linux-kernel - [PATCH v2 11/13] dt-bindings: riscv: Add Supm extension description

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Message-Id: <20251222-k3-basic-dt-v2-11-3af3f3cd0f8a@riscstar.com>
Date: Mon, 22 Dec 2025 21:04:21 +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 11/13] dt-bindings: riscv: Add Supm extension
 description

Add description for the Supm extension. Supm indicates support for pointer
masking in user mode. Supm is mandatory for RVA23S64.

The Supm extension is ratified in commit d70011dde6c2 ("Update to ratified
state") of riscv-j-extension.

Supm depends on either Smnpm or Ssnpm, so add a schema check to enforce
this dependency.

Signed-off-by: Guodong Xu <guodong@...cstar.com>
---
v2: New patch.
---
 Documentation/devicetree/bindings/riscv/extensions.yaml | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml
index 1066b7e65dab89704dbac449db4aa5605c95b9d3..4997f533b2c0defad88fd59413a6885b5b9e109a 100644
--- a/Documentation/devicetree/bindings/riscv/extensions.yaml
+++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
@@ -267,6 +267,12 @@ properties:
             ratified in RISC-V Profiles Version 1.0, with commit b1d806605f87
             ("Updated to ratified state.")
 
+        - const: supm
+          description: |
+            The standard Supm extension for pointer masking support in user
+            mode as ratified at commit d70011dde6c2 ("Update to ratified state")
+            of riscv-j-extension.
+
         - const: svade
           description: |
             The standard Svade supervisor-level extension for SW-managed PTE A/D
@@ -892,6 +898,16 @@ properties:
                 const: shvstvecd
             - contains:
                 const: ssstateen
+      # Supm depends on either Smnpm or Ssnpm
+      - if:
+          contains:
+            const: supm
+        then:
+          anyOf:
+            - contains:
+                const: smnpm
+            - contains:
+                const: ssnpm
       # Zcb depends on Zca
       - if:
           contains:

-- 
2.43.0