regulator: dt-bindings: pca9540: add debounce timer configuration

Make the different debounce timers configurable from the devicetree.
Depending on the board design, these have to be set different than the
default register values.

Signed-off-by: Martijn de Gouw <[e-mail]>
Reviewed-by: Rob Herring (Arm) <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml

···
       When WDOG_B signal is asserted a warm reset will be done instead of cold
       reset.
 
+  nxp,pmic-on-req-on-debounce-us:
+    enum: [ 120, 20000, 100000, 750000 ]
+    description: Debounce time for PMIC_ON_REQ high.
+
+  nxp,pmic-on-req-off-debounce-us:
+    enum: [ 120, 2000 ]
+    description: Debounce time for PMIC_ON_REQ is asserted low
+
+  nxp,power-on-step-ms:
+    enum: [ 1, 2, 4, 8]
+    description: Time step configuration during power on sequence
+
+  nxp,power-down-step-ms:
+    enum: [ 2, 4, 8, 16 ]
+    description: Time step configuration during power down sequence
+
+  nxp,restart-ms:
+    enum: [ 250, 500 ]
+    description: Time to stay off regulators during Cold reset
+
+  npx,pmic-rst-b-debounce-ms:
+    enum: [ 10, 50, 100, 500, 1000, 2000, 4000, 8000 ]
+    description: PMIC_RST_B debounce time
+
 required:
   - compatible
   - reg