diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index 1fce382..da7d536 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -57,8 +57,9 @@
 # Power Management
 ifeq ($(CONFIG_PM),y)
 obj-$(CONFIG_ARCH_OMAP2)		+= pm24xx.o
-obj-$(CONFIG_ARCH_OMAP2)		+= sleep24xx.o pm_bus.o
-obj-$(CONFIG_ARCH_OMAP3)		+= pm34xx.o sleep34xx.o cpuidle34xx.o pm_bus.o
+obj-$(CONFIG_ARCH_OMAP2)		+= sleep24xx.o pm_bus.o voltage.o
+obj-$(CONFIG_ARCH_OMAP3)		+= pm34xx.o sleep34xx.o voltage.o \
+					   cpuidle34xx.o pm_bus.o
 obj-$(CONFIG_ARCH_OMAP4)		+= pm44xx.o pm_bus.o
 obj-$(CONFIG_PM_DEBUG)			+= pm-debug.o
 
diff --git a/arch/arm/mach-omap2/control.h b/arch/arm/mach-omap2/control.h
index 1ddc83b..b3df5c3 100644
--- a/arch/arm/mach-omap2/control.h
+++ b/arch/arm/mach-omap2/control.h
@@ -148,6 +148,15 @@
 #define OMAP343X_CONTROL_TEST_KEY_11	(OMAP2_CONTROL_GENERAL + 0x00f4)
 #define OMAP343X_CONTROL_TEST_KEY_12	(OMAP2_CONTROL_GENERAL + 0x00f8)
 #define OMAP343X_CONTROL_TEST_KEY_13	(OMAP2_CONTROL_GENERAL + 0x00fc)
+#define OMAP343X_CONTROL_FUSE_OPP1_VDD1 (OMAP2_CONTROL_GENERAL + 0x0110)
+#define OMAP343X_CONTROL_FUSE_OPP2_VDD1 (OMAP2_CONTROL_GENERAL + 0x0114)
+#define OMAP343X_CONTROL_FUSE_OPP3_VDD1 (OMAP2_CONTROL_GENERAL + 0x0118)
+#define OMAP343X_CONTROL_FUSE_OPP4_VDD1 (OMAP2_CONTROL_GENERAL + 0x011c)
+#define OMAP343X_CONTROL_FUSE_OPP5_VDD1 (OMAP2_CONTROL_GENERAL + 0x0120)
+#define OMAP343X_CONTROL_FUSE_OPP1_VDD2 (OMAP2_CONTROL_GENERAL + 0x0124)
+#define OMAP343X_CONTROL_FUSE_OPP2_VDD2 (OMAP2_CONTROL_GENERAL + 0x0128)
+#define OMAP343X_CONTROL_FUSE_OPP3_VDD2 (OMAP2_CONTROL_GENERAL + 0x012c)
+#define OMAP343X_CONTROL_FUSE_SR        (OMAP2_CONTROL_GENERAL + 0x0130)
 #define OMAP343X_CONTROL_IVA2_BOOTADDR	(OMAP2_CONTROL_GENERAL + 0x0190)
 #define OMAP343X_CONTROL_IVA2_BOOTMOD	(OMAP2_CONTROL_GENERAL + 0x0194)
 #define OMAP343X_CONTROL_DEBOBS(i)	(OMAP2_CONTROL_GENERAL + 0x01B0 \
@@ -164,6 +173,14 @@
 #define OMAP343X_CONTROL_SRAMLDO5	(OMAP2_CONTROL_GENERAL + 0x02C0)
 #define OMAP343X_CONTROL_CSI		(OMAP2_CONTROL_GENERAL + 0x02C4)
 
+/* OMAP3630 only CONTROL_GENERAL register offsets */
+#define OMAP3630_CONTROL_FUSE_OPP1G_VDD1        (OMAP2_CONTROL_GENERAL + 0x0110)
+#define OMAP3630_CONTROL_FUSE_OPP50_VDD1        (OMAP2_CONTROL_GENERAL + 0x0114)
+#define OMAP3630_CONTROL_FUSE_OPP100_VDD1       (OMAP2_CONTROL_GENERAL + 0x0118)
+#define OMAP3630_CONTROL_FUSE_OPP120_VDD1       (OMAP2_CONTROL_GENERAL + 0x0120)
+#define OMAP3630_CONTROL_FUSE_OPP50_VDD2        (OMAP2_CONTROL_GENERAL + 0x0128)
+#define OMAP3630_CONTROL_FUSE_OPP100_VDD2       (OMAP2_CONTROL_GENERAL + 0x012C)
+
 /* AM35XX only CONTROL_GENERAL register offsets */
 #define AM35XX_CONTROL_MSUSPENDMUX_6    (OMAP2_CONTROL_GENERAL + 0x0038)
 #define AM35XX_CONTROL_DEVCONF2         (OMAP2_CONTROL_GENERAL + 0x0310)
diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c
index 9b1db59..e828616 100644
--- a/arch/arm/mach-omap2/pm.c
+++ b/arch/arm/mach-omap2/pm.c
@@ -17,6 +17,7 @@
 #include <plat/omap-pm.h>
 #include <plat/omap_device.h>
 #include <plat/common.h>
+#include <plat/voltage.h>
 
 #include "powerdomain.h"
 #include "clockdomain.h"
@@ -163,3 +164,10 @@
 }
 postcore_initcall(omap2_common_pm_init);
 
+static int __init omap2_common_pm_late_init(void)
+{
+	omap_voltage_late_init();
+
+	return 0;
+}
+late_initcall(omap2_common_pm_late_init);
diff --git a/arch/arm/mach-omap2/voltage.c b/arch/arm/mach-omap2/voltage.c
new file mode 100644
index 0000000..875667f
--- /dev/null
+++ b/arch/arm/mach-omap2/voltage.c
@@ -0,0 +1,1226 @@
+/*
+ * OMAP3/OMAP4 Voltage Management Routines
+ *
+ * Author: Thara Gopinath	<thara@ti.com>
+ *
+ * Copyright (C) 2007 Texas Instruments, Inc.
+ * Rajendra Nayak <rnayak@ti.com>
+ * Lesly A M <x0080970@ti.com>
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ * Kalle Jokiniemi
+ *
+ * Copyright (C) 2010 Texas Instruments, Inc.
