dts: bindings: counter: add NEORV32 GPTMR devicetree binding

Add devicetree binding for the NEORV32 General Purpose Timer (GPTMR).

Signed-off-by: Henrik Brix Andersen <henrik@brixandersen.dk>

Author: henrikbrixandersen

dts/bindings/counter/neorv32,gptmr.yaml

@@ -0,0 +1,25 @@
+description: NEORV32 General Purpose Timer (GPTMR)
+
+compatible: "neorv32,gptmr"
+
+include: base.yaml
+
+properties:
+  interrupts:
+    required: true
+
+  reg:
+    required: true
+
+  syscon:
+    type: phandle
+    required: true
+    description: |
+      phandle to syscon (NEORV32 SYSINFO) node.
+
+  prescaler:
+    type: int
+    enum: [2, 4, 8, 64, 128, 1024, 2048, 4096]
+    required: true
+    description: |
+      Clock prescaler setting for scaling the main NEORV32 processor clock to the GPTMR clock.