drivers/regulator/mc13892-regulator.c - kernel/quantenna - Git at Google

 /*
  * Regulator Driver for Freescale MC13892 PMIC
  *
  * Copyright 2010 Yong Shen <yong.shen@linaro.org>
  *
  * Based on draft driver from Arnaud Patard <arnaud.patard@rtp-net.org>
  *
  * 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/mfd/mc13892.h>
 #include <linux/regulator/machine.h>
 #include <linux/regulator/driver.h>
 #include <linux/platform_device.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/module.h>
 #include "mc13xxx.h"

 #define MC13892_REVISION			7

 #define MC13892_POWERCTL0			13
 #define MC13892_POWERCTL0_USEROFFSPI		3
 #define MC13892_POWERCTL0_VCOINCELLVSEL		20
 #define MC13892_POWERCTL0_VCOINCELLVSEL_M	(7<<20)
 #define MC13892_POWERCTL0_VCOINCELLEN		(1<<23)

 #define MC13892_SWITCHERS0_SWxHI		(1<<23)

 #define MC13892_SWITCHERS0			24
 #define MC13892_SWITCHERS0_SW1VSEL		0
 #define MC13892_SWITCHERS0_SW1VSEL_M		(0x1f<<0)
 #define MC13892_SWITCHERS0_SW1HI		(1<<23)
 #define MC13892_SWITCHERS0_SW1EN		0

 #define MC13892_SWITCHERS1			25
 #define MC13892_SWITCHERS1_SW2VSEL		0
 #define MC13892_SWITCHERS1_SW2VSEL_M		(0x1f<<0)
 #define MC13892_SWITCHERS1_SW2HI		(1<<23)
 #define MC13892_SWITCHERS1_SW2EN		0

 #define MC13892_SWITCHERS2			26
 #define MC13892_SWITCHERS2_SW3VSEL		0
 #define MC13892_SWITCHERS2_SW3VSEL_M		(0x1f<<0)
 #define MC13892_SWITCHERS2_SW3HI		(1<<23)
 #define MC13892_SWITCHERS2_SW3EN		0

 #define MC13892_SWITCHERS3			27
 #define MC13892_SWITCHERS3_SW4VSEL		0
 #define MC13892_SWITCHERS3_SW4VSEL_M		(0x1f<<0)
 #define MC13892_SWITCHERS3_SW4HI		(1<<23)
 #define MC13892_SWITCHERS3_SW4EN		0

 #define MC13892_SWITCHERS4			28
 #define MC13892_SWITCHERS4_SW1MODE		0
 #define MC13892_SWITCHERS4_SW1MODE_AUTO		(8<<0)
 #define MC13892_SWITCHERS4_SW1MODE_M		(0xf<<0)
 #define MC13892_SWITCHERS4_SW2MODE		10
 #define MC13892_SWITCHERS4_SW2MODE_AUTO		(8<<10)
 #define MC13892_SWITCHERS4_SW2MODE_M		(0xf<<10)

 #define MC13892_SWITCHERS5			29
 #define MC13892_SWITCHERS5_SW3MODE		0
 #define MC13892_SWITCHERS5_SW3MODE_AUTO		(8<<0)
 #define MC13892_SWITCHERS5_SW3MODE_M		(0xf<<0)
 #define MC13892_SWITCHERS5_SW4MODE		8
 #define MC13892_SWITCHERS5_SW4MODE_AUTO		(8<<8)
 #define MC13892_SWITCHERS5_SW4MODE_M		(0xf<<8)
 #define MC13892_SWITCHERS5_SWBSTEN		(1<<20)

 #define MC13892_REGULATORSETTING0		30
 #define MC13892_REGULATORSETTING0_VGEN1VSEL	0
 #define MC13892_REGULATORSETTING0_VDIGVSEL	4
 #define MC13892_REGULATORSETTING0_VGEN2VSEL	6
 #define MC13892_REGULATORSETTING0_VPLLVSEL	9
 #define MC13892_REGULATORSETTING0_VUSB2VSEL	11
 #define MC13892_REGULATORSETTING0_VGEN3VSEL	14
 #define MC13892_REGULATORSETTING0_VCAMVSEL	16

 #define MC13892_REGULATORSETTING0_VGEN1VSEL_M	(3<<0)
 #define MC13892_REGULATORSETTING0_VDIGVSEL_M	(3<<4)
 #define MC13892_REGULATORSETTING0_VGEN2VSEL_M	(7<<6)
 #define MC13892_REGULATORSETTING0_VPLLVSEL_M	(3<<9)
 #define MC13892_REGULATORSETTING0_VUSB2VSEL_M	(3<<11)
 #define MC13892_REGULATORSETTING0_VGEN3VSEL_M	(1<<14)
 #define MC13892_REGULATORSETTING0_VCAMVSEL_M	(3<<16)

 #define MC13892_REGULATORSETTING1		31
 #define MC13892_REGULATORSETTING1_VVIDEOVSEL	2
 #define MC13892_REGULATORSETTING1_VAUDIOVSEL	4
 #define MC13892_REGULATORSETTING1_VSDVSEL	6

 #define MC13892_REGULATORSETTING1_VVIDEOVSEL_M	(3<<2)
 #define MC13892_REGULATORSETTING1_VAUDIOVSEL_M	(3<<4)
 #define MC13892_REGULATORSETTING1_VSDVSEL_M	(7<<6)

 #define MC13892_REGULATORMODE0			32
 #define MC13892_REGULATORMODE0_VGEN1EN		(1<<0)
 #define MC13892_REGULATORMODE0_VGEN1STDBY	(1<<1)
 #define MC13892_REGULATORMODE0_VGEN1MODE	(1<<2)
 #define MC13892_REGULATORMODE0_VIOHIEN		(1<<3)
 #define MC13892_REGULATORMODE0_VIOHISTDBY	(1<<4)
 #define MC13892_REGULATORMODE0_VIOHIMODE	(1<<5)
 #define MC13892_REGULATORMODE0_VDIGEN		(1<<9)
 #define MC13892_REGULATORMODE0_VDIGSTDBY	(1<<10)
 #define MC13892_REGULATORMODE0_VDIGMODE		(1<<11)
 #define MC13892_REGULATORMODE0_VGEN2EN		(1<<12)
 #define MC13892_REGULATORMODE0_VGEN2STDBY	(1<<13)
 #define MC13892_REGULATORMODE0_VGEN2MODE	(1<<14)
 #define MC13892_REGULATORMODE0_VPLLEN		(1<<15)
 #define MC13892_REGULATORMODE0_VPLLSTDBY	(1<<16)
 #define MC13892_REGULATORMODE0_VPLLMODE		(1<<17)
 #define MC13892_REGULATORMODE0_VUSB2EN		(1<<18)
 #define MC13892_REGULATORMODE0_VUSB2STDBY	(1<<19)
 #define MC13892_REGULATORMODE0_VUSB2MODE	(1<<20)

