dt-bindings: pinctrl: Add apple,npins property to apple,pinctrl

This property is used to describe the total number of pins on this
particular pinctrl hardware block.
Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211026175815.52703-4-joey.gouly@arm.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/apple,pinctrl.yaml

@@ -34,6 +34,10 @@ properties:
   gpio-ranges:
     maxItems: 1
 
+  apple,npins:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: The number of pins in this GPIO controller.
+
   interrupts:
     description: One interrupt for each of the (up to 7) interrupt
       groups supported by the controller sorted by interrupt group
@@ -69,6 +73,7 @@ required:
   - gpio-controller
   - '#gpio-cells'
   - gpio-ranges
+  - apple,npins
 
 additionalProperties: false
 
@@ -89,6 +94,7 @@ examples:
         gpio-controller;
         #gpio-cells = <2>;
         gpio-ranges = <&pinctrl 0 0 212>;
+        apple,npins = <212>;
 
         interrupt-controller;
         #interrupt-cells = <2>;