Re: [PATCH V2 2/2] mfd: 88pm88x: initialize 88pm886/88pm880 base support

[Lee Jones <lee.jones-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>]

On Fri, 12 Jun 2015, Yi Zhang wrote:

> 88pm886 and 88pm880 are combo PMIC chip, which integrates
> regulator, onkey, rtc, gpadc, charger, fuelgauge function;
> 
> this patch add the basic support for them, adding related resource, such as
> interrupt, preparing for the client-device driver
> 
> Signed-off-by: Yi Zhang <yizhang-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>
> ---
>  drivers/mfd/88pm880-table.c     | 173 ++++++++++++
>  drivers/mfd/88pm886-table.c     | 173 ++++++++++++
>  drivers/mfd/88pm88x-core.c      | 584 ++++++++++++++++++++++++++++++++++++++++
>  drivers/mfd/88pm88x-i2c.c       | 167 ++++++++++++
>  drivers/mfd/88pm88x-irq.c       | 171 ++++++++++++
>  drivers/mfd/88pm88x.h           |  51 ++++

I'm initially concerned that you aren't (re)using _any_ of the 88pm*
files already in the subsystem. 

>  drivers/mfd/Kconfig             |  12 +
>  drivers/mfd/Makefile            |   3 +
>  include/linux/mfd/88pm880-reg.h |  98 +++++++
>  include/linux/mfd/88pm880.h     |  59 ++++
>  include/linux/mfd/88pm886-reg.h |  59 ++++
>  include/linux/mfd/88pm886.h     |  55 ++++
>  include/linux/mfd/88pm88x-reg.h | 118 ++++++++
>  include/linux/mfd/88pm88x.h     | 202 ++++++++++++++
>  14 files changed, 1925 insertions(+)

Sending 2k line patches doesn't make reviewing a particularly pleasant
experience.  Please divide it up into a properly separated set.  If
you feel as though the set can't be split up, then you're probably
coding it wrongly.

>  create mode 100644 drivers/mfd/88pm880-table.c
>  create mode 100644 drivers/mfd/88pm886-table.c
>  create mode 100644 drivers/mfd/88pm88x-core.c
>  create mode 100644 drivers/mfd/88pm88x-i2c.c
>  create mode 100644 drivers/mfd/88pm88x-irq.c
>  create mode 100644 drivers/mfd/88pm88x.h
>  create mode 100644 include/linux/mfd/88pm880-reg.h
>  create mode 100644 include/linux/mfd/88pm880.h
>  create mode 100644 include/linux/mfd/88pm886-reg.h
>  create mode 100644 include/linux/mfd/88pm886.h
>  create mode 100644 include/linux/mfd/88pm88x-reg.h
>  create mode 100644 include/linux/mfd/88pm88x.h
> 
> diff --git a/drivers/mfd/88pm880-table.c b/drivers/mfd/88pm880-table.c
> new file mode 100644
> index 0000000..28ca860
> --- /dev/null
> +++ b/drivers/mfd/88pm880-table.c
> @@ -0,0 +1,173 @@
> +/*
> + * Marvell 88PM880 specific setting
> + *
> + * Copyright (C) 2015 Marvell International Ltd.
> + *  Yi Zhang <yizhang-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>

Tea Maker, Project Manger, CEO, Janitor?

Or "Author: "

> + * 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/kernel.h>
> +#include <linux/device.h>
> +#include <linux/mfd/88pm88x.h>
> +#include <linux/mfd/88pm880.h>
> +#include <linux/mfd/88pm880-reg.h>
> +#include <linux/mfd/88pm88x-reg.h>
> +
> +#include "88pm88x.h"
> +
> +#define PM880_BUCK_NAME		"88pm880-buck"
> +#define PM880_LDO_NAME		"88pm880-ldo"
> +
> +const struct regmap_config pm880_base_i2c_regmap = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +	.max_register = 0xfe,
> +};
> +
> +const struct regmap_config pm880_power_i2c_regmap = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +	.max_register = 0xfe,
> +};
> +
> +const struct regmap_config pm880_gpadc_i2c_regmap = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +	.max_register = 0xfe,
> +};
> +
> +const struct regmap_config pm880_battery_i2c_regmap = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +	.max_register = 0xfe,
> +};
> +
> +const struct regmap_config pm880_test_i2c_regmap = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +	.max_register = 0xfe,
> +};
> +
> +static const struct resource buck_resources[] = {
> +	{
> +	.name = PM880_BUCK_NAME,

Tabbing.

> +	},
> +};
> +
> +static const struct resource ldo_resources[] = {
> +	{
> +	.name = PM880_LDO_NAME,

Tabbing.

> +	},
> +};
> +
> +const struct mfd_cell pm880_cell_devs[] = {
> +	CELL_DEV(PM880_BUCK_NAME, buck_resources, "marvell,88pm880-buck1a", 0),
> +	CELL_DEV(PM880_BUCK_NAME, buck_resources, "marvell,88pm880-buck2", 1),
> +	CELL_DEV(PM880_BUCK_NAME, buck_resources, "marvell,88pm880-buck3", 2),
> +	CELL_DEV(PM880_BUCK_NAME, buck_resources, "marvell,88pm880-buck4", 3),
> +	CELL_DEV(PM880_BUCK_NAME, buck_resources, "marvell,88pm880-buck5", 4),
> +	CELL_DEV(PM880_BUCK_NAME, buck_resources, "marvell,88pm880-buck6", 5),
> +	CELL_DEV(PM880_BUCK_NAME, buck_resources, "marvell,88pm880-buck7", 6),
> +	CELL_DEV(PM880_LDO_NAME, ldo_resources, "marvell,88pm880-ldo1", 7),
> +	CELL_DEV(PM880_LDO_NAME, ldo_resources, "marvell,88pm880-ldo2", 8),
> +	CELL_DEV(PM880_LDO_NAME, ldo_resources, "marvell,88pm880-ldo3", 9),
> +	CELL_DEV(PM880_LDO_NAME, ldo_resources, "marvell,88pm880-ldo4", 10),
> +	CELL_DEV(PM880_LDO_NAME, ldo_resources, "marvell,88pm880-ldo5", 11),
> +	CELL_DEV(PM880_LDO_NAME, ldo_resources, "marvell,88pm880-ldo6", 12),
> +	CELL_DEV(PM880_LDO_NAME, ldo_resources, "marvell,88pm880-ldo7", 13),
> +	CELL_DEV(PM880_LDO_NAME, ldo_resources, "marvell,88pm880-ldo8", 14),
> +	CELL_DEV(PM880_LDO_NAME, ldo_resources, "marvell,88pm880-ldo9", 15),
> +	CELL_DEV(PM880_LDO_NAME, ldo_resources, "marvell,88pm880-ldo10", 16),
> +	CELL_DEV(PM880_LDO_NAME, ldo_resources, "marvell,88pm880-ldo11", 17),
> +	CELL_DEV(PM880_LDO_NAME, ldo_resources, "marvell,88pm880-ldo12", 18),
> +	CELL_DEV(PM880_LDO_NAME, ldo_resources, "marvell,88pm880-ldo13", 19),
> +	CELL_DEV(PM880_LDO_NAME, ldo_resources, "marvell,88pm880-ldo14", 20),
> +	CELL_DEV(PM880_LDO_NAME, ldo_resources, "marvell,88pm880-ldo15", 21),
> +	CELL_DEV(PM880_LDO_NAME, ldo_resources, "marvell,88pm880-ldo16", 22),
> +	CELL_DEV(PM880_LDO_NAME, ldo_resources, "marvell,88pm880-ldo17", 23),
> +	CELL_DEV(PM880_LDO_NAME, ldo_resources, "marvell,88pm880-ldo18", 24),
> +};

You don't want an MFD for each regulator.  See the DT documentation
for regulators.

