Date:	Fri, 20 Apr 2012 00:38:40 +0800
From:	"Ying-Chun Liu (PaulLiu)" <paul.liu@...aro.org>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, linaro-dev@...ts.linaro.org,
	patches@...aro.org,
	"Ying-Chun Liu (PaulLiu)" <paul.liu@...aro.org>,
	Robin Gong <B38343@...escale.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Shawn Guo <shawn.guo@...aro.org>
Subject: [PATCH 1/2] mfd: Add Freescale's PMIC MC34708 support

From: "Ying-Chun Liu (PaulLiu)" <paul.liu@...aro.org>

Freescale MC34708 is a PMIC which supports the following features:
 * 6 multi-mode buck regulators
 * Boost regulator for USB OTG.
 * 8 regulators for thermal budget optimization
 * 10-bit ADC
 * Real time clock

Signed-off-by: Robin Gong <B38343@...escale.com>
Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@...aro.org>
Cc: Samuel Ortiz <sameo@...ux.intel.com>
Cc: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc: Shawn Guo <shawn.guo@...aro.org>
---
 Documentation/devicetree/bindings/mfd/mc34708.txt |   61 ++
 drivers/mfd/Kconfig                               |   11 +
 drivers/mfd/Makefile                              |    1 +
 drivers/mfd/mc34708-core.c                        |  634 +++++++++++++++++++++
 include/linux/mfd/mc34708.h                       |  134 +++++
 5 files changed, 841 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/mc34708.txt
 create mode 100644 drivers/mfd/mc34708-core.c
 create mode 100644 include/linux/mfd/mc34708.h

diff --git a/Documentation/devicetree/bindings/mfd/mc34708.txt b/Documentation/devicetree/bindings/mfd/mc34708.txt
new file mode 100644
index 0000000..2bb5c9e
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/mc34708.txt
@@ -0,0 +1,61 @@
+* Freescale MC34708 Power Management Integrated Circuit (PMIC)
+
+Required properties:
+- compatible : Must be "fsl,mc34708"
+
+Optional properties:
+- fsl,mc34708-uses-adc   : Indicate the ADC is being used
+- fsl,mc34708-uses-rtc   : Indicate the RTC is being used
+- fsl,mc34708-uses-ts    : Indicate the touchscreen controller is being used
+
+Sub-nodes:
+- regulators : Contain the regulator nodes.  The MC34708 regulators are
+  bound using their names as listed below for enabling.
+
+    mc34708__sw1a    : regulator SW1A
+    mc34708__sw1b    : regulator SW1B
+    mc34708__sw2     : regulator SW2
+    mc34708__sw3     : regulator SW3
+    mc34708__sw4A    : regulator SW4A
+    mc34708__sw4b    : regulator SW4B
+    mc34708__swbst   : regulator SWBST
+    mc34708__vpll    : regulator VPLL
+    mc34708__vrefddr : regulator VREFDDR
+    mc34708__vusb    : regulator VUSB
+    mc34708__vusb2   : regulator VUSB2
+    mc34708__vdac    : regulator VDAC
+    mc34708__vgen1   : regulator VGEN1
+    mc34708__vgen2   : regulator VGEN2
+
+  The bindings details of individual regulator device can be found in:
+  Documentation/devicetree/bindings/regulator/regulator.txt
+
+Examples:
+
+i2c@...c8000 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	compatible = "fsl,imx53-i2c", "fsl,imx1-i2c";
+	reg = <0x63fc8000 0x4000>;
+	interrupts = <62>;
+	status = "okay";
+
+	pmic: mc34708@8 {
+		compatible = "fsl,mc34708";
+		reg = <0x08>;
+
+		regulators {
+			mc34708__sw1a {
+				regulator-min-microvolt = <650000>;
+				regulator-max-microvolt = <1437500>;
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			mc34708__vusb {
+				regulator-boot-on;
+				regulator-always-on;
+			};
+		};
+	};
+};
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 29f463c..17b6cc5 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -600,6 +600,17 @@ config MFD_MC13XXX
 	  additional drivers must be enabled in order to use the
 	  functionality of the device.
