Document r8a7744 xhci support. The driver will use the fallback
compatible string "renesas,rcar-gen2-xhci", therefore no driver
change is needed.

Signed-off-by: Biju Das <biju....@bp.renesas.com>
Reviewed-by: Chris Paterson <chris.paters...@renesas.com>
---
This patch is tested against linux-next next-20180927 and usb-next
---
 Documentation/devicetree/bindings/usb/usb-xhci.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.txt 
b/Documentation/devicetree/bindings/usb/usb-xhci.txt
index fb564e7..fea8b15 100644
--- a/Documentation/devicetree/bindings/usb/usb-xhci.txt
+++ b/Documentation/devicetree/bindings/usb/usb-xhci.txt
@@ -8,6 +8,7 @@ Required properties:
     - "marvell,armada-375-xhci" for Armada 375 SoCs
     - "marvell,armada-380-xhci" for Armada 38x SoCs
     - "renesas,xhci-r8a7743" for r8a7743 SoC
+    - "renesas,xhci-r8a7744" for r8a7744 SoC
     - "renesas,xhci-r8a774a1" for r8a774a1 SoC
     - "renesas,xhci-r8a7790" for r8a7790 SoC
     - "renesas,xhci-r8a7791" for r8a7791 SoC
-- 
2.7.4

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