dt-bindings: bus: Convert GISB arbiter to YAML

Convert the Broadcom STB GISB bus arbiter to YAML to help with
validation.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211217042001.479577-6-f.fainelli@gmail.com

Documentation/devicetree/bindings/bus/brcm,gisb-arb.txt

-Broadcom GISB bus Arbiter controller
-
-Required properties:
-
-- compatible:
-    "brcm,bcm7278-gisb-arb" for V7 28nm chips
-    "brcm,gisb-arb" or "brcm,bcm7445-gisb-arb" for other 28nm chips
-    "brcm,bcm7435-gisb-arb" for newer 40nm chips
-    "brcm,bcm7400-gisb-arb" for older 40nm chips and all 65nm chips
-    "brcm,bcm7038-gisb-arb" for 130nm chips
-- reg: specifies the base physical address and size of the registers
-- interrupts: specifies the two interrupts (timeout and TEA) to be used from
-  the parent interrupt controller. A third optional interrupt may be specified
-  for breakpoints.
-
-Optional properties:
-
-- brcm,gisb-arb-master-mask: 32-bits wide bitmask used to specify which GISB
-  masters are valid at the system level
-- brcm,gisb-arb-master-names: string list of the litteral name of the GISB
-  masters. Should match the number of bits set in brcm,gisb-master-mask and
-  the order in which they appear
-
-Example:
-
-gisb-arb@f0400000 {
-	compatible = "brcm,gisb-arb";
-	reg = <0xf0400000 0x800>;
-	interrupts = <0>, <2>;
-	interrupt-parent = <&sun_l2_intc>;
-
-	brcm,gisb-arb-master-mask = <0x7>;
-	brcm,gisb-arb-master-names = "bsp_0", "scpu_0", "cpu_0";
-};

Documentation/devicetree/bindings/bus/brcm,gisb-arb.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/bus/brcm,gisb-arb.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Broadcom GISB bus Arbiter controller
+
+maintainers:
+  - Florian Fainelli <f.fainelli@gmail.com>
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - brcm,bcm7445-gisb-arb  # for other 28nm chips
+          - const: brcm,gisb-arb
+      - items:
+          - enum:
+              - brcm,bcm7278-gisb-arb  # for V7 28nm chips
+              - brcm,bcm7435-gisb-arb  # for newer 40nm chips
+              - brcm,bcm7400-gisb-arb  # for older 40nm chips and all 65nm chips
+              - brcm,bcm7038-gisb-arb  # for 130nm chips
+              - brcm,gisb-arb          # fallback compatible
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    minItems: 2
+    items:
+      - description: timeout interrupt line
+      - description: target abort interrupt line
+      - description: breakpoint interrupt line
+
+  brcm,gisb-arb-master-mask:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: >
+      32-bits wide bitmask used to specify which GISB masters are valid at the
+      system level
+
+  brcm,gisb-arb-master-names:
+    $ref: /schemas/types.yaml#/definitions/string-array
+    description: >
+      String list of the litteral name of the GISB masters. Should match the
+      number of bits set in brcm,gisb-master-mask and the order in which they
+      appear from MSB to LSB.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    gisb-arb@f0400000 {
+      compatible = "brcm,gisb-arb";
+      reg = <0xf0400000 0x800>;
+      interrupts = <0>, <2>;
+      interrupt-parent = <&sun_l2_intc>;
+      brcm,gisb-arb-master-mask = <0x7>;
+      brcm,gisb-arb-master-names = "bsp_0", "scpu_0", "cpu_0";
+    };