Add description for bcm63xx gpio-ctrl phandle which allows
access to registers that control phy functionality.

Signed-off-by: Kyle Hendry <kylehendrydev@gmail.com>
---
 Documentation/devicetree/bindings/net/dsa/brcm,b53.yaml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/dsa/brcm,b53.yaml b/Documentation/devicetree/bindings/net/dsa/brcm,b53.yaml
index d6c957a33b48..fbab3a1a8d3e 100644
--- a/Documentation/devicetree/bindings/net/dsa/brcm,b53.yaml
+++ b/Documentation/devicetree/bindings/net/dsa/brcm,b53.yaml
@@ -66,6 +66,12 @@ properties:
               - brcm,bcm63268-switch
           - const: brcm,bcm63xx-switch
 
+  brcm,gpio-ctrl:
+    description:
+      A phandle to the syscon node of the bcm63xx gpio controller
+      which contains phy control registers
+    $ref: /schemas/types.yaml#/definitions/phandle
+
 required:
   - compatible
   - reg
-- 
2.43.0