diff --git a/drivers/usb/gadget/rcar/common.h b/drivers/usb/gadget/rcar/common.h
new file mode 100644
index 0000000..544cfd7
--- /dev/null
+++ b/drivers/usb/gadget/rcar/common.h
@@ -0,0 +1,328 @@
+/* SPDX-License-Identifier: GPL-1.0+ */
+/*
+ * Renesas USB driver
+ *
+ * Copyright (C) 2011 Renesas Solutions Corp.
+ * Copyright (C) 2019 Renesas Electronics Corporation
+ * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
+ */
+#ifndef RENESAS_USB_DRIVER_H
+#define RENESAS_USB_DRIVER_H
+
+#include <dm/device.h>
+#include <dm/device_compat.h>
+#include <linux/bug.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include "renesas_usb.h"
+
+struct usbhs_priv;
+
+#include "mod.h"
+#include "pipe.h"
+
+/*
+ *
+ *		register define
+ *
+ */
+#define SYSCFG		0x0000
+#define BUSWAIT		0x0002
+#define DVSTCTR		0x0008
+#define TESTMODE	0x000C
+#define CFIFO		0x0014
+#define CFIFOSEL	0x0020
+#define CFIFOCTR	0x0022
+#define D0FIFO		0x0100
+#define D0FIFOSEL	0x0028
+#define D0FIFOCTR	0x002A
+#define D1FIFO		0x0120
+#define D1FIFOSEL	0x002C
+#define D1FIFOCTR	0x002E
+#define INTENB0		0x0030
+#define INTENB1		0x0032
+#define BRDYENB		0x0036
+#define NRDYENB		0x0038
+#define BEMPENB		0x003A
+#define INTSTS0		0x0040
+#define INTSTS1		0x0042
+#define BRDYSTS		0x0046
+#define NRDYSTS		0x0048
+#define BEMPSTS		0x004A
+#define FRMNUM		0x004C
+#define USBREQ		0x0054	/* USB request type register */
+#define USBVAL		0x0056	/* USB request value register */
+#define USBINDX		0x0058	/* USB request index register */
+#define USBLENG		0x005A	/* USB request length register */
+#define DCPCFG		0x005C
+#define DCPMAXP		0x005E
+#define DCPCTR		0x0060
+#define PIPESEL		0x0064
+#define PIPECFG		0x0068
+#define PIPEBUF		0x006A
+#define PIPEMAXP	0x006C
+#define PIPEPERI	0x006E
+#define PIPEnCTR	0x0070
+#define PIPE1TRE	0x0090
+#define PIPE1TRN	0x0092
+#define PIPE2TRE	0x0094
+#define PIPE2TRN	0x0096
+#define PIPE3TRE	0x0098
+#define PIPE3TRN	0x009A
+#define PIPE4TRE	0x009C
+#define PIPE4TRN	0x009E
+#define PIPE5TRE	0x00A0
+#define PIPE5TRN	0x00A2
+#define PIPEBTRE	0x00A4
+#define PIPEBTRN	0x00A6
+#define PIPECTRE	0x00A8
+#define PIPECTRN	0x00AA
+#define PIPEDTRE	0x00AC
+#define PIPEDTRN	0x00AE
+#define PIPEETRE	0x00B0
+#define PIPEETRN	0x00B2
+#define PIPEFTRE	0x00B4
+#define PIPEFTRN	0x00B6
+#define PIPE9TRE	0x00B8
+#define PIPE9TRN	0x00BA
+#define PIPEATRE	0x00BC
+#define PIPEATRN	0x00BE
+#define DEVADD0		0x00D0 /* Device address n configuration */
+#define DEVADD1		0x00D2
+#define DEVADD2		0x00D4
+#define DEVADD3		0x00D6
+#define DEVADD4		0x00D8
+#define DEVADD5		0x00DA
+#define DEVADD6		0x00DC
+#define DEVADD7		0x00DE
+#define DEVADD8		0x00E0