 #define MC13892_REGULATORMODE1			33
 #define MC13892_REGULATORMODE1_VGEN3EN		(1<<0)
 #define MC13892_REGULATORMODE1_VGEN3STDBY	(1<<1)
 #define MC13892_REGULATORMODE1_VGEN3MODE	(1<<2)
 #define MC13892_REGULATORMODE1_VCAMEN		(1<<6)
 #define MC13892_REGULATORMODE1_VCAMSTDBY	(1<<7)
 #define MC13892_REGULATORMODE1_VCAMMODE		(1<<8)
 #define MC13892_REGULATORMODE1_VCAMCONFIGEN	(1<<9)
 #define MC13892_REGULATORMODE1_VVIDEOEN		(1<<12)
 #define MC13892_REGULATORMODE1_VVIDEOSTDBY	(1<<13)
 #define MC13892_REGULATORMODE1_VVIDEOMODE	(1<<14)
 #define MC13892_REGULATORMODE1_VAUDIOEN		(1<<15)
 #define MC13892_REGULATORMODE1_VAUDIOSTDBY	(1<<16)
 #define MC13892_REGULATORMODE1_VAUDIOMODE	(1<<17)
 #define MC13892_REGULATORMODE1_VSDEN		(1<<18)
 #define MC13892_REGULATORMODE1_VSDSTDBY		(1<<19)
 #define MC13892_REGULATORMODE1_VSDMODE		(1<<20)

 #define MC13892_POWERMISC			34
 #define MC13892_POWERMISC_GPO1EN		(1<<6)
 #define MC13892_POWERMISC_GPO2EN		(1<<8)
 #define MC13892_POWERMISC_GPO3EN		(1<<10)
 #define MC13892_POWERMISC_GPO4EN		(1<<12)
 #define MC13892_POWERMISC_PWGT1SPIEN		(1<<15)
 #define MC13892_POWERMISC_PWGT2SPIEN		(1<<16)
 #define MC13892_POWERMISC_GPO4ADINEN		(1<<21)

 #define MC13892_POWERMISC_PWGTSPI_M		(3 << 15)

 #define MC13892_USB1				50
 #define MC13892_USB1_VUSBEN			(1<<3)

 static const unsigned int mc13892_vcoincell[] = {
 	2500000, 2700000, 2800000, 2900000, 3000000, 3100000,
 	3200000, 3300000,
 };

 static const unsigned int mc13892_sw1[] = {
 	600000,   625000,  650000,  675000,  700000,  725000,
 	750000,   775000,  800000,  825000,  850000,  875000,
 	900000,   925000,  950000,  975000, 1000000, 1025000,
 	1050000, 1075000, 1100000, 1125000, 1150000, 1175000,
 	1200000, 1225000, 1250000, 1275000, 1300000, 1325000,
 	1350000, 1375000
 };

 /*
  * Note: this table is used to derive SWxVSEL by index into
  * the array. Offset the values by the index of 1100000uV
  * to get the actual register value for that voltage selector
  * if the HI bit is to be set as well.
  */
 #define MC13892_SWxHI_SEL_OFFSET		20

 static const unsigned int mc13892_sw[] = {
 	600000,   625000,  650000,  675000,  700000,  725000,
 	750000,   775000,  800000,  825000,  850000,  875000,
 	900000,   925000,  950000,  975000, 1000000, 1025000,
 	1050000, 1075000, 1100000, 1125000, 1150000, 1175000,
 	1200000, 1225000, 1250000, 1275000, 1300000, 1325000,
 	1350000, 1375000, 1400000, 1425000, 1450000, 1475000,
 	1500000, 1525000, 1550000, 1575000, 1600000, 1625000,
 	1650000, 1675000, 1700000, 1725000, 1750000, 1775000,
 	1800000, 1825000, 1850000, 1875000
 };

 static const unsigned int mc13892_swbst[] = {
 	5000000,
 };

 static const unsigned int mc13892_viohi[] = {
 	2775000,
 };

 static const unsigned int mc13892_vpll[] = {
 	1050000, 1250000, 1650000, 1800000,
 };

 static const unsigned int mc13892_vdig[] = {
 	1050000, 1250000, 1650000, 1800000,
 };

 static const unsigned int mc13892_vsd[] = {
 	1800000, 2000000, 2600000, 2700000,
 	2800000, 2900000, 3000000, 3150000,
 };

 static const unsigned int mc13892_vusb2[] = {
 	2400000, 2600000, 2700000, 2775000,
 };

 static const unsigned int mc13892_vvideo[] = {
 	2700000, 2775000, 2500000, 2600000,
 };

 static const unsigned int mc13892_vaudio[] = {
 	2300000, 2500000, 2775000, 3000000,
 };

 static const unsigned int mc13892_vcam[] = {
 	2500000, 2600000, 2750000, 3000000,
 };

 static const unsigned int mc13892_vgen1[] = {
 	1200000, 1500000, 2775000, 3150000,
 };

 static const unsigned int mc13892_vgen2[] = {
 	1200000, 1500000, 1600000, 1800000,
 	2700000, 2800000, 3000000, 3150000,
 };

 static const unsigned int mc13892_vgen3[] = {
 	1800000, 2900000,
 };

 static const unsigned int mc13892_vusb[] = {
 	3300000,
 };

 static const unsigned int mc13892_gpo[] = {
 	2750000,
 };

 static const unsigned int mc13892_pwgtdrv[] = {
 	5000000,
 };

 static struct regulator_ops mc13892_gpo_regulator_ops;
 static struct regulator_ops mc13892_sw_regulator_ops;


 #define MC13892_FIXED_DEFINE(name, reg, voltages)		\
 	MC13xxx_FIXED_DEFINE(MC13892_, name, reg, voltages,	\
 			mc13xxx_fixed_regulator_ops)

 #define MC13892_GPO_DEFINE(name, reg, voltages)			\
 	MC13xxx_GPO_DEFINE(MC13892_, name, reg, voltages,	\
 			mc13892_gpo_regulator_ops)

 #define MC13892_SW_DEFINE(name, reg, vsel_reg, voltages)	\
 	MC13xxx_DEFINE(MC13892_, name, reg, vsel_reg, voltages, \
 			mc13892_sw_regulator_ops)

 #define MC13892_DEFINE_REGU(name, reg, vsel_reg, voltages)	\
 	MC13xxx_DEFINE(MC13892_, name, reg, vsel_reg, voltages, \
 			mc13xxx_regulator_ops)

