usb: ulpi: Add Kconfig options for ULPI

The following options can be now enabled via defconfig:
- CONFIG_USB_ULPI
- CONFIG_USB_ULPI_VIEWPORT
- CONFIG_USB_ULPI_VIEWPORT_OMAP

Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Marek Vasut <marex@denx.de>

drivers/usb/Kconfig

@@ -53,6 +53,8 @@ source "drivers/usb/musb-new/Kconfig"
 
 source "drivers/usb/emul/Kconfig"
 
+source "drivers/usb/ulpi/Kconfig"
+
 comment "USB peripherals"
 
 config USB_STORAGE

drivers/usb/ulpi/Kconfig

+comment "ULPI drivers"
+
+choice
+	prompt "ULPI Viewport type"
+	optional
+	default n
+	help
+	  Select ULPI viewport (SoC-side interface to ULPI) implementation
+	  appropriate for the device if you want to communicate with
+	  UTMI (USB PHY) via ULPI interface.
+
+config USB_ULPI_VIEWPORT
+	bool "Generic ULPI Viewport"
+	help
+	  Support generic ULPI Viewport implementation that is used on
+	  some Tegra and Snapdragon devices.
+
+config USB_ULPI_VIEWPORT_OMAP
+	bool "OMAP ULPI Viewport"
+	help
+	  Support ULPI Viewport implementation that is used on OMAP devices.
+
+endchoice
+
+config USB_ULPI
+	bool "ULPI support"
+	depends on (USB_ULPI_VIEWPORT || USB_ULPI_VIEWPORT_OMAP)
+	help
+	  Select to commnicate with USB PHY via ULPI interface.
+	  ULPI is wrapper on UTMI+ core that is used as
+	  PHY Transreceiver for USB controllers.
+
+	  This driver uses ULPI viewports that are specific for each SoC.