usb: renesas_usbhs: add test-mode support

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/renesas_usbhs/common.h b/drivers/usb/renesas_usbhs/common.h
index 71c295c..d79b3e2 100644
--- a/drivers/usb/renesas_usbhs/common.h
+++ b/drivers/usb/renesas_usbhs/common.h
@@ -33,6 +33,7 @@
 #define SYSCFG		0x0000
 #define BUSWAIT		0x0002
 #define DVSTCTR		0x0008
+#define TESTMODE	0x000C
 #define CFIFO		0x0014
 #define CFIFOSEL	0x0020
 #define CFIFOCTR	0x0022
@@ -283,6 +284,7 @@
  */
 void usbhs_sys_host_ctrl(struct usbhs_priv *priv, int enable);
 void usbhs_sys_function_ctrl(struct usbhs_priv *priv, int enable);
+void usbhs_sys_set_test_mode(struct usbhs_priv *priv, u16 mode);
 
 /*
  * usb request