 static struct mc13xxx_regulator mc13892_regulators[] = {
 	MC13892_DEFINE_REGU(VCOINCELL, POWERCTL0, POWERCTL0, mc13892_vcoincell),
 	MC13892_SW_DEFINE(SW1, SWITCHERS0, SWITCHERS0, mc13892_sw1),
 	MC13892_SW_DEFINE(SW2, SWITCHERS1, SWITCHERS1, mc13892_sw),
 	MC13892_SW_DEFINE(SW3, SWITCHERS2, SWITCHERS2, mc13892_sw),
 	MC13892_SW_DEFINE(SW4, SWITCHERS3, SWITCHERS3, mc13892_sw),
 	MC13892_FIXED_DEFINE(SWBST, SWITCHERS5, mc13892_swbst),
 	MC13892_FIXED_DEFINE(VIOHI, REGULATORMODE0, mc13892_viohi),
 	MC13892_DEFINE_REGU(VPLL, REGULATORMODE0, REGULATORSETTING0,
 		mc13892_vpll),
 	MC13892_DEFINE_REGU(VDIG, REGULATORMODE0, REGULATORSETTING0,
 		mc13892_vdig),
 	MC13892_DEFINE_REGU(VSD, REGULATORMODE1, REGULATORSETTING1,
 		mc13892_vsd),
 	MC13892_DEFINE_REGU(VUSB2, REGULATORMODE0, REGULATORSETTING0,
 		mc13892_vusb2),
 	MC13892_DEFINE_REGU(VVIDEO, REGULATORMODE1, REGULATORSETTING1,
 		mc13892_vvideo),
 	MC13892_DEFINE_REGU(VAUDIO, REGULATORMODE1, REGULATORSETTING1,
 		mc13892_vaudio),
 	MC13892_DEFINE_REGU(VCAM, REGULATORMODE1, REGULATORSETTING0,
 		mc13892_vcam),
 	MC13892_DEFINE_REGU(VGEN1, REGULATORMODE0, REGULATORSETTING0,
 		mc13892_vgen1),
 	MC13892_DEFINE_REGU(VGEN2, REGULATORMODE0, REGULATORSETTING0,
 		mc13892_vgen2),
 	MC13892_DEFINE_REGU(VGEN3, REGULATORMODE1, REGULATORSETTING0,
 		mc13892_vgen3),
 	MC13892_FIXED_DEFINE(VUSB, USB1, mc13892_vusb),
 	MC13892_GPO_DEFINE(GPO1, POWERMISC, mc13892_gpo),
 	MC13892_GPO_DEFINE(GPO2, POWERMISC, mc13892_gpo),
 	MC13892_GPO_DEFINE(GPO3, POWERMISC, mc13892_gpo),
 	MC13892_GPO_DEFINE(GPO4, POWERMISC, mc13892_gpo),
 	MC13892_GPO_DEFINE(PWGT1SPI, POWERMISC, mc13892_pwgtdrv),
 	MC13892_GPO_DEFINE(PWGT2SPI, POWERMISC, mc13892_pwgtdrv),
 };

 static int mc13892_powermisc_rmw(struct mc13xxx_regulator_priv *priv, u32 mask,
 				 u32 val)
 {
 	struct mc13xxx *mc13892 = priv->mc13xxx;
 	int ret;
 	u32 valread;

 	BUG_ON(val & ~mask);

 	mc13xxx_lock(priv->mc13xxx);
 	ret = mc13xxx_reg_read(mc13892, MC13892_POWERMISC, &valread);
 	if (ret)
 		goto out;

 	/* Update the stored state for Power Gates. */
 	priv->powermisc_pwgt_state =
 		(priv->powermisc_pwgt_state & ~mask) | val;
 	priv->powermisc_pwgt_state &= MC13892_POWERMISC_PWGTSPI_M;

 	/* Construct the new register value */
 	valread = (valread & ~mask) | val;
 	/* Overwrite the PWGTxEN with the stored version */
 	valread = (valread & ~MC13892_POWERMISC_PWGTSPI_M) |
 		priv->powermisc_pwgt_state;

 	ret = mc13xxx_reg_write(mc13892, MC13892_POWERMISC, valread);
 out:
 	mc13xxx_unlock(priv->mc13xxx);
 	return ret;
 }

 static int mc13892_gpo_regulator_enable(struct regulator_dev *rdev)
 {
 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 	int id = rdev_get_id(rdev);
 	u32 en_val = mc13892_regulators[id].enable_bit;
 	u32 mask = mc13892_regulators[id].enable_bit;

 	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

 	/* Power Gate enable value is 0 */
 	if (id == MC13892_PWGT1SPI || id == MC13892_PWGT2SPI)
 		en_val = 0;

 	if (id == MC13892_GPO4)
 		mask |= MC13892_POWERMISC_GPO4ADINEN;

 	return mc13892_powermisc_rmw(priv, mask, en_val);
 }

 static int mc13892_gpo_regulator_disable(struct regulator_dev *rdev)
 {
 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 	int id = rdev_get_id(rdev);
 	u32 dis_val = 0;

 	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

 	/* Power Gate disable value is 1 */
 	if (id == MC13892_PWGT1SPI || id == MC13892_PWGT2SPI)
 		dis_val = mc13892_regulators[id].enable_bit;

 	return mc13892_powermisc_rmw(priv, mc13892_regulators[id].enable_bit,
 		dis_val);
 }

 static int mc13892_gpo_regulator_is_enabled(struct regulator_dev *rdev)
 {
 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 	int ret, id = rdev_get_id(rdev);
 	unsigned int val;

 	mc13xxx_lock(priv->mc13xxx);
 	ret = mc13xxx_reg_read(priv->mc13xxx, mc13892_regulators[id].reg, &val);
 	mc13xxx_unlock(priv->mc13xxx);

 	if (ret)
 		return ret;

 	/* Power Gates state is stored in powermisc_pwgt_state
 	 * where the meaning of bits is negated */
 	val = (val & ~MC13892_POWERMISC_PWGTSPI_M) |
 		(priv->powermisc_pwgt_state ^ MC13892_POWERMISC_PWGTSPI_M);

 	return (val & mc13892_regulators[id].enable_bit) != 0;
 }


 static struct regulator_ops mc13892_gpo_regulator_ops = {
 	.enable = mc13892_gpo_regulator_enable,
 	.disable = mc13892_gpo_regulator_disable,
 	.is_enabled = mc13892_gpo_regulator_is_enabled,
 	.list_voltage = regulator_list_voltage_table,
 	.set_voltage = mc13xxx_fixed_regulator_set_voltage,
 };

 static int mc13892_sw_regulator_get_voltage_sel(struct regulator_dev *rdev)
 {
 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 	int ret, id = rdev_get_id(rdev);
 	unsigned int val, selector;

 	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

 	mc13xxx_lock(priv->mc13xxx);
 	ret = mc13xxx_reg_read(priv->mc13xxx,
 		mc13892_regulators[id].vsel_reg, &val);
 	mc13xxx_unlock(priv->mc13xxx);
 	if (ret)
 		return ret;

 	/*
 	 * Figure out if the HI bit is set inside the switcher mode register
 	 * since this means the selector value we return is at a different
 	 * offset into the selector table.
 	 *
 	 * According to the MC13892 documentation note 59 (Table 47) the SW1
 	 * buck switcher does not support output range programming therefore
 	 * the HI bit must always remain 0. So do not do anything strange if
 	 * our register is MC13892_SWITCHERS0.
 	 */

 	selector = val & mc13892_regulators[id].vsel_mask;

 	if ((mc13892_regulators[id].vsel_reg != MC13892_SWITCHERS0) &&
 	    (val & MC13892_SWITCHERS0_SWxHI)) {
 		selector += MC13892_SWxHI_SEL_OFFSET;
 	}

 	dev_dbg(rdev_get_dev(rdev), "%s id: %d val: 0x%08x selector: %d\n",
 			__func__, id, val, selector);

 	return selector;
 }

 static int mc13892_sw_regulator_set_voltage_sel(struct regulator_dev *rdev,
 						unsigned selector)
 {
 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 	int volt, mask, id = rdev_get_id(rdev);
 	u32 reg_value;
 	int ret;

 	volt = rdev->desc->volt_table[selector];
 	mask = mc13892_regulators[id].vsel_mask;
 	reg_value = selector;

