[PATCH] phy: meson-usb2: Fix build dependency

[Axel Lin]

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

drivers/built-in.o: In function `phy_meson_usb2_probe':
debugfs.c:(.text+0x76b4): undefined reference to `of_usb_get_dr_mode_by_phy'
Makefile:961: recipe for target 'vmlinux' failed
make: *** [vmlinux] 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 6ad87ec..cc27c12 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -458,6 +458,8 @@ config PHY_MESON_USB2
 	tristate "Meson USB2 PHY driver"
 	default ARCH_MESON
 	depends on OF && (ARCH_MESON || COMPILE_TEST)
+	depends on USB_SUPPORT
+	select USB_COMMON
 	select GENERIC_PHY
 	help
 	  Enable this to support the Meson USB2 PHYs found in Meson8b
-- 
2.7.4