+ * Thara Gopinath <thara@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/debugfs.h>
+#include <linux/slab.h>
+
+#include <plat/common.h>
+#include <plat/voltage.h>
+
+#include "prm-regbits-34xx.h"
+#include "control.h"
+
+#define VP_IDLE_TIMEOUT		200
+#define VP_TRANXDONE_TIMEOUT	300
+#define VOLTAGE_DIR_SIZE	16
+
+/* Voltage processor register offsets */
+struct vp_reg_offs {
+	u8 vpconfig;
+	u8 vstepmin;
+	u8 vstepmax;
+	u8 vlimitto;
+	u8 vstatus;
+	u8 voltage;
+};
+
+/* Voltage Processor bit field values, shifts and masks */
+struct vp_reg_val {
+	/* PRM module */
+	u16 prm_mod;
+	/* VPx_VPCONFIG */
+	u32 vpconfig_erroroffset;
+	u16 vpconfig_errorgain;
+	u32 vpconfig_errorgain_mask;
+	u8 vpconfig_errorgain_shift;
+	u32 vpconfig_initvoltage_mask;
+	u8 vpconfig_initvoltage_shift;
+	u32 vpconfig_timeouten;
+	u32 vpconfig_initvdd;
+	u32 vpconfig_forceupdate;
+	u32 vpconfig_vpenable;
+	/* VPx_VSTEPMIN */
+	u8 vstepmin_stepmin;
+	u16 vstepmin_smpswaittimemin;
+	u8 vstepmin_stepmin_shift;
+	u8 vstepmin_smpswaittimemin_shift;
+	/* VPx_VSTEPMAX */
+	u8 vstepmax_stepmax;
+	u16 vstepmax_smpswaittimemax;
+	u8 vstepmax_stepmax_shift;
+	u8 vstepmax_smpswaittimemax_shift;
+	/* VPx_VLIMITTO */
+	u8 vlimitto_vddmin;
+	u8 vlimitto_vddmax;
+	u16 vlimitto_timeout;
+	u8 vlimitto_vddmin_shift;
+	u8 vlimitto_vddmax_shift;
+	u8 vlimitto_timeout_shift;
+	/* PRM_IRQSTATUS*/
+	u32 tranxdone_status;
+};
+
+/* Voltage controller registers and offsets */
+struct vc_reg_info {
+	/* PRM module */
+	u16 prm_mod;
+	/* VC register offsets */
+	u8 smps_sa_reg;
+	u8 smps_volra_reg;
+	u8 bypass_val_reg;
+	u8 cmdval_reg;
+	u8 voltsetup_reg;
+	/*VC_SMPS_SA*/
+	u8 smps_sa_shift;
+	u32 smps_sa_mask;
+	/* VC_SMPS_VOL_RA */
+	u8 smps_volra_shift;
+	u32 smps_volra_mask;
+	/* VC_BYPASS_VAL */
+	u8 data_shift;
+	u8 slaveaddr_shift;
+	u8 regaddr_shift;
+	u32 valid;
+	/* VC_CMD_VAL */
+	u8 cmd_on_shift;
+	u8 cmd_onlp_shift;
+	u8 cmd_ret_shift;
+	u8 cmd_off_shift;
+	u32 cmd_on_mask;
+	/* PRM_VOLTSETUP */
+	u8 voltsetup_shift;
+	u32 voltsetup_mask;
+};
+
+/**
+ * omap_vdd_info - Per Voltage Domain info
+ *
+ * @volt_data		: voltage table having the distinct voltages supported
+ *			  by the domain and other associated per voltage data.
+ * @pmic_info		: pmic specific parameters which should be populted by
+ *			  the pmic drivers.
+ * @vp_offs		: structure containing the offsets for various
+ *			  vp registers
+ * @vp_reg		: the register values, shifts, masks for various
+ *			  vp registers
+ * @vc_reg		: structure containing various various vc registers,
+ *			  shifts, masks etc.
+ * @voltdm		: pointer to the voltage domain structure
+ * @debug_dir		: debug directory for this voltage domain.
+ * @curr_volt		: current voltage for this vdd.
+ * @ocp_mod		: The prm module for accessing the prm irqstatus reg.
+ * @prm_irqst_reg	: prm irqstatus register.
+ * @vp_enabled		: flag to keep track of whether vp is enabled or not
+ * @volt_scale		: API to scale the voltage of the vdd.
+ */
+struct omap_vdd_info {
+	struct omap_volt_data *volt_data;
+	struct omap_volt_pmic_info *pmic_info;
+	struct vp_reg_offs vp_offs;
+	struct vp_reg_val vp_reg;
+	struct vc_reg_info vc_reg;
+	struct voltagedomain voltdm;
+	struct dentry *debug_dir;
+	u32 curr_volt;
+	u16 ocp_mod;
+	u8 prm_irqst_reg;
+	bool vp_enabled;
+	u32 (*read_reg) (u16 mod, u8 offset);
+	void (*write_reg) (u32 val, u16 mod, u8 offset);
+	int (*volt_scale) (struct omap_vdd_info *vdd,
+		unsigned long target_volt);
+};
+
+static struct omap_vdd_info *vdd_info;
+/*
+ * Number of scalable voltage domains.
+ */
+static int nr_scalable_vdd;
+
+/* OMAP3 VDD sturctures */
+static struct omap_vdd_info omap3_vdd_info[] = {
+	{
+		.vp_offs = {
+			.vpconfig = OMAP3_PRM_VP1_CONFIG_OFFSET,
+			.vstepmin = OMAP3_PRM_VP1_VSTEPMIN_OFFSET,
+			.vstepmax = OMAP3_PRM_VP1_VSTEPMAX_OFFSET,
+			.vlimitto = OMAP3_PRM_VP1_VLIMITTO_OFFSET,
+			.vstatus = OMAP3_PRM_VP1_STATUS_OFFSET,
+			.voltage = OMAP3_PRM_VP1_VOLTAGE_OFFSET,
+		},
+		.voltdm = {
+			.name = "mpu",
+		},
+	},
+	{
+		.vp_offs = {
+			.vpconfig = OMAP3_PRM_VP2_CONFIG_OFFSET,
+			.vstepmin = OMAP3_PRM_VP2_VSTEPMIN_OFFSET,
+			.vstepmax = OMAP3_PRM_VP2_VSTEPMAX_OFFSET,
+			.vlimitto = OMAP3_PRM_VP2_VLIMITTO_OFFSET,
+			.vstatus = OMAP3_PRM_VP2_STATUS_OFFSET,
+			.voltage = OMAP3_PRM_VP2_VOLTAGE_OFFSET,
+		},
+		.voltdm = {
+			.name = "core",
+		},
+	},
+};
+
+#define OMAP3_NR_SCALABLE_VDD ARRAY_SIZE(omap3_vdd_info)
+
+/*
+ * Structures containing OMAP3430/OMAP3630 voltage supported and various
+ * voltage dependent data for each VDD.
