dt-bindings: gpio: zynq: Describe gpio-line-names

Number of lines depends on compatible string from 58 to 174.
That's why it is checked based on it.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/4b9db94cdd8ca106feee53f76fab2a23721f7d2a.1634290039.git.michal.simek@xilinx.com
Signed-off-by: Michal Simek <michal.simek@amd.com>

Documentation/devicetree/bindings/gpio/gpio-zynq.yaml

@@ -28,6 +28,11 @@ properties:
 
   gpio-controller: true
 
+  gpio-line-names:
+    description: strings describing the names of each gpio line
+    minItems: 58
+    maxItems: 174
+
   interrupt-controller: true
 
   "#interrupt-cells":
@@ -39,6 +44,51 @@ properties:
   power-domains:
     maxItems: 1
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          enum:
+            - xlnx,zynqmp-gpio-1.0
+    then:
+      properties:
+        gpio-line-names:
+          minItems: 174
+          maxItems: 174
+
+  - if:
+      properties:
+        compatible:
+          enum:
+            - xlnx,zynq-gpio-1.0
+    then:
+      properties:
+        gpio-line-names:
+          minItems: 118
+          maxItems: 118
+
+  - if:
+      properties:
+        compatible:
+          enum:
+            - xlnx,versal-gpio-1.0
+    then:
+      properties:
+        gpio-line-names:
+          minItems: 58
+          maxItems: 58
+
+  - if:
+      properties:
+        compatible:
+          enum:
+            - xlnx,pmc-gpio-1.0
+    then:
+      properties:
+        gpio-line-names:
+          minItems: 116
+          maxItems: 116
+
 required:
   - compatible
   - reg