dt-bindings: soc: bcm: Convert brcm,bcm2835-vchiq to json-schema

This converts the VCHIQ bindings to YAML format.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Co-developed-by: Nicolas Saenz Julienne <nsaenz@kernel.org>
Signed-off-by: Nicolas Saenz Julienne <nsaenz@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211215094448.280796-1-nsaenz@kernel.org

Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-vchiq.txt

@@ -1,17 +0,0 @@
-Broadcom VCHIQ firmware services
-
-Required properties:
-
-- compatible:	Should be "brcm,bcm2835-vchiq" on BCM2835, otherwise
-		"brcm,bcm2836-vchiq".
-- reg:		Physical base address and length of the doorbell register pair
-- interrupts:	The interrupt number
-		  See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
-
-Example:
-
-mailbox@7e00b840 {
-	compatible = "brcm,bcm2835-vchiq";
-	reg = <0x7e00b840 0xf>;
-	interrupts = <0 2>;
-};

Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-vchiq.yaml

@@ -0,0 +1,53 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/bcm/brcm,bcm2835-vchiq.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Broadcom VCHIQ firmware services
+
+maintainers:
+  - Nicolas Saenz Julienne <nsaenz@kernel.org>
+
+description:
+  The VCHIQ communication channel can be provided by BCM283x and Capri SoCs,
+  to communicate with the VPU-side OS services.
+
+properties:
+  compatible:
+    oneOf:
+      - description: BCM2835 based boards
+        items:
+          - enum:
+              - brcm,bcm2835-vchiq
+
+      - description: BCM2836/BCM2837 based boards
+        items:
+          - enum:
+              - brcm,bcm2836-vchiq
+          - const: brcm,bcm2835-vchiq
+
+  reg:
+    description: Physical base address and length of the doorbell register pair
+    minItems: 1
+
+  interrupts:
+    description: Interrupt number of the doorbell interrupt
+    minItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    mailbox@7e00b840 {
+      compatible = "brcm,bcm2835-vchiq";
+      reg = <0x7e00b840 0xf>;
+      interrupts = <0 2>;
+    };
+
+...