[PATCH] phy: sun4i-usb: Fix build dependency

[Axel Lin]

of_usb_get_dr_mode_by_phy will not be compiled if !USB_COMMON, fix below
build error.

ERROR: "of_usb_get_dr_mode_by_phy" [drivers/phy/phy-sun4i-usb.ko] undefined!
scripts/Makefile.modpost:91: recipe for target '__modpost' failed
make[1]: *** [__modpost] Error 1

Signed-off-by: Axel Lin <axel.lin@xxxxxxxxxx>
---
 drivers/phy/Kconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index cc27c12..b65aba0 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -258,6 +258,8 @@ config PHY_SUN4I_USB
 	depends on RESET_CONTROLLER
 	depends on EXTCON
 	depends on POWER_SUPPLY
+	depends on USB_SUPPORT
+	select USB_COMMON
 	select GENERIC_PHY
 	help
 	  Enable this to support the transceiver that is part of Allwinner
-- 
2.7.4