> +struct pmic_cell_info pm880_cell_info = {
> +	.cells   = pm880_cell_devs,
> +	.cell_nr = ARRAY_SIZE(pm880_cell_devs),
> +};

No need for this, please remove it.

> +static const struct reg_default pm880_base_patch[] = {
> +	{PM88X_WDOG, 0x1},	 /* disable watchdog */

Pad it out like you did the others "0x01".

> +	{PM88X_AON_CTRL2, 0x2a},  /* output 32kHZ from XO */

kHz

> +	{PM88X_BK_OSC_CTRL1, 0x0f}, /* OSC_FREERUN = 1, to lock FLL */

Don't put bit names in comments -- you should define them instead.

> +	{PM88X_LOWPOWER2, 0x20}, /* XO_LJ = 1, enable low jitter for 32kHZ */

Remove the bit name -- second part is fine.

> +	/* enable LPM for internal reference group in sleep */

I see you're not a fan of using capital letter to start a sentence?

> +	{PM88X_LOWPOWER4, 0xc0},

No comment?

> +	{PM88X_BK_OSC_CTRL3, 0xc0}, /* set the duty cycle of charger DC/DC to max */
> +};

This would be easier to read if you lined it up:

	{PM88X_WDOG,		0x01}, /* disable watchdog */
	{PM88X_AON_CTRL2,	0x2a}, /* output 32kHZ from XO */
	{PM88X_BK_OSC_CTRL1,	0x0f}, /* OSC_FREERUN = 1, to lock FLL */
	{PM88X_LOWPOWER2,	0x20}, /* XO_LJ = 1, enable low jitter for 32kHZ */
	/* enable LPM for internal reference group in sleep */
	{PM88X_LOWPOWER4,	0xc0},
	{PM88X_BK_OSC_CTRL3,	0xc0}, /* set the duty cycle of charger DC/DC to max */

... don't you think?

I also think the values should be defined.  If you disagree, at the
_very least_ please sharpen up the comments.

> +static const struct reg_default pm880_power_patch[] = {
> +};

What's the point of this?

> +static const struct reg_default pm880_gpadc_patch[] = {
> +	{PM88X_GPADC_CONFIG6, 0x03}, /* enable non-stop mode */
> +};

I personally prefer spaces after the first and before the second curly
bracket.

> +static const struct reg_default pm880_battery_patch[] = {
> +	{PM88X_CHGBK_CONFIG6, 0xe1},
> +};

As above.

> +static const struct reg_default pm880_test_patch[] = {
> +};

Why do you have an empty struct const?

> +/* 88pm880 chip itself related */

I have no idea what this means?

> +int pm880_apply_patch(struct pm88x_chip *chip)
> +{
> +	int ret, size;
> +
> +	if (!chip || !chip->base_regmap || !chip->power_regmap ||
> +	    !chip->gpadc_regmap || !chip->battery_regmap ||
> +	    !chip->test_regmap)
> +		return -EINVAL;

You already checked for this in pm88x_post_init_chip().

> +	size = ARRAY_SIZE(pm880_base_patch);
> +	if (size == 0)
> +		goto power;
> +	ret = regmap_register_patch(chip->base_regmap, pm880_base_patch, size);
> +	if (ret < 0)

I assume any non-zero return value is bad.  If so, please change all
of these too "if (ret)".

> +		return ret;
> +
> +power:
> +	size = ARRAY_SIZE(pm880_power_patch);
> +	if (size == 0)
> +		goto gpadc;
> +	ret = regmap_register_patch(chip->power_regmap, pm880_power_patch, size);
> +	if (ret < 0)
> +		return ret;
> +
> +gpadc:
> +	size = ARRAY_SIZE(pm880_gpadc_patch);
> +	if (size == 0)
> +		goto battery;
> +	ret = regmap_register_patch(chip->gpadc_regmap, pm880_gpadc_patch, size);
> +	if (ret < 0)
> +		return ret;

'\n'

> +battery:
> +	size = ARRAY_SIZE(pm880_battery_patch);
> +	if (size == 0)
> +		goto test;
> +	ret = regmap_register_patch(chip->battery_regmap, pm880_battery_patch, size);
> +	if (ret < 0)
> +		return ret;
> +
> +test:
> +	size = ARRAY_SIZE(pm880_test_patch);
> +	if (size == 0)
> +		goto out;
> +	ret = regmap_register_patch(chip->test_regmap, pm880_test_patch, size);
> +	if (ret < 0)
> +		return ret;

'\n'

> +out:
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(pm880_apply_patch);
> diff --git a/drivers/mfd/88pm886-table.c b/drivers/mfd/88pm886-table.c
> new file mode 100644
> index 0000000..897ee82
> --- /dev/null
> +++ b/drivers/mfd/88pm886-table.c
> @@ -0,0 +1,173 @@
> +/*
> + * Marvell 88PM886 specific setting
> + *
> + * Copyright (C) 2015 Marvell International Ltd.
> + *  Yi Zhang <yizhang-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.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/kernel.h>
> +#include <linux/device.h>
> +#include <linux/mfd/88pm88x.h>
> +#include <linux/mfd/88pm886.h>
> +#include <linux/mfd/88pm886-reg.h>
> +#include <linux/mfd/88pm88x-reg.h>
> +
> +#include "88pm88x.h"
> +
> +#define PM886_BUCK_NAME		"88pm886-buck"
> +#define PM886_LDO_NAME		"88pm886-ldo"
> +
> +const struct regmap_config pm886_base_i2c_regmap = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +	.max_register = 0xfe,
> +};
> +
> +const struct regmap_config pm886_power_i2c_regmap = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +	.max_register = 0xfe,
> +};
> +
> +const struct regmap_config pm886_gpadc_i2c_regmap = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +	.max_register = 0xfe,
> +};
> +
> +const struct regmap_config pm886_battery_i2c_regmap = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +	.max_register = 0xfe,
> +};
> +
> +const struct regmap_config pm886_test_i2c_regmap = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +	.max_register = 0xfe,
> +};
> +
> +static const struct resource buck_resources[] = {
> +	{
> +	.name = PM886_BUCK_NAME,
> +	},
> +};
> +
> +static const struct resource ldo_resources[] = {
> +	{
> +	.name = PM886_LDO_NAME,
> +	},
> +};
> +
> +const struct mfd_cell pm886_cell_devs[] = {
> +	CELL_DEV(PM886_BUCK_NAME, buck_resources, "marvell,88pm886-buck1", 0),
> +	CELL_DEV(PM886_BUCK_NAME, buck_resources, "marvell,88pm886-buck2", 1),
> +	CELL_DEV(PM886_BUCK_NAME, buck_resources, "marvell,88pm886-buck3", 2),
> +	CELL_DEV(PM886_BUCK_NAME, buck_resources, "marvell,88pm886-buck4", 3),
> +	CELL_DEV(PM886_BUCK_NAME, buck_resources, "marvell,88pm886-buck5", 4),
> +	CELL_DEV(PM886_LDO_NAME, ldo_resources, "marvell,88pm886-ldo1", 5),
> +	CELL_DEV(PM886_LDO_NAME, ldo_resources, "marvell,88pm886-ldo2", 6),
> +	CELL_DEV(PM886_LDO_NAME, ldo_resources, "marvell,88pm886-ldo3", 7),
> +	CELL_DEV(PM886_LDO_NAME, ldo_resources, "marvell,88pm886-ldo4", 8),
> +	CELL_DEV(PM886_LDO_NAME, ldo_resources, "marvell,88pm886-ldo5", 9),
> +	CELL_DEV(PM886_LDO_NAME, ldo_resources, "marvell,88pm886-ldo6", 10),
> +	CELL_DEV(PM886_LDO_NAME, ldo_resources, "marvell,88pm886-ldo7", 11),
> +	CELL_DEV(PM886_LDO_NAME, ldo_resources, "marvell,88pm886-ldo8", 12),
> +	CELL_DEV(PM886_LDO_NAME, ldo_resources, "marvell,88pm886-ldo9", 13),
> +	CELL_DEV(PM886_LDO_NAME, ldo_resources, "marvell,88pm886-ldo10", 14),
> +	CELL_DEV(PM886_LDO_NAME, ldo_resources, "marvell,88pm886-ldo11", 15),
> +	CELL_DEV(PM886_LDO_NAME, ldo_resources, "marvell,88pm886-ldo12", 16),
> +	CELL_DEV(PM886_LDO_NAME, ldo_resources, "marvell,88pm886-ldo13", 17),
> +	CELL_DEV(PM886_LDO_NAME, ldo_resources, "marvell,88pm886-ldo14", 18),
> +	CELL_DEV(PM886_LDO_NAME, ldo_resources, "marvell,88pm886-ldo15", 19),
> +	CELL_DEV(PM886_LDO_NAME, ldo_resources, "marvell,88pm886-ldo16", 20),
> +};

