dt-bindings: touchscreen: fsl,imx6ul-tsc: support glitch thresold

Support the debounce-delay-us property.

Drivers must convert this value to IPG clock cycles and map it to one of
the four discrete thresholds exposed by the TSC_DEBUG_MODE2 register:

0: 8191 IPG cycles
1: 4095 IPG cycles
2: 2047 IPG cycles
3: 1023 IPG cycles

Signed-off-by: Dario Binacchi <[e-mail]>
Acked-by: Conor Dooley <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Dmitry Torokhov <[e-mail]>

Documentation/devicetree/bindings/input/touchscreen/fsl,imx6ul-tsc.yaml

···
     description: Number of data samples which are averaged for each read.
     enum: [ 1, 4, 8, 16, 32 ]
 
+  debounce-delay-us:
+    description: |
+      Minimum duration in microseconds a signal must remain stable
+      to be considered valid.
+
+      Drivers must convert this value to IPG clock cycles and map
+      it to one of the four discrete thresholds exposed by the
+      TSC_DEBUG_MODE2 register:
+
+        0: 8191 IPG cycles
+        1: 4095 IPG cycles
+        2: 2047 IPG cycles
+        3: 1023 IPG cycles
+
 required:
   - compatible
   - reg