dt-bindings: memory: convert Broadcom DPFE to dtschema

Convert Broadcom DDR PHY Front End (DPFE) bindings to DT schema format
using json-schema.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Acked-by: Markus Mayer <mmayer@broadcom.com>
Link: https://lore.kernel.org/r/20210817080617.14503-1-krzysztof.kozlowski@canonical.com
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/memory-controllers/brcm,dpfe-cpu.yaml

@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/memory-controllers/brcm,dpfe-cpu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: DDR PHY Front End (DPFE) for Broadcom STB
+
+maintainers:
+  - Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
+  - Markus Mayer <mmayer@broadcom.com>
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - brcm,bcm7271-dpfe-cpu
+          - brcm,bcm7268-dpfe-cpu
+      - const: brcm,dpfe-cpu
+
+  reg:
+    items:
+      - description: DCPU register space
+      - description: DCPU data memory space
+      - description: DCPU instruction memory space
+
+  reg-names:
+    items:
+      - const: dpfe-cpu
+      - const: dpfe-dmem
+      - const: dpfe-imem
+
+required:
+  - compatible
+  - reg
+  - reg-names
+
+additionalProperties: false
+
+examples:
+  - |
+    dpfe-cpu@f1132000 {
+        compatible = "brcm,bcm7271-dpfe-cpu", "brcm,dpfe-cpu";
+        reg = <0xf1132000 0x180>,
+              <0xf1134000 0x1000>,
+              <0xf1138000 0x4000>;
+        reg-names = "dpfe-cpu", "dpfe-dmem", "dpfe-imem";
+    };