+#define DEVADD9		0x00E2
+#define DEVADDA		0x00E4
+#define D2FIFOSEL	0x00F0	/* for R-Car Gen2 */
+#define D2FIFOCTR	0x00F2	/* for R-Car Gen2 */
+#define D3FIFOSEL	0x00F4	/* for R-Car Gen2 */
+#define D3FIFOCTR	0x00F6	/* for R-Car Gen2 */
+#define SUSPMODE	0x0102	/* for RZ/A */
+
+/* SYSCFG */
+#define SCKE	(1 << 10)	/* USB Module Clock Enable */
+#define CNEN	(1 << 8)	/* Single-ended receiver operation Enable */
+#define HSE	(1 << 7)	/* High-Speed Operation Enable */
+#define DCFM	(1 << 6)	/* Controller Function Select */
+#define DRPD	(1 << 5)	/* D+ Line/D- Line Resistance Control */
+#define DPRPU	(1 << 4)	/* D+ Line Resistance Control */
+#define USBE	(1 << 0)	/* USB Module Operation Enable */
+#define UCKSEL	(1 << 2)	/* Clock Select for RZ/A1 */
+#define UPLLE	(1 << 1)	/* USB PLL Enable for RZ/A1 */
+
+/* DVSTCTR */
+#define EXTLP	(1 << 10)	/* Controls the EXTLP pin output state */
+#define PWEN	(1 << 9)	/* Controls the PWEN pin output state */
+#define USBRST	(1 << 6)	/* Bus Reset Output */
+#define UACT	(1 << 4)	/* USB Bus Enable */
+#define RHST	(0x7)		/* Reset Handshake */
+#define  RHST_LOW_SPEED  1	/* Low-speed connection */
+#define  RHST_FULL_SPEED 2	/* Full-speed connection */
+#define  RHST_HIGH_SPEED 3	/* High-speed connection */
+
+/* CFIFOSEL */
+#define DREQE	(1 << 12)	/* DMA Transfer Request Enable */
+#define MBW_32	(0x2 << 10)	/* CFIFO Port Access Bit Width */
+
+/* CFIFOCTR */
+#define BVAL	(1 << 15)	/* Buffer Memory Enable Flag */
+#define BCLR	(1 << 14)	/* CPU buffer clear */
+#define FRDY	(1 << 13)	/* FIFO Port Ready */
+#define DTLN_MASK (0x0FFF)	/* Receive Data Length */
+
+/* INTENB0 */
+#define VBSE	(1 << 15)	/* Enable IRQ VBUS_0 and VBUSIN_0 */
+#define RSME	(1 << 14)	/* Enable IRQ Resume */
+#define SOFE	(1 << 13)	/* Enable IRQ Frame Number Update */
+#define DVSE	(1 << 12)	/* Enable IRQ Device State Transition */
+#define CTRE	(1 << 11)	/* Enable IRQ Control Stage Transition */
+#define BEMPE	(1 << 10)	/* Enable IRQ Buffer Empty */
+#define NRDYE	(1 << 9)	/* Enable IRQ Buffer Not Ready Response */
+#define BRDYE	(1 << 8)	/* Enable IRQ Buffer Ready */
+
+/* INTENB1 */
+#define BCHGE	(1 << 14)	/* USB Bus Change Interrupt Enable */
+#define DTCHE	(1 << 12)	/* Disconnection Detect Interrupt Enable */
+#define ATTCHE	(1 << 11)	/* Connection Detect Interrupt Enable */
+#define EOFERRE	(1 << 6)	/* EOF Error Detect Interrupt Enable */
+#define SIGNE	(1 << 5)	/* Setup Transaction Error Interrupt Enable */
+#define SACKE	(1 << 4)	/* Setup Transaction ACK Interrupt Enable */
+
+/* INTSTS0 */
+#define VBINT	(1 << 15)	/* VBUS0_0 and VBUS1_0 Interrupt Status */