You don't want an MFD for each regulator.  See the DT documentation
for regulators.

> +struct pmic_cell_info pm886_cell_info = {
> +	.cells   = pm886_cell_devs,
> +	.cell_nr = ARRAY_SIZE(pm886_cell_devs),
> +};

No need for this, please remove it.

> +static const struct reg_default pm886_base_patch[] = {
> +	{PM88X_WDOG, 0x1},	 /* disable watchdog */
> +	{PM88X_GPIO_CTRL1, 0x40}, /* gpio1: dvc    , gpio0: input   */
> +	{PM88X_GPIO_CTRL2, 0x00}, /*               , gpio2: input   */
> +	{PM88X_GPIO_CTRL3, 0x44}, /* dvc2          , dvc1           */
> +	{PM88X_GPIO_CTRL4, 0x00}, /* gpio5v_1:input, gpio5v_2: input*/
> +	{PM88X_AON_CTRL2, 0x2a},  /* output 32kHZ from XO */
> +	{PM88X_BK_OSC_CTRL1, 0x0f}, /* OSC_FREERUN = 1, to lock FLL */
> +	{PM88X_LOWPOWER2, 0x20}, /* XO_LJ = 1, enable low jitter for 32kHZ */
> +	/* enable LPM for internal reference group in sleep */
> +	{PM88X_LOWPOWER4, 0xc0},
> +	{PM88X_BK_OSC_CTRL3, 0xc0}, /* set the duty cycle of charger DC/DC to max */
> +};
> +
> +static const struct reg_default pm886_power_patch[] = {
> +};
> +
> +static const struct reg_default pm886_gpadc_patch[] = {
> +	{PM88X_GPADC_CONFIG6, 0x03}, /* enable non-stop mode */
> +};
> +
> +static const struct reg_default pm886_battery_patch[] = {
> +	{PM88X_CHGBK_CONFIG6, 0xe1},
> +};
> +
> +static const struct reg_default pm886_test_patch[] = {
> +};
> +
> +/* 88pm886 chip itself related */
> +int pm886_apply_patch(struct pm88x_chip *chip)
> +{
> +	int ret, size;
> +
> +	if (!chip || !chip->base_regmap || !chip->power_regmap ||
> +	    !chip->gpadc_regmap || !chip->battery_regmap ||
> +	    !chip->test_regmap)
> +		return -EINVAL;

You already checked for this in pm88x_post_init_chip().

> +	size = ARRAY_SIZE(pm886_base_patch);
> +	if (size == 0)
> +		goto power;
> +	ret = regmap_register_patch(chip->base_regmap, pm886_base_patch, size);
> +	if (ret < 0)
> +		return ret;
> +
> +power:
> +	size = ARRAY_SIZE(pm886_power_patch);
> +	if (size == 0)
> +		goto gpadc;
> +	ret = regmap_register_patch(chip->power_regmap, pm886_power_patch, size);
> +	if (ret < 0)
> +		return ret;
> +
> +gpadc:
> +	size = ARRAY_SIZE(pm886_gpadc_patch);
> +	if (size == 0)
> +		goto battery;
> +	ret = regmap_register_patch(chip->gpadc_regmap, pm886_gpadc_patch, size);
> +	if (ret < 0)
> +		return ret;
> +battery:
> +	size = ARRAY_SIZE(pm886_battery_patch);
> +	if (size == 0)
> +		goto test;
> +	ret = regmap_register_patch(chip->battery_regmap, pm886_battery_patch, size);
> +	if (ret < 0)
> +		return ret;
> +
> +test:
> +	size = ARRAY_SIZE(pm886_test_patch);
> +	if (size == 0)
> +		goto out;
> +	ret = regmap_register_patch(chip->test_regmap, pm886_test_patch, size);
> +	if (ret < 0)
> +		return ret;
> +out:
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(pm886_apply_patch);

A lot of this code looks identical to the previous *-table.c file and
a bunch of it is duplicated line from line.  Please amalgamate them
and find a way to reduce the amount of lines.  I can think of several
ways this can be done. 

> diff --git a/drivers/mfd/88pm88x-core.c b/drivers/mfd/88pm88x-core.c
> new file mode 100644
> index 0000000..343e0a0
> --- /dev/null
> +++ b/drivers/mfd/88pm88x-core.c
> @@ -0,0 +1,584 @@
> +/*
> + * Base driver for Marvell 88PM886/88PM880 PMIC
> + *
> + * Copyright (C) 2015 Marvell International Ltd.
> + *  Yi Zhang <yizhang-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.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/kernel.h>
> +#include <linux/module.h>
> +#include <linux/err.h>
> +#include <linux/i2c.h>
> +#include <linux/irq.h>
> +#include <linux/interrupt.h>
> +#include <linux/irqdomain.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/88pm88x.h>
> +#include <linux/mfd/88pm886.h>
> +#include <linux/mfd/88pm880.h>
> +#include <linux/regulator/machine.h>
> +
> +#include "88pm88x.h"
> +
> +#define PM88X_POWER_UP_LOG		(0x17)
> +#define PM88X_POWER_DOWN_LOG1		(0xe5)
> +#define PM88X_POWER_DOWN_LOG2		(0xe6)
> +#define PM88X_SW_PDOWN			(1 << 5)
> +
> +static const struct resource onkey_resources[] = {
> +	CELL_IRQ_RESOURCE(PM88X_ONKEY_NAME, PM88X_IRQ_ONKEY),
> +};
> +
> +static const struct resource rtc_resources[] = {
> +	CELL_IRQ_RESOURCE(PM88X_RTC_NAME, PM88X_IRQ_RTC),
> +};
> +
> +static const struct resource charger_resources[] = {
> +	CELL_IRQ_RESOURCE("88pm88x-chg-fail", PM88X_IRQ_CHG_FAIL),
> +	CELL_IRQ_RESOURCE("88pm88x-chg-done", PM88X_IRQ_CHG_DONE),
> +	CELL_IRQ_RESOURCE("88pm88x-chg-good", PM88X_IRQ_CHG_GOOD),
> +};
> +
> +static const struct resource battery_resources[] = {
> +	CELL_IRQ_RESOURCE("88pm88x-bat-cc", PM88X_IRQ_CC),
> +	CELL_IRQ_RESOURCE("88pm88x-bat-volt", PM88X_IRQ_VBAT),
> +	CELL_IRQ_RESOURCE("88pm88x-bat-detect", PM88X_IRQ_BAT_DET),
> +};
> +
> +static const struct resource headset_resources[] = {
> +	CELL_IRQ_RESOURCE("88pm88x-headset-det", PM88X_IRQ_HS_DET),
> +	CELL_IRQ_RESOURCE("88pm88x-mic-det", PM88X_IRQ_MIC_DET),
> +};
> +
> +static const struct resource vbus_resources[] = {
> +	CELL_IRQ_RESOURCE("88pm88x-vbus-det", PM88X_IRQ_VBUS),
> +	CELL_IRQ_RESOURCE("88pm88x-gpadc0", PM88X_IRQ_GPADC0),
> +	CELL_IRQ_RESOURCE("88pm88x-gpadc1", PM88X_IRQ_GPADC1),
> +	CELL_IRQ_RESOURCE("88pm88x-gpadc2", PM88X_IRQ_GPADC2),
> +	CELL_IRQ_RESOURCE("88pm88x-gpadc3", PM88X_IRQ_GPADC3),
> +	CELL_IRQ_RESOURCE("88pm88x-otg-fail", PM88X_IRQ_OTG_FAIL),
> +};
> +
> +static const struct resource leds_resources[] = {
> +	CELL_IRQ_RESOURCE("88pm88x-cfd-fail", PM88X_IRQ_CFD_FAIL),
> +};
> +
> +static const struct resource dvc_resources[] = {
> +	{
> +	.name = PM88X_DVC_NAME,
> +	},
> +};
> +
> +static const struct resource rgb_resources[] = {
> +	{
> +	.name = PM88X_RGB_NAME,
> +	},
> +};
> +
> +static const struct resource gpadc_resources[] = {
> +	{
> +	.name = PM88X_GPADC_NAME,
> +	},
> +};