+ */
+#define VOLT_DATA_DEFINE(_v_nom, _efuse_offs, _errminlimit, _errgain)	\
+{									\
+	.volt_nominal	= _v_nom,					\
+	.sr_efuse_offs	= _efuse_offs,					\
+	.sr_errminlimit	= _errminlimit,					\
+	.vp_errgain	= _errgain					\
+}
+
+/* VDD1 */
+static struct omap_volt_data omap34xx_vddmpu_volt_data[] = {
+	VOLT_DATA_DEFINE(OMAP3430_VDD_MPU_OPP1_UV, OMAP343X_CONTROL_FUSE_OPP1_VDD1, 0xf4, 0x0c),
+	VOLT_DATA_DEFINE(OMAP3430_VDD_MPU_OPP2_UV, OMAP343X_CONTROL_FUSE_OPP2_VDD1, 0xf4, 0x0c),
+	VOLT_DATA_DEFINE(OMAP3430_VDD_MPU_OPP3_UV, OMAP343X_CONTROL_FUSE_OPP3_VDD1, 0xf9, 0x18),
+	VOLT_DATA_DEFINE(OMAP3430_VDD_MPU_OPP4_UV, OMAP343X_CONTROL_FUSE_OPP4_VDD1, 0xf9, 0x18),
+	VOLT_DATA_DEFINE(OMAP3430_VDD_MPU_OPP5_UV, OMAP343X_CONTROL_FUSE_OPP5_VDD1, 0xf9, 0x18),
+	VOLT_DATA_DEFINE(0, 0, 0, 0),
+};
+
+static struct omap_volt_data omap36xx_vddmpu_volt_data[] = {
+	VOLT_DATA_DEFINE(OMAP3630_VDD_MPU_OPP50_UV, OMAP3630_CONTROL_FUSE_OPP50_VDD1, 0xf4, 0x0c),
+	VOLT_DATA_DEFINE(OMAP3630_VDD_MPU_OPP100_UV, OMAP3630_CONTROL_FUSE_OPP100_VDD1, 0xf9, 0x16),
+	VOLT_DATA_DEFINE(OMAP3630_VDD_MPU_OPP120_UV, OMAP3630_CONTROL_FUSE_OPP120_VDD1, 0xfa, 0x23),
+	VOLT_DATA_DEFINE(OMAP3630_VDD_MPU_OPP1G_UV, OMAP3630_CONTROL_FUSE_OPP1G_VDD1, 0xfa, 0x27),
+	VOLT_DATA_DEFINE(0, 0, 0, 0),
+};
+
+/* VDD2 */
+static struct omap_volt_data omap34xx_vddcore_volt_data[] = {
+	VOLT_DATA_DEFINE(OMAP3430_VDD_CORE_OPP1_UV, OMAP343X_CONTROL_FUSE_OPP1_VDD2, 0xf4, 0x0c),
+	VOLT_DATA_DEFINE(OMAP3430_VDD_CORE_OPP2_UV, OMAP343X_CONTROL_FUSE_OPP2_VDD2, 0xf4, 0x0c),
+	VOLT_DATA_DEFINE(OMAP3430_VDD_CORE_OPP3_UV, OMAP343X_CONTROL_FUSE_OPP3_VDD2, 0xf9, 0x18),
+	VOLT_DATA_DEFINE(0, 0, 0, 0),
+};
+
+static struct omap_volt_data omap36xx_vddcore_volt_data[] = {
+	VOLT_DATA_DEFINE(OMAP3630_VDD_CORE_OPP50_UV, OMAP3630_CONTROL_FUSE_OPP50_VDD2, 0xf4, 0x0c),
+	VOLT_DATA_DEFINE(OMAP3630_VDD_CORE_OPP100_UV, OMAP3630_CONTROL_FUSE_OPP100_VDD2, 0xf9, 0x16),
+	VOLT_DATA_DEFINE(0, 0, 0, 0),
+};
+
+static struct dentry *voltage_dir;
+
+/* Init function pointers */
+static void (*vc_init) (struct omap_vdd_info *vdd);
+static int (*vdd_data_configure) (struct omap_vdd_info *vdd);
+
+static u32 omap3_voltage_read_reg(u16 mod, u8 offset)
+{
+	return omap2_prm_read_mod_reg(mod, offset);
+}
+
+static void omap3_voltage_write_reg(u32 val, u16 mod, u8 offset)
+{
+	omap2_prm_write_mod_reg(val, mod, offset);
+}
+
+static void vp_latch_vsel(struct omap_vdd_info *vdd)
+{
+	u32 vpconfig;
+	u16 mod;
+	unsigned long uvdc;
+	char vsel;
+
+	uvdc = omap_voltage_get_nom_volt(&vdd->voltdm);
+	if (!uvdc) {
+		pr_warning("%s: unable to find current voltage for vdd_%s\n",
+			__func__, vdd->voltdm.name);
+		return;
+	}
+
+	if (!vdd->pmic_info || !vdd->pmic_info->uv_to_vsel) {
+		pr_warning("%s: PMIC function to convert voltage in uV to"
+			" vsel not registered\n", __func__);
+		return;
+	}
+
+	mod = vdd->vp_reg.prm_mod;
+
+	vsel = vdd->pmic_info->uv_to_vsel(uvdc);
+
+	vpconfig = vdd->read_reg(mod, vdd->vp_offs.vpconfig);
+	vpconfig &= ~(vdd->vp_reg.vpconfig_initvoltage_mask |
+			vdd->vp_reg.vpconfig_initvdd);
+	vpconfig |= vsel << vdd->vp_reg.vpconfig_initvoltage_shift;
+
+	vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig);
+
+	/* Trigger initVDD value copy to voltage processor */
+	vdd->write_reg((vpconfig | vdd->vp_reg.vpconfig_initvdd), mod,
+			vdd->vp_offs.vpconfig);
+
+	/* Clear initVDD copy trigger bit */
+	vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig);
+}
+
+/* Generic voltage init functions */
+static void __init vp_init(struct omap_vdd_info *vdd)
+{
+	u32 vp_val;
+	u16 mod;
+
+	if (!vdd->read_reg || !vdd->write_reg) {
+		pr_err("%s: No read/write API for accessing vdd_%s regs\n",
+			__func__, vdd->voltdm.name);
+		return;
+	}
+
+	mod = vdd->vp_reg.prm_mod;
+
+	vp_val = vdd->vp_reg.vpconfig_erroroffset |
+		(vdd->vp_reg.vpconfig_errorgain <<
+		vdd->vp_reg.vpconfig_errorgain_shift) |
+		vdd->vp_reg.vpconfig_timeouten;
+	vdd->write_reg(vp_val, mod, vdd->vp_offs.vpconfig);
+
+	vp_val = ((vdd->vp_reg.vstepmin_smpswaittimemin <<
+		vdd->vp_reg.vstepmin_smpswaittimemin_shift) |
+		(vdd->vp_reg.vstepmin_stepmin <<
+		vdd->vp_reg.vstepmin_stepmin_shift));
+	vdd->write_reg(vp_val, mod, vdd->vp_offs.vstepmin);
+
+	vp_val = ((vdd->vp_reg.vstepmax_smpswaittimemax <<
+		vdd->vp_reg.vstepmax_smpswaittimemax_shift) |
+		(vdd->vp_reg.vstepmax_stepmax <<
+		vdd->vp_reg.vstepmax_stepmax_shift));
+	vdd->write_reg(vp_val, mod, vdd->vp_offs.vstepmax);
+
+	vp_val = ((vdd->vp_reg.vlimitto_vddmax <<
+		vdd->vp_reg.vlimitto_vddmax_shift) |
+		(vdd->vp_reg.vlimitto_vddmin <<
+		vdd->vp_reg.vlimitto_vddmin_shift) |
+		(vdd->vp_reg.vlimitto_timeout <<
+		vdd->vp_reg.vlimitto_timeout_shift));
+	vdd->write_reg(vp_val, mod, vdd->vp_offs.vlimitto);
+}
+
+static void __init vdd_debugfs_init(struct omap_vdd_info *vdd)
+{
+	char *name;
+
+	name = kzalloc(VOLTAGE_DIR_SIZE, GFP_KERNEL);
+	if (!name) {
+		pr_warning("%s: Unable to allocate memory for debugfs"
+			" directory name for vdd_%s",
+			__func__, vdd->voltdm.name);
+		return;
+	}
+	strcpy(name, "vdd_");
+	strcat(name, vdd->voltdm.name);
+
+	vdd->debug_dir = debugfs_create_dir(name, voltage_dir);
+	if (IS_ERR(vdd->debug_dir)) {
+		pr_warning("%s: Unable to create debugfs directory for"
+			" vdd_%s\n", __func__, vdd->voltdm.name);
+		vdd->debug_dir = NULL;
+	}
+}
+
+/* Voltage scale and accessory APIs */
+static int _pre_volt_scale(struct omap_vdd_info *vdd,
