[PATCH 1/3] dt-bindings: usb: renesas,usbhs: Support external ref clock

[Adam Ford]

The usbhs driver expects a fixed external reference clock, but it
could be sourced from a programmable clock instead of a fixed clock.
Add support for an optional 4th reference clock.

Signed-off-by: Adam Ford <aford173@xxxxxxxxx>

diff --git a/Documentation/devicetree/bindings/usb/renesas,usbhs.yaml b/Documentation/devicetree/bindings/usb/renesas,usbhs.yaml
index e67223d90bb7..2372d8c42979 100644
--- a/Documentation/devicetree/bindings/usb/renesas,usbhs.yaml
+++ b/Documentation/devicetree/bindings/usb/renesas,usbhs.yaml
@@ -53,11 +53,12 @@ properties:
 
   clocks:
     minItems: 1
-    maxItems: 3
+    maxItems: 4
     items:
       - description: USB 2.0 host
       - description: USB 2.0 peripheral
       - description: USB 2.0 clock selector
+      - description: Optional external reference clock
 
   interrupts:
     maxItems: 1
-- 
2.25.1