dts: bindings: Add yaml files for STM32 USB support to DT

Add yaml files to DT for initial support of STM32 USB

Origin: original

Signed-off-by: Yannis Damigos <giannis.damigos@gmail.com>

dts/bindings/usb/st,stm32-otgfs.yaml

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+#
+# Copyright (c) 2017, I-SENSE group of ICCS
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+---
+title: STM32 OTGFS
+id: st,stm32-otgfs
+version: 0.1
+
+description: >
+    This binding gives a base representation of the STM32 OTGFS controller
+
+inherits:
+    !include usb-ep.yaml
+
+properties:
+    compatible:
+      constraint: "st,stm32-otgfs"
+
+    reg:
+      type: array
+      description: mmio register space
+      generation: define
+      category: required
+
+    interrupts:
+      type: array
+      category: required
+      description: required interrupts
+      generation: define
+
+    interrupt-names:
+      type: stringlist
+      category: optional
+      description: readable string describing the interrupts
+      generation: define
+
+    ram-size:
+      type: int
+      category: required
+      description: Size of USB dedicated RAM. STM32 SOC's reference
+                   manual defines a shared FIFO size.
+      generation: define
+...

dts/bindings/usb/st,stm32-usb.yaml

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+#
+# Copyright (c) 2017, I-SENSE group of ICCS
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+---
+title: STM32 USB
+id: st,stm32-usb
+version: 0.1
+
+description: >
+    This binding gives a base representation of the STM32 USB controller
+
+inherits:
+    !include usb-ep.yaml
+
+properties:
+    compatible:
+      constraint: "st,stm32-usb"
+
+    reg:
+      type: array
+      description: mmio register space
+      generation: define
+      category: required
+
+    interrupts:
+      type: array
+      category: required
+      description: required interrupts
+      generation: define
+
+    interrupt-names:
+      type: stringlist
+      category: optional
+      description: readable string describing the interrupts
+      generation: define
+
+    ram-size:
+      type: int
+      category: required
+      description: Size of USB dedicated RAM. STM32 SOC's reference
+                   manual defines USB packet SRAM size.
+      generation: define
+...

dts/bindings/usb/usb-ep.yaml

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+#
+# Copyright (c) 2018, I-SENSE group of ICCS
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+---
+title: USB Endpoints' properties
+id: USB-EP
+version: 0.1
+
+description: >
+    This binding gives number of endpoints that the USB hardware supports
+
+inherits:
+    !include usb.yaml
+
+properties:
+    num-bidir-endpoints:
+      type: int
+      category: required
+      description: Number of bi-directional endpoints supported by hardware
+                   (including EP0)
+      generation: define
+
+    num-in-endpoints:
+      type: int
+      category: optional
+      description: Number of IN endpoints supported by hardware
+                   (including EP0 IN)
+      generation: define
+
+    num-out-endpoints:
+      type: int
+      category: optional
+      description: Number of OUT endpoints supported by hardware
+                   (including EP0 OUT)
+      generation: define
+...

dts/bindings/usb/usb.yaml

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+#
+# Copyright (c) 2018, I-SENSE group of ICCS
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+---
+title: USB Base Structure
+id: USB
+version: 0.1
+
+description: >
+    This binding gives the base structures for all USB devices
+
+properties:
+    compatible:
+      type: string
+      category: required
+      description: compatible strings
+
+    label:
+      type: string
+      category: required
+      description: Human readable string describing the device (used by Zephyr for API name)
+      generation: define
+...