Tabbing for all of the above.

In fact, for one line struct entries, I would prefer:

   { .name = PM88X_GPADC_NAME },

> +static const struct mfd_cell common_cell_devs[] = {
> +	CELL_DEV(PM88X_RTC_NAME, rtc_resources, "marvell,88pm88x-rtc", -1),
> +	CELL_DEV(PM88X_ONKEY_NAME, onkey_resources, "marvell,88pm88x-onkey", -1),
> +	CELL_DEV(PM88X_CHARGER_NAME, charger_resources, "marvell,88pm88x-charger", -1),
> +	CELL_DEV(PM88X_BATTERY_NAME, battery_resources, "marvell,88pm88x-battery", -1),
> +	CELL_DEV(PM88X_HEADSET_NAME, headset_resources, "marvell,88pm88x-headset", -1),
> +	CELL_DEV(PM88X_VBUS_NAME, vbus_resources, "marvell,88pm88x-vbus", -1),
> +	CELL_DEV(PM88X_CFD_NAME, leds_resources, "marvell,88pm88x-leds", PM88X_FLASH_LED),
> +	CELL_DEV(PM88X_CFD_NAME, leds_resources, "marvell,88pm88x-leds", PM88X_TORCH_LED),
> +	CELL_DEV(PM88X_DVC_NAME, dvc_resources, "marvell,88pm88x-dvc", -1),
> +	CELL_DEV(PM88X_RGB_NAME, rgb_resources, "marvell,88pm88x-rgb0", PM88X_RGB_LED0),
> +	CELL_DEV(PM88X_RGB_NAME, rgb_resources, "marvell,88pm88x-rgb1", PM88X_RGB_LED1),
> +	CELL_DEV(PM88X_RGB_NAME, rgb_resources, "marvell,88pm88x-rgb2", PM88X_RGB_LED2),

This isn't how it works.  You should have one LED entry here, then let
the LED driver take care of all this stuff.

> +	CELL_DEV(PM88X_GPADC_NAME, gpadc_resources, "marvell,88pm88x-gpadc", -1),
> +};


> +const struct of_device_id pm88x_of_match[] = {
> +	{ .compatible = "marvell,88pm886", .data = (void *)PM886 },
> +	{ .compatible = "marvell,88pm880", .data = (void *)PM880 },
> +	{},
> +};
> +
> +struct pm88x_chip *pm88x_init_chip(struct i2c_client *client)

Why is this in a seperate file to the one it's called from?  I
suggest you move it into the *-i2c.c file.

> +{
> +	struct pm88x_chip *chip;
> +
> +	chip = devm_kzalloc(&client->dev, sizeof(struct pm88x_chip), GFP_KERNEL);

Calling this 'chip' is confusing, as it has different connotations
depending on the subsystem.

ddata (for device data) or priv for (private) is more common.

> +	if (!chip)
> +		return ERR_PTR(-ENOMEM);
> +
> +	chip->client = client;
> +	chip->irq = client->irq;
> +	chip->dev = &client->dev;

Why are you storing 'client' AND 'dev'?  Do you use 'client' directly?
If not, ditch it.  If you do, then just store 'client' and extract
'client->dev' when you require it.

> +	chip->ldo_page_addr = client->addr + 1;
> +	chip->power_page_addr = client->addr + 1;
> +	chip->gpadc_page_addr = client->addr + 2;
> +	chip->battery_page_addr = client->addr + 3;
> +	chip->buck_page_addr = client->addr + 4;
> +	chip->test_page_addr = client->addr + 7;

I have no idea what's going on here, but it's almost certainly not
correct.  Instead of separating these out per device have a base
address and create DEFINES for each of them.

> +	dev_set_drvdata(chip->dev, chip);
> +	i2c_set_clientdata(chip->client, chip);

Why do you have both of these?

> +	device_init_wakeup(&client->dev, 1);
> +
> +	return chip;

You're wearing a belt and 2 pairs of braces here.  You just stored
'chip' into the device's private data area, why are you returning it
too? 

> +}
> +
> +int pm88x_parse_dt(struct device_node *np, struct pm88x_chip *chip)
> +{
> +	if (!chip)
> +		return -EINVAL;
> +
> +	chip->irq_mode =
> +		!of_property_read_bool(np, "marvell,88pm88x-irq-write-clear");

A new function for just one line?  Just move it into probe()

> +	return 0;
> +}
> +
> +

Superfluous '\n'.

