usb: host: xhci: rcar: add a new firmware version for r8a7796

This patch adds a new firmware version "V3" for r8a7796. This patch
also adds explanation of each version's information.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/host/xhci-rcar.c b/drivers/usb/host/xhci-rcar.c
index 0e4535e..ced4a76 100644
--- a/drivers/usb/host/xhci-rcar.c
+++ b/drivers/usb/host/xhci-rcar.c
@@ -19,6 +19,8 @@
 #include "xhci-rcar.h"
 
 /*
+* - The V3 firmware is for r8a7796 (with good performance).
+* - The V2 firmware can be used on both r8a7795 (es1.x) and r8a7796.
 * - The V2 firmware is possible to use on R-Car Gen2. However, the V2 causes
 *   performance degradation. So, this driver continues to use the V1 if R-Car
 *   Gen2.
@@ -26,6 +28,7 @@
 */
 MODULE_FIRMWARE(XHCI_RCAR_FIRMWARE_NAME_V1);
 MODULE_FIRMWARE(XHCI_RCAR_FIRMWARE_NAME_V2);
+MODULE_FIRMWARE(XHCI_RCAR_FIRMWARE_NAME_V3);
 
 /*** Register Offset ***/
 #define RCAR_USB3_INT_ENA	0x224	/* Interrupt Enable */