 
+config MFD_MC34708
+	tristate "Support for Freescale's PMIC MC34708"
+	depends on I2C
+	depends on OF
+	select MFD_CORE
+	help
+	  Support for the Freescale's PMIC MC34708
+	  This driver provides common support for accessing the device,
+	  additional drivers must be enabled in order to use the
+	  functionality of the device.
+
 config ABX500_CORE
 	bool "ST-Ericsson ABX500 Mixed Signal Circuit register functions"
 	default y if ARCH_U300 || ARCH_U8500
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 05fa538..b98d943 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -54,6 +54,7 @@ obj-$(CONFIG_TWL6030_PWM)	+= twl6030-pwm.o
 obj-$(CONFIG_TWL6040_CORE)	+= twl6040-core.o twl6040-irq.o
 
 obj-$(CONFIG_MFD_MC13XXX)	+= mc13xxx-core.o
+obj-$(CONFIG_MFD_MC34708)       += mc34708-core.o
 
 obj-$(CONFIG_MFD_CORE)		+= mfd-core.o
 
diff --git a/drivers/mfd/mc34708-core.c b/drivers/mfd/mc34708-core.c
new file mode 100644
index 0000000..54f469b
--- /dev/null
+++ b/drivers/mfd/mc34708-core.c
@@ -0,0 +1,634 @@
+/*
+ * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/mc34708.h>
+#include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+struct mc34708 {
+	struct i2c_client *i2c_client;
+	struct mutex lock;
+	int irq;
+
+	irq_handler_t irqhandler[MC34708_NUM_IRQ];
+	void *irqdata[MC34708_NUM_IRQ];
+};
+
+/*!
+ * This is the enumeration of versions of PMIC
+ */
+enum mc34708_id {
+	MC_PMIC_ID_MC34708,
+	MC_PMIC_ID_INVALID,
+};
+
+struct mc34708_version_t {
+	/*!
+	 * PMIC version identifier.
+	 */
+	enum mc34708_id id;
+	/*!
+	 * Revision of the PMIC.
+	 */
+	int revision;
+};
+
+#define PMIC_I2C_RETRY_TIMES		10
+
+static const struct i2c_device_id mc34708_device_id[] = {
+	{"mc34708", MC_PMIC_ID_MC34708},
+	{},
+};
+
+static const char * const mc34708_chipname[] = {
+	[MC_PMIC_ID_MC34708] = "mc34708",
+};
+
+void mc34708_lock(struct mc34708 *mc_pmic)
+{
+	if (!mutex_trylock(&mc_pmic->lock)) {
+		dev_dbg(&mc_pmic->i2c_client->dev, "wait for %s from %pf\n",
+			__func__, __builtin_return_address(0));
+
+		mutex_lock(&mc_pmic->lock);
+	}
+	dev_dbg(&mc_pmic->i2c_client->dev, "%s from %pf\n",
+		__func__, __builtin_return_address(0));
+}
+EXPORT_SYMBOL(mc34708_lock);
+
+void mc34708_unlock(struct mc34708 *mc_pmic)
+{
+	dev_dbg(&mc_pmic->i2c_client->dev, "%s from %pf\n",
+		__func__, __builtin_return_address(0));
+	mutex_unlock(&mc_pmic->lock);
+}
+EXPORT_SYMBOL(mc34708_unlock);
+
+static int mc34708_i2c_24bit_read(struct i2c_client *client,
+				  unsigned int offset,
+				  unsigned int *value)
+{
+	unsigned char buf[3];
+	int ret;
+	int i;
+
+	memset(buf, 0, 3);
+	for (i = 0; i < PMIC_I2C_RETRY_TIMES; i++) {
+		ret = i2c_smbus_read_i2c_block_data(client, offset, 3, buf);
+		if (ret == 3)
+			break;
+		usleep_range(1000, 1500);
+	}
+
+	if (ret == 3) {
