[PATCH] phy: add dm816x dependency on USB_PHY

[Arnd Bergmann]

The newly added phy-dm816x-usb driver depends on the
usb phy API and fails to link if that is disabled:

drivers/built-in.o: In function `dm816x_usb_phy_remove':
:(.text+0x3a28): undefined reference to `usb_remove_phy'
drivers/built-in.o: In function `dm816x_usb_phy_probe':
:(.text+0x3c18): undefined reference to `usb_add_phy_dev'

This adds an explicit dependency in Kconfig to avoid the
build error in randconfig tests.

Signed-off-by: Arnd Bergmann <arnd at arndb.de>
Fixes: 609adde838f4 ("phy: Add a driver for dm816x USB PHY")

diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index fceac96c2a31..1b5c235562c9 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -37,7 +37,7 @@ config ARMADA375_USBCLUSTER_PHY
 
 config PHY_DM816X_USB
 	tristate "TI dm816x USB PHY driver"
-	depends on ARCH_OMAP2PLUS
+	depends on ARCH_OMAP2PLUS && USB_PHY
 	select GENERIC_PHY
 	help
 	  Enable this for dm816x USB to work.