dt-bindings: arm: Add Integrator YAML schema

This implements the top-level schema for the ARM Integrator
platforms.

Cc: Sudeep Holla <sudeep.holla@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/arm/arm,integrator.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/arm,integrator.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ARM Integrator Boards Device Tree Bindings
+
+maintainers:
+  - Linus Walleij <linus.walleij@linaro.org>
+
+description: |+
+  These were the first ARM platforms officially supported by ARM Ltd.
+  They are ARMv4, ARMv5 and ARMv6-capable using different core tiles,
+  so the system is modular and can host a variety of CPU tiles called
+  "core tiles" and referred to in the device tree as "core modules".
+
+properties:
+  $nodename:
+    const: '/'
+  compatible:
+    oneOf:
+      - description: ARM Integrator Application Platform, this board has a PCI
+          host and several PCI slots, as well as a number of slots for logical
+          expansion modules, it is referred to as an "ASIC Development
+          Motherboard" and is extended with custom FPGA and is intended for
+          rapid prototyping. See ARM DUI 0098B. This board can physically come
+          pre-packaged in a PC Tower form factor called Integrator/PP1 or a
+          special metal fixture called Integrator/PP2, see ARM DUI 0169A.
+        items:
+          - const: arm,integrator-ap
+      - description: ARM Integrator Compact Platform (HBI-0086), this board has
+          a compact form factor and mainly consists of the bare minimum
+          peripherals to make use of the core module. See ARM DUI 0159B.
+        items:
+          - const: arm,integrator-cp
+      - description: ARM Integrator Standard Development Board (SDB) Platform,
+          this board is a PCI-based board conforming to the Microsoft SDB
+          (HARP) specification. See ARM DUI 0099A.
+        items:
+          - const: arm,integrator-sp
+
+  core-module@10000000:
+    type: object
+    description: the root node in the Integrator platforms must contain
+      a core module child node. They are always at physical address
+      0x10000000 in all the Integrator variants.
+    properties:
+      compatible:
+        items:
+          - const: arm,core-module-integrator
+          - const: syscon
+          - const: simple-mfd
+      reg:
+        maxItems: 1
+
+    required:
+      - compatible
+      - reg
+
+patternProperties:
+  "^syscon@[0-9a-f]+$":
+    description: All Integrator boards must provide a system controller as a
+      node in the root of the device tree.
+    type: object
+    properties:
+      compatible:
+        items:
+          - enum:
+            - arm,integrator-ap-syscon
+            - arm,integrator-cp-syscon
+            - arm,integrator-sp-syscon
+          - const: syscon
+      reg:
+        maxItems: 1
+
+    required:
+      - compatible
+      - reg
+
+
+required:
+  - compatible
+  - core-module@10000000
+
+...