> +static void parse_powerup_down_log(struct pm88x_chip *chip)
> +{
> +	int powerup, powerdown1, powerdown2, bit;
> +	int powerup_bits, powerdown1_bits, powerdown2_bits;
> +	static const char * const powerup_name[] = {
> +		"ONKEY_WAKEUP	",
> +		"CHG_WAKEUP	",
> +		"EXTON_WAKEUP	",
> +		"SMPL_WAKEUP	",
> +		"ALARM_WAKEUP	",
> +		"FAULT_WAKEUP	",
> +		"BAT_WAKEUP	",
> +		"WLCHG_WAKEUP	",
> +	};
> +	static const char * const powerdown1_name[] = {
> +		"OVER_TEMP ",
> +		"UV_VANA5  ",
> +		"SW_PDOWN  ",
> +		"FL_ALARM  ",
> +		"WD        ",
> +		"LONG_ONKEY",
> +		"OV_VSYS   ",
> +		"RTC_RESET "
> +	};
> +	static const char * const powerdown2_name[] = {
> +		"HYB_DONE   ",
> +		"UV_VBAT    ",
> +		"HW_RESET2  ",
> +		"PGOOD_PDOWN",
> +		"LONKEY_RTC ",
> +		"HW_RESET1  ",
> +	};
> +
> +	regmap_read(chip->base_regmap, PM88X_POWER_UP_LOG, &powerup);
> +	regmap_read(chip->base_regmap, PM88X_POWER_DOWN_LOG1, &powerdown1);
> +	regmap_read(chip->base_regmap, PM88X_POWER_DOWN_LOG2, &powerdown2);
> +
> +	/*
> +	 * mask reserved bits
> +	 *
> +	 * note: HYB_DONE and HW_RESET1 are kept,
> +	 *       but should not be considered as power down events
> +	 */
> +	switch (chip->type) {
> +	case PM886:
> +		powerup &= 0x7f;
> +		powerdown2 &= 0x1f;
> +		powerup_bits = 7;
> +		powerdown1_bits = 8;
> +		powerdown2_bits = 5;
> +		break;
> +	case PM880:
> +		powerdown2 &= 0x3f;
> +		powerup_bits = 8;
> +		powerdown1_bits = 8;
> +		powerdown2_bits = 6;
> +		break;
> +	default:
> +		return;
> +	}
> +
> +	/* keep globals for external usage */
> +	chip->powerup = powerup;
> +	chip->powerdown1 = powerdown1;
> +	chip->powerdown2 = powerdown2;
> +
> +	/* power up log */
> +	dev_info(chip->dev, "powerup log 0x%x: 0x%x\n",
> +		 PM88X_POWER_UP_LOG, powerup);
> +	dev_info(chip->dev, " ----------------------------\n");
> +	dev_info(chip->dev, "|  name(power up) |  status  |\n");
> +	dev_info(chip->dev, "|-----------------|----------|\n");
> +	for (bit = 0; bit < powerup_bits; bit++)
> +		dev_info(chip->dev, "|  %s  |    %x     |\n",
> +			powerup_name[bit], (powerup >> bit) & 1);
> +	dev_info(chip->dev, " ----------------------------\n");
> +
> +	/* power down log1 */
> +	dev_info(chip->dev, "PowerDW Log1 0x%x: 0x%x\n",
> +		PM88X_POWER_DOWN_LOG1, powerdown1);
> +	dev_info(chip->dev, " -------------------------------\n");
> +	dev_info(chip->dev, "| name(power down1)  |  status  |\n");
> +	dev_info(chip->dev, "|--------------------|----------|\n");
> +	for (bit = 0; bit < powerdown1_bits; bit++)
> +		dev_info(chip->dev, "|    %s      |    %x     |\n",
> +			powerdown1_name[bit], (powerdown1 >> bit) & 1);
> +	dev_info(chip->dev, " -------------------------------\n");
> +
> +	/* power down log2 */
> +	dev_info(chip->dev, "PowerDW Log2 0x%x: 0x%x\n",
> +		PM88X_POWER_DOWN_LOG2, powerdown2);
> +	dev_info(chip->dev, " -------------------------------\n");
> +	dev_info(chip->dev, "|  name(power down2) |  status  |\n");
> +	dev_info(chip->dev, "|--------------------|----------|\n");
> +	for (bit = 0; bit < powerdown2_bits; bit++)
> +		dev_info(chip->dev, "|    %s     |    %x     |\n",
> +			powerdown2_name[bit], (powerdown2 >> bit) & 1);
> +	dev_info(chip->dev, " -------------------------------\n");
> +
> +	/* write to clear power down log */
> +	regmap_write(chip->base_regmap, PM88X_POWER_DOWN_LOG1, 0xff);
> +	regmap_write(chip->base_regmap, PM88X_POWER_DOWN_LOG2, 0xff);
> +}
> +
> +static const char *chip_stepping_to_string(unsigned int id)
> +{
> +	switch (id) {
> +	case 0xa1:
> +		return "88pm886 A1";
> +	case 0xb1:
> +		return "88pm880 A1";
> +	default:
> +		return "Unknown";
> +	}
> +}
> +
> +int pm88x_post_init_chip(struct pm88x_chip *chip)
> +{
> +	int ret;
> +	unsigned int val;
> +
> +	if (!chip || !chip->base_regmap || !chip->power_regmap ||
> +	    !chip->gpadc_regmap || !chip->battery_regmap)
> +		return -EINVAL;
> +
> +	/* save chip stepping */
> +	ret = regmap_read(chip->base_regmap, PM88X_ID_REG, &val);
> +	if (ret < 0) {
> +		dev_err(chip->dev, "Failed to read chip ID: %d\n", ret);
> +		return ret;
> +	}
> +	chip->chip_id = val;
> +
> +	dev_info(chip->dev, "PM88X chip ID = 0x%x(%s)\n", val,
> +			chip_stepping_to_string(chip->chip_id));
> +
> +	/* read before alarm wake up bit before initialize interrupt */
> +	ret = regmap_read(chip->base_regmap, PM88X_RTC_ALARM_CTRL1, &val);
> +	if (ret < 0) {
> +		dev_err(chip->dev, "Failed to read RTC register: %d\n", ret);
> +		return ret;
> +	}
> +	chip->rtc_wakeup = !!(val & PM88X_ALARM_WAKEUP);
> +
> +	parse_powerup_down_log(chip);
> +
> +	return 0;
> +}
> +
> +int pm88x_init_pages(struct pm88x_chip *chip)
> +{
> +	struct i2c_client *client = chip->client;
> +	const struct regmap_config *base_regmap_config;
> +	const struct regmap_config *power_regmap_config;
> +	const struct regmap_config *gpadc_regmap_config;
> +	const struct regmap_config *battery_regmap_config;
> +	const struct regmap_config *test_regmap_config;
> +	int ret = 0;
> +
> +	if (!chip || !chip->power_page_addr ||
> +	    !chip->gpadc_page_addr || !chip->battery_page_addr)
> +		return -ENODEV;
> +
> +	chip->type = pm88x_of_get_type(&client->dev);
> +	switch (chip->type) {
> +	case PM886:
> +		base_regmap_config = &pm886_base_i2c_regmap;
> +		power_regmap_config = &pm886_power_i2c_regmap;
> +		gpadc_regmap_config = &pm886_gpadc_i2c_regmap;
> +		battery_regmap_config = &pm886_battery_i2c_regmap;
> +		test_regmap_config = &pm886_test_i2c_regmap;
> +		break;
> +	case PM880:
> +		base_regmap_config = &pm880_base_i2c_regmap;
> +		power_regmap_config = &pm880_power_i2c_regmap;
> +		gpadc_regmap_config = &pm880_gpadc_i2c_regmap;
> +		battery_regmap_config = &pm880_battery_i2c_regmap;
> +		test_regmap_config = &pm880_test_i2c_regmap;
> +		break;
> +	default:
> +		return -ENODEV;

You could probably do with an error message here.