+#define DVST	(1 << 12)	/* Device State Transition Interrupt Status */
+#define CTRT	(1 << 11)	/* Control Stage Interrupt Status */
+#define BEMP	(1 << 10)	/* Buffer Empty Interrupt Status */
+#define BRDY	(1 << 8)	/* Buffer Ready Interrupt Status */
+#define VBSTS	(1 << 7)	/* VBUS_0 and VBUSIN_0 Input Status */
+#define VALID	(1 << 3)	/* USB Request Receive */
+
+#define DVSQ_MASK		(0x7 << 4)	/* Device State */
+#define  POWER_STATE		(0 << 4)
+#define  DEFAULT_STATE		(1 << 4)
+#define  ADDRESS_STATE		(2 << 4)
+#define  CONFIGURATION_STATE	(3 << 4)
+#define  SUSPENDED_STATE	(4 << 4)
+
+#define CTSQ_MASK		(0x7)	/* Control Transfer Stage */
+#define  IDLE_SETUP_STAGE	0	/* Idle stage or setup stage */
+#define  READ_DATA_STAGE	1	/* Control read data stage */
+#define  READ_STATUS_STAGE	2	/* Control read status stage */
+#define  WRITE_DATA_STAGE	3	/* Control write data stage */
+#define  WRITE_STATUS_STAGE	4	/* Control write status stage */
+#define  NODATA_STATUS_STAGE	5	/* Control write NoData status stage */
+#define  SEQUENCE_ERROR		6	/* Control transfer sequence error */
+
+/* INTSTS1 */
+#define OVRCR	(1 << 15) /* OVRCR Interrupt Status */
+#define BCHG	(1 << 14) /* USB Bus Change Interrupt Status */
+#define DTCH	(1 << 12) /* USB Disconnection Detect Interrupt Status */
+#define ATTCH	(1 << 11) /* ATTCH Interrupt Status */
+#define EOFERR	(1 << 6)  /* EOF Error Detect Interrupt Status */
+#define SIGN	(1 << 5)  /* Setup Transaction Error Interrupt Status */
+#define SACK	(1 << 4)  /* Setup Transaction ACK Response Interrupt Status */
+
+/* PIPECFG */
+/* DCPCFG */
+#define TYPE_NONE	(0 << 14)	/* Transfer Type */
+#define TYPE_BULK	(1 << 14)
+#define TYPE_INT	(2 << 14)
+#define TYPE_ISO	(3 << 14)
+#define BFRE		(1 << 10)	/* BRDY Interrupt Operation Spec. */
+#define DBLB		(1 << 9)	/* Double Buffer Mode */
+#define SHTNAK		(1 << 7)	/* Pipe Disable in Transfer End */
+#define DIR_OUT		(1 << 4)	/* Transfer Direction */
+
+/* PIPEMAXP */
+/* DCPMAXP */
+#define DEVSEL_MASK	(0xF << 12)	/* Device Select */
+#define DCP_MAXP_MASK	(0x7F)
+#define PIPE_MAXP_MASK	(0x7FF)
+
+/* PIPEBUF */
+#define BUFSIZE_SHIFT	10
+#define BUFSIZE_MASK	(0x1F << BUFSIZE_SHIFT)
+#define BUFNMB_MASK	(0xFF)
+
+/* PIPEnCTR */
+/* DCPCTR */
+#define BSTS		(1 << 15)	/* Buffer Status */
+#define SUREQ		(1 << 14)	/* Sending SETUP Token */
+#define INBUFM		(1 << 14)	/* (PIPEnCTR) Transfer Buffer Monitor */
+#define CSSTS		(1 << 12)	/* CSSTS Status */
+#define	ACLRM		(1 << 9)	/* Buffer Auto-Clear Mode */
+#define SQCLR		(1 << 8)	/* Toggle Bit Clear */
+#define SQSET		(1 << 7)	/* Toggle Bit Set */
+#define SQMON		(1 << 6)	/* Toggle Bit Check */
