dt-bindings: interrupt-controller: Add Loongson-2K1000 LIOINTC

Add liointc-2.0 properties support, so update the maxItems and
condition description.

Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Tested-by: Ming Wang <wangming01@loongson.cn>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

Documentation/devicetree/bindings/interrupt-controller/loongson,liointc.yaml

@@ -10,9 +10,9 @@ maintainers:
   - Jiaxun Yang <jiaxun.yang@flygoat.com>
 
 description: |
-  This interrupt controller is found in the Loongson-3 family of chips as the primary
-  package interrupt controller which can route local I/O interrupt to interrupt lines
-  of cores.
+  This interrupt controller is found in the Loongson-3 family of chips and
+  Loongson-2K1000 chip, as the primary package interrupt controller which
+  can route local I/O interrupt to interrupt lines of cores.
 
 allOf:
   - $ref: /schemas/interrupt-controller.yaml#
@@ -22,9 +22,17 @@ properties:
     oneOf:
       - const: loongson,liointc-1.0
       - const: loongson,liointc-1.0a
+      - const: loongson,liointc-2.0
 
   reg:
-    maxItems: 1
+    minItems: 1
+    maxItems: 3
+
+  reg-names:
+    items:
+      - const: main
+      - const: isr0
+      - const: isr1
 
   interrupt-controller: true
 
@@ -69,6 +77,26 @@ required:
 
 unevaluatedProperties: false
 
+if:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - loongson,liointc-2.0
+
+then:
+  properties:
+    reg:
+      minItems: 3
+
+  required:
+    - reg-names
+
+else:
+  properties:
+    reg:
+      maxItems: 1
+
 examples:
   - |
     iointc: interrupt-controller@3ff01400 {