Banana Pi R1 UART3 CTS/RTS and DTB

Dear All,

I am just trying to figure how to enable the UART3 to be a 4 wire serial port for Lamobo R1 board. 

As per the datasheet here, 

https://drive.google.com/file/d/0B4PAo2nW2KfnNTBaVENGeHZfSzA/view

UART3 4 wire signals are routed to J12 connector.

I was looking to modify .dtb file, when I realize there is a definitions for PH3 GPIO under DTB file such as

			usb2_vbus_pin@0 {
				allwinner,pins = "PH3";
				allwinner,function = "gpio_out";
				allwinner,drive = <0x0>;
				allwinner,pull = <0x0>;
				linux,phandle = <0x42>;
				phandle = <0x42>;
			};

PH2 is not defined, looking at schematic I cannot find how VBUS for USB2 works or is connected and how it affects changing the DTB of UART3 such as or if it will actually work as 4 wire UART by doing so.

			uart3@0 {
				allwinner,pins = "PH0", "PH1", "PH2", "PH3";
				allwinner,function = "uart3";
				allwinner,drive = <0x0>;
				allwinner,pull = <0x0>;
			};

I really will appreciate any comment,

Tkx in advance,