+		*value = buf[0] << 16 | buf[1] << 8 | buf[2];
+		return ret;
+	} else {
+		dev_err(&client->dev, "24bit read error, ret = %d\n", ret);
+		return -1;	/* return -1 on failure */
+	}
+}
+
+int mc34708_reg_read(struct mc34708 *mc_pmic, unsigned int offset,
+		     u32 *val)
+{
+	BUG_ON(!mutex_is_locked(&mc_pmic->lock));
+
+	if (offset > MC34708_NUMREGS)
+		return -EINVAL;
+
+	if (mc34708_i2c_24bit_read(mc_pmic->i2c_client, offset, val) == -1)
+		return -1;
+	*val &= 0xffffff;
+
+	dev_vdbg(&mc_pmic->i2c_client->dev, "mc_pmic read [%02d] -> 0x%06x\n",
+		 offset, *val);
+
+	return 0;
+}
+EXPORT_SYMBOL(mc34708_reg_read);
+
+static int mc34708_i2c_24bit_write(struct i2c_client *client,
+				   unsigned int offset, unsigned int reg_val)
+{
+	char buf[3];
+	int ret;
+	int i;
+
+	buf[0] = (reg_val >> 16) & 0xff;
+	buf[1] = (reg_val >> 8) & 0xff;
+	buf[2] = (reg_val) & 0xff;
+
+	for (i = 0; i < PMIC_I2C_RETRY_TIMES; i++) {
+		ret = i2c_smbus_write_i2c_block_data(client, offset, 3, buf);
+		if (ret == 0)
+			break;
+		usleep_range(1000, 1500);
+	}
+	if (i == PMIC_I2C_RETRY_TIMES)
+		dev_err(&client->dev, "24bit write error, ret = %d\n", ret);
+
+	return ret;
+}
+
+int mc34708_reg_write(struct mc34708 *mc_pmic, unsigned int offset, u32 val)
+{
+	BUG_ON(!mutex_is_locked(&mc_pmic->lock));
+
+	if (offset > MC34708_NUMREGS)
+		return -EINVAL;
+
+	if (mc34708_i2c_24bit_write(mc_pmic->i2c_client, offset, val))
+		return -1;
+	val &= 0xffffff;
+
+	dev_vdbg(&mc_pmic->i2c_client->dev, "mc_pmic write[%02d] -> 0x%06x\n",
+		 offset, val);
+
+	return 0;
+}
+EXPORT_SYMBOL(mc34708_reg_write);
+
+int mc34708_reg_rmw(struct mc34708 *mc_pmic, unsigned int offset, u32 mask,
+		    u32 val)
+{
+	int ret;
+	u32 valread;
+
+	BUG_ON(val & ~mask);
+
+	ret = mc34708_reg_read(mc_pmic, offset, &valread);
+	if (ret)
+		return ret;
+
+	valread = (valread & ~mask) | val;
+
+	return mc34708_reg_write(mc_pmic, offset, valread);
+}
+EXPORT_SYMBOL(mc34708_reg_rmw);
+
+int mc34708_irq_mask(struct mc34708 *mc_pmic, int irq)
+{
+	int ret;
+	unsigned int offmask =
+	    irq < 24 ? MC34708_REG_INT_MASK0 : MC34708_REG_INT_MASK1;
+	u32 irqbit = 1 << (irq < 24 ? irq : irq - 24);
+	u32 mask;
+
+	if (irq < 0 || irq >= MC34708_NUM_IRQ)
+		return -EINVAL;
+
+	ret = mc34708_reg_read(mc_pmic, offmask, &mask);
+	if (ret)
+		return ret;
+
+	if (mask & irqbit)
+		/* already masked */
+		return 0;
+
+	return mc34708_reg_write(mc_pmic, offmask, mask | irqbit);
+}
+EXPORT_SYMBOL(mc34708_irq_mask);
+
+int mc34708_irq_unmask(struct mc34708 *mc_pmic, int irq)
+{
+	int ret;
+	unsigned int offmask =
+	    irq < 24 ? MC34708_REG_INT_MASK0 : MC34708_REG_INT_MASK1;
+	u32 irqbit = 1 << (irq < 24 ? irq : irq - 24);
+	u32 mask;
+
+	if (irq < 0 || irq >= MC34708_NUM_IRQ)
+		return -EINVAL;
+
+	ret = mc34708_reg_read(mc_pmic, offmask, &mask);
+	if (ret)