> +	}
> +
> +	/* base page */
> +	chip->base_regmap = devm_regmap_init_i2c(client, base_regmap_config);
> +	if (IS_ERR(chip->base_regmap)) {
> +		dev_err(chip->dev, "Failed to init base_regmap: %d\n", ret);
> +		ret = PTR_ERR(chip->base_regmap);
> +		goto out;
> +	}
> +
> +	/* power page */
> +	chip->power_page = i2c_new_dummy(client->adapter, chip->power_page_addr);
> +	if (!chip->power_page) {
> +		dev_err(chip->dev, "Failed to new power_page: %d\n", ret);
> +		ret = -ENODEV;
> +		goto out;
> +	}
> +	chip->power_regmap = devm_regmap_init_i2c(chip->power_page,
> +						  power_regmap_config);
> +	if (IS_ERR(chip->power_regmap)) {
> +		dev_err(chip->dev, "Failed to init power_regmap: %d\n", ret);
> +		ret = PTR_ERR(chip->power_regmap);
> +		goto out;
> +	}
> +
> +	/* gpadc page */
> +	chip->gpadc_page = i2c_new_dummy(client->adapter, chip->gpadc_page_addr);
> +	if (!chip->gpadc_page) {
> +		dev_err(chip->dev, "Failed to new gpadc_page: %d\n", ret);
> +		ret = -ENODEV;
> +		goto out;
> +	}
> +	chip->gpadc_regmap = devm_regmap_init_i2c(chip->gpadc_page,
> +						  gpadc_regmap_config);
> +	if (IS_ERR(chip->gpadc_regmap)) {
> +		dev_err(chip->dev, "Failed to init gpadc_regmap: %d\n", ret);
> +		ret = PTR_ERR(chip->gpadc_regmap);
> +		goto out;
> +	}
> +
> +	/* battery page */
> +	chip->battery_page = i2c_new_dummy(client->adapter, chip->battery_page_addr);
> +	if (!chip->battery_page) {
> +		dev_err(chip->dev, "Failed to new gpadc_page: %d\n", ret);
> +		ret = -ENODEV;
> +		goto out;
> +	}
> +	chip->battery_regmap = devm_regmap_init_i2c(chip->battery_page,
> +						  battery_regmap_config);
> +	if (IS_ERR(chip->battery_regmap)) {
> +		dev_err(chip->dev, "Failed to init battery_regmap: %d\n", ret);
> +		ret = PTR_ERR(chip->battery_regmap);
> +		goto out;
> +	}
> +
> +	/* test page */
> +	chip->test_page = i2c_new_dummy(client->adapter, chip->test_page_addr);
> +	if (!chip->test_page) {
> +		dev_err(chip->dev, "Failed to new test_page: %d\n", ret);
> +		ret = -ENODEV;
> +		goto out;
> +	}
> +	chip->test_regmap = devm_regmap_init_i2c(chip->test_page,
> +						 test_regmap_config);
> +	if (IS_ERR(chip->test_regmap)) {
> +		dev_err(chip->dev, "Failed to init test_regmap: %d\n", ret);
> +		ret = PTR_ERR(chip->test_regmap);
> +		goto out;
> +	}

There's a lot of duplicated code here.  You can save quite a few lines
if you thought about it I'm sure.

> +	chip->type = pm88x_of_get_type(&client->dev);
> +	switch (chip->type) {
> +	case PM886:
> +		/* ldo page */
> +		chip->ldo_page = chip->power_page;
> +		chip->ldo_regmap = chip->power_regmap;
> +		/* buck page */
> +		chip->buck_regmap = chip->power_regmap;
> +		break;
> +	case PM880:
> +		/* ldo page */
> +		chip->ldo_page = chip->power_page;
> +		chip->ldo_regmap = chip->power_regmap;
> +
> +		/* buck page */
> +		chip->buck_page = i2c_new_dummy(client->adapter,
> +						chip->buck_page_addr);
> +		if (!chip->buck_page) {
> +			dev_err(chip->dev, "Failed to new buck_page: %d\n", ret);
> +			ret = -ENODEV;
> +			goto out;
> +		}
> +		chip->buck_regmap = devm_regmap_init_i2c(chip->buck_page,
> +							 power_regmap_config);
> +		if (IS_ERR(chip->buck_regmap)) {
> +			dev_err(chip->dev, "Failed to init buck_regmap: %d\n", ret);
> +			ret = PTR_ERR(chip->buck_regmap);
> +			goto out;
> +		}
> +
> +		break;
> +	default:
> +		ret = -EINVAL;

Firstly, this probably won't happen, as the first switch() succeeded.
Secondly, you are returning a different error value, why?  Thirdly,
you probably want an error message here.

> +		break;
> +	}
> +out:
> +	return ret;
> +}
> +
> +void pm800_exit_pages(struct pm88x_chip *chip)
> +{
> +	if (!chip)
> +		return;
> +
> +	if (chip->ldo_page)
> +		i2c_unregister_device(chip->ldo_page);
> +	if (chip->gpadc_page)
> +		i2c_unregister_device(chip->gpadc_page);
> +	if (chip->test_page)
> +		i2c_unregister_device(chip->test_page);

'\n'

> +	/* no need to unregister ldo_page */
> +	switch (chip->type) {
> +	case PM886:
> +		break;
> +	case PM880:
> +		if (chip->buck_page)
> +			i2c_unregister_device(chip->buck_page);
> +		break;
> +	default:
> +		break;
> +	}

No need for this big switch().  Just do:

	if (chip->buck_page)
		i2c_unregister_device(chip->buck_page);

> +}
> +
> +int pm88x_init_subdev(struct pm88x_chip *chip)
> +{
> +	int ret;

'\n'

This will raise a Checkpatch error.  Did you run this set though
checkpatch.pl?

> +	if (!chip)
> +		return -EINVAL;

I'm pretty sure you can't get here if !chip.

> +	ret = mfd_add_devices(chip->dev, 0, common_cell_devs,

What does 0 mean?

> +			      ARRAY_SIZE(common_cell_devs), NULL, 0,
> +			      regmap_irq_get_domain(chip->irq_data));
> +	if (ret < 0)

if (ret)

> +		return ret;
> +
> +	switch (chip->type) {
> +	case PM886:
> +		ret = mfd_add_devices(chip->dev, 0, pm886_cell_info.cells,
> +				      pm886_cell_info.cell_nr, NULL, 0,
> +				      regmap_irq_get_domain(chip->irq_data));
> +		break;
> +	case PM880:
> +		ret = mfd_add_devices(chip->dev, 0, pm880_cell_info.cells,
> +				      pm880_cell_info.cell_nr, NULL, 0,
> +				      regmap_irq_get_domain(chip->irq_data));

switch() on {pm880_cell_info|pm886_cell_info.cells}.cells etc and just
call mfd_add_devices() once.

> +		break;
> +	default:
> +		break;
> +	}
> +	return ret;
> +}
> +
> +static int (*apply_to_chip)(struct pm88x_chip *chip);
> +/* PMIC chip itself related */
> +int pm88x_apply_patch(struct pm88x_chip *chip)
> +{
> +	if (!chip || !chip->client)
> +		return -EINVAL;
> +
> +	chip->type = pm88x_of_get_type(&chip->client->dev);
> +	switch (chip->type) {
> +	case PM886:
> +		apply_to_chip = pm886_apply_patch;
> +		break;
> +	case PM880:
> +		apply_to_chip = pm880_apply_patch;
> +		break;
> +	default:
> +		break;
> +	}
> +	if (apply_to_chip)
> +		apply_to_chip(chip);
> +	return 0;
> +}

What on earth is going on here?

Why bother assigning the *fn()?

> +int pm88x_stepping_fixup(struct pm88x_chip *chip)
> +{
> +	if (!chip || !chip->client)
> +		return -EINVAL;

I don't think this can happen.

> +	chip->type = pm88x_of_get_type(&chip->client->dev);
> +	switch (chip->type) {
> +	case PM886:
> +	case PM880:
> +	default:
> +		break;
> +	}
> +
> +	return 0;
> +}

This function appears to do nothing.  Why is it here?

> +int pm88x_apply_board_fixup(struct pm88x_chip *chip, struct device_node *np)
> +{
> +	/* add board design specific setting, parsed via device tree */
> +	return 0;
> +}

What's this?  Another empty function.

> +long pm88x_of_get_type(struct device *dev)
> +{
> +	const struct of_device_id *id = of_match_device(pm88x_of_match, dev);
> +
> +	if (id)
> +		return (long)id->data;
> +	else
> +		return 0;
> +}

Just do this once, in probe and store the value in driver data.  No
need for a function to do this.