+		unsigned long target_volt, u8 *target_vsel, u8 *current_vsel)
+{
+	struct omap_volt_data *volt_data;
+	u32 vc_cmdval, vp_errgain_val;
+	u16 vp_mod, vc_mod;
+
+	/* Check if suffiecient pmic info is available for this vdd */
+	if (!vdd->pmic_info) {
+		pr_err("%s: Insufficient pmic info to scale the vdd_%s\n",
+			__func__, vdd->voltdm.name);
+		return -EINVAL;
+	}
+
+	if (!vdd->pmic_info->uv_to_vsel) {
+		pr_err("%s: PMIC function to convert voltage in uV to"
+			"vsel not registered. Hence unable to scale voltage"
+			"for vdd_%s\n", __func__, vdd->voltdm.name);
+		return -ENODATA;
+	}
+
+	if (!vdd->read_reg || !vdd->write_reg) {
+		pr_err("%s: No read/write API for accessing vdd_%s regs\n",
+			__func__, vdd->voltdm.name);
+		return -EINVAL;
+	}
+
+	vp_mod = vdd->vp_reg.prm_mod;
+	vc_mod = vdd->vc_reg.prm_mod;
+
+	/* Get volt_data corresponding to target_volt */
+	volt_data = omap_voltage_get_voltdata(&vdd->voltdm, target_volt);
+	if (IS_ERR(volt_data))
+		volt_data = NULL;
+
+	*target_vsel = vdd->pmic_info->uv_to_vsel(target_volt);
+	*current_vsel = vdd->read_reg(vp_mod, vdd->vp_offs.voltage);
+
+	/* Setting the ON voltage to the new target voltage */
+	vc_cmdval = vdd->read_reg(vc_mod, vdd->vc_reg.cmdval_reg);
+	vc_cmdval &= ~vdd->vc_reg.cmd_on_mask;
+	vc_cmdval |= (*target_vsel << vdd->vc_reg.cmd_on_shift);
+	vdd->write_reg(vc_cmdval, vc_mod, vdd->vc_reg.cmdval_reg);
+
+	/* Setting vp errorgain based on the voltage */
+	if (volt_data) {
+		vp_errgain_val = vdd->read_reg(vp_mod,
+				vdd->vp_offs.vpconfig);
+		vdd->vp_reg.vpconfig_errorgain = volt_data->vp_errgain;
+		vp_errgain_val &= ~vdd->vp_reg.vpconfig_errorgain_mask;
+		vp_errgain_val |= vdd->vp_reg.vpconfig_errorgain <<
+				vdd->vp_reg.vpconfig_errorgain_shift;
+		vdd->write_reg(vp_errgain_val, vp_mod,
+				vdd->vp_offs.vpconfig);
+	}
+
+	return 0;
+}
+
+static void _post_volt_scale(struct omap_vdd_info *vdd,
+		unsigned long target_volt, u8 target_vsel, u8 current_vsel)
+{
+	u32 smps_steps = 0, smps_delay = 0;
+
+	smps_steps = abs(target_vsel - current_vsel);
+	/* SMPS slew rate / step size. 2us added as buffer. */
+	smps_delay = ((smps_steps * vdd->pmic_info->step_size) /
+			vdd->pmic_info->slew_rate) + 2;
+	udelay(smps_delay);
+
+	vdd->curr_volt = target_volt;
+}
+
+/* vc_bypass_scale_voltage - VC bypass method of voltage scaling */
+static int vc_bypass_scale_voltage(struct omap_vdd_info *vdd,
+		unsigned long target_volt)
+{
+	u32 loop_cnt = 0, retries_cnt = 0;
+	u32 vc_valid, vc_bypass_val_reg, vc_bypass_value;
+	u16 mod;
+	u8 target_vsel, current_vsel;
+	int ret;
+
+	ret = _pre_volt_scale(vdd, target_volt, &target_vsel, &current_vsel);
+	if (ret)
+		return ret;
+
+	mod = vdd->vc_reg.prm_mod;
+
+	vc_valid = vdd->vc_reg.valid;
+	vc_bypass_val_reg = vdd->vc_reg.bypass_val_reg;
+	vc_bypass_value = (target_vsel << vdd->vc_reg.data_shift) |
+			(vdd->pmic_info->pmic_reg <<
+			vdd->vc_reg.regaddr_shift) |
+			(vdd->pmic_info->i2c_slave_addr <<
+			vdd->vc_reg.slaveaddr_shift);
+
+	vdd->write_reg(vc_bypass_value, mod, vc_bypass_val_reg);
+	vdd->write_reg(vc_bypass_value | vc_valid, mod, vc_bypass_val_reg);
+
+	vc_bypass_value = vdd->read_reg(mod, vc_bypass_val_reg);
+	/*
+	 * Loop till the bypass command is acknowledged from the SMPS.
+	 * NOTE: This is legacy code. The loop count and retry count needs
+	 * to be revisited.
+	 */
+	while (!(vc_bypass_value & vc_valid)) {
+		loop_cnt++;
+
+		if (retries_cnt > 10) {
+			pr_warning("%s: Retry count exceeded\n", __func__);
+			return -ETIMEDOUT;
+		}
+
+		if (loop_cnt > 50) {
+			retries_cnt++;
+			loop_cnt = 0;
+			udelay(10);
+		}
+		vc_bypass_value = vdd->read_reg(mod, vc_bypass_val_reg);
+	}
+
+	_post_volt_scale(vdd, target_volt, target_vsel, current_vsel);
+	return 0;
+}
+
+/* VP force update method of voltage scaling */
+static int vp_forceupdate_scale_voltage(struct omap_vdd_info *vdd,
+		unsigned long target_volt)
+{
+	u32 vpconfig;
+	u16 mod, ocp_mod;
+	u8 target_vsel, current_vsel, prm_irqst_reg;
+	int ret, timeout = 0;
+
+	ret = _pre_volt_scale(vdd, target_volt, &target_vsel, &current_vsel);
+	if (ret)
+		return ret;
+
+	mod = vdd->vp_reg.prm_mod;
+	ocp_mod = vdd->ocp_mod;
+	prm_irqst_reg = vdd->prm_irqst_reg;
+
+	/*
+	 * Clear all pending TransactionDone interrupt/status. Typical latency
+	 * is <3us
+	 */
+	while (timeout++ < VP_TRANXDONE_TIMEOUT) {
+		vdd->write_reg(vdd->vp_reg.tranxdone_status,
+				ocp_mod, prm_irqst_reg);
+		if (!(vdd->read_reg(ocp_mod, prm_irqst_reg) &
+				vdd->vp_reg.tranxdone_status))
+				break;
+		udelay(1);
+	}
+	if (timeout >= VP_TRANXDONE_TIMEOUT) {
+		pr_warning("%s: vdd_%s TRANXDONE timeout exceeded."
+			"Voltage change aborted", __func__, vdd->voltdm.name);
+		return -ETIMEDOUT;
+	}
+
+	/* Configure for VP-Force Update */
+	vpconfig = vdd->read_reg(mod, vdd->vp_offs.vpconfig);
+	vpconfig &= ~(vdd->vp_reg.vpconfig_initvdd |
+			vdd->vp_reg.vpconfig_forceupdate |
+			vdd->vp_reg.vpconfig_initvoltage_mask);
+	vpconfig |= ((target_vsel <<
+			vdd->vp_reg.vpconfig_initvoltage_shift));
+	vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig);
+
+	/* Trigger initVDD value copy to voltage processor */
+	vpconfig |= vdd->vp_reg.vpconfig_initvdd;
+	vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig);
+
+	/* Force update of voltage */
+	vpconfig |= vdd->vp_reg.vpconfig_forceupdate;
+	vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig);
+
+	/*
+	 * Wait for TransactionDone. Typical latency is <200us.