 	/*
 	 * Don't mess with the HI bit or support HI voltage offsets for SW1.
 	 *
 	 * Since the get_voltage_sel callback has given a fudged value for
 	 * the selector offset, we need to back out that offset if HI is
 	 * to be set so we write the correct value to the register.
 	 *
 	 * The HI bit addition and selector offset handling COULD be more
 	 * complicated by shifting and masking off the voltage selector part
 	 * of the register then logical OR it back in, but since the selector
 	 * is at bits 4:0 there is very little point. This makes the whole
 	 * thing more readable and we do far less work.
 	 */

 	if (mc13892_regulators[id].vsel_reg != MC13892_SWITCHERS0) {
 		mask |= MC13892_SWITCHERS0_SWxHI;

 		if (volt > 1375000) {
 			reg_value -= MC13892_SWxHI_SEL_OFFSET;
 			reg_value |= MC13892_SWITCHERS0_SWxHI;
 		} else {
 			reg_value &= ~MC13892_SWITCHERS0_SWxHI;
 		}
 	}

 	mc13xxx_lock(priv->mc13xxx);
 	ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13892_regulators[id].vsel_reg,
 			      mask, reg_value);
 	mc13xxx_unlock(priv->mc13xxx);

 	return ret;
 }

 static struct regulator_ops mc13892_sw_regulator_ops = {
 	.list_voltage = regulator_list_voltage_table,
 	.map_voltage = regulator_map_voltage_ascend,
 	.set_voltage_sel = mc13892_sw_regulator_set_voltage_sel,
 	.get_voltage_sel = mc13892_sw_regulator_get_voltage_sel,
 };

 static int mc13892_vcam_set_mode(struct regulator_dev *rdev, unsigned int mode)
 {
 	unsigned int en_val = 0;
 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 	int ret, id = rdev_get_id(rdev);

 	if (mode == REGULATOR_MODE_FAST)
 		en_val = MC13892_REGULATORMODE1_VCAMCONFIGEN;

 	mc13xxx_lock(priv->mc13xxx);
 	ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13892_regulators[id].reg,
 		MC13892_REGULATORMODE1_VCAMCONFIGEN, en_val);
 	mc13xxx_unlock(priv->mc13xxx);

 	return ret;
 }

 static unsigned int mc13892_vcam_get_mode(struct regulator_dev *rdev)
 {
 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 	int ret, id = rdev_get_id(rdev);
 	unsigned int val;

 	mc13xxx_lock(priv->mc13xxx);
 	ret = mc13xxx_reg_read(priv->mc13xxx, mc13892_regulators[id].reg, &val);
 	mc13xxx_unlock(priv->mc13xxx);

 	if (ret)
 		return ret;

 	if (val & MC13892_REGULATORMODE1_VCAMCONFIGEN)
 		return REGULATOR_MODE_FAST;

 	return REGULATOR_MODE_NORMAL;
 }

 static struct regulator_ops mc13892_vcam_ops;

 static int mc13892_regulator_probe(struct platform_device *pdev)
 {
 	struct mc13xxx_regulator_priv *priv;
 	struct mc13xxx *mc13892 = dev_get_drvdata(pdev->dev.parent);
 	struct mc13xxx_regulator_platform_data *pdata =
 		dev_get_platdata(&pdev->dev);
 	struct mc13xxx_regulator_init_data *mc13xxx_data;
 	struct regulator_config config = { };
 	int i, ret;
 	int num_regulators = 0;
 	u32 val;

 	num_regulators = mc13xxx_get_num_regulators_dt(pdev);

 	if (num_regulators <= 0 && pdata)
 		num_regulators = pdata->num_regulators;
 	if (num_regulators <= 0)
 		return -EINVAL;

 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv) +
 		num_regulators * sizeof(priv->regulators[0]),
 		GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	priv->num_regulators = num_regulators;
 	priv->mc13xxx_regulators = mc13892_regulators;
 	priv->mc13xxx = mc13892;
 	platform_set_drvdata(pdev, priv);

 	mc13xxx_lock(mc13892);
 	ret = mc13xxx_reg_read(mc13892, MC13892_REVISION, &val);
 	if (ret)
 		goto err_unlock;

 	/* enable switch auto mode (on 2.0A silicon only) */
 	if ((val & 0x0000FFFF) == 0x45d0) {
 		ret = mc13xxx_reg_rmw(mc13892, MC13892_SWITCHERS4,
 			MC13892_SWITCHERS4_SW1MODE_M |
 			MC13892_SWITCHERS4_SW2MODE_M,
 			MC13892_SWITCHERS4_SW1MODE_AUTO |
 			MC13892_SWITCHERS4_SW2MODE_AUTO);
 		if (ret)
 			goto err_unlock;

 		ret = mc13xxx_reg_rmw(mc13892, MC13892_SWITCHERS5,
 			MC13892_SWITCHERS5_SW3MODE_M |
 			MC13892_SWITCHERS5_SW4MODE_M,
 			MC13892_SWITCHERS5_SW3MODE_AUTO |
 			MC13892_SWITCHERS5_SW4MODE_AUTO);
 		if (ret)
 			goto err_unlock;
 	}
 	mc13xxx_unlock(mc13892);

 	/* update mc13892_vcam ops */
 	memcpy(&mc13892_vcam_ops, mc13892_regulators[MC13892_VCAM].desc.ops,
 						sizeof(struct regulator_ops));
 	mc13892_vcam_ops.set_mode = mc13892_vcam_set_mode,
 	mc13892_vcam_ops.get_mode = mc13892_vcam_get_mode,
 	mc13892_regulators[MC13892_VCAM].desc.ops = &mc13892_vcam_ops;

 	mc13xxx_data = mc13xxx_parse_regulators_dt(pdev, mc13892_regulators,
 					ARRAY_SIZE(mc13892_regulators));

 	for (i = 0; i < priv->num_regulators; i++) {
 		struct regulator_init_data *init_data;
 		struct regulator_desc *desc;
 		struct device_node *node = NULL;
 		int id;

 		if (mc13xxx_data) {
 			id = mc13xxx_data[i].id;
 			init_data = mc13xxx_data[i].init_data;
 			node = mc13xxx_data[i].node;
 		} else {
 			id = pdata->regulators[i].id;
 			init_data = pdata->regulators[i].init_data;
 		}
 		desc = &mc13892_regulators[id].desc;

 		config.dev = &pdev->dev;
 		config.init_data = init_data;
 		config.driver_data = priv;
 		config.of_node = node;

 		priv->regulators[i] = devm_regulator_register(&pdev->dev, desc,
 							      &config);
 		if (IS_ERR(priv->regulators[i])) {
 			dev_err(&pdev->dev, "failed to register regulator %s\n",
 				mc13892_regulators[i].desc.name);
 			return PTR_ERR(priv->regulators[i]);
 		}
 	}

 	return 0;

 err_unlock:
 	mc13xxx_unlock(mc13892);
 	return ret;
 }

 static struct platform_driver mc13892_regulator_driver = {
 	.driver	= {
 		.name	= "mc13892-regulator",
 	},
 	.probe	= mc13892_regulator_probe,
 };

 static int __init mc13892_regulator_init(void)
 {
 	return platform_driver_register(&mc13892_regulator_driver);
 }
 subsys_initcall(mc13892_regulator_init);

 static void __exit mc13892_regulator_exit(void)
 {
 	platform_driver_unregister(&mc13892_regulator_driver);
 }
 module_exit(mc13892_regulator_exit);