+		return ret;
+
+	if (!(mask & irqbit))
+		/* already unmasked */
+		return 0;
+
+	return mc34708_reg_write(mc_pmic, offmask, mask & ~irqbit);
+}
+EXPORT_SYMBOL(mc34708_irq_unmask);
+
+int mc34708_irq_status(struct mc34708 *mc_pmic, int irq, int *enabled,
+		       int *pending)
+{
+	int ret;
+	unsigned int offmask =
+	    irq < 24 ? MC34708_REG_INT_MASK0 : MC34708_REG_INT_MASK1;
+	unsigned int offstat =
+	    irq < 24 ? MC34708_REG_INT_STATUS0 : MC34708_REG_INT_STATUS1;
+	u32 irqbit = 1 << (irq < 24 ? irq : irq - 24);
+
+	if (irq < 0 || irq >= MC34708_NUM_IRQ)
+		return -EINVAL;
+
+	if (enabled) {
+		u32 mask;
+
+		ret = mc34708_reg_read(mc_pmic, offmask, &mask);
+		if (ret)
+			return ret;
+
+		*enabled = mask & irqbit;
+	}
+
+	if (pending) {
+		u32 stat;
+
+		ret = mc34708_reg_read(mc_pmic, offstat, &stat);
+		if (ret)
+			return ret;
+
+		*pending = stat & irqbit;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(mc34708_irq_status);
+
+int mc34708_irq_ack(struct mc34708 *mc_pmic, int irq)
+{
+	unsigned int offstat =
+	    irq < 24 ? MC34708_REG_INT_STATUS0 : MC34708_REG_INT_STATUS1;
+	unsigned int val = 1 << (irq < 24 ? irq : irq - 24);
+
+	BUG_ON(irq < 0 || irq >= MC34708_NUM_IRQ);
+
+	return mc34708_reg_write(mc_pmic, offstat, val);
+}
+EXPORT_SYMBOL(mc34708_irq_ack);
+
+int mc34708_irq_request_nounmask(struct mc34708 *mc_pmic, int irq,
+				 irq_handler_t handler, const char *name,
+				 void *dev)
+{
+	BUG_ON(!mutex_is_locked(&mc_pmic->lock));
+	BUG_ON(!handler);
+
+	if (irq < 0 || irq >= MC34708_NUM_IRQ)
+		return -EINVAL;
+
+	if (mc_pmic->irqhandler[irq])
+		return -EBUSY;
+
+	mc_pmic->irqhandler[irq] = handler;
+	mc_pmic->irqdata[irq] = dev;
+
+	return 0;
+}
+EXPORT_SYMBOL(mc34708_irq_request_nounmask);
+
+int mc34708_irq_request(struct mc34708 *mc_pmic, int irq,
+			irq_handler_t handler, const char *name, void *dev)
+{
+	int ret;
+
+	ret = mc34708_irq_request_nounmask(mc_pmic, irq, handler, name, dev);
+	if (ret)
+		return ret;
+
+	ret = mc34708_irq_unmask(mc_pmic, irq);
+	if (ret) {
+		mc_pmic->irqhandler[irq] = NULL;
+		mc_pmic->irqdata[irq] = NULL;
+		return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(mc34708_irq_request);
+
+int mc34708_irq_free(struct mc34708 *mc_pmic, int irq, void *dev)
+{
+	int ret;
+	BUG_ON(!mutex_is_locked(&mc_pmic->lock));
+
+	if (irq < 0 || irq >= MC34708_NUM_IRQ || !mc_pmic->irqhandler[irq] ||
+	    mc_pmic->irqdata[irq] != dev)
+		return -EINVAL;
+
+	ret = mc34708_irq_mask(mc_pmic, irq);
+	if (ret)
+		return ret;
+
+	mc_pmic->irqhandler[irq] = NULL;
+	mc_pmic->irqdata[irq] = NULL;
+
+	return 0;
+}
+EXPORT_SYMBOL(mc34708_irq_free);
+
+static inline irqreturn_t mc34708_irqhandler(struct mc34708 *mc_pmic, int irq)
+{
+	return mc_pmic->irqhandler[irq] (irq, mc_pmic->irqdata[irq]);
+}
+
+/*
