usb: renesas_usbhs: Add support for R-Car E2

This patch adds a compatible string to support for R-Car E2.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>" in patch 2
Signed-off-by: Felipe Balbi <balbi@ti.com>

Documentation/devicetree/bindings/usb/renesas_usbhs.txt

@@ -4,6 +4,7 @@ Required properties:
   - compatible: Must contain one of the following:
 	- "renesas,usbhs-r8a7790"
 	- "renesas,usbhs-r8a7791"
+	- "renesas,usbhs-r8a7794"
   - reg: Base address and length of the register for the USBHS
   - interrupts: Interrupt specifier for the USBHS
   - clocks: A list of phandle + clock specifier pairs

drivers/usb/renesas_usbhs/common.c

@@ -472,6 +472,10 @@ static const struct of_device_id usbhs_of_match[] = {
 		.compatible = "renesas,usbhs-r8a7791",
 		.data = (void *)USBHS_TYPE_RCAR_GEN2,
 	},
+	{
+		.compatible = "renesas,usbhs-r8a7794",
+		.data = (void *)USBHS_TYPE_RCAR_GEN2,
+	},
 	{ },
 };
 MODULE_DEVICE_TABLE(of, usbhs_of_match);