linux-kernel - [PATCH v2 08/13] dt-bindings: riscv: Add descriptions for Za64rs, Ziccamoa, Ziccif, and Zicclsm

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Message-Id: <20251222-k3-basic-dt-v2-8-3af3f3cd0f8a@riscstar.com>
Date: Mon, 22 Dec 2025 21:04:18 +0800
From: Guodong Xu <guodong@...cstar.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Paul Walmsley <pjw@...nel.org>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Alexandre Ghiti <alex@...ti.fr>, Yixun Lan <dlan@...too.org>, 
 Daniel Lezcano <daniel.lezcano@...aro.org>, 
 Thomas Gleixner <tglx@...utronix.de>, 
 Samuel Holland <samuel.holland@...ive.com>, 
 Anup Patel <anup@...infault.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Jiri Slaby <jirislaby@...nel.org>, Lubomir Rintel <lkundrak@...sk>, 
 Yangyu Chen <cyy@...self.name>
Cc: Paul Walmsley <paul.walmsley@...ive.com>, 
 Conor Dooley <conor@...nel.org>, Heinrich Schuchardt <xypron.glpk@....de>, 
 Kevin Meng Zhang <zhangmeng.kevin@...ux.spacemit.com>, 
 Anup Patel <anup@...infault.org>, Andrew Jones <ajones@...tanamicro.com>, 
 devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, spacemit@...ts.linux.dev, 
 linux-serial@...r.kernel.org, Guodong Xu <guodong@...cstar.com>
Subject: [PATCH v2 08/13] 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

Since Ziccamoa depends on the 'A' extension, add a schema check to
enforce this dependency.

Signed-off-by: Guodong Xu <guodong@...cstar.com>
---
v2: New patch.
---
 .../devicetree/bindings/riscv/extensions.yaml      | 34 ++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml
index 385e1deb23996d294e7662693f1257f910a6e129..a6b9d7e3edf86ecfb117ba72e295ef097bdc9831 100644
--- a/Documentation/devicetree/bindings/riscv/extensions.yaml
+++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
@@ -237,6 +237,12 @@ 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
@@ -378,6 +384,27 @@ 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
@@ -795,6 +822,13 @@ properties:
         then:
           contains:
             const: f
+      # Ziccamoa depends on A
+      - if:
+          contains:
+            const: ziccamoa
+        then:
+          contains:
+            const: a
       # Zvfbfmin depends on V or Zve32f
       - if:
           contains:

-- 
2.43.0