Document the optional dr_mode property

Signed-off-by: Chris Brandt <chris.bra...@renesas.com>
---
 Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt 
b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
index ca8a831d4273..d42e180d29b8 100644
--- a/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
+++ b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
@@ -50,6 +50,9 @@ channel as USB OTG:
               regulator will be managed during the PHY power on/off sequence.
 - renesas,no-otg-pins: boolean, specify when a board does not provide proper
                       otg pins.
+- dr_mode: string, indicates the working mode for the PHY. Can be "host",
+           "peripheral", or "otg". Should be set if otg controller is not used.
+
 
 Example (R-Car H3):
 
-- 
2.16.1

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