+ * returns: number of handled irqs or negative error
+ * locking: holds mc_pmic->lock
+ */
+static int mc34708_irq_handle(struct mc34708 *mc_pmic,
+			      unsigned int offstat, unsigned int offmask,
+			      int baseirq)
+{
+	u32 stat, mask;
+	int ret = mc34708_reg_read(mc_pmic, offstat, &stat);
+	int num_handled = 0;
+
+	if (ret)
+		return ret;
+
+	ret = mc34708_reg_read(mc_pmic, offmask, &mask);
+	if (ret)
+		return ret;
+
+	while (stat & ~mask) {
+		int irq = __ffs(stat & ~mask);
+
+		stat &= ~(1 << irq);
+
+		if (likely(mc_pmic->irqhandler[baseirq + irq])) {
+			irqreturn_t handled;
+
+			handled = mc34708_irqhandler(mc_pmic, baseirq + irq);
+			if (handled == IRQ_HANDLED)
+				num_handled++;
+		} else {
+			dev_err(&mc_pmic->i2c_client->dev,
+				"BUG: irq %u but no handler\n", baseirq + irq);
+
+			mask |= 1 << irq;
+
+			ret = mc34708_reg_write(mc_pmic, offmask, mask);
+		}
+	}
+
+	return num_handled;
+}
+
+static irqreturn_t mc34708_irq_thread(int irq, void *data)
+{
+	struct mc34708 *mc_pmic = data;
+	irqreturn_t ret;
+	int handled = 0;
+
+	mc34708_lock(mc_pmic);
+
+	ret = mc34708_irq_handle(mc_pmic, MC34708_REG_INT_STATUS0,
+				 MC34708_REG_INT_MASK0, 0);
+	if (ret > 0)
+		handled = 1;
+
+	ret = mc34708_irq_handle(mc_pmic, MC34708_REG_INT_STATUS1,
+				 MC34708_REG_INT_MASK1, 24);
+	if (ret > 0)
+		handled = 1;
+
+	mc34708_unlock(mc_pmic);
+
+	return IRQ_RETVAL(handled);
+}
+
+#define maskval(reg, mask)	(((reg) & (mask)) >> __ffs(mask))
+static int mc34708_identify(struct mc34708 *mc_pmic,
+			    struct mc34708_version_t *ver)
+{
+	int rev_id = 0;
+	int rev1 = 0;
+	int rev2 = 0;
+	int finid = 0;
+	int icid = 0;
+	int ret;
+	ret = mc34708_reg_read(mc_pmic, MC34708_REG_IDENTIFICATION, &rev_id);
+	if (ret) {
+		dev_dbg(&mc_pmic->i2c_client->dev, "read ID error!%x\n", ret);
+		return ret;
+	}
+	rev1 = (rev_id & 0x018) >> 3;
+	rev2 = (rev_id & 0x007);
+	icid = (rev_id & 0x01C0) >> 6;
+	finid = (rev_id & 0x01E00) >> 9;
+	ver->id = MC_PMIC_ID_MC34708;
+
+	ver->revision = ((rev1 * 10) + rev2);
+	dev_dbg(&mc_pmic->i2c_client->dev,
+		"mc_pmic Rev %d.%d FinVer %x detected\n", rev1, rev2, finid);
+
+	return 0;
+}
+
+static const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id,
+						const struct i2c_client *client)
+{
+	while (id->name[0]) {
+		if (strcmp(client->name, id->name) == 0)
+			return id;
+		id++;
+	}
+
+	return NULL;
+}
+
+static const struct i2c_device_id *i2c_get_device_id(const struct i2c_client
+						     *idev)
+{
+	const struct i2c_driver *idrv = to_i2c_driver(idev->dev.driver);
+
+	return i2c_match_id(idrv->id_table, idev);
+}
+
+static const char *mc34708_get_chipname(struct mc34708 *mc_pmic)
+{
+	const struct i2c_device_id *devid =
+	    i2c_get_device_id(mc_pmic->i2c_client);
+
+	if (!devid)
+		return NULL;
+
+	return mc34708_chipname[devid->driver_data];
