dt-bindings: riscv: Add Ssccptr, Sscounterenw, Sstvala, Sstvecd, Ssu64xl

Add descriptions for five new extensions: Ssccptr, Sscounterenw, Sstvala,
Sstvecd, and Ssu64xl. 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, their
requirement status are:

 - Ssccptr: Mandatory in RVA20S64, RVA22S64, RVA23S64
 - Sscounterenw: Mandatory in RVA22S64, RVA23S64
 - Sstvala: Mandatory in RVA20S64, RVA22S64, RVA23S64
 - Sstvecd: Mandatory in RVA20S64, RVA22S64, RVA23S64
 - Ssu64xl: Optional in RVA20S64, RVA22S64; Mandatory in RVA23S64

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>

Author: docularxu

Documentation/devicetree/bindings/riscv/extensions.yaml

@@ -161,12 +161,26 @@ properties:
             behavioural changes to interrupts as frozen at commit ccbddab
             ("Merge pull request #42 from riscv/jhauser-2023-RC4") of riscv-aia.
 
+        - const: ssccptr
+          description: |
+            The standard Ssccptr extension for main memory (cacheability and
+            coherence) hardware page-table reads, as ratified in RISC-V
+            Profiles Version 1.0, with commit b1d806605f87 ("Updated to
+            ratified state.")
+
         - const: sscofpmf
           description: |
             The standard Sscofpmf supervisor-level extension for count overflow
             and mode-based filtering as ratified at commit 01d1df0 ("Add ability
             to manually trigger workflow. (#2)") of riscv-count-overflow.
 
+        - const: sscounterenw
+          description: |
+            The standard Sscounterenw extension for support writable enables
+            in scounteren for any supported counter, as ratified in RISC-V
+            Profiles Version 1.0, with commit b1d806605f87 ("Updated to
+            ratified state.")
+
         - const: ssnpm
           description: |
             The standard Ssnpm extension for next-mode pointer masking as
@@ -179,6 +193,24 @@ properties:
             ratified at commit 3f9ed34 ("Add ability to manually trigger
             workflow. (#2)") of riscv-time-compare.
 
+        - const: sstvala
+          description: |
+            The standard Sstvala extension for stval provides all needed values
+            as ratified in RISC-V Profiles Version 1.0, with commit b1d806605f87
+            ("Updated to ratified state.")
+
+        - const: sstvecd
+          description: |
+            The standard Sstvecd extension for stvec supports Direct mode as
+            ratified in RISC-V Profiles Version 1.0, with commit b1d806605f87
+            ("Updated to ratified state.")
+
+        - const: ssu64xl
+          description: |
+            The standard Ssu64xl extension for UXLEN=64 must be supported, as
+            ratified in RISC-V Profiles Version 1.0, with commit b1d806605f87
+            ("Updated to ratified state.")
+
         - const: svade
           description: |
             The standard Svade supervisor-level extension for SW-managed PTE A/D