 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
 MODULE_DESCRIPTION("Regulator Driver for Freescale MC13892 PMIC");
 MODULE_ALIAS("platform:mc13892-regulator");
	/*
	* Regulator Driver for Freescale MC13892 PMIC
	*
	* Copyright 2010 Yong Shen <yong.shen@linaro.org>
	*
	* Based on draft driver from Arnaud Patard <arnaud.patard@rtp-net.org>
	*
	* 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/mfd/mc13892.h>
	#include <linux/regulator/machine.h>
	#include <linux/regulator/driver.h>
	#include <linux/platform_device.h>
	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/init.h>
	#include <linux/err.h>
	#include <linux/module.h>
	#include "mc13xxx.h"

	#define MC13892_REVISION 7

	#define MC13892_POWERCTL0 13
	#define MC13892_POWERCTL0_USEROFFSPI 3
	#define MC13892_POWERCTL0_VCOINCELLVSEL 20
	#define MC13892_POWERCTL0_VCOINCELLVSEL_M (7<<20)
	#define MC13892_POWERCTL0_VCOINCELLEN (1<<23)

	#define MC13892_SWITCHERS0_SWxHI (1<<23)

	#define MC13892_SWITCHERS0 24
	#define MC13892_SWITCHERS0_SW1VSEL 0
	#define MC13892_SWITCHERS0_SW1VSEL_M (0x1f<<0)
	#define MC13892_SWITCHERS0_SW1HI (1<<23)
	#define MC13892_SWITCHERS0_SW1EN 0

	#define MC13892_SWITCHERS1 25
	#define MC13892_SWITCHERS1_SW2VSEL 0
	#define MC13892_SWITCHERS1_SW2VSEL_M (0x1f<<0)
	#define MC13892_SWITCHERS1_SW2HI (1<<23)
	#define MC13892_SWITCHERS1_SW2EN 0

	#define MC13892_SWITCHERS2 26
	#define MC13892_SWITCHERS2_SW3VSEL 0
	#define MC13892_SWITCHERS2_SW3VSEL_M (0x1f<<0)
	#define MC13892_SWITCHERS2_SW3HI (1<<23)
	#define MC13892_SWITCHERS2_SW3EN 0

	#define MC13892_SWITCHERS3 27
	#define MC13892_SWITCHERS3_SW4VSEL 0
	#define MC13892_SWITCHERS3_SW4VSEL_M (0x1f<<0)
	#define MC13892_SWITCHERS3_SW4HI (1<<23)
	#define MC13892_SWITCHERS3_SW4EN 0

	#define MC13892_SWITCHERS4 28
	#define MC13892_SWITCHERS4_SW1MODE 0
	#define MC13892_SWITCHERS4_SW1MODE_AUTO (8<<0)
	#define MC13892_SWITCHERS4_SW1MODE_M (0xf<<0)
	#define MC13892_SWITCHERS4_SW2MODE 10
	#define MC13892_SWITCHERS4_SW2MODE_AUTO (8<<10)
	#define MC13892_SWITCHERS4_SW2MODE_M (0xf<<10)

	#define MC13892_SWITCHERS5 29
	#define MC13892_SWITCHERS5_SW3MODE 0
	#define MC13892_SWITCHERS5_SW3MODE_AUTO (8<<0)
	#define MC13892_SWITCHERS5_SW3MODE_M (0xf<<0)
	#define MC13892_SWITCHERS5_SW4MODE 8
	#define MC13892_SWITCHERS5_SW4MODE_AUTO (8<<8)
	#define MC13892_SWITCHERS5_SW4MODE_M (0xf<<8)
	#define MC13892_SWITCHERS5_SWBSTEN (1<<20)

	#define MC13892_REGULATORSETTING0 30
	#define MC13892_REGULATORSETTING0_VGEN1VSEL 0
	#define MC13892_REGULATORSETTING0_VDIGVSEL 4
	#define MC13892_REGULATORSETTING0_VGEN2VSEL 6
	#define MC13892_REGULATORSETTING0_VPLLVSEL 9
	#define MC13892_REGULATORSETTING0_VUSB2VSEL 11
	#define MC13892_REGULATORSETTING0_VGEN3VSEL 14
	#define MC13892_REGULATORSETTING0_VCAMVSEL 16

	#define MC13892_REGULATORSETTING0_VGEN1VSEL_M (3<<0)
	#define MC13892_REGULATORSETTING0_VDIGVSEL_M (3<<4)
	#define MC13892_REGULATORSETTING0_VGEN2VSEL_M (7<<6)
	#define MC13892_REGULATORSETTING0_VPLLVSEL_M (3<<9)
	#define MC13892_REGULATORSETTING0_VUSB2VSEL_M (3<<11)
	#define MC13892_REGULATORSETTING0_VGEN3VSEL_M (1<<14)
	#define MC13892_REGULATORSETTING0_VCAMVSEL_M (3<<16)

	#define MC13892_REGULATORSETTING1 31
	#define MC13892_REGULATORSETTING1_VVIDEOVSEL 2
	#define MC13892_REGULATORSETTING1_VAUDIOVSEL 4
	#define MC13892_REGULATORSETTING1_VSDVSEL 6

	#define MC13892_REGULATORSETTING1_VVIDEOVSEL_M (3<<2)
	#define MC13892_REGULATORSETTING1_VAUDIOVSEL_M (3<<4)
	#define MC13892_REGULATORSETTING1_VSDVSEL_M (7<<6)

	#define MC13892_REGULATORMODE0 32
	#define MC13892_REGULATORMODE0_VGEN1EN (1<<0)
	#define MC13892_REGULATORMODE0_VGEN1STDBY (1<<1)
	#define MC13892_REGULATORMODE0_VGEN1MODE (1<<2)
	#define MC13892_REGULATORMODE0_VIOHIEN (1<<3)
	#define MC13892_REGULATORMODE0_VIOHISTDBY (1<<4)
	#define MC13892_REGULATORMODE0_VIOHIMODE (1<<5)
	#define MC13892_REGULATORMODE0_VDIGEN (1<<9)
	#define MC13892_REGULATORMODE0_VDIGSTDBY (1<<10)
	#define MC13892_REGULATORMODE0_VDIGMODE (1<<11)
	#define MC13892_REGULATORMODE0_VGEN2EN (1<<12)
	#define MC13892_REGULATORMODE0_VGEN2STDBY (1<<13)
	#define MC13892_REGULATORMODE0_VGEN2MODE (1<<14)
	#define MC13892_REGULATORMODE0_VPLLEN (1<<15)
	#define MC13892_REGULATORMODE0_VPLLSTDBY (1<<16)
	#define MC13892_REGULATORMODE0_VPLLMODE (1<<17)
	#define MC13892_REGULATORMODE0_VUSB2EN (1<<18)
	#define MC13892_REGULATORMODE0_VUSB2STDBY (1<<19)
	#define MC13892_REGULATORMODE0_VUSB2MODE (1<<20)