+	 * Depends on SMPSWAITTIMEMIN/MAX and voltage change
+	 */
+	timeout = 0;
+	omap_test_timeout((vdd->read_reg(ocp_mod, prm_irqst_reg) &
+			vdd->vp_reg.tranxdone_status),
+			VP_TRANXDONE_TIMEOUT, timeout);
+	if (timeout >= VP_TRANXDONE_TIMEOUT)
+		pr_err("%s: vdd_%s TRANXDONE timeout exceeded."
+			"TRANXDONE never got set after the voltage update\n",
+			__func__, vdd->voltdm.name);
+
+	_post_volt_scale(vdd, target_volt, target_vsel, current_vsel);
+
+	/*
+	 * Disable TransactionDone interrupt , clear all status, clear
+	 * control registers
+	 */
+	timeout = 0;
+	while (timeout++ < VP_TRANXDONE_TIMEOUT) {
+		vdd->write_reg(vdd->vp_reg.tranxdone_status,
+				ocp_mod, prm_irqst_reg);
+		if (!(vdd->read_reg(ocp_mod, prm_irqst_reg) &
+				vdd->vp_reg.tranxdone_status))
+				break;
+		udelay(1);
+	}
+
+	if (timeout >= VP_TRANXDONE_TIMEOUT)
+		pr_warning("%s: vdd_%s TRANXDONE timeout exceeded while trying"
+			"to clear the TRANXDONE status\n",
+			__func__, vdd->voltdm.name);
+
+	vpconfig = vdd->read_reg(mod, vdd->vp_offs.vpconfig);
+	/* Clear initVDD copy trigger bit */
+	vpconfig &= ~vdd->vp_reg.vpconfig_initvdd;;
+	vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig);
+	/* Clear force bit */
+	vpconfig &= ~vdd->vp_reg.vpconfig_forceupdate;
+	vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig);
+
+	return 0;
+}
+
+/* OMAP3 specific voltage init functions */
+
+/*
+ * Intializes the voltage controller registers with the PMIC and board
+ * specific parameters and voltage setup times for OMAP3.
+ */
+static void __init omap3_vc_init(struct omap_vdd_info *vdd)
+{
+	u32 vc_val;
+	u16 mod;
+	u8 on_vsel, onlp_vsel, ret_vsel, off_vsel;
+	static bool is_initialized;
+
+	if (!vdd->pmic_info || !vdd->pmic_info->uv_to_vsel) {
+		pr_err("%s: PMIC info requried to configure vc for"
+			"vdd_%s not populated.Hence cannot initialize vc\n",
+			__func__, vdd->voltdm.name);
+		return;
+	}
+
+	if (!vdd->read_reg || !vdd->write_reg) {
+		pr_err("%s: No read/write API for accessing vdd_%s regs\n",
+			__func__, vdd->voltdm.name);
+		return;
+	}
+
+	mod = vdd->vc_reg.prm_mod;
+
+	/* Set up the SMPS_SA(i2c slave address in VC */
+	vc_val = vdd->read_reg(mod, vdd->vc_reg.smps_sa_reg);
+	vc_val &= ~vdd->vc_reg.smps_sa_mask;
+	vc_val |= vdd->pmic_info->i2c_slave_addr << vdd->vc_reg.smps_sa_shift;
+	vdd->write_reg(vc_val, mod, vdd->vc_reg.smps_sa_reg);
+
+	/* Setup the VOLRA(pmic reg addr) in VC */
+	vc_val = vdd->read_reg(mod, vdd->vc_reg.smps_volra_reg);
+	vc_val &= ~vdd->vc_reg.smps_volra_mask;
+	vc_val |= vdd->pmic_info->pmic_reg << vdd->vc_reg.smps_volra_shift;
+	vdd->write_reg(vc_val, mod, vdd->vc_reg.smps_volra_reg);
+
+	/*Configure the setup times */
+	vc_val = vdd->read_reg(mod, vdd->vc_reg.voltsetup_reg);
+	vc_val &= ~vdd->vc_reg.voltsetup_mask;
+	vc_val |= vdd->pmic_info->volt_setup_time <<
+			vdd->vc_reg.voltsetup_shift;
+	vdd->write_reg(vc_val, mod, vdd->vc_reg.voltsetup_reg);
+
+	/* Set up the on, inactive, retention and off voltage */
+	on_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->on_volt);
+	onlp_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->onlp_volt);
+	ret_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->ret_volt);
+	off_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->off_volt);
+	vc_val	= ((on_vsel << vdd->vc_reg.cmd_on_shift) |
+		(onlp_vsel << vdd->vc_reg.cmd_onlp_shift) |
+		(ret_vsel << vdd->vc_reg.cmd_ret_shift) |
+		(off_vsel << vdd->vc_reg.cmd_off_shift));
+	vdd->write_reg(vc_val, mod, vdd->vc_reg.cmdval_reg);
+
+	if (is_initialized)
+		return;
+
+	/* Generic VC parameters init */
+	vdd->write_reg(OMAP3430_CMD1_MASK | OMAP3430_RAV1_MASK, mod,
+			OMAP3_PRM_VC_CH_CONF_OFFSET);
+	vdd->write_reg(OMAP3430_MCODE_SHIFT | OMAP3430_HSEN_MASK, mod,
+			OMAP3_PRM_VC_I2C_CFG_OFFSET);
+	vdd->write_reg(OMAP3_CLKSETUP, mod, OMAP3_PRM_CLKSETUP_OFFSET);
+	vdd->write_reg(OMAP3_VOLTOFFSET, mod, OMAP3_PRM_VOLTOFFSET_OFFSET);
+	vdd->write_reg(OMAP3_VOLTSETUP2, mod, OMAP3_PRM_VOLTSETUP2_OFFSET);
+	is_initialized = true;
+}
+
+/* Sets up all the VDD related info for OMAP3 */
+static int __init omap3_vdd_data_configure(struct omap_vdd_info *vdd)
+{
+	struct clk *sys_ck;
+	u32 sys_clk_speed, timeout_val, waittime;
+
+	if (!vdd->pmic_info) {
+		pr_err("%s: PMIC info requried to configure vdd_%s not"
+			"populated.Hence cannot initialize vdd_%s\n",
+			__func__, vdd->voltdm.name, vdd->voltdm.name);
+		return -EINVAL;
+	}
+
+	if (!strcmp(vdd->voltdm.name, "mpu")) {
+		if (cpu_is_omap3630())
+			vdd->volt_data = omap36xx_vddmpu_volt_data;
+		else
+			vdd->volt_data = omap34xx_vddmpu_volt_data;
+
+		vdd->vp_reg.tranxdone_status = OMAP3430_VP1_TRANXDONE_ST_MASK;
+		vdd->vc_reg.cmdval_reg = OMAP3_PRM_VC_CMD_VAL_0_OFFSET;
+		vdd->vc_reg.smps_sa_shift = OMAP3430_PRM_VC_SMPS_SA_SA0_SHIFT;
+		vdd->vc_reg.smps_sa_mask = OMAP3430_PRM_VC_SMPS_SA_SA0_MASK;
+		vdd->vc_reg.smps_volra_shift = OMAP3430_VOLRA0_SHIFT;
+		vdd->vc_reg.smps_volra_mask = OMAP3430_VOLRA0_MASK;
+		vdd->vc_reg.voltsetup_shift = OMAP3430_SETUP_TIME1_SHIFT;
+		vdd->vc_reg.voltsetup_mask = OMAP3430_SETUP_TIME1_MASK;
+	} else if (!strcmp(vdd->voltdm.name, "core")) {
+		if (cpu_is_omap3630())
+			vdd->volt_data = omap36xx_vddcore_volt_data;
+		else
+			vdd->volt_data = omap34xx_vddcore_volt_data;
+
+		vdd->vp_reg.tranxdone_status = OMAP3430_VP2_TRANXDONE_ST_MASK;
+		vdd->vc_reg.cmdval_reg = OMAP3_PRM_VC_CMD_VAL_1_OFFSET;
+		vdd->vc_reg.smps_sa_shift = OMAP3430_PRM_VC_SMPS_SA_SA1_SHIFT;
+		vdd->vc_reg.smps_sa_mask = OMAP3430_PRM_VC_SMPS_SA_SA1_MASK;
+		vdd->vc_reg.smps_volra_shift = OMAP3430_VOLRA1_SHIFT;
+		vdd->vc_reg.smps_volra_mask = OMAP3430_VOLRA1_MASK;
+		vdd->vc_reg.voltsetup_shift = OMAP3430_SETUP_TIME2_SHIFT;
+		vdd->vc_reg.voltsetup_mask = OMAP3430_SETUP_TIME2_MASK;
+	} else {
+		pr_warning("%s: vdd_%s does not exisit in OMAP3\n",
+			__func__, vdd->voltdm.name);
+		return -EINVAL;
+	}
+
+	/*
+	 * Sys clk rate is require to calculate vp timeout value and
+	 * smpswaittimemin and smpswaittimemax.
