[RFC PATCH v2 3/3] dt-bindings: usb: snps,dwc3: add generic-xhci as child

[Daehwan Jung]

Currently, dwc3 invokes just xhci platform driver(generic-xhci) without
DT schema even though xhci works as child of dwc3. It makes sense to add
xhci as child of dwc3 with DT schema. It also supports to use another
compatible in xhci platform driver.

Signed-off-by: Daehwan Jung <dh10.jung@xxxxxxxxxxx>
---
 .../devicetree/bindings/usb/snps,dwc3.yaml    | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
index 6d78048c4613..83ed7c526dba 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -360,8 +360,22 @@ properties:
     description:
       Enable USB remote wakeup.
 
+  "#address-cells":
+    enum: [ 1, 2 ]
+
+  "#size-cells":
+    enum: [ 1, 2 ]
+
+  ranges: true
+
 unevaluatedProperties: false
 
+# Required child node:
+patternProperties:
+  "^usb@[0-9a-f]+$":
+    $ref: generic-xhci.yaml#
+    description: Required child node
+
 required:
   - compatible
   - reg
@@ -388,4 +402,19 @@ examples:
       snps,dis_u2_susphy_quirk;
       snps,dis_enblslpm_quirk;
     };
+  - |
+    usb@4a200000 {
+      compatible = "snps,dwc3";
+      reg = <0x4a200000 0xcfff>;
+      interrupts = <0 92 4>;
+      #address-cells = <1>;
+      #size-cells = <1>;
+      ranges;
+
+      xhci: usb@4a200000 {
+        compatible = "generic-xhci";
+        reg = <0x4a200000 0x7fff>;
+        interrupts = <0 92 4>;
+      };
+    };
 ...
-- 
2.31.1