dt-bindings: riscv: add Zaamo and Zalrsc ISA extension description

Add description for the Zaamo and Zalrsc ISA extension[1].

Link: https://github.com/riscv/riscv-zaamo-zalrsc [1]
Signed-off-by: Clément Léger <cleger@rivosinc.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240619153913.867263-2-cleger@rivosinc.com
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>

Documentation/devicetree/bindings/riscv/extensions.yaml

@@ -224,6 +224,12 @@ properties:
             as ratified at commit 4a69197e5617 ("Update to ratified state") of
             riscv-svvptc.
 
+        - const: zaamo
+          description: |
+            The standard Zaamo extension for atomic memory operations as
+            ratified at commit e87412e621f1 ("integrate Zaamo and Zalrsc text
+            (#1304)") of the unprivileged ISA specification.
+
         - const: zabha
           description: |
             The Zabha extension for Byte and Halfword Atomic Memory Operations
@@ -236,6 +242,12 @@ properties:
             is supported as ratified at commit 5059e0ca641c ("update to
             ratified") of the riscv-zacas.
 
+        - const: zalrsc
+          description: |
+            The standard Zalrsc extension for load-reserved/store-conditional as
+            ratified at commit e87412e621f1 ("integrate Zaamo and Zalrsc text
+            (#1304)") of the unprivileged ISA specification.
+
         - const: zawrs
           description: |
             The Zawrs extension for entering a low-power state or for trapping
@@ -718,6 +730,13 @@ properties:
                 const: zfbfmin
             - contains:
                 const: zvfbfmin
+      # Zacas depends on Zaamo
+      - if:
+          contains:
+            const: zacas
+        then:
+          contains:
+            const: zaamo
 
 allOf:
   # Zcf extension does not exist on rv64