	#define MC13892_REGULATORMODE1 33
	#define MC13892_REGULATORMODE1_VGEN3EN (1<<0)
	#define MC13892_REGULATORMODE1_VGEN3STDBY (1<<1)
	#define MC13892_REGULATORMODE1_VGEN3MODE (1<<2)
	#define MC13892_REGULATORMODE1_VCAMEN (1<<6)
	#define MC13892_REGULATORMODE1_VCAMSTDBY (1<<7)
	#define MC13892_REGULATORMODE1_VCAMMODE (1<<8)
	#define MC13892_REGULATORMODE1_VCAMCONFIGEN (1<<9)
	#define MC13892_REGULATORMODE1_VVIDEOEN (1<<12)
	#define MC13892_REGULATORMODE1_VVIDEOSTDBY (1<<13)
	#define MC13892_REGULATORMODE1_VVIDEOMODE (1<<14)
	#define MC13892_REGULATORMODE1_VAUDIOEN (1<<15)
	#define MC13892_REGULATORMODE1_VAUDIOSTDBY (1<<16)
	#define MC13892_REGULATORMODE1_VAUDIOMODE (1<<17)
	#define MC13892_REGULATORMODE1_VSDEN (1<<18)
	#define MC13892_REGULATORMODE1_VSDSTDBY (1<<19)
	#define MC13892_REGULATORMODE1_VSDMODE (1<<20)

	#define MC13892_POWERMISC 34
	#define MC13892_POWERMISC_GPO1EN (1<<6)
	#define MC13892_POWERMISC_GPO2EN (1<<8)
	#define MC13892_POWERMISC_GPO3EN (1<<10)
	#define MC13892_POWERMISC_GPO4EN (1<<12)
	#define MC13892_POWERMISC_PWGT1SPIEN (1<<15)
	#define MC13892_POWERMISC_PWGT2SPIEN (1<<16)
	#define MC13892_POWERMISC_GPO4ADINEN (1<<21)

	#define MC13892_POWERMISC_PWGTSPI_M (3 << 15)

	#define MC13892_USB1 50
	#define MC13892_USB1_VUSBEN (1<<3)

	static const unsigned int mc13892_vcoincell[] = {
	2500000, 2700000, 2800000, 2900000, 3000000, 3100000,
	3200000, 3300000,
	};

	static const unsigned int mc13892_sw1[] = {
	600000, 625000, 650000, 675000, 700000, 725000,
	750000, 775000, 800000, 825000, 850000, 875000,
	900000, 925000, 950000, 975000, 1000000, 1025000,
	1050000, 1075000, 1100000, 1125000, 1150000, 1175000,
	1200000, 1225000, 1250000, 1275000, 1300000, 1325000,
	1350000, 1375000
	};

	/*
	* Note: this table is used to derive SWxVSEL by index into
	* the array. Offset the values by the index of 1100000uV
	* to get the actual register value for that voltage selector
	* if the HI bit is to be set as well.
	*/
	#define MC13892_SWxHI_SEL_OFFSET 20

	static const unsigned int mc13892_sw[] = {
	600000, 625000, 650000, 675000, 700000, 725000,
	750000, 775000, 800000, 825000, 850000, 875000,
	900000, 925000, 950000, 975000, 1000000, 1025000,
	1050000, 1075000, 1100000, 1125000, 1150000, 1175000,
	1200000, 1225000, 1250000, 1275000, 1300000, 1325000,
	1350000, 1375000, 1400000, 1425000, 1450000, 1475000,
	1500000, 1525000, 1550000, 1575000, 1600000, 1625000,
	1650000, 1675000, 1700000, 1725000, 1750000, 1775000,
	1800000, 1825000, 1850000, 1875000
	};

	static const unsigned int mc13892_swbst[] = {
	5000000,
	};

	static const unsigned int mc13892_viohi[] = {
	2775000,
	};

	static const unsigned int mc13892_vpll[] = {
	1050000, 1250000, 1650000, 1800000,
	};

	static const unsigned int mc13892_vdig[] = {
	1050000, 1250000, 1650000, 1800000,
	};

	static const unsigned int mc13892_vsd[] = {
	1800000, 2000000, 2600000, 2700000,
	2800000, 2900000, 3000000, 3150000,
	};

	static const unsigned int mc13892_vusb2[] = {
	2400000, 2600000, 2700000, 2775000,
	};

	static const unsigned int mc13892_vvideo[] = {
	2700000, 2775000, 2500000, 2600000,
	};

	static const unsigned int mc13892_vaudio[] = {
	2300000, 2500000, 2775000, 3000000,
	};

	static const unsigned int mc13892_vcam[] = {
	2500000, 2600000, 2750000, 3000000,
	};

	static const unsigned int mc13892_vgen1[] = {
	1200000, 1500000, 2775000, 3150000,
	};

	static const unsigned int mc13892_vgen2[] = {
	1200000, 1500000, 1600000, 1800000,
	2700000, 2800000, 3000000, 3150000,
	};

	static const unsigned int mc13892_vgen3[] = {
	1800000, 2900000,
	};

	static const unsigned int mc13892_vusb[] = {
	3300000,
	};

	static const unsigned int mc13892_gpo[] = {
	2750000,
	};

	static const unsigned int mc13892_pwgtdrv[] = {
	5000000,
	};

	static struct regulator_ops mc13892_gpo_regulator_ops;
	static struct regulator_ops mc13892_sw_regulator_ops;


	#define MC13892_FIXED_DEFINE(name, reg, voltages) \
	MC13xxx_FIXED_DEFINE(MC13892_, name, reg, voltages, \
	mc13xxx_fixed_regulator_ops)

	#define MC13892_GPO_DEFINE(name, reg, voltages) \
	MC13xxx_GPO_DEFINE(MC13892_, name, reg, voltages, \
	mc13892_gpo_regulator_ops)

	#define MC13892_SW_DEFINE(name, reg, vsel_reg, voltages) \
	MC13xxx_DEFINE(MC13892_, name, reg, vsel_reg, voltages, \
	mc13892_sw_regulator_ops)

	#define MC13892_DEFINE_REGU(name, reg, vsel_reg, voltages) \
	MC13xxx_DEFINE(MC13892_, name, reg, vsel_reg, voltages, \
	mc13xxx_regulator_ops)