+}
+
+int mc34708_get_flags(struct mc34708 *mc_pmic)
+{
+	struct mc34708_platform_data *pdata =
+	    dev_get_platdata(&mc_pmic->i2c_client->dev);
+
+	return pdata->flags;
+}
+EXPORT_SYMBOL(mc34708_get_flags);
+
+static int mc34708_add_subdevice_pdata(struct mc34708 *mc_pmic,
+				       const char *format, void *pdata,
+				       size_t pdata_size)
+{
+	char buf[30];
+	const char *name = mc34708_get_chipname(mc_pmic);
+
+	struct mfd_cell cell = {
+		.platform_data = pdata,
+		.pdata_size = pdata_size,
+	};
+
+	/* there is no asnprintf in the kernel :-( */
+	if (snprintf(buf, sizeof(buf), format, name) > sizeof(buf))
+		return -E2BIG;
+
+	cell.name = kmemdup(buf, strlen(buf) + 1, GFP_KERNEL);
+	if (!cell.name)
+		return -ENOMEM;
+
+	return mfd_add_devices(&mc_pmic->i2c_client->dev, -1, &cell, 1, NULL,
+			       0);
+}
+
+static int mc34708_add_subdevice(struct mc34708 *mc_pmic, const char *format)
+{
+	return mc34708_add_subdevice_pdata(mc_pmic, format, NULL, 0);
+}
+
+static int mc34708_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	struct mc34708 *mc_pmic;
+	struct mc34708_version_t version;
+	struct mc34708_platform_data *pdata = client->dev.platform_data;
+	struct device_node *np = client->dev.of_node;
+	int ret;
+
+	mc_pmic = kzalloc(sizeof(*mc_pmic), GFP_KERNEL);
+	if (!mc_pmic)
+		return -ENOMEM;
+	i2c_set_clientdata(client, mc_pmic);
+	mc_pmic->i2c_client = client;
+
+	mutex_init(&mc_pmic->lock);
+	mc34708_lock(mc_pmic);
+	mc34708_identify(mc_pmic, &version);
+	/* mask all irqs */
+	ret = mc34708_reg_write(mc_pmic, MC34708_REG_INT_MASK0, 0x00ffffff);
+	if (ret)
+		goto err_mask;
+
+	ret = mc34708_reg_write(mc_pmic, MC34708_REG_INT_MASK1, 0x00ffffff);
+	if (ret)
+		goto err_mask;
+
+	ret = request_threaded_irq(client->irq, NULL, mc34708_irq_thread,
+				   IRQF_ONESHOT | IRQF_TRIGGER_HIGH, "mc_pmic",
+				   mc_pmic);
+
+	if (ret) {
+ err_mask:
+		mc34708_unlock(mc_pmic);
+		dev_set_drvdata(&client->dev, NULL);
+		kfree(mc_pmic);
+		return ret;
+	}
+
+	mc34708_unlock(mc_pmic);
+
+	if (pdata && pdata->flags & MC34708_USE_ADC)
+		mc34708_add_subdevice(mc_pmic, "%s-adc");
+	else if (of_get_property(np, "fsl,mc34708-uses-adc", NULL))
+		mc34708_add_subdevice(mc_pmic, "%s-adc");
+
+
+	if (pdata && pdata->flags & MC34708_USE_REGULATOR) {
+		struct mc34708_regulator_platform_data regulator_pdata = {
+			.num_regulators = pdata->num_regulators,
+			.regulators = pdata->regulators,
+		};
+
+		mc34708_add_subdevice_pdata(mc_pmic, "%s-regulator",
+					    &regulator_pdata,
+					    sizeof(regulator_pdata));
+	} else if (of_find_node_by_name(np, "regulators")) {
+		mc34708_add_subdevice(mc_pmic, "%s-regulator");
+	}
+
+	if (pdata && pdata->flags & MC34708_USE_RTC)
+		mc34708_add_subdevice(mc_pmic, "%s-rtc");
+	else if (of_get_property(np, "fsl,mc34708-uses-rtc", NULL))
