WIP: device tree MVP

dts/bindings/misc/nuvoton,npcx-booter-variant.yaml

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+# Copyright (c) 2021 Nuvoton Technology Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+description: Nuvoton, NPCX booter variant options
+
+compatible: "nuvoton,npcx-booter-variant"
+
+properties:
+    hif-type-auto:
+        type: boolean
+        required: false
+        description: |
+            The host interface type (LPC/eSPI/SHI) is configured by booter
+            if true; otherwise, it should be configured by the firmware.

dts/bindings/misc/nuvoton,npcx-soc-id.yaml

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+# Copyright (c) 2021 Nuvoton Technology Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+description: Nuvoton, NPCX soc ID node
+
+compatible: "nuvoton,npcx-soc-id"
+
+properties:
+    family-id:
+        type: int
+        required: true
+        description: NPCX family ID
+
+    chip-id:
+        type: int
+        required: true
+        description: NPCX chip ID
+
+    device-id:
+        type: int
+        required: true
+        description: NPCX device ID
+
+    revision-reg:
+        type: array
+        required: true
+        description: NPCX revision register address & length in byte

dts/bindings/misc/skyworks,sky13351.yaml

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+# Copyright (c) 2019, Peter Bigot Consulting, LLC
+# SPDX-License-Identifier: Apache-2.0
+
+description: Output selectors on the SKY13351 GaAs SPDT FET I/C switch
+
+compatible: "skyworks,sky13351"
+
+include: base.yaml
+
+properties:
+    vctl1-gpios:
+        type: phandle-array
+        required: true
+        description: VCTL1 pin
+    vctl2-gpios:
+        type: phandle-array
+        required: true
+        description: VCTL2 pin

dts/bindings/misc/zephyr,modbus-serial.yaml

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+# Copyright (c) 2020 PHYTEC Messtechnik GmbH
+# SPDX-License-Identifier: Apache-2.0
+
+description: Modbus over serial line device
+
+compatible: "zephyr,modbus-serial"
+
+include: uart-device.yaml
+
+properties:
+    de-gpios:
+      type: phandle-array
+      required: false
+      description: Driver enable pin.
+
+        Driver enable pin (DE) of the RS-485 transceiver.
+        If connected directly the MCU pin should be configured
+        as active high.
+
+    re-gpios:
+      type: phandle-array
+      required: false
+      description: Receiver enable pin.
+
+        Receiver enable pin (nRE) of the RS-485 transceiver.
+        If connected directly the MCU pin should be configured
+        as active low.