	static struct mc13xxx_regulator mc13892_regulators[] = {
	MC13892_DEFINE_REGU(VCOINCELL, POWERCTL0, POWERCTL0, mc13892_vcoincell),
	MC13892_SW_DEFINE(SW1, SWITCHERS0, SWITCHERS0, mc13892_sw1),
	MC13892_SW_DEFINE(SW2, SWITCHERS1, SWITCHERS1, mc13892_sw),
	MC13892_SW_DEFINE(SW3, SWITCHERS2, SWITCHERS2, mc13892_sw),
	MC13892_SW_DEFINE(SW4, SWITCHERS3, SWITCHERS3, mc13892_sw),
	MC13892_FIXED_DEFINE(SWBST, SWITCHERS5, mc13892_swbst),
	MC13892_FIXED_DEFINE(VIOHI, REGULATORMODE0, mc13892_viohi),
	MC13892_DEFINE_REGU(VPLL, REGULATORMODE0, REGULATORSETTING0,
	mc13892_vpll),
	MC13892_DEFINE_REGU(VDIG, REGULATORMODE0, REGULATORSETTING0,
	mc13892_vdig),
	MC13892_DEFINE_REGU(VSD, REGULATORMODE1, REGULATORSETTING1,
	mc13892_vsd),
	MC13892_DEFINE_REGU(VUSB2, REGULATORMODE0, REGULATORSETTING0,
	mc13892_vusb2),
	MC13892_DEFINE_REGU(VVIDEO, REGULATORMODE1, REGULATORSETTING1,
	mc13892_vvideo),
	MC13892_DEFINE_REGU(VAUDIO, REGULATORMODE1, REGULATORSETTING1,
	mc13892_vaudio),
	MC13892_DEFINE_REGU(VCAM, REGULATORMODE1, REGULATORSETTING0,
	mc13892_vcam),
	MC13892_DEFINE_REGU(VGEN1, REGULATORMODE0, REGULATORSETTING0,
	mc13892_vgen1),
	MC13892_DEFINE_REGU(VGEN2, REGULATORMODE0, REGULATORSETTING0,
	mc13892_vgen2),
	MC13892_DEFINE_REGU(VGEN3, REGULATORMODE1, REGULATORSETTING0,
	mc13892_vgen3),
	MC13892_FIXED_DEFINE(VUSB, USB1, mc13892_vusb),
	MC13892_GPO_DEFINE(GPO1, POWERMISC, mc13892_gpo),
	MC13892_GPO_DEFINE(GPO2, POWERMISC, mc13892_gpo),
	MC13892_GPO_DEFINE(GPO3, POWERMISC, mc13892_gpo),
	MC13892_GPO_DEFINE(GPO4, POWERMISC, mc13892_gpo),
	MC13892_GPO_DEFINE(PWGT1SPI, POWERMISC, mc13892_pwgtdrv),
	MC13892_GPO_DEFINE(PWGT2SPI, POWERMISC, mc13892_pwgtdrv),
	};

	static int mc13892_powermisc_rmw(struct mc13xxx_regulator_priv *priv, u32 mask,
	u32 val)
	{
	struct mc13xxx *mc13892 = priv->mc13xxx;
	int ret;
	u32 valread;

	BUG_ON(val & ~mask);

	mc13xxx_lock(priv->mc13xxx);
	ret = mc13xxx_reg_read(mc13892, MC13892_POWERMISC, &valread);
	if (ret)
	goto out;

	/* Update the stored state for Power Gates. */
	priv->powermisc_pwgt_state =
	(priv->powermisc_pwgt_state & ~mask) \| val;
	priv->powermisc_pwgt_state &= MC13892_POWERMISC_PWGTSPI_M;

	/* Construct the new register value */
	valread = (valread & ~mask) \| val;
	/* Overwrite the PWGTxEN with the stored version */
	valread = (valread & ~MC13892_POWERMISC_PWGTSPI_M) \|
	priv->powermisc_pwgt_state;

	ret = mc13xxx_reg_write(mc13892, MC13892_POWERMISC, valread);
	out:
	mc13xxx_unlock(priv->mc13xxx);
	return ret;
	}

	static int mc13892_gpo_regulator_enable(struct regulator_dev *rdev)
	{
	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	int id = rdev_get_id(rdev);
	u32 en_val = mc13892_regulators[id].enable_bit;
	u32 mask = mc13892_regulators[id].enable_bit;

	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

	/* Power Gate enable value is 0 */
	if (id == MC13892_PWGT1SPI \|\| id == MC13892_PWGT2SPI)
	en_val = 0;

	if (id == MC13892_GPO4)
	mask \|= MC13892_POWERMISC_GPO4ADINEN;

	return mc13892_powermisc_rmw(priv, mask, en_val);
	}

	static int mc13892_gpo_regulator_disable(struct regulator_dev *rdev)
	{
	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	int id = rdev_get_id(rdev);
	u32 dis_val = 0;

	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

	/* Power Gate disable value is 1 */
	if (id == MC13892_PWGT1SPI \|\| id == MC13892_PWGT2SPI)
	dis_val = mc13892_regulators[id].enable_bit;

	return mc13892_powermisc_rmw(priv, mc13892_regulators[id].enable_bit,
	dis_val);
	}

	static int mc13892_gpo_regulator_is_enabled(struct regulator_dev *rdev)
	{
	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	int ret, id = rdev_get_id(rdev);
	unsigned int val;

	mc13xxx_lock(priv->mc13xxx);
	ret = mc13xxx_reg_read(priv->mc13xxx, mc13892_regulators[id].reg, &val);
	mc13xxx_unlock(priv->mc13xxx);

	if (ret)
	return ret;

	/* Power Gates state is stored in powermisc_pwgt_state
	* where the meaning of bits is negated */
	val = (val & ~MC13892_POWERMISC_PWGTSPI_M) \|
	(priv->powermisc_pwgt_state ^ MC13892_POWERMISC_PWGTSPI_M);

	return (val & mc13892_regulators[id].enable_bit) != 0;
	}


	static struct regulator_ops mc13892_gpo_regulator_ops = {
	.enable = mc13892_gpo_regulator_enable,
	.disable = mc13892_gpo_regulator_disable,
	.is_enabled = mc13892_gpo_regulator_is_enabled,
	.list_voltage = regulator_list_voltage_table,
	.set_voltage = mc13xxx_fixed_regulator_set_voltage,
	};

	static int mc13892_sw_regulator_get_voltage_sel(struct regulator_dev *rdev)
	{
	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	int ret, id = rdev_get_id(rdev);
	unsigned int val, selector;

	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

	mc13xxx_lock(priv->mc13xxx);
	ret = mc13xxx_reg_read(priv->mc13xxx,
	mc13892_regulators[id].vsel_reg, &val);
	mc13xxx_unlock(priv->mc13xxx);
	if (ret)
	return ret;

	/*
	* Figure out if the HI bit is set inside the switcher mode register
	* since this means the selector value we return is at a different
	* offset into the selector table.
	*
	* According to the MC13892 documentation note 59 (Table 47) the SW1
	* buck switcher does not support output range programming therefore
	* the HI bit must always remain 0. So do not do anything strange if
	* our register is MC13892_SWITCHERS0.
	*/

	selector = val & mc13892_regulators[id].vsel_mask;

	if ((mc13892_regulators[id].vsel_reg != MC13892_SWITCHERS0) &&
	(val & MC13892_SWITCHERS0_SWxHI)) {
	selector += MC13892_SWxHI_SEL_OFFSET;
	}

	dev_dbg(rdev_get_dev(rdev), "%s id: %d val: 0x%08x selector: %d\n",
	__func__, id, val, selector);

	return selector;
	}

	static int mc13892_sw_regulator_set_voltage_sel(struct regulator_dev *rdev,
	unsigned selector)
	{
	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	int volt, mask, id = rdev_get_id(rdev);
	u32 reg_value;
	int ret;

	volt = rdev->desc->volt_table[selector];
	mask = mc13892_regulators[id].vsel_mask;
	reg_value = selector;