+		mc34708_add_subdevice(mc_pmic, "%s-rtc");
+
+	if (pdata && pdata->flags & MC34708_USE_TOUCHSCREEN)
+		mc34708_add_subdevice(mc_pmic, "%s-ts");
+	else if (of_get_property(np, "fsl,mc34708-uses-ts", NULL))
+		mc34708_add_subdevice(mc_pmic, "%s-ts");
+
+	return 0;
+}
+
+static int __devexit mc34708_remove(struct i2c_client *client)
+{
+	struct mc34708 *mc_pmic = dev_get_drvdata(&client->dev);
+
+	free_irq(mc_pmic->i2c_client->irq, mc_pmic);
+
+	mfd_remove_devices(&client->dev);
+
+	kfree(mc_pmic);
+
+	return 0;
+}
+
+static const struct of_device_id mc34708_dt_ids[] = {
+	{ .compatible = "fsl,mc34708" },
+	{ /* sentinel */ }
+};
+
+static struct i2c_driver mc34708_driver = {
+	.id_table = mc34708_device_id,
+	.driver = {
+		   .name = "mc34708",
+		   .owner = THIS_MODULE,
+		   .of_match_table = mc34708_dt_ids,
+		   },
+	.probe = mc34708_probe,
+	.remove = __devexit_p(mc34708_remove),
+};
+
+static int __init mc34708_init(void)
+{
+	return i2c_add_driver(&mc34708_driver);
+}
+subsys_initcall(mc34708_init);
+
+static void __exit mc34708_exit(void)
+{
+	i2c_del_driver(&mc34708_driver);
+}
+module_exit(mc34708_exit);
+
+MODULE_DESCRIPTION("Core driver for Freescale MC34708 PMIC");
+MODULE_AUTHOR("Robin Gong <B38343@...escale.com>, "
+	      "Ying-Chun Liu (PaulLiu) <paul.liu@...aro.org>");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/mfd/mc34708.h b/include/linux/mfd/mc34708.h
new file mode 100644
index 0000000..505813d
--- /dev/null
+++ b/include/linux/mfd/mc34708.h
@@ -0,0 +1,134 @@
+/* For mc34708's pmic driver
+ * Copyright (C) 2004-2011 Freescale Semiconductor, Inc.
+ *
+ * based on:
+ * Copyright 2009-2010 Pengutronix, Uwe Kleine-Koenig
+ * <u.kleine-koenig@...gutronix.de>
+ *
+ * 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.
+ */
+#ifndef __LINUX_MFD_MC_34708_H
+#define __LINUX_MFD_MC_34708_H
+
+#include <linux/interrupt.h>
+#include <linux/regulator/driver.h>
+
+struct mc34708;
+
+void mc34708_lock(struct mc34708 *mc_pmic);
+void mc34708_unlock(struct mc34708 *mc_pmic);
+
+int mc34708_reg_read(struct mc34708 *mc_pmic, unsigned int offset, u32 *val);
+int mc34708_reg_write(struct mc34708 *mc_pmic, unsigned int offset, u32 val);
+int mc34708_reg_rmw(struct mc34708 *mc_pmic, unsigned int offset,
+		    u32 mask, u32 val);
+
+int mc34708_get_flags(struct mc34708 *mc_pmic);
+
+int mc34708_irq_request(struct mc34708 *mc_pmic, int irq,
+			irq_handler_t handler, const char *name, void *dev);
+int mc34708_irq_request_nounmask(struct mc34708 *mc_pmic, int irq,
+				 irq_handler_t handler, const char *name,
+				 void *dev);
+int mc34708_irq_free(struct mc34708 *mc_pmic, int irq, void *dev);
+int mc34708_irq_mask(struct mc34708 *mc_pmic, int irq);
+int mc34708_irq_unmask(struct mc34708 *mc_pmic, int irq);
