phy: rcar: Add R-Car Gen2 PHY driver

Add a PHY driver for the R-Car Gen2 which allows configuring the mux
connected to the EHCI controllers and USBHS controller.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 8fc2295..e0822bb 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -110,6 +110,14 @@
 	  used by USB2 and USB3 Host controllers available on
 	  STiH407 SoC families.
 
+config PHY_RCAR_GEN2
+	tristate "Renesas R-Car Gen2 USB PHY"
+	depends on PHY && RCAR_GEN2
+	help
+	  Support for the Renesas R-Car Gen2 USB PHY. This driver operates the
+	  PHY connected to USBHS module, PCI EHCI module and USB3.0 module and
+	  allows configuring the module multiplexing.
+
 config PHY_STM32_USBPHYC
 	tristate "STMicroelectronics STM32 SoC USB HS PHY driver"
 	depends on PHY && ARCH_STM32MP