[PATCH 1/4] Documentation: dt-bindings: add dt binding info for Rockchip dwc2

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This add necessary dwc2 binding documentation for Rockchip socs:
rk3066, rk3188 and rk3288

add dr_mode as optional properties.

Signed-off-by: Kever Yang <kever.yang@xxxxxxxxxxxxxx>
---
 Documentation/devicetree/bindings/usb/dwc2.txt |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/dwc2.txt b/Documentation/devicetree/bindings/usb/dwc2.txt
index aa91034..eb80d7b 100644
--- a/Documentation/devicetree/bindings/usb/dwc2.txt
+++ b/Documentation/devicetree/bindings/usb/dwc2.txt
@@ -4,6 +4,9 @@ Platform DesignWare HS OTG USB 2.0 controller
 Required properties:
 - compatible : One of:
   - brcm,bcm2835-usb: The DWC2 USB controller instance in the BCM2835 SoC.
+  - rockchip,rk3066-usb: The DWC2 USB controller instance in the rk3066 Soc;
+  - "rockchip,rk3188-usb","rockchip,rk3066-usb": for rk3188 Soc;
+  - "rockchip,rk3288-usb","rockchip,rk3066-usb": for rk3288 Soc;
   - snps,dwc2: A generic DWC2 USB controller with default parameters.
 - reg : Should contain 1 register range (address and length)
 - interrupts : Should contain 1 interrupt
@@ -15,6 +18,8 @@ Optional properties:
 - phys: phy provider specifier
 - phy-names: shall be "usb2-phy"
 Refer to phy/phy-bindings.txt for generic phy consumer properties
+- dr_mode: shall be one of "host", "peripheral" and "otg"
+  Refer to usb/generic.txt
 
 Example:
 
-- 
1.7.9.5


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