+int mc34708_irq_status(struct mc34708 *mc_pmic, int irq,
+		       int *enabled, int *pending);
+int mc34708_irq_ack(struct mc34708 *mc_pmic, int irq);
+
+int mc34708_get_flags(struct mc34708 *mc_pmic);
+
+#define MC34708_SW1A		0
+#define MC34708_SW1B		1
+#define MC34708_SW2		2
+#define MC34708_SW3		3
+#define MC34708_SW4A		4
+#define MC34708_SW4B		5
+#define MC34708_SW5		6
+#define MC34708_SWBST		7
+#define MC34708_VPLL		8
+#define MC34708_VREFDDR		9
+#define MC34708_VUSB		10
+#define MC34708_VUSB2		11
+#define MC34708_VDAC		12
+#define MC34708_VGEN1		13
+#define MC34708_VGEN2		14
+#define MC34708_REGU_NUM	15
+
+#define MC34708_REG_INT_STATUS0		0
+#define MC34708_REG_INT_MASK0		1
+#define MC34708_REG_INT_STATUS1		3
+#define MC34708_REG_INT_MASK1		4
+#define MC34708_REG_IDENTIFICATION	7
+
+#define MC34708_IRQ_ADCDONE	0
+#define MC34708_IRQ_TSDONE	1
+#define MC34708_IRQ_TSPENDET	2
+#define MC34708_IRQ_USBDET	3
+#define MC34708_IRQ_AUXDET	4
+#define MC34708_IRQ_USBOVP	5
+#define MC34708_IRQ_AUXOVP	6
+#define MC34708_IRQ_CHRTIMEEXP	7
+#define MC34708_IRQ_BATTOTP	8
+#define MC34708_IRQ_BATTOVP	9
+#define MC34708_IRQ_CHRCMPL	10
+#define MC34708_IRQ_WKVBUSDET	11
+#define MC34708_IRQ_WKAUXDET	12
+#define MC34708_IRQ_LOWBATT	13
+#define MC34708_IRQ_VBUSREGMI	14
+#define MC34708_IRQ_ATTACH	15
+#define MC34708_IRQ_DETACH	16
+#define MC34708_IRQ_KP		17
+#define MC34708_IRQ_LKP		18
+#define MC34708_IRQ_LKR		19
+#define MC34708_IRQ_UKNOW_ATTA	20
+#define MC34708_IRQ_ADC_CHANGE	21
+#define MC34708_IRQ_STUCK_KEY	22
+#define MC34708_IRQ_STUCK_KEY_RCV	23
+#define MC34708_IRQ_1HZ		24
+#define MC34708_IRQ_TODA	25
+#define MC34708_IRQ_UNUSED1	26
+#define MC34708_IRQ_PWRON1	27
+#define MC34708_IRQ_PWRON2	28
+#define MC34708_IRQ_WDIRESET	29
+#define MC34708_IRQ_SYSRST	30
+#define MC34708_IRQ_RTCRST	31
+#define MC34708_IRQ_PCI		32
+#define MC34708_IRQ_WARM	33
+#define MC34708_IRQ_MEMHLD	34
+#define MC34708_IRQ_UNUSED2	35
+#define MC34708_IRQ_THWARNL	36
+#define MC34708_IRQ_THWARNH	37
+#define MC34708_IRQ_CLK		38
+#define MC34708_IRQ_UNUSED3	39
+#define MC34708_IRQ_SCP		40
+#define MC34708_NUMREGS		0x3f
+#define MC34708_NUM_IRQ		46
+
+struct mc34708_regulator_init_data {
+	int id;
+	struct regulator_init_data *init_data;
+};
+
+struct mc34708_regulator_platform_data {
+	int num_regulators;
+	struct mc34708_regulator_init_data *regulators;
+};
+
+struct mc34708_platform_data {
+#define MC34708_USE_TOUCHSCREEN (1 << 0)
+#define MC34708_USE_CODEC	(1 << 1)
+#define MC34708_USE_ADC		(1 << 2)
+#define MC34708_USE_RTC		(1 << 3)
+#define MC34708_USE_REGULATOR	(1 << 4)
+#define MC34708_USE_LED		(1 << 5)
+	unsigned int flags;
+
+	int num_regulators;
+	struct mc34708_regulator_init_data *regulators;
+};
+
+#endif				/* ifndef __LINUX_MFD_MC_PMIC_H */
-- 
1.7.9.5

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