diff --git a/arch/arm/cpu/arm926ejs/davinci/psc.c b/arch/arm/cpu/arm926ejs/davinci/psc.c
index 3e92518..2ffb42a 100644
--- a/arch/arm/cpu/arm926ejs/davinci/psc.c
+++ b/arch/arm/cpu/arm926ejs/davinci/psc.c
@@ -128,6 +128,11 @@
 	lpsc_transition(id, 0x01);
 }
 
+void lpsc_disable(unsigned int id)
+{
+	lpsc_transition(id, 0x0);
+}
+
 /* Not all DaVinci chips have a DSP power domain. */
 #ifdef CONFIG_SOC_DM644X
 
diff --git a/arch/arm/include/asm/arch-davinci/da8xx-usb.h b/arch/arm/include/asm/arch-davinci/da8xx-usb.h
new file mode 100644
index 0000000..eb79bf8
--- /dev/null
+++ b/arch/arm/include/asm/arch-davinci/da8xx-usb.h
@@ -0,0 +1,105 @@
+/*
+ * da8xx-usb.h -- TI's DA8xx platform specific usb wrapper definitions.
+ *
+ * Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
+ *
+ * Based on drivers/usb/musb/davinci.h
+ *
+ * Copyright (C) 2009 Texas Instruments Incorporated
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#ifndef __DA8XX_MUSB_H__
+#define __DA8XX_MUSB_H__
+
+#include <asm/arch/hardware.h>
+#include <asm/arch/gpio.h>
+
+/* Base address of da8xx usb0 wrapper */
+#define DA8XX_USB_OTG_BASE  0x01E00000
+
+/* Base address of da8xx musb core */
+#define DA8XX_USB_OTG_CORE_BASE (DA8XX_USB_OTG_BASE + 0x400)
+
+/* Timeout for DA8xx usb module */
+#define DA8XX_USB_OTG_TIMEOUT 0x3FFFFFF
+
+/*
+ * DA8xx platform USB wrapper register overlay.
+ */
+struct da8xx_usb_regs {
+	dv_reg	revision;
+	dv_reg	control;
+	dv_reg 	status;
+	dv_reg 	emulation;
+	dv_reg 	mode;
+	dv_reg 	autoreq;
+	dv_reg 	srpfixtime;
+	dv_reg 	teardown;
+	dv_reg 	intsrc;
+	dv_reg 	intsrc_set;
+	dv_reg 	intsrc_clr;
+	dv_reg 	intmsk;
+	dv_reg 	intmsk_set;
+	dv_reg 	intmsk_clr;
+	dv_reg 	intsrcmsk;
+	dv_reg 	eoi;
+	dv_reg 	intvector;
+	dv_reg 	grndis_size[4];
+};
+
+#define da8xx_usb_regs ((struct da8xx_usb_regs *)DA8XX_USB_OTG_BASE)
+
+/* DA8XX interrupt bits definitions */
+#define DA8XX_USB_TX_ENDPTS_MASK  0x1f	/* ep0 + 4 tx */
+#define DA8XX_USB_RX_ENDPTS_MASK  0x1e	/* 4 rx */
+#define DA8XX_USB_TXINT_SHIFT	  0
+#define DA8XX_USB_RXINT_SHIFT	  8
+
+#define DA8XX_USB_USBINT_MASK	  0x01ff0000	/* 8 Mentor, DRVVBUS */
+#define DA8XX_USB_TXINT_MASK \
+		(DA8XX_USB_TX_ENDPTS_MASK << DA8XX_USB_TXINT_SHIFT)
+#define DA8XX_USB_RXINT_MASK \
+		(DA8XX_USB_RX_ENDPTS_MASK << DA8XX_USB_RXINT_SHIFT)
+
+/* DA8xx CFGCHIP2 (USB 2.0 PHY Control) register bits */
+#define CFGCHIP2_PHYCLKGD	(1 << 17)
+#define CFGCHIP2_VBUSSENSE	(1 << 16)
+#define CFGCHIP2_RESET		(1 << 15)
+#define CFGCHIP2_OTGMODE	(3 << 13)
+#define CFGCHIP2_NO_OVERRIDE	(0 << 13)
+#define CFGCHIP2_FORCE_HOST	(1 << 13)
+#define CFGCHIP2_FORCE_DEVICE 	(2 << 13)
+#define CFGCHIP2_FORCE_HOST_VBUS_LOW (3 << 13)
+#define CFGCHIP2_USB1PHYCLKMUX	(1 << 12)
+#define CFGCHIP2_USB2PHYCLKMUX	(1 << 11)
+#define CFGCHIP2_PHYPWRDN	(1 << 10)
+#define CFGCHIP2_OTGPWRDN	(1 << 9)
+#define CFGCHIP2_DATPOL 	(1 << 8)
+#define CFGCHIP2_USB1SUSPENDM	(1 << 7)
+#define CFGCHIP2_PHY_PLLON	(1 << 6)	/* override PLL suspend */
+#define CFGCHIP2_SESENDEN	(1 << 5)	/* Vsess_end comparator */
+#define CFGCHIP2_VBDTCTEN	(1 << 4)	/* Vbus comparator */
+#define CFGCHIP2_REFFREQ	(0xf << 0)
+#define CFGCHIP2_REFFREQ_12MHZ	(1 << 0)
+#define CFGCHIP2_REFFREQ_24MHZ	(2 << 0)
+#define CFGCHIP2_REFFREQ_48MHZ	(3 << 0)
+
+#define DA8XX_USB_VBUS_GPIO	(1 << 15)
+
+int usb_phy_on(void);
+void usb_phy_off(void);
+
+#endif	/* __DA8XX_MUSB_H__ */
diff --git a/arch/arm/include/asm/arch-davinci/hardware.h b/arch/arm/include/asm/arch-davinci/hardware.h
index 5267973..6eed6c9 100644
--- a/arch/arm/include/asm/arch-davinci/hardware.h
+++ b/arch/arm/include/asm/arch-davinci/hardware.h
@@ -306,6 +306,7 @@
 
 void lpsc_on(unsigned int id);
 void lpsc_syncreset(unsigned int id);
+void lpsc_disable(unsigned int id);
 void dsp_on(void);
 
 void davinci_enable_uart0(void);