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

Add yaml files to DT for initial support of STM32 SPI

Origin: original

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

dts/bindings/spi/spi.yaml

@@ -0,0 +1,28 @@
+#
+# Copyright (c) 2018, I-SENSE group of ICCS
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+---
+title: SPI Base Structure
+id: spi
+version: 0.1
+
+description: >
+    This binding gives the base structures for all SPI devices
+
+properties:
+    "#address-cells":
+      type: int
+      category: required
+      description: should be 1.
+    "#size-cells":
+      type: int
+      category: required
+      description: should be 0.
+    label:
+      type: string
+      category: required
+      description: Human readable string describing the device (used by Zephyr for API name)
+      generation: define
+...

dts/bindings/spi/st,stm32-spi-fifo.yaml

@@ -0,0 +1,43 @@
+#
+# Copyright (c) 2018, I-SENSE group of ICCS
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+---
+title: STM32 SPI FIFO
+id: st,stm32-spi-fifo
+version: 0.1
+
+description: >
+    This binding gives a base representation of the STM32 SPI controller with
+    embedded Rx and Tx FIFOs
+
+inherits:
+    !include spi.yaml
+
+properties:
+    compatible:
+      type: string
+      category: required
+      description: compatible strings
+      constraint: "st,stm32-spi-fifo"
+
+    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
+
+...

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

@@ -0,0 +1,42 @@
+#
+# Copyright (c) 2018, I-SENSE group of ICCS
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+---
+title: STM32 SPI
+id: st,stm32-spi
+version: 0.1
+
+description: >
+    This binding gives a base representation of the STM32 SPI controller
+
+inherits:
+    !include spi.yaml
+
+properties:
+    compatible:
+      type: string
+      category: required
+      description: compatible strings
+      constraint: "st,stm32-spi"
+
+    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
+
+...