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phy: renesas: rcar-gen3-usb2: add regulator dependency

The driver start registering a regulator, but can still be
enabled even when it is unable to call into the regulator
subsystem:

aarch64-linux-ld: drivers/phy/renesas/phy-rcar-gen3-usb2.o: in function `rcar_gen3_phy_usb2_probe':
phy-rcar-gen3-usb2.c:(.text+0x2884): undefined reference to `devm_regulator_register'

Add a Kconfig dependency to avoid this configuration.

Fixes: b6d7dd157763 ("phy: renesas: rcar-gen3-usb2: Add regulator for OTG VBUS control")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
Link: https://patch.msgid.link/20260202095118.1233046-1-arnd@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

authored by

Arnd Bergmann and committed by
Vinod Koul 3a03a0e4 8a139684

+1
+1
drivers/phy/renesas/Kconfig
··· 29 29 depends on ARCH_RENESAS 30 30 depends on EXTCON || !EXTCON # if EXTCON=m, this cannot be built-in 31 31 depends on USB_SUPPORT 32 + depends on REGULATOR 32 33 select GENERIC_PHY 33 34 select MULTIPLEXER 34 35 select USB_COMMON