+	 */
+	sys_ck = clk_get(NULL, "sys_ck");
+	if (IS_ERR(sys_ck)) {
+		pr_warning("%s: Could not get the sys clk to calculate"
+			"various vdd_%s params\n", __func__, vdd->voltdm.name);
+		return -EINVAL;
+	}
+	sys_clk_speed = clk_get_rate(sys_ck);
+	clk_put(sys_ck);
+	/* Divide to avoid overflow */
+	sys_clk_speed /= 1000;
+
+	/* Generic voltage parameters */
+	vdd->curr_volt = 1200000;
+	vdd->ocp_mod = OCP_MOD;
+	vdd->prm_irqst_reg = OMAP3_PRM_IRQSTATUS_MPU_OFFSET;
+	vdd->read_reg = omap3_voltage_read_reg;
+	vdd->write_reg = omap3_voltage_write_reg;
+	vdd->volt_scale = vp_forceupdate_scale_voltage;
+	vdd->vp_enabled = false;
+
+	/* VC parameters */
+	vdd->vc_reg.prm_mod = OMAP3430_GR_MOD;
+	vdd->vc_reg.smps_sa_reg = OMAP3_PRM_VC_SMPS_SA_OFFSET;
+	vdd->vc_reg.smps_volra_reg = OMAP3_PRM_VC_SMPS_VOL_RA_OFFSET;
+	vdd->vc_reg.bypass_val_reg = OMAP3_PRM_VC_BYPASS_VAL_OFFSET;
+	vdd->vc_reg.voltsetup_reg = OMAP3_PRM_VOLTSETUP1_OFFSET;
+	vdd->vc_reg.data_shift = OMAP3430_DATA_SHIFT;
+	vdd->vc_reg.slaveaddr_shift = OMAP3430_SLAVEADDR_SHIFT;
+	vdd->vc_reg.regaddr_shift = OMAP3430_REGADDR_SHIFT;
+	vdd->vc_reg.valid = OMAP3430_VALID_MASK;
+	vdd->vc_reg.cmd_on_shift = OMAP3430_VC_CMD_ON_SHIFT;
+	vdd->vc_reg.cmd_on_mask = OMAP3430_VC_CMD_ON_MASK;
+	vdd->vc_reg.cmd_onlp_shift = OMAP3430_VC_CMD_ONLP_SHIFT;
+	vdd->vc_reg.cmd_ret_shift = OMAP3430_VC_CMD_RET_SHIFT;
+	vdd->vc_reg.cmd_off_shift = OMAP3430_VC_CMD_OFF_SHIFT;
+
+	vdd->vp_reg.prm_mod = OMAP3430_GR_MOD;
+
+	/* VPCONFIG bit fields */
+	vdd->vp_reg.vpconfig_erroroffset = (vdd->pmic_info->vp_erroroffset <<
+				 OMAP3430_ERROROFFSET_SHIFT);
+	vdd->vp_reg.vpconfig_errorgain_mask = OMAP3430_ERRORGAIN_MASK;
+	vdd->vp_reg.vpconfig_errorgain_shift = OMAP3430_ERRORGAIN_SHIFT;
+	vdd->vp_reg.vpconfig_initvoltage_shift = OMAP3430_INITVOLTAGE_SHIFT;
+	vdd->vp_reg.vpconfig_initvoltage_mask = OMAP3430_INITVOLTAGE_MASK;
+	vdd->vp_reg.vpconfig_timeouten = OMAP3430_TIMEOUTEN_MASK;
+	vdd->vp_reg.vpconfig_initvdd = OMAP3430_INITVDD_MASK;
+	vdd->vp_reg.vpconfig_forceupdate = OMAP3430_FORCEUPDATE_MASK;
+	vdd->vp_reg.vpconfig_vpenable = OMAP3430_VPENABLE_MASK;
+
+	/* VSTEPMIN VSTEPMAX bit fields */
+	waittime = ((vdd->pmic_info->step_size / vdd->pmic_info->slew_rate) *
+				sys_clk_speed) / 1000;
+	vdd->vp_reg.vstepmin_smpswaittimemin = waittime;
+	vdd->vp_reg.vstepmax_smpswaittimemax = waittime;
+	vdd->vp_reg.vstepmin_stepmin = vdd->pmic_info->vp_vstepmin;
+	vdd->vp_reg.vstepmax_stepmax = vdd->pmic_info->vp_vstepmax;
+	vdd->vp_reg.vstepmin_smpswaittimemin_shift =
+				OMAP3430_SMPSWAITTIMEMIN_SHIFT;
+	vdd->vp_reg.vstepmax_smpswaittimemax_shift =
+				OMAP3430_SMPSWAITTIMEMAX_SHIFT;
+	vdd->vp_reg.vstepmin_stepmin_shift = OMAP3430_VSTEPMIN_SHIFT;
+	vdd->vp_reg.vstepmax_stepmax_shift = OMAP3430_VSTEPMAX_SHIFT;
+
+	/* VLIMITTO bit fields */
+	timeout_val = (sys_clk_speed * vdd->pmic_info->vp_timeout_us) / 1000;
+	vdd->vp_reg.vlimitto_timeout = timeout_val;
+	vdd->vp_reg.vlimitto_vddmin = vdd->pmic_info->vp_vddmin;
+	vdd->vp_reg.vlimitto_vddmax = vdd->pmic_info->vp_vddmax;
+	vdd->vp_reg.vlimitto_vddmin_shift = OMAP3430_VDDMIN_SHIFT;
+	vdd->vp_reg.vlimitto_vddmax_shift = OMAP3430_VDDMAX_SHIFT;
+	vdd->vp_reg.vlimitto_timeout_shift = OMAP3430_TIMEOUT_SHIFT;
+
+	return 0;
+}
+
+/* Public functions */
+/**
+ * omap_voltage_get_nom_volt() - Gets the current non-auto-compensated voltage
+ * @voltdm:	pointer to the VDD for which current voltage info is needed
+ *
+ * API to get the current non-auto-compensated voltage for a VDD.
