[PATCH] phy: sun9i-usb: add USB dependency

[Arnd Bergmann]

The sun9i usb phy driver calls of_usb_get_phy_mode(), which is not
available if USB is disabled:

drivers/built-in.o: In function `sun9i_usb_phy_probe':
:(.text+0x7fb0): undefined reference to `of_usb_get_phy_mode'

This adds a dependency to avoid the randconfig build errors.

Signed-off-by: Arnd Bergmann <arnd at arndb.de>
Fixes: 9c3b44302636 ("phy: Add driver to support individual USB PHYs on sun9i")

diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 7eb5859dd035..03cb3ea2d2c0 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -233,6 +233,7 @@ config PHY_SUN9I_USB
 	tristate "Allwinner sun9i SoC USB PHY driver"
 	depends on ARCH_SUNXI && HAS_IOMEM && OF
 	depends on RESET_CONTROLLER
+	depends on USB_COMMON
 	select GENERIC_PHY
 	help
 	  Enable this to support the transceiver that is part of Allwinner