dts: bindings: pwm: add binding for the NXP Kinetis Pulse Width Timer

Add devicetree binding for the NXP Kinetis Pulse Width Timer (PWT).

Signed-off-by: Henrik Brix Andersen <[email protected]>

Author: henrikbrixandersen

dts/bindings/pwm/nxp,kinetis-pwt.yaml

@@ -0,0 +1,38 @@
+# Copyright (c) 2021 Vestas Wind Systems A/S
+# SPDX-License-Identifier: Apache-2.0
+
+description: Kinetis PWT PWM Capture
+
+compatible: "nxp,kinetis-pwt"
+
+include: [pwm-controller.yaml, base.yaml]
+
+properties:
+    reg:
+      required: true
+
+    interrupts:
+      required: true
+
+    prescaler:
+      type: int
+      required: true
+      enum:
+        - 1
+        - 2
+        - 4
+        - 8
+        - 16
+        - 32
+        - 64
+        - 128
+      description: Input clock prescaler
+
+    "#pwm-cells":
+      const: 3
+
+pwm-cells:
+  - channel
+# period in terms of nanoseconds
+  - period
+  - flags