[RFC PATCH 1/3] dt-bindings: riscv: Add Worlds ISA extensions

[Yu-Chien Peter Lin <peter.lin@sifive.com>]

Add DT bindings for RISC-V Worlds ISA extensions to tag
transactions with World IDs that hardware uses to enforce
world-based isolation across execution contexts.

Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
---
 .../devicetree/bindings/riscv/extensions.yaml | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml
index 2b0a8a93bb21..1bc8b1aa67c0 100644
--- a/Documentation/devicetree/bindings/riscv/extensions.yaml
+++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
@@ -193,12 +193,35 @@ properties:
             ratified at commit d70011dde6c2 ("Update to ratified state")
             of riscv-j-extension.
 
+        - const: smlwid
+          description: |
+            The standard Smlwid extension for M-mode control of lower
+            privilege World ID via the mlwid CSR as ratified at commit
+            TBD ("TBD") of riscv-worlds.
+
+        - const: smlwidlist
+          description: |
+            The standard Smlwidlist extension for M-mode control of lower
+            privilege World IDs via the mlwidlist CSR as ratified at commit
+            TBD ("TBD") of riscv-worlds.
+
         - const: smstateen
           description: |
             The standard Smstateen extension for controlling access to CSRs
             added by other RISC-V extensions in H/S/VS/U/VU modes and as
             ratified at commit a28bfae (Ratified (#7)) of riscv-state-enable.
 
+        - const: smwdeleg
+          description: |
+            The standard Smwdeleg extension for M-mode delegation of lower
+            privilege World ID control to S-mode via the mwiddeleg CSR, as
+            ratified at commit TBD ("TBD") of riscv-worlds.
+
+        - const: smwid
+          description: |
+            The standard Smwid extension for M-mode World ID control via the
+            mwid CSR as ratified at commit TBD ("TBD") of riscv-worlds.
+
         - const: ssaia
           description: |
             The standard Ssaia supervisor-level extension for the advanced
@@ -262,6 +285,12 @@ properties:
             ratified in RISC-V Profiles Version 1.0, with commit b1d806605f87
             ("Updated to ratified state.")
 
+        - const: sswid
+          description: |
+            The standard Sswid extension for S-mode control of lower
+            privilege World IDs via the slwid CSR as ratified at commit
+            TBD ("TBD") of riscv-worlds.
+
         - const: supm
           description: |
             The standard Supm extension for pointer masking support in user
-- 
2.43.7