg/Ssccfg extension.

Signed-off-by: Atish Patra <[e-mail]>
---
 .../devicetree/bindings/riscv/extensions.yaml      | 45 ++++++++++++++++++++++
 1 file changed, 45 insertions(+)

Patch

diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml
index c2025949295f..f34bc66940c0 100644
--- a/Documentation/devicetree/bindings/riscv/extensions.yaml
+++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
@@ -128,6 +128,13 @@  properties:
             changes to interrupts as frozen at commit ccbddab ("Merge pull
             request #42 from riscv/jhauser-2023-RC4") of riscv-aia.
 
+        - const: smcdeleg
+          description: |
+            The standard Smcdeleg supervisor-level extension for the machine mode
+            to delegate the hpmcounters to supvervisor mode so that they are
+            directlyi accessible in the supervisor mode as ratified in the
+            20240213 version of the privileged ISA specification.
+
         - const: smcsrind
           description: |
             The standard Smcsrind supervisor-level extension extends the
@@ -175,6 +182,14 @@  properties:
             behavioural changes to interrupts as frozen at commit ccbddab
             ("Merge pull request #42 from riscv/jhauser-2023-RC4") of riscv-aia.
 
+        - const: ssccfg
+          description: |
+            The standard Ssccfg supervisor-level extension for configuring
+            the delegated hpmcounters to be accessible directly in supervisor
+            mode as ratified in the 20240213 version of the privileged ISA
+            specification. This extension depends on Sscsrind, Smcdeleg, Zihpm,
+            Zicntr extensions.
+
         - const: sscofpmf
           description: |
             The standard Sscofpmf supervisor-level extension for count overflow
@@ -695,6 +710,36 @@  properties:
         then:
           contains:
             const: zca
+      # Smcdeleg depends on Sscsrind, Zihpm, Zicntr
+      - if:
+          contains:
+            const: smcdeleg
+        then:
+          allOf:
+            - contains:
+                const: sscsrind
+            - contains:
+                const: zihpm
+            - contains:
+                const: zicntr
+      # Ssccfg depends on Smcdeleg, Sscsrind, Zihpm, Zicntr, Sscofpmf, Smcntrpmf
+      - if:
+          contains:
+            const: ssccfg
+        then:
+          allOf:
+            - contains:
+                const: smcdeleg
+            - contains:
+                const: sscsrind
+            - contains:
+                const: sscofpmf
+            - contains:
+                const: smcntrpmf
+            - contains:
+                const: zihpm
+            - contains:
+                const: zicntr
 
 allOf:
   # Zcf extension does not exist on rv64