+ * Returns 0 in case of error else returns the current voltage for the VDD.
+ */
+unsigned long omap_voltage_get_nom_volt(struct voltagedomain *voltdm)
+{
+	struct omap_vdd_info *vdd;
+
+	if (!voltdm || IS_ERR(voltdm)) {
+		pr_warning("%s: VDD specified does not exist!\n", __func__);
+		return 0;
+	}
+
+	vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
+
+	return vdd->curr_volt;
+}
+
+/**
+ * omap_vp_get_curr_volt() - API to get the current vp voltage.
+ * @voltdm:	pointer to the VDD.
+ *
+ * This API returns the current voltage for the specified voltage processor
+ */
+unsigned long omap_vp_get_curr_volt(struct voltagedomain *voltdm)
+{
+	struct omap_vdd_info *vdd;
+	u8 curr_vsel;
+
+	if (!voltdm || IS_ERR(voltdm)) {
+		pr_warning("%s: VDD specified does not exist!\n", __func__);
+		return 0;
+	}
+
+	vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
+	if (!vdd->read_reg) {
+		pr_err("%s: No read API for reading vdd_%s regs\n",
+			__func__, voltdm->name);
+		return 0;
+	}
+
+	curr_vsel = vdd->read_reg(vdd->vp_reg.prm_mod,
+			vdd->vp_offs.voltage);
+
+	if (!vdd->pmic_info || !vdd->pmic_info->vsel_to_uv) {
+		pr_warning("%s: PMIC function to convert vsel to voltage"
+			"in uV not registerd\n", __func__);
+		return 0;
+	}
+
+	return vdd->pmic_info->vsel_to_uv(curr_vsel);
+}
+
+/**
+ * omap_vp_enable() - API to enable a particular VP
+ * @voltdm:	pointer to the VDD whose VP is to be enabled.
+ *
+ * This API enables a particular voltage processor. Needed by the smartreflex
+ * class drivers.
+ */
+void omap_vp_enable(struct voltagedomain *voltdm)
+{
+	struct omap_vdd_info *vdd;
+	u32 vpconfig;
+	u16 mod;
+
+	if (!voltdm || IS_ERR(voltdm)) {
+		pr_warning("%s: VDD specified does not exist!\n", __func__);
+		return;
+	}
+
+	vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
+	if (!vdd->read_reg || !vdd->write_reg) {
+		pr_err("%s: No read/write API for accessing vdd_%s regs\n",
+			__func__, voltdm->name);
+		return;
+	}
+
+	mod = vdd->vp_reg.prm_mod;
+
+	/* If VP is already enabled, do nothing. Return */
+	if (vdd->vp_enabled)
+		return;
+
+	vp_latch_vsel(vdd);
+
+	/* Enable VP */
+	vpconfig = vdd->read_reg(mod, vdd->vp_offs.vpconfig);
+	vpconfig |= vdd->vp_reg.vpconfig_vpenable;
+	vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig);
+	vdd->vp_enabled = true;
+}
+
+/**
+ * omap_vp_disable() - API to disable a particular VP
+ * @voltdm:	pointer to the VDD whose VP is to be disabled.
+ *
+ * This API disables a particular voltage processor. Needed by the smartreflex
+ * class drivers.
+ */
+void omap_vp_disable(struct voltagedomain *voltdm)
+{
+	struct omap_vdd_info *vdd;
+	u32 vpconfig;
+	u16 mod;
+	int timeout;
+
+	if (!voltdm || IS_ERR(voltdm)) {
+		pr_warning("%s: VDD specified does not exist!\n", __func__);
+		return;
+	}
+
+	vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
+	if (!vdd->read_reg || !vdd->write_reg) {
+		pr_err("%s: No read/write API for accessing vdd_%s regs\n",
+			__func__, voltdm->name);
+		return;
+	}
+
+	mod = vdd->vp_reg.prm_mod;
+
+	/* If VP is already disabled, do nothing. Return */
+	if (!vdd->vp_enabled) {
+		pr_warning("%s: Trying to disable VP for vdd_%s when"
+			"it is already disabled\n", __func__, voltdm->name);
+		return;
+	}
+
+	/* Disable VP */
+	vpconfig = vdd->read_reg(mod, vdd->vp_offs.vpconfig);
+	vpconfig &= ~vdd->vp_reg.vpconfig_vpenable;
+	vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig);
+
+	/*
+	 * Wait for VP idle Typical latency is <2us. Maximum latency is ~100us
+	 */
+	omap_test_timeout((vdd->read_reg(mod, vdd->vp_offs.vstatus)),
+				VP_IDLE_TIMEOUT, timeout);
+
+	if (timeout >= VP_IDLE_TIMEOUT)
+		pr_warning("%s: vdd_%s idle timedout\n",
+			__func__, voltdm->name);
+
+	vdd->vp_enabled = false;
+
+	return;
+}
+
+/**
+ * omap_voltage_scale_vdd() - API to scale voltage of a particular
+ *				voltage domain.
+ * @voltdm:	pointer to the VDD which is to be scaled.
+ * @target_volt:	The target voltage of the voltage domain
+ *
+ * This API should be called by the kernel to do the voltage scaling
+ * for a particular voltage domain during dvfs or any other situation.
+ */
+int omap_voltage_scale_vdd(struct voltagedomain *voltdm,
+		unsigned long target_volt)
+{
+	struct omap_vdd_info *vdd;
+
+	if (!voltdm || IS_ERR(voltdm)) {
+		pr_warning("%s: VDD specified does not exist!\n", __func__);
+		return -EINVAL;
+	}
+
+	vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
+
+	if (!vdd->volt_scale) {
+		pr_err("%s: No voltage scale API registered for vdd_%s\n",
+			__func__, voltdm->name);
+		return -ENODATA;
+	}
+
+	return vdd->volt_scale(vdd, target_volt);
+}
+
+/**
+ * omap_voltage_reset() - Resets the voltage of a particular voltage domain
+ *			to that of the current OPP.
+ * @voltdm:	pointer to the VDD whose voltage is to be reset.
+ *
+ * This API finds out the correct voltage the voltage domain is supposed
+ * to be at and resets the voltage to that level. Should be used expecially
+ * while disabling any voltage compensation modules.
+ */
+void omap_voltage_reset(struct voltagedomain *voltdm)
+{
+	unsigned long target_uvdc;
+
+	if (!voltdm || IS_ERR(voltdm)) {
+		pr_warning("%s: VDD specified does not exist!\n", __func__);
+		return;
+	}
+
+	target_uvdc = omap_voltage_get_nom_volt(voltdm);
+	if (!target_uvdc) {
+		pr_err("%s: unable to find current voltage for vdd_%s\n",
+			__func__, voltdm->name);
+		return;
+	}
+
+	omap_voltage_scale_vdd(voltdm, target_uvdc);
+}
+
+/**
+ * omap_voltage_get_volttable() - API to get the voltage table associated with a
+ *				particular voltage domain.
+ * @voltdm:	pointer to the VDD for which the voltage table is required
+ * @volt_data:	the voltage table for the particular vdd which is to be
+ *		populated by this API
+ *
+ * This API populates the voltage table associated with a VDD into the
+ * passed parameter pointer. Returns the count of distinct voltages
+ * supported by this vdd.
+ *
+ */
+void omap_voltage_get_volttable(struct voltagedomain *voltdm,
+		struct omap_volt_data **volt_data)
+{
+	struct omap_vdd_info *vdd;
+
+	if (!voltdm || IS_ERR(voltdm)) {
+		pr_warning("%s: VDD specified does not exist!\n", __func__);
+		return;
+	}
+
+	vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
+
+	*volt_data = vdd->volt_data;
+}
+
+/**
+ * omap_voltage_get_voltdata() - API to get the voltage table entry for a
+ *				particular voltage
+ * @voltdm:	pointer to the VDD whose voltage table has to be searched
+ * @volt:	the voltage to be searched in the voltage table
+ *
+ * This API searches through the voltage table for the required voltage
+ * domain and tries to find a matching entry for the passed voltage volt.
+ * If a matching entry is found volt_data is populated with that entry.
+ * This API searches only through the non-compensated voltages int the
+ * voltage table.
+ * Returns pointer to the voltage table entry corresponding to volt on
+ * sucess. Returns -ENODATA if no voltage table exisits for the passed voltage
+ * domain or if there is no matching entry.
+ */
+struct omap_volt_data *omap_voltage_get_voltdata(struct voltagedomain *voltdm,
+		unsigned long volt)
+{
+	struct omap_vdd_info *vdd;
+	int i;
+
+	if (!voltdm || IS_ERR(voltdm)) {
+		pr_warning("%s: VDD specified does not exist!\n", __func__);
+		return ERR_PTR(-EINVAL);
+	}
+
+	vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
+
+	if (!vdd->volt_data) {
+		pr_warning("%s: voltage table does not exist for vdd_%s\n",
+			__func__, voltdm->name);
+		return ERR_PTR(-ENODATA);
+	}
+
+	for (i = 0; vdd->volt_data[i].volt_nominal != 0; i++) {
+		if (vdd->volt_data[i].volt_nominal == volt)
+			return &vdd->volt_data[i];
+	}
+
+	pr_notice("%s: Unable to match the current voltage with the voltage"
+		"table for vdd_%s\n", __func__, voltdm->name);
+
+	return ERR_PTR(-ENODATA);
+}
+
+/**
+ * omap_voltage_register_pmic() - API to register PMIC specific data
+ * @voltdm:	pointer to the VDD for which the PMIC specific data is
+ *		to be registered
+ * @pmic_info:	the structure containing pmic info
+ *
+ * This API is to be called by the SOC/PMIC file to specify the
+ * pmic specific info as present in omap_volt_pmic_info structure.
+ */
+int omap_voltage_register_pmic(struct voltagedomain *voltdm,
+		struct omap_volt_pmic_info *pmic_info)
+{
+	struct omap_vdd_info *vdd;
+
+	if (!voltdm || IS_ERR(voltdm)) {
+		pr_warning("%s: VDD specified does not exist!\n", __func__);
+		return -EINVAL;
+	}
+
+	vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
+
+	vdd->pmic_info = pmic_info;
+
+	return 0;
+}
+
+/**
+ * omap_voltage_get_dbgdir() - API to get pointer to the debugfs directory
+ *				corresponding to a voltage domain.
+ *
+ * @voltdm:	pointer to the VDD whose debug directory is required.
+ *
+ * This API returns pointer to the debugfs directory corresponding
+ * to the voltage domain. Should be used by drivers requiring to
+ * add any debug entry for a particular voltage domain. Returns NULL
+ * in case of error.
+ */
+struct dentry *omap_voltage_get_dbgdir(struct voltagedomain *voltdm)
+{
+	struct omap_vdd_info *vdd;
+
+	if (!voltdm || IS_ERR(voltdm)) {
+		pr_warning("%s: VDD specified does not exist!\n", __func__);
+		return NULL;
+	}
+
+	vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
+
+	return vdd->debug_dir;
+}
+
+/**
+ * omap_change_voltscale_method() - API to change the voltage scaling method.
+ * @voltdm:	pointer to the VDD whose voltage scaling method
+ *		has to be changed.
+ * @voltscale_method:	the method to be used for voltage scaling.
+ *
+ * This API can be used by the board files to change the method of voltage
+ * scaling between vpforceupdate and vcbypass. The parameter values are
+ * defined in voltage.h
+ */
+void omap_change_voltscale_method(struct voltagedomain *voltdm,
+		int voltscale_method)
+{
+	struct omap_vdd_info *vdd;
+
+	if (!voltdm || IS_ERR(voltdm)) {
+		pr_warning("%s: VDD specified does not exist!\n", __func__);
+		return;
+	}
+
+	vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
+
+	switch (voltscale_method) {
+	case VOLTSCALE_VPFORCEUPDATE:
+		vdd->volt_scale = vp_forceupdate_scale_voltage;
+		return;
+	case VOLTSCALE_VCBYPASS:
+		vdd->volt_scale = vc_bypass_scale_voltage;
+		return;
+	default:
+		pr_warning("%s: Trying to change the method of voltage scaling"
+			"to an unsupported one!\n", __func__);
+	}
+}
+
+/**
+ * omap_voltage_domain_lookup() - API to get the voltage domain pointer
+ * @name:	Name of the voltage domain
+ *
+ * This API looks up in the global vdd_info struct for the
+ * existence of voltage domain <name>. If it exists, the API returns
+ * a pointer to the voltage domain structure corresponding to the
+ * VDD<name>. Else retuns error pointer.
+ */
+struct voltagedomain *omap_voltage_domain_lookup(char *name)
+{
+	int i;
+
+	if (!vdd_info) {
+		pr_err("%s: Voltage driver init not yet happened.Faulting!\n",
+			__func__);
+		return ERR_PTR(-EINVAL);
+	}
+
+	if (!name) {
+		pr_err("%s: No name to get the votage domain!\n", __func__);
+		return ERR_PTR(-EINVAL);
+	}
+
+	for (i = 0; i < nr_scalable_vdd; i++) {
+		if (!(strcmp(name, vdd_info[i].voltdm.name)))
+			return &vdd_info[i].voltdm;
+	}
+
+	return ERR_PTR(-EINVAL);
+}
+
+/**
+ * omap_voltage_late_init() - Init the various voltage parameters
+ *
+ * This API is to be called in the later stages of the
+ * system boot to init the voltage controller and
+ * voltage processors.
+ */
+int __init omap_voltage_late_init(void)
+{
+	int i;
+
+	if (!vdd_info) {
+		pr_err("%s: Voltage driver support not added\n",
+			__func__);
+		return -EINVAL;
+	}
+
+	voltage_dir = debugfs_create_dir("voltage", NULL);
+	if (IS_ERR(voltage_dir))
+		pr_err("%s: Unable to create voltage debugfs main dir\n",
+			__func__);
+	for (i = 0; i < nr_scalable_vdd; i++) {
+		if (vdd_data_configure(&vdd_info[i]))
+			continue;
+		vc_init(&vdd_info[i]);
+		vp_init(&vdd_info[i]);
+		vdd_debugfs_init(&vdd_info[i]);
+	}
+
+	return 0;
+}
+
+/**
+ * omap_voltage_early_init()- Volatage driver early init
+ */
+static int __init omap_voltage_early_init(void)
+{
+	if (cpu_is_omap34xx()) {
+		vdd_info = omap3_vdd_info;
+		nr_scalable_vdd = OMAP3_NR_SCALABLE_VDD;
+		vc_init = omap3_vc_init;
+		vdd_data_configure = omap3_vdd_data_configure;
+	} else {
+		pr_warning("%s: voltage driver support not added\n", __func__);
+	}
+
+	return 0;
+}
+core_initcall(omap_voltage_early_init);