	/*
	* Don't mess with the HI bit or support HI voltage offsets for SW1.
	*
	* Since the get_voltage_sel callback has given a fudged value for
	* the selector offset, we need to back out that offset if HI is
	* to be set so we write the correct value to the register.
	*
	* The HI bit addition and selector offset handling COULD be more
	* complicated by shifting and masking off the voltage selector part
	* of the register then logical OR it back in, but since the selector
	* is at bits 4:0 there is very little point. This makes the whole
	* thing more readable and we do far less work.
	*/

	if (mc13892_regulators[id].vsel_reg != MC13892_SWITCHERS0) {
	mask \|= MC13892_SWITCHERS0_SWxHI;

	if (volt > 1375000) {
	reg_value -= MC13892_SWxHI_SEL_OFFSET;
	reg_value \|= MC13892_SWITCHERS0_SWxHI;
	} else {
	reg_value &= ~MC13892_SWITCHERS0_SWxHI;
	}
	}

	mc13xxx_lock(priv->mc13xxx);
	ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13892_regulators[id].vsel_reg,
	mask, reg_value);
	mc13xxx_unlock(priv->mc13xxx);

	return ret;
	}

	static struct regulator_ops mc13892_sw_regulator_ops = {
	.list_voltage = regulator_list_voltage_table,
	.map_voltage = regulator_map_voltage_ascend,
	.set_voltage_sel = mc13892_sw_regulator_set_voltage_sel,
	.get_voltage_sel = mc13892_sw_regulator_get_voltage_sel,
	};

	static int mc13892_vcam_set_mode(struct regulator_dev *rdev, unsigned int mode)
	{
	unsigned int en_val = 0;
	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	int ret, id = rdev_get_id(rdev);

	if (mode == REGULATOR_MODE_FAST)
	en_val = MC13892_REGULATORMODE1_VCAMCONFIGEN;

	mc13xxx_lock(priv->mc13xxx);
	ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13892_regulators[id].reg,
	MC13892_REGULATORMODE1_VCAMCONFIGEN, en_val);
	mc13xxx_unlock(priv->mc13xxx);

	return ret;
	}

	static unsigned int mc13892_vcam_get_mode(struct regulator_dev *rdev)
	{
	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	int ret, id = rdev_get_id(rdev);
	unsigned int val;

	mc13xxx_lock(priv->mc13xxx);
	ret = mc13xxx_reg_read(priv->mc13xxx, mc13892_regulators[id].reg, &val);
	mc13xxx_unlock(priv->mc13xxx);

	if (ret)
	return ret;

	if (val & MC13892_REGULATORMODE1_VCAMCONFIGEN)
	return REGULATOR_MODE_FAST;

	return REGULATOR_MODE_NORMAL;
	}

	static struct regulator_ops mc13892_vcam_ops;

	static int mc13892_regulator_probe(struct platform_device *pdev)
	{
	struct mc13xxx_regulator_priv *priv;
	struct mc13xxx *mc13892 = dev_get_drvdata(pdev->dev.parent);
	struct mc13xxx_regulator_platform_data *pdata =
	dev_get_platdata(&pdev->dev);
	struct mc13xxx_regulator_init_data *mc13xxx_data;
	struct regulator_config config = { };
	int i, ret;
	int num_regulators = 0;
	u32 val;

	num_regulators = mc13xxx_get_num_regulators_dt(pdev);

	if (num_regulators <= 0 && pdata)
	num_regulators = pdata->num_regulators;
	if (num_regulators <= 0)
	return -EINVAL;

	priv = devm_kzalloc(&pdev->dev, sizeof(*priv) +
	num_regulators * sizeof(priv->regulators[0]),
	GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	priv->num_regulators = num_regulators;
	priv->mc13xxx_regulators = mc13892_regulators;
	priv->mc13xxx = mc13892;
	platform_set_drvdata(pdev, priv);

	mc13xxx_lock(mc13892);
	ret = mc13xxx_reg_read(mc13892, MC13892_REVISION, &val);
	if (ret)
	goto err_unlock;

	/* enable switch auto mode (on 2.0A silicon only) */
	if ((val & 0x0000FFFF) == 0x45d0) {
	ret = mc13xxx_reg_rmw(mc13892, MC13892_SWITCHERS4,
	MC13892_SWITCHERS4_SW1MODE_M \|
	MC13892_SWITCHERS4_SW2MODE_M,
	MC13892_SWITCHERS4_SW1MODE_AUTO \|
	MC13892_SWITCHERS4_SW2MODE_AUTO);
	if (ret)
	goto err_unlock;

	ret = mc13xxx_reg_rmw(mc13892, MC13892_SWITCHERS5,
	MC13892_SWITCHERS5_SW3MODE_M \|
	MC13892_SWITCHERS5_SW4MODE_M,
	MC13892_SWITCHERS5_SW3MODE_AUTO \|
	MC13892_SWITCHERS5_SW4MODE_AUTO);
	if (ret)
	goto err_unlock;
	}
	mc13xxx_unlock(mc13892);

	/* update mc13892_vcam ops */
	memcpy(&mc13892_vcam_ops, mc13892_regulators[MC13892_VCAM].desc.ops,
	sizeof(struct regulator_ops));
	mc13892_vcam_ops.set_mode = mc13892_vcam_set_mode,
	mc13892_vcam_ops.get_mode = mc13892_vcam_get_mode,
	mc13892_regulators[MC13892_VCAM].desc.ops = &mc13892_vcam_ops;

	mc13xxx_data = mc13xxx_parse_regulators_dt(pdev, mc13892_regulators,
	ARRAY_SIZE(mc13892_regulators));

	for (i = 0; i < priv->num_regulators; i++) {
	struct regulator_init_data *init_data;
	struct regulator_desc *desc;
	struct device_node *node = NULL;
	int id;

	if (mc13xxx_data) {
	id = mc13xxx_data[i].id;
	init_data = mc13xxx_data[i].init_data;
	node = mc13xxx_data[i].node;
	} else {
	id = pdata->regulators[i].id;
	init_data = pdata->regulators[i].init_data;
	}
	desc = &mc13892_regulators[id].desc;

	config.dev = &pdev->dev;
	config.init_data = init_data;
	config.driver_data = priv;
	config.of_node = node;

	priv->regulators[i] = devm_regulator_register(&pdev->dev, desc,
	&config);
	if (IS_ERR(priv->regulators[i])) {
	dev_err(&pdev->dev, "failed to register regulator %s\n",
	mc13892_regulators[i].desc.name);
	return PTR_ERR(priv->regulators[i]);
	}
	}

	return 0;

	err_unlock:
	mc13xxx_unlock(mc13892);
	return ret;
	}

	static struct platform_driver mc13892_regulator_driver = {
	.driver = {
	.name = "mc13892-regulator",
	},
	.probe = mc13892_regulator_probe,
	};

	static int __init mc13892_regulator_init(void)
	{
	return platform_driver_register(&mc13892_regulator_driver);
	}
	subsys_initcall(mc13892_regulator_init);

	static void __exit mc13892_regulator_exit(void)
	{
	platform_driver_unregister(&mc13892_regulator_driver);
	}
	module_exit(mc13892_regulator_exit);

	MODULE_LICENSE("GPL v2");
	MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
	MODULE_DESCRIPTION("Regulator Driver for Freescale MC13892 PMIC");
	MODULE_ALIAS("platform:mc13892-regulator");