+#define PBUSY		(1 << 5)	/* Pipe Busy */
+#define PID_MASK	(0x3)		/* Response PID */
+#define  PID_NAK	0
+#define  PID_BUF	1
+#define  PID_STALL10	2
+#define  PID_STALL11	3
+
+#define CCPL		(1 << 2)	/* Control Transfer End Enable */
+
+/* PIPEnTRE */
+#define TRENB		(1 << 9)	/* Transaction Counter Enable */
+#define TRCLR		(1 << 8)	/* Transaction Counter Clear */
+
+/* FRMNUM */
+#define FRNM_MASK	(0x7FF)
+
+/* DEVADDn */
+#define UPPHUB(x)	(((x) & 0xF) << 11)	/* HUB Register */
+#define HUBPORT(x)	(((x) & 0x7) << 8)	/* HUB Port for Target Device */
+#define USBSPD(x)	(((x) & 0x3) << 6)	/* Device Transfer Rate */
+#define USBSPD_SPEED_LOW	0x1
+#define USBSPD_SPEED_FULL	0x2
+#define USBSPD_SPEED_HIGH	0x3
+
+/* SUSPMODE */
+#define SUSPM		(1 << 14)	/* SuspendM Control */
+
+/*
+ *		struct
+ */
+struct usbhs_priv {
+	void __iomem *base;
+	struct renesas_usbhs_driver_param	dparam;
+	struct platform_device			*pdev;
+
+	/*
+	 * module control
+	 */
+	struct usbhs_mod_info mod_info;
+
+	/*
+	 * pipe control
+	 */
+	struct usbhs_pipe_info pipe_info;
+
+	/*
+	 * fifo control
+	 */
+	struct usbhs_fifo_info fifo_info;
+};
+
+/*
+ * common
+ */
+u16 usbhs_read(struct usbhs_priv *priv, u32 reg);
+void usbhs_write(struct usbhs_priv *priv, u32 reg, u16 data);
+void usbhs_bset(struct usbhs_priv *priv, u32 reg, u16 mask, u16 data);
+
+#define usbhs_lock(p, f) spin_lock_irqsave(usbhs_priv_to_lock(p), f)
+#define usbhs_unlock(p, f) spin_unlock_irqrestore(usbhs_priv_to_lock(p), f)
+
+/*
+ * sysconfig
+ */
+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_function_pullup(struct usbhs_priv *priv, int enable);
+void usbhs_sys_set_test_mode(struct usbhs_priv *priv, u16 mode);
+
+/*
+ * usb request
+ */
+void usbhs_usbreq_get_val(struct usbhs_priv *priv, struct usb_ctrlrequest *req);
+void usbhs_usbreq_set_val(struct usbhs_priv *priv, struct usb_ctrlrequest *req);
+
+/*
+ * bus
+ */
+void usbhs_bus_send_sof_enable(struct usbhs_priv *priv);
+void usbhs_bus_send_reset(struct usbhs_priv *priv);
+int usbhs_bus_get_speed(struct usbhs_priv *priv);
+int usbhs_vbus_ctrl(struct usbhs_priv *priv, int enable);
+void usbhsc_hotplug(struct usbhs_priv *priv);
+
+/*
+ * frame
+ */
+int usbhs_frame_get_num(struct usbhs_priv *priv);
+
+/*
+ * device config
+ */
+int usbhs_set_device_config(struct usbhs_priv *priv, int devnum, u16 upphub,
+			   u16 hubport, u16 speed);
+
+/*
+ * interrupt functions
+ */
+void usbhs_xxxsts_clear(struct usbhs_priv *priv, u16 sts_reg, u16 bit);
+
+/*
+ * data
+ */
+#define usbhs_get_dparam(priv, param)	(priv->dparam.param)
+#define usbhs_priv_to_dev(priv)		(&priv->pdev->dev)
+
+#endif /* RENESAS_USB_DRIVER_H */