phy: rockchip: Add Rockchip USB2PHY driver

Add Rockchip USB2PHY driver with initial support.

This will help to use it for EHCI controller in host
mode, and USB 3.0 controller in otg mode.

More functionality like charge, vbus detection will
add it in future changes.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/drivers/phy/rockchip/Kconfig b/drivers/phy/rockchip/Kconfig
new file mode 100644
index 0000000..d73ac69
--- /dev/null
+++ b/drivers/phy/rockchip/Kconfig
@@ -0,0 +1,14 @@
+#
+# Phy drivers for Rockchip platforms
+#
+
+menu "Rockchip PHY driver"
+
+config PHY_ROCKCHIP_INNO_USB2
+	bool "Rockchip INNO USB2PHY Driver"
+	depends on ARCH_ROCKCHIP
+	select PHY
+	help
+	  Support for Rockchip USB2.0 PHY with Innosilicon IP block.
+
+endmenu