usb: dwc3: add rockchip specific glue layer

Add rockchip specific glue layer to support USB3 Peripheral mode
and Host mode on rockchip platforms (e.g. rk3399).

The DesignWare USB3 integrated in rockchip SoCs is a configurable
IP Core which can be instantiated as Dual-Role Device (DRD), Host
Only (XHCI) and Peripheral Only configurations.

We use extcon notifier to manage usb cable detection and mode switch.
Enable DWC3 PM runtime auto suspend to allow core enter runtime_suspend
if USB cable is dettached. For host mode, it requires to keep whole
DWC3 controller in reset state to hold pipe power state in P2 before
initializing PHY. And it need to reconfigure USB PHY interface of DWC3
core after deassert DWC3 controller reset.

The current driver supports Host only and Peripheral Only well, for
now, we will add support for OTG after we have it all stabilized.

Change-Id: I821dd19eedec73e6517f0cca184f939a9f313904
Signed-off-by: William Wu <william.wu@rock-chips.com>

drivers/usb/dwc3/Kconfig

@@ -102,6 +102,14 @@ config USB_DWC3_OF_SIMPLE
 	 Currently supports Xilinx and Qualcomm DWC USB3 IP.
 	 Say 'Y' or 'M' if you have one such device.
 
+config USB_DWC3_ROCKCHIP
+       tristate "Rockchip Platforms"
+       depends on EXTCON && (ARCH_ROCKCHIP || COMPILE_TEST)
+       depends on OF
+       default USB_DWC3
+       help
+         Support of USB2/3 functionality in Rockchip
+
 config USB_DWC3_ST
 	tristate "STMicroelectronics Platforms"
 	depends on (ARCH_STI || COMPILE_TEST) && OF

drivers/usb/dwc3/Makefile

@@ -48,5 +48,6 @@ obj-$(CONFIG_USB_DWC3_PCI)		+= dwc3-pci.o
 obj-$(CONFIG_USB_DWC3_HAPS)		+= dwc3-haps.o
 obj-$(CONFIG_USB_DWC3_KEYSTONE)		+= dwc3-keystone.o
 obj-$(CONFIG_USB_DWC3_OF_SIMPLE)	+= dwc3-of-simple.o
+obj-$(CONFIG_USB_DWC3_ROCKCHIP)		+= dwc3-rockchip.o
 obj-$(CONFIG_USB_DWC3_ST)		+= dwc3-st.o
 obj-$(CONFIG_USB_DWC3_QCOM)		+= dwc3-qcom.o