dt-bindings: input: iqs269a: Add bindings for OTP variants

This patch adds bindings for the D0 order code of the device. This
order code represents an OTP variant that enables a touch-and-hold
function in place of slider 1.

Also included is the ability to specify the 00 order code (default
option with no OTP customization) explicitly.

Signed-off-by: Jeff LaBundy <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/ZZMaW9RkQ9bKXOUn@nixie71
Signed-off-by: Dmitry Torokhov <[e-mail]>

Documentation/devicetree/bindings/input/iqs269a.yaml

···
 
 properties:
   compatible:
-    const: azoteq,iqs269a
+    enum:
+      - azoteq,iqs269a
+      - azoteq,iqs269a-00
+      - azoteq,iqs269a-d0
 
   reg:
     maxItems: 1
···
     enum: [0, 1, 2, 3]
     default: 1
     description: Specifies the slider coordinate filter strength.
+
+  azoteq,touch-hold-ms:
+    multipleOf: 256
+    minimum: 256
+    maximum: 65280
+    default: 5120
+    description:
+      Specifies the length of time (in ms) for which the channel selected by
+      'azoteq,gpio3-select' must be held in a state of touch in order for an
+      approximately 60-ms pulse to be asserted on the GPIO4 pin.
 
   linux,keycodes:
     minItems: 1
···
       - reg
 
     additionalProperties: false
+
+if:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - azoteq,iqs269a-d0
+then:
+  patternProperties:
+    "^channel@[0-7]$":
+      properties:
+        azoteq,slider1-select: false
+else:
+  properties:
+    azoteq,touch-hold-ms: false
 
 required:
   - compatible