From: Guodong Xu <guodong@riscstar.com>
Date: Sat, 10 Jan 2026 05:18:19 +0000 (+0800)
Subject: dt-bindings: riscv: Add descriptions for Za64rs, Ziccamoa, Ziccif, and Zicclsm
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b321256a4f36227e0c1ae54e8c6c48524dcba83d;p=thirdparty%2Fkernel%2Flinux.git

dt-bindings: riscv: Add descriptions for Za64rs, Ziccamoa, Ziccif, and Zicclsm

Add descriptions for four extensions: Za64rs, Ziccamoa, Ziccif, and
Zicclsm. These extensions are ratified in RISC-V Profiles Version 1.0
(commit b1d806605f87 "Updated to ratified state.").

They are introduced as new extension names for existing features and
regulate implementation details for RISC-V Profile compliance. According
to RISC-V Profiles Version 1.0 and RVA23 Profiles Version 1.0, they are
mandatory for the following profiles:

 - za64rs: Mandatory in RVA22U64, RVA23U64
 - ziccamoa: Mandatory in RVA20U64, RVA22U64, RVA23U64
 - ziccif: Mandatory in RVA20U64, RVA22U64, RVA23U64
 - zicclsm: Mandatory in RVA20U64, RVA22U64, RVA23U64

Ziccrse specifies the main memory must support "RsrvEventual", which is
one (totally there are four) of the support level for Load-Reserved/
Store-Conditional (LR/SC) atomic instructions. Thus it depends on Zalrsc.

Ziccamoa specifies the main memory must support AMOArithmetic, among the
four levels of PMA support defined for AMOs in the A extension. Thus it
depends on Zaamo.

Za64rs defines reservation sets are contiguous, naturally aligned, and a
maximum of 64 bytes. Za64rs is consumed by two extensions: Zalrsc and
Zawrs. Zawrs itself depends on Zalrsc too.

Based on the relationship that  "A" = Zaamo + Zalrsc, add the following
dependencies checks:
 Za64rs -> Zalrsc or A
 Ziccrse -> Zalrsc or A
 Ziccamoa -> Zaamo or A

Signed-off-by: Guodong Xu <guodong@riscstar.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
---

diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml
index beeb6612db31a..e0bdd88bd24e2 100644
--- a/Documentation/devicetree/bindings/riscv/extensions.yaml
+++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
@@ -240,6 +240,12 @@ properties:
             as ratified at commit 4a69197e5617 ("Update to ratified state") of
             riscv-svvptc.
 
+        - const: za64rs
+          description:
+            The standard Za64rs extension for reservation set size of at most
+            64 bytes, as ratified in RISC-V Profiles Version 1.0, with commit
+            b1d806605f87 ("Updated to ratified state.")
+
         - const: zaamo
           description: |
             The standard Zaamo extension for atomic memory operations as
@@ -381,6 +387,27 @@ properties:
             in commit 64074bc ("Update version numbers for Zfh/Zfinx") of
             riscv-isa-manual.
 
+        - const: ziccamoa
+          description:
+            The standard Ziccamoa extension for main memory (cacheability and
+            coherence) must support all atomics in A, as ratified in RISC-V
+            Profiles Version 1.0, with commit b1d806605f87 ("Updated to
+            ratified state.")
+
+        - const: ziccif
+          description:
+            The standard Ziccif extension for main memory (cacheability and
+            coherence) instruction fetch atomicity, as ratified in RISC-V
+            Profiles Version 1.0, with commit b1d806605f87 ("Updated to
+            ratified state.")
+
+        - const: zicclsm
+          description:
+            The standard Zicclsm extension for main memory (cacheability and
+            coherence) must support misaligned loads and stores, as ratified
+            in RISC-V Profiles Version 1.0, with commit b1d806605f87 ("Updated
+            to ratified state.")
+
         - const: ziccrse
           description:
             The standard Ziccrse extension which provides forward progress
@@ -769,6 +796,18 @@ properties:
         then:
           contains:
             const: b
+      # Za64rs and Ziccrse depend on Zalrsc or A
+      - if:
+          contains:
+            anyOf:
+              - const: za64rs
+              - const: ziccrse
+        then:
+          oneOf:
+            - contains:
+                const: zalrsc
+            - contains:
+                const: a
       # Zcb depends on Zca
       - if:
           contains:
@@ -810,6 +849,16 @@ properties:
         then:
           contains:
             const: f
+      # Ziccamoa depends on Zaamo or A
+      - if:
+          contains:
+            const: ziccamoa
+        then:
+          oneOf:
+            - contains:
+                const: zaamo
+            - contains:
+                const: a
       # Zvfbfmin depends on V or Zve32f
       - if:
           contains: