diff --git a/arch/arm/mach-u300/Makefile b/arch/arm/mach-u300/Makefile
index 885b5c0..fab46fe 100644
--- a/arch/arm/mach-u300/Makefile
+++ b/arch/arm/mach-u300/Makefile
@@ -12,3 +12,4 @@
 obj-$(CONFIG_SPI_PL022)           += spi.o
 obj-$(CONFIG_MACH_U300_SPIDUMMY)  += dummyspichip.o
 obj-$(CONFIG_I2C_STU300)          += i2c.o
+obj-$(CONFIG_REGULATOR_AB3100)    += regulator.o
diff --git a/arch/arm/mach-u300/i2c.c b/arch/arm/mach-u300/i2c.c
index 10be1f8..7bc2503 100644
--- a/arch/arm/mach-u300/i2c.c
+++ b/arch/arm/mach-u300/i2c.c
@@ -9,13 +9,256 @@
  */
 #include <linux/kernel.h>
 #include <linux/i2c.h>
+#include <linux/mfd/ab3100.h>
+#include <linux/regulator/machine.h>
+#include <linux/amba/bus.h>
 #include <mach/irqs.h>
 
+/*
+ * Initial settings of ab3100 registers.
+ * Common for below LDO regulator settings are that
+ * bit 7-5 controls voltage. Bit 4 turns regulator ON(1) or OFF(0).
+ * Bit 3-2 controls sleep enable and bit 1-0 controls sleep mode.
+ */
+
+/* LDO_A 0x16: 2.75V, ON, SLEEP_A, SLEEP OFF GND */
+#define LDO_A_SETTING		0x16
+/* LDO_C 0x10: 2.65V, ON, SLEEP_A or B, SLEEP full power */
+#define LDO_C_SETTING		0x10
+/* LDO_D 0x10: 2.65V, ON, sleep mode not used */
+#define LDO_D_SETTING		0x10
+/* LDO_E 0x10: 1.8V, ON, SLEEP_A or B, SLEEP full power */
+#define LDO_E_SETTING		0x10
+/* LDO_E SLEEP 0x00: 1.8V, not used, SLEEP_A or B, not used */
+#define LDO_E_SLEEP_SETTING	0x00
+/* LDO_F 0xD0: 2.5V, ON, SLEEP_A or B, SLEEP full power */
+#define LDO_F_SETTING		0xD0
+/* LDO_G 0x00: 2.85V, OFF, SLEEP_A or B, SLEEP full power */
+#define LDO_G_SETTING		0x00
+/* LDO_H 0x18: 2.75V, ON, SLEEP_B, SLEEP full power */
+#define LDO_H_SETTING		0x18
+/* LDO_K 0x00: 2.75V, OFF, SLEEP_A or B, SLEEP full power */
+#define LDO_K_SETTING		0x00
+/* LDO_EXT 0x00: Voltage not set, OFF, not used, not used */
+#define LDO_EXT_SETTING		0x00
+/* BUCK 0x7D: 1.2V, ON, SLEEP_A and B, SLEEP low power */
+#define BUCK_SETTING	0x7D
+/* BUCK SLEEP 0xAC: 1.05V, Not used, SLEEP_A and B, Not used */
+#define BUCK_SLEEP_SETTING	0xAC
+
+static struct regulator_consumer_supply supply_ldo_c[] = {
+	{
+		.dev_name = "ab3100-codec",
+		.supply = "vaudio", /* Powers the codec */
+	},
+};
+
+/*
+ * This one needs to be a supply so we can turn it off
+ * in order to shut down the system.
+ */
+static struct regulator_consumer_supply supply_ldo_d[] = {
+	{
+		.dev = NULL,
+		.supply = "vana15", /* Powers the SoC (CPU etc) */
+	},
+};
+
+static struct regulator_consumer_supply supply_ldo_g[] = {
+	{
+		.dev_name = "mmci",
+		.supply = "vmmc", /* Powers MMC/SD card */
+	},
+};
+
+static struct regulator_consumer_supply supply_ldo_h[] = {
+	{
+		.dev_name = "xgam_pdi",
+		.supply = "vdisp", /* Powers camera, display etc */
+	},
+};
+
+static struct regulator_consumer_supply supply_ldo_k[] = {
+	{
+		.dev_name = "irda",
+		.supply = "vir", /* Power IrDA */
+	},
+};
+
+/*
+ * This is a placeholder for whoever wish to use the
+ * external power.
+ */
+static struct regulator_consumer_supply supply_ldo_ext[] = {
+	{
+		.dev = NULL,
+		.supply = "vext", /* External power */
+	},
+};
+
+/* Preset (hardware defined) voltages for these regulators */
+#define LDO_A_VOLTAGE 2750000
+#define LDO_C_VOLTAGE 2650000
+#define LDO_D_VOLTAGE 2650000
+
+static struct ab3100_platform_data ab3100_plf_data = {
+	.reg_constraints = {
+		/* LDO A routing and constraints */
+		{
+			.constraints = {
+				.name = "vrad",
+				.min_uV = LDO_A_VOLTAGE,
+				.max_uV = LDO_A_VOLTAGE,
+				.valid_modes_mask = REGULATOR_MODE_NORMAL,
+				.always_on = 1,
+				.boot_on = 1,
+			},
+		},
+		/* LDO C routing and constraints */
+		{
+			.constraints = {
+				.min_uV = LDO_C_VOLTAGE,
+				.max_uV = LDO_C_VOLTAGE,
+				.valid_modes_mask = REGULATOR_MODE_NORMAL,
+			},
+			.num_consumer_supplies = ARRAY_SIZE(supply_ldo_c),
+			.consumer_supplies = supply_ldo_c,
+		},
+		/* LDO D routing and constraints */
+		{
+			.constraints = {
+				.min_uV = LDO_D_VOLTAGE,
+				.max_uV = LDO_D_VOLTAGE,
+				.valid_modes_mask = REGULATOR_MODE_NORMAL,
+				/*
+				 * Actually this is boot_on but we need
+				 * to reference count it externally to
+				 * be able to shut down the system.
+				 */
+			},
+			.num_consumer_supplies = ARRAY_SIZE(supply_ldo_d),
+			.consumer_supplies = supply_ldo_d,
+		},
+		/* LDO E routing and constraints */
+		{
+			.constraints = {
+				.name = "vio",
+				.min_uV = 1800000,
+				.max_uV = 1800000,
+				.valid_modes_mask = REGULATOR_MODE_NORMAL,
+				.valid_ops_mask =
+				REGULATOR_CHANGE_VOLTAGE |
+				REGULATOR_CHANGE_STATUS,
+				.always_on = 1,
+				.boot_on = 1,
+			},
+		},
+		/* LDO F routing and constraints */
+		{
+			.constraints = {
+				.name = "vana25",
+				.min_uV = 2500000,
+				.max_uV = 2500000,
+				.valid_modes_mask = REGULATOR_MODE_NORMAL,
+				.valid_ops_mask =
+				REGULATOR_CHANGE_VOLTAGE |
+				REGULATOR_CHANGE_STATUS,
+				.always_on = 1,
+				.boot_on = 1,
+			},
+		},
+		/* LDO G routing and constraints */
+		{
+			.constraints = {
+				.min_uV = 1500000,
+				.max_uV = 2850000,
+				.valid_modes_mask = REGULATOR_MODE_NORMAL,
+				.valid_ops_mask =
+				REGULATOR_CHANGE_VOLTAGE |
+				REGULATOR_CHANGE_STATUS,
+			},
+			.num_consumer_supplies = ARRAY_SIZE(supply_ldo_g),
+			.consumer_supplies = supply_ldo_g,
+		},
+		/* LDO H routing and constraints */
+		{
+			.constraints = {
+				.min_uV = 1200000,
+				.max_uV = 2750000,
+				.valid_modes_mask = REGULATOR_MODE_NORMAL,
+				.valid_ops_mask =
+				REGULATOR_CHANGE_VOLTAGE |
+				REGULATOR_CHANGE_STATUS,
+			},
+			.num_consumer_supplies = ARRAY_SIZE(supply_ldo_h),
+			.consumer_supplies = supply_ldo_h,
+		},
+		/* LDO K routing and constraints */
+		{
+			.constraints = {
+				.min_uV = 1800000,
+				.max_uV = 2750000,
+				.valid_modes_mask = REGULATOR_MODE_NORMAL,
+				.valid_ops_mask =
+				REGULATOR_CHANGE_VOLTAGE |
+				REGULATOR_CHANGE_STATUS,
+			},
+			.num_consumer_supplies = ARRAY_SIZE(supply_ldo_k),
+			.consumer_supplies = supply_ldo_k,
+		},
+		/* External regulator interface. No fixed voltage specified.
+		 * If we knew the voltage of the external regulator and it
+		 * was connected on the board, we could add the (fixed)
+		 * voltage for it here.
+		 */
+		{
+			.constraints = {
+				.min_uV = 0,
+				.max_uV = 0,
+				.valid_modes_mask = REGULATOR_MODE_NORMAL,
+				.valid_ops_mask =
+				REGULATOR_CHANGE_STATUS,
+			},
+			.num_consumer_supplies = ARRAY_SIZE(supply_ldo_ext),
+			.consumer_supplies = supply_ldo_ext,
+		},
+		/* Buck converter routing and constraints */
+		{
+			.constraints = {
+				.name = "vcore",
+				.min_uV = 1200000,
+				.max_uV = 1800000,
+				.valid_modes_mask = REGULATOR_MODE_NORMAL,
+				.valid_ops_mask =
+				REGULATOR_CHANGE_VOLTAGE |
+				REGULATOR_CHANGE_STATUS,
+				.always_on = 1,
+				.boot_on = 1,
+			},
+		},
+	},
+	.reg_initvals = {
+		LDO_A_SETTING,
+		LDO_C_SETTING,
+		LDO_E_SETTING,
+		LDO_E_SLEEP_SETTING,
+		LDO_F_SETTING,
+		LDO_G_SETTING,
+		LDO_H_SETTING,
+		LDO_K_SETTING,
+		LDO_EXT_SETTING,
+		BUCK_SETTING,
+		BUCK_SLEEP_SETTING,
+		LDO_D_SETTING,
+	},
+};
+
 static struct i2c_board_info __initdata bus0_i2c_board_info[] = {
 	{
 		.type = "ab3100",
 		.addr = 0x48,
 		.irq = IRQ_U300_IRQ0_EXT,
+		.platform_data = &ab3100_plf_data,
 	},
 };
 
@@ -38,6 +281,11 @@
 {
 	i2c_register_board_info(0, bus0_i2c_board_info,
 				ARRAY_SIZE(bus0_i2c_board_info));
+	/*
+	 * This makes the core shut down all unused regulators
+	 * after all the initcalls have completed.
+	 */
+	regulator_has_full_constraints();
 	i2c_register_board_info(1, bus1_i2c_board_info,
 				ARRAY_SIZE(bus1_i2c_board_info));
 }
diff --git a/arch/arm/mach-u300/regulator.c b/arch/arm/mach-u300/regulator.c
new file mode 100644
index 0000000..9c53f01
--- /dev/null
+++ b/arch/arm/mach-u300/regulator.c
@@ -0,0 +1,88 @@
+/*
+ * arch/arm/mach-u300/regulator.c
+ *
+ * Copyright (C) 2009 ST-Ericsson AB
+ * License terms: GNU General Public License (GPL) version 2
+ * Handle board-bound regulators and board power not related
+ * to any devices.
+ * Author: Linus Walleij <linus.walleij@stericsson.com>
+ */
+#include <linux/device.h>
+#include <linux/signal.h>
+#include <linux/err.h>
+#include <linux/regulator/consumer.h>
+/* Those are just for writing in syscon */
+#include <linux/io.h>
+#include <mach/hardware.h>
+#include <mach/syscon.h>
+
+/*
+ * Regulators that power the board and chip and which are
+ * not copuled to specific drivers are hogged in these
+ * instances.
+ */
+static struct regulator *main_power_15;
+
+/*
+ * This function is used from pm.h to shut down the system by
+ * resetting all regulators in turn and then disable regulator
+ * LDO D (main power).
+ */
+void u300_pm_poweroff(void)
+{
+	sigset_t old, all;
+
+	sigfillset(&all);
+	if (!sigprocmask(SIG_BLOCK, &all, &old)) {
+		/* Disable LDO D to shut down the system */
+		if (main_power_15)
+			regulator_disable(main_power_15);
+		else
+			pr_err("regulator not available to shut down system\n");
+		(void) sigprocmask(SIG_SETMASK, &old, NULL);
+	}
+	return;
+}
+
+/*
+ * Hog the regulators needed to power up the board.
+ */
+static int __init u300_init_boardpower(void)
+{
+	int err;
+	u32 val;
+
+	pr_info("U300: setting up board power\n");
+	main_power_15 = regulator_get(NULL, "vana15");
+	if (IS_ERR(main_power_15)) {
+		pr_err("could not get vana15");
+		return PTR_ERR(main_power_15);
+	}
+	err = regulator_enable(main_power_15);
+	if (err) {
+		pr_err("could not enable vana15\n");
+		return err;
+	}
+
+	/*
+	 * On U300 a special system controller register pulls up the DC
+	 * until the vana15 (LDO D) regulator comes up. At this point, all
+	 * regulators are set and we do not need power control via
+	 * DC ON anymore. This function will likely be moved whenever
+	 * the rest of the U300 power management is implemented.
+	 */
+	pr_info("U300: disable system controller pull-up\n");
+	val = readw(U300_SYSCON_VBASE + U300_SYSCON_PMCR);
+	val &= ~U300_SYSCON_PMCR_DCON_ENABLE;
+	writew(val, U300_SYSCON_VBASE + U300_SYSCON_PMCR);
+
+	/* Register globally exported PM poweroff hook */
+	pm_power_off = u300_pm_poweroff;
+
+	return 0;
+}
+
+/*
+ * So at module init time we hog the regulator!
+ */
+module_init(u300_init_boardpower);