bus: Add DT bindings for Integrator/AP logic modules

This adds YAML device tree bindings for the Integrator/AP
logic modules. These are plug-in tiles used typically for
FPGA prototyping.
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20200320134524.52140-1-linus.walleij@linaro.orgSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/bus/arm,integrator-ap-lm.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/bus/arm,integrator-ap-lm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Integrator/AP Logic Module extension bus
+
+maintainers:
+  - Linus Walleij <linusw@kernel.org>
+
+description: The Integrator/AP is a prototyping platform and as such has a
+  site for stacking up to four logic modules (LM) designed specifically for
+  use with this platform. A special system controller register can be read to
+  determine if a logic module is connected at index 0, 1, 2 or 3. The logic
+  module connector is described in this binding. The logic modules per se
+  then have their own specific per-module bindings and they will be described
+  as subnodes under this logic module extension bus.
+
+properties:
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 1
+
+  compatible:
+    items:
+      - const: arm,integrator-ap-lm
+
+  ranges: true
+  dma-ranges: true
+
+patternProperties:
+  "^bus(@[0-9a-f]*)?$":
+    description: Nodes on the Logic Module bus represent logic modules
+      and are named with bus. The first module is at 0xc0000000, the second
+      at 0xd0000000 and so on until the top of the memory of the system at
+      0xffffffff. All information about the memory used by the module is
+      in ranges and dma-ranges.
+    type: object
+
+    required:
+      - compatible
+
+required:
+  - compatible
+
+examples:
+  - |
+    bus@c0000000 {
+      compatible = "arm,integrator-ap-lm";
+      #address-cells = <1>;
+      #size-cells = <1>;
+      ranges = <0xc0000000 0xc0000000 0x40000000>;
+      dma-ranges;
+
+      bus@c0000000 {
+        compatible = "simple-bus";
+        ranges = <0x00000000 0xc0000000 0x10000000>;
+        /* The Logic Modules sees the Core Module 0 RAM @80000000 */
+        dma-ranges = <0x00000000 0x80000000 0x10000000>;
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        serial@100000 {
+          compatible = "arm,pl011", "arm,primecell";
+          reg = <0x00100000 0x1000>;
+          interrupts-extended = <&impd1_vic 1>;
+        };
+
+        impd1_vic: interrupt-controller@3000000 {
+          compatible = "arm,pl192-vic";
+          interrupt-controller;
+          #interrupt-cells = <1>;
+          reg = <0x03000000 0x1000>;
+          valid-mask = <0x00000bff>;
+          interrupts-extended = <&pic 9>;
+        };
+      };
+    };
+
+additionalProperties: false