dt-bindings: Merge gpio-usb-b-connector with usb-connector

The binding for usb-connector is a superset of gpio-usb-b-connector. One
major difference is that gpio-usb-b-connector requires at least one of
the vbus-gpios and id-gpios properties to be specified. Merge the two
bindings by adding the compatible string combination for the GPIO USB-B
variant and an extra conditional for the required properties list to the
usb-connector.yaml file.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/connector/usb-connector.yaml

@@ -15,10 +15,15 @@ description:
 
 properties:
   compatible:
-    enum:
-      - usb-a-connector
-      - usb-b-connector
-      - usb-c-connector
+    oneOf:
+      - enum:
+          - usb-a-connector
+          - usb-b-connector
+          - usb-c-connector
+
+      - items:
+          - const: gpio-usb-b-connector
+          - const: usb-b-connector
 
   label:
     description: Symbolic name for the connector.
@@ -140,6 +145,19 @@ properties:
 required:
   - compatible
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: gpio-usb-b-connector
+    then:
+      anyOf:
+        - required:
+            - vbus-gpios
+        - required:
+            - id-gpios
+
 examples:
   # Micro-USB connector with HS lines routed via controller (MUIC).
   - |
@@ -202,3 +220,16 @@ examples:
         op-sink-microwatt = <10000000>;
       };
     };
+
+  # USB connector with GPIO control lines
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    usb {
+      connector {
+        compatible = "gpio-usb-b-connector", "usb-b-connector";
+        type = "micro";
+        id-gpios = <&pio 12 GPIO_ACTIVE_HIGH>;
+        vbus-supply = <&usb_p0_vbus>;
+      };
+    };

Documentation/devicetree/bindings/usb/usb-conn-gpio.txt

-USB GPIO Based Connection Detection
-
-This is typically used to switch dual role mode from the USB ID pin connected
-to an input GPIO, and also used to enable/disable device mode from the USB
-Vbus pin connected to an input GPIO.
-
-Required properties:
-- compatible : should include "gpio-usb-b-connector" and "usb-b-connector".
-- id-gpios, vbus-gpios : input gpios, either one of them must be present,
-	and both can be present as well.
-	see connector/usb-connector.yaml
-
-Optional properties:
-- vbus-supply : can be present if needed when supports dual role mode.
-	see connector/usb-connector.yaml
-
-- Sub-nodes:
-	- port : can be present.
-		see graph.txt
-
-Example:
-
-&mtu3 {
-	connector {
-		compatible = "gpio-usb-b-connector", "usb-b-connector";
-		type = "micro";
-		id-gpios = <&pio 12 GPIO_ACTIVE_HIGH>;
-		vbus-supply = <&usb_p0_vbus>;
-	};
-};