dt-bindings: gpio: Add EIO GPIO compatible to gpio-zynq

EIO (Extended IO) GPIO is a Xilinx IP block that exposes
multiplexed I/O pins through an EIO interface.

The EIO GPIO block has 2 banks with 26 GPIOs each (52 total).
The GPIO width cannot be determined from the hardware registers,
the driver relies on the compatible string to select the correct
bank/pin configuration. A new compatible is therefore required.

The block is currently present on xa2ve3288 silicon.
The compatible string uses version 1.0 matching the IP core version.

Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@amd.com>
Link: https://patch.msgid.link/20260512060917.2096456-3-shubhrajyoti.datta@amd.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>

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

@@ -12,6 +12,7 @@ maintainers:
 properties:
   compatible:
     enum:
+      - xlnx,eio-gpio-1.0
       - xlnx,pmc-gpio-1.0
       - xlnx,versal-gpio-1.0
       - xlnx,zynq-gpio-1.0
@@ -30,7 +31,7 @@ properties:
 
   gpio-line-names:
     description: strings describing the names of each gpio line
-    minItems: 58
+    minItems: 52
     maxItems: 174
 
   interrupt-controller: true
@@ -89,6 +90,16 @@ allOf:
           minItems: 116
           maxItems: 116
 
+  - if:
+      properties:
+        compatible:
+          enum:
+            - xlnx,eio-gpio-1.0
+    then:
+      properties:
+        gpio-line-names:
+          maxItems: 52
+
 required:
   - compatible
   - reg