Following error showed up:

drivers/phy/renesas/phy-rcar-gen3-usb2.o: In function 
`rcar_gen3_phy_usb2_probe':
/work/tools/linux/drivers/phy/renesas/phy-rcar-gen3-usb2.c:444: undefined 
reference to `of_usb_get_dr_mode_by_phy'
Makefile:993: recipe for target 'vmlinux' failed
make: *** [vmlinux] Error 1

with CONFIG_USB_SUPPORT=n

Add dependency on USB_SUPPORT and select USB_COMMON to make sure that
of_usb_get_dr_mode_by_phy() is available.

Signed-off-by: Vladimir Murzin <vladimir.mur...@arm.com>
---
 drivers/phy/renesas/Kconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/phy/renesas/Kconfig b/drivers/phy/renesas/Kconfig
index cb09245..c845fac 100644
--- a/drivers/phy/renesas/Kconfig
+++ b/drivers/phy/renesas/Kconfig
@@ -12,7 +12,9 @@ config PHY_RCAR_GEN3_USB2
        tristate "Renesas R-Car generation 3 USB 2.0 PHY driver"
        depends on ARCH_RENESAS
        depends on EXTCON
+       depends on USB_SUPPORT
        select GENERIC_PHY
+       select USB_COMMON
        help
          Support for USB 2.0 PHY found on Renesas R-Car generation 3 SoCs.
 
-- 
1.9.1

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