usb: phy: Add STi USB2 PHY

This is the generic phy driver for the picoPHY ports
used by USB2/1.1 controllers. It is found on STiH407 SoC
family from STMicroelectronics.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 98f2a1b..3b9a09c 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -77,4 +77,12 @@
 	  This PHY is found on omap devices supporting SATA such as dra7, am57x
 	  and omap5
 
+config STI_USB_PHY
+	bool "STMicroelectronics USB2 picoPHY driver for STiH407 family"
+	depends on PHY && ARCH_STI
+	help
+	  This is the generic phy driver for the picoPHY ports
+	  used by USB2 and USB3 Host controllers available on
+	  STiH407 SoC families.
+
 endmenu