> +void pm88x_dev_exit(struct pm88x_chip *chip)
> +{
> +	mfd_remove_devices(chip->dev);
> +	pm88x_irq_exit(chip);
> +}
> +
> +void pm88x_power_off(void)
> +{
> +	pr_info("powers off the system.");
> +	/* TODO: implement later */

Why can't you implement this now?

> +	for (;;)
> +		cpu_relax();

What's the point of this?

> +}
> +
> +int pm88x_reboot_notifier_callback(struct notifier_block *this,
> +				   unsigned long code, void *unused)
> +{
> +	struct pm88x_chip *chip =
> +		container_of(this, struct pm88x_chip, reboot_notifier);
> +
> +	switch (code) {
> +	case SYS_HALT:
> +	case SYS_POWER_OFF:
> +		dev_info(chip->dev, "system is down.\n");
> +		break;
> +	case SYS_RESTART:
> +	default:
> +		dev_info(chip->dev, "system will reboot.\n");
> +		break;
> +	}
> +
> +	return 0;
> +}

This function is pointless.

> diff --git a/drivers/mfd/88pm88x-i2c.c b/drivers/mfd/88pm88x-i2c.c
> new file mode 100644
> index 0000000..36842ed
> --- /dev/null
> +++ b/drivers/mfd/88pm88x-i2c.c
> @@ -0,0 +1,167 @@
> +/*
> + * 88pm88x-i2c.c  --  88pm88x i2c bus interface
> + *
> + * Copyright (C) 2015 Marvell International Ltd.
> + *  Yi Zhang <yizhang-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.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/err.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/slab.h>
> +#include <linux/of.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/88pm886.h>
> +#include <linux/mfd/88pm880.h>
> +#include <linux/mfd/88pm88x.h>
> +
> +static int pm88x_i2c_probe(struct i2c_client *client,
> +		       const struct i2c_device_id *id)
> +{
> +	struct pm88x_chip *chip;
> +	struct device_node *node = client->dev.of_node;
> +	int ret = 0;
> +
> +	chip = pm88x_init_chip(client);

This function doesn't actually do any chip initialisation.

... and the code should be moved into here.

> +	if (IS_ERR(chip)) {
> +		ret = PTR_ERR(chip);
> +		dev_err(chip->dev, "initialize 88pm88x chip fails!\n");

"Failed to initialise chip"

> +		goto err;

Just return.

> +	}
> +
> +	ret = pm88x_parse_dt(node, chip);
> +	if (ret < 0) {
> +		dev_err(chip->dev, "parse dt fails!\n");

"Failed to parse DT"

> +		goto err;

Just return.

> +	}
> +
> +	ret = pm88x_init_pages(chip);
> +	if (ret) {
> +		dev_err(chip->dev, "initialize 88pm88x pages fails!\n");

Etc ...

> +		goto err;

Just return.

> +	}
> +
> +	ret = pm88x_post_init_chip(chip);
> +	if (ret) {
> +		dev_err(chip->dev, "post initialize 88pm88x fails!\n");
> +		goto err;

Just return.

> +	}
> +
> +	ret = pm88x_irq_init(chip);
> +	if (ret) {
> +		dev_err(chip->dev, "initialize 88pm88x interrupt fails!\n");
> +		goto err_init_irq;
> +	}
> +
> +	ret = pm88x_init_subdev(chip);
> +	if (ret) {
> +		dev_err(chip->dev, "initialize 88pm88x sub-device fails\n");
> +		goto err_init_subdev;
> +	}
> +
> +	/* patch for PMIC chip itself */
> +	ret = pm88x_apply_patch(chip);
> +	if (ret) {
> +		dev_err(chip->dev, "apply 88pm88x register patch fails\n");
> +		goto err_apply_patch;
> +	}
> +
> +	/* fixup according PMIC stepping */

This comment doesn't make any sense.

> +	ret = pm88x_stepping_fixup(chip);
> +	if (ret) {
> +		dev_err(chip->dev, "fixup according to chip stepping\n");
> +		goto err_apply_patch;
> +	}
> +
> +	/* patch for board configuration */
> +	ret = pm88x_apply_board_fixup(chip, node);
> +	if (ret) {
> +		dev_err(chip->dev, "apply 88pm88x register for board fails\n");
> +		goto err_apply_patch;
> +	}
> +
> +	pm_power_off = pm88x_power_off;
> +
> +	chip->reboot_notifier.notifier_call = pm88x_reboot_notifier_callback;
> +	register_reboot_notifier(&(chip->reboot_notifier));
> +
> +	return 0;
> +
> +err_apply_patch:
> +	mfd_remove_devices(chip->dev);
> +err_init_subdev:
> +	regmap_del_irq_chip(chip->irq, chip->irq_data);
> +err_init_irq:
> +	pm800_exit_pages(chip);
> +err:

Remove this label.

> +	return ret;
> +}
> +
> +static int pm88x_i2c_remove(struct i2c_client *i2c)
> +{
> +	struct pm88x_chip *chip = dev_get_drvdata(&i2c->dev);
> +	pm88x_dev_exit(chip);
> +	return 0;
> +}

Checkpatch will warn you about this function.

> +static const struct i2c_device_id pm88x_i2c_id[] = {
> +	{ "88pm886", PM886 },
> +	{ "88pm880", PM880 },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, pm88x_i2c_id);
> +
> +static int pm88x_i2c_suspend(struct device *dev)
> +{
> +	return 0;
> +}
> +
> +static int pm88x_i2c_resume(struct device *dev)
> +{
> +	return 0;
> +}

Why even supply them?

> +static SIMPLE_DEV_PM_OPS(pm88x_pm_ops, pm88x_i2c_suspend, pm88x_i2c_resume);
> +
> +static struct i2c_driver pm88x_i2c_driver = {
> +	.driver = {
> +		.name	= "88pm88x",
> +		.owner	= THIS_MODULE,

Remove this line.

> +		.pm	= &pm88x_pm_ops,
> +		.of_match_table	= of_match_ptr(pm88x_of_match),
> +	},
> +	.probe		= pm88x_i2c_probe,
> +	.remove		= pm88x_i2c_remove,
> +	.id_table	= pm88x_i2c_id,
> +};
> +
> +static int __init pm88x_i2c_init(void)
> +{
> +	int ret;
> +
> +	ret = i2c_add_driver(&pm88x_i2c_driver);
> +	if (ret != 0) {
> +		pr_err("88pm88x I2C registration failed %d\n", ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +subsys_initcall(pm88x_i2c_init);
> +
> +static void __exit pm88x_i2c_exit(void)
> +{
> +	i2c_del_driver(&pm88x_i2c_driver);
> +}
> +module_exit(pm88x_i2c_exit);

I think you want to remove all of this and replace with
module_i2c_driver().

> +MODULE_DESCRIPTION("88pm88x I2C bus interface");
> +MODULE_AUTHOR("Yi Zhang<yizhang-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>");

Missing a space.

> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/mfd/88pm88x-irq.c b/drivers/mfd/88pm88x-irq.c
> new file mode 100644
> index 0000000..0126df0
> --- /dev/null
> +++ b/drivers/mfd/88pm88x-irq.c
> @@ -0,0 +1,171 @@
> +/*
> + * 88pm886 interrupt support
> + *
> + * Copyright (C) 2015 Marvell International Ltd.
> + *  Yi Zhang <yizhang-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.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/delay.h>
> +#include <linux/gpio.h>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/irqdomain.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/slab.h>
> +#include <linux/mfd/88pm88x.h>
> +#include <linux/mfd/88pm886.h>
> +#include <linux/mfd/88pm880.h>
> +
> +/* interrupt status registers */
> +#define PM88X_INT_STATUS1		(0x05)
> +
> +#define PM88X_INT_ENA_1			(0x0a)
> +#define PM88X_ONKEY_INT_ENA1		(1 << 0)
> +#define PM88X_EXTON_INT_ENA1		(1 << 1)
> +#define PM88X_CHG_INT_ENA1		(1 << 2)
> +#define PM88X_BAT_INT_ENA1		(1 << 3)
> +#define PM88X_RTC_INT_ENA1		(1 << 4)
> +#define PM88X_CLASSD_INT_ENA1		(1 << 5)
> +#define PM88X_XO_INT_ENA1		(1 << 6)
> +#define PM88X_GPIO_INT_ENA1		(1 << 7)
> +
> +#define PM88X_INT_ENA_2			(0x0b)
> +#define PM88X_VBAT_INT_ENA2		(1 << 0)
> +#define PM88X_RSVED1_INT_ENA2		(1 << 1)
> +#define PM88X_VBUS_INT_ENA2		(1 << 2)
> +#define PM88X_ITEMP_INT_ENA2		(1 << 3)
> +#define PM88X_BUCK_PGOOD_INT_ENA2	(1 << 4)
> +#define PM88X_LDO_PGOOD_INT_ENA2	(1 << 5)
> +#define PM88X_RSVED6_INT_ENA2		(1 << 6)
> +#define PM88X_RSVED7_INT_ENA2		(1 << 7)
> +
> +#define PM88X_INT_ENA_3			(0x0c)
> +#define PM88X_GPADC0_INT_ENA3		(1 << 0)
> +#define PM88X_GPADC1_INT_ENA3		(1 << 1)
> +#define PM88X_GPADC2_INT_ENA3		(1 << 2)
> +#define PM88X_GPADC3_INT_ENA3		(1 << 3)
> +#define PM88X_MIC_INT_ENA3		(1 << 4)
> +#define PM88X_HS_INT_ENA3		(1 << 5)
> +#define PM88X_GND_INT_ENA3		(1 << 6)
> +#define PM88X_RSVED7_INT_ENA3		(1 << 7)
> +
> +#define PM88X_INT_ENA_4			(0x0d)
> +#define PM88X_CHG_FAIL_INT_ENA4		(1 << 0)
> +#define PM88X_CHG_DONE_INT_ENA4		(1 << 1)
> +#define PM88X_RSVED2_INT_ENA4		(1 << 2)
> +#define PM88X_OTG_FAIL_INT_ENA4		(1 << 3)
> +#define PM88X_RSVED4_INT_ENA4		(1 << 4)
> +#define PM88X_CHG_ILIM_INT_ENA4		(1 << 5)
> +#define PM88X_CC_INT_ENA4		(1 << 6)
> +#define PM88X_RSVED7_INT_ENA4		(1 << 7)
> +
> +#define PM88X_MISC_CONFIG2		(0x15)
> +#define PM88X_INV_INT			(1 << 0)
> +#define PM88X_INT_CLEAR			(1 << 1)
> +#define PM88X_INT_RC			(0 << 1)
> +#define PM88X_INT_WC			(1 << 1)
> +#define PM88X_INT_MASK_MODE		(1 << 2)

Replace all "1 <<" with BIT()

> +static const struct regmap_irq pm88x_irqs[] = {
> +	/* INT0 */
> +	[PM88X_IRQ_ONKEY] = {.reg_offset = 0, .mask = PM88X_ONKEY_INT_ENA1,},
> +	[PM88X_IRQ_EXTON] = {.reg_offset = 0, .mask = PM88X_EXTON_INT_ENA1,},
> +	[PM88X_IRQ_CHG_GOOD] = {.reg_offset = 0, .mask = PM88X_CHG_INT_ENA1,},
> +	[PM88X_IRQ_BAT_DET] = {.reg_offset = 0, .mask = PM88X_BAT_INT_ENA1,},
> +	[PM88X_IRQ_RTC] = {.reg_offset = 0, .mask = PM88X_RTC_INT_ENA1,},
> +	[PM88X_IRQ_CLASSD] = { .reg_offset = 0, .mask = PM88X_CLASSD_INT_ENA1,},
> +	[PM88X_IRQ_XO] = {.reg_offset = 0, .mask = PM88X_XO_INT_ENA1,},
> +	[PM88X_IRQ_GPIO] = {.reg_offset = 0, .mask = PM88X_GPIO_INT_ENA1,},
> +
> +	/* INT1 */
> +	[PM88X_IRQ_VBAT] = {.reg_offset = 1, .mask = PM88X_VBAT_INT_ENA2,},
> +	[PM88X_IRQ_VBUS] = {.reg_offset = 1, .mask = PM88X_VBUS_INT_ENA2,},
> +	[PM88X_IRQ_ITEMP] = {.reg_offset = 1, .mask = PM88X_ITEMP_INT_ENA2,},
> +	[PM88X_IRQ_BUCK_PGOOD] = {
> +		.reg_offset = 1,
> +		.mask = PM88X_BUCK_PGOOD_INT_ENA2,
> +	},
> +	[PM88X_IRQ_LDO_PGOOD] = {
> +		.reg_offset = 1,
> +		.mask = PM88X_LDO_PGOOD_INT_ENA2,
> +	},
> +	/* INT2 */
> +	[PM88X_IRQ_GPADC0] = {.reg_offset = 2, .mask = PM88X_GPADC0_INT_ENA3,},
> +	[PM88X_IRQ_GPADC1] = {.reg_offset = 2, .mask = PM88X_GPADC1_INT_ENA3,},
> +	[PM88X_IRQ_GPADC2] = {.reg_offset = 2, .mask = PM88X_GPADC2_INT_ENA3,},
> +	[PM88X_IRQ_GPADC3] = {.reg_offset = 2, .mask = PM88X_GPADC3_INT_ENA3,},
> +	[PM88X_IRQ_MIC_DET] = {.reg_offset = 2, .mask = PM88X_MIC_INT_ENA3,},
> +	[PM88X_IRQ_HS_DET] = {.reg_offset = 2, .mask = PM88X_HS_INT_ENA3,},
> +	[PM88X_IRQ_GND_DET] = {.reg_offset = 2, .mask = PM88X_GND_INT_ENA3,},

This is not how we lay out structures (your code below is correct).

> +	/* INT3 */
> +	[PM88X_IRQ_CHG_FAIL] = {
> +		.reg_offset = 3,
> +		.mask = PM88X_CHG_FAIL_INT_ENA4,
> +	},
> +	[PM88X_IRQ_CHG_DONE] = {
> +		.reg_offset = 3,
> +		.mask = PM88X_CHG_DONE_INT_ENA4,
> +	},
> +	[PM88X_IRQ_OTG_FAIL] = {
> +		.reg_offset = 3,
> +		.mask = PM88X_OTG_FAIL_INT_ENA4,
> +	},
> +	[PM88X_IRQ_CHG_ILIM] = {
> +		.reg_offset = 3,
> +		.mask = PM88X_CHG_ILIM_INT_ENA4,
> +	},
> +	[PM88X_IRQ_CC] = {.reg_offset = 3, .mask = PM88X_CC_INT_ENA4,},
> +};
> +
> +struct regmap_irq_chip pm88x_irq_chip = {
> +	.name = "88pm88x",
> +	.irqs = pm88x_irqs,
> +	.num_irqs = ARRAY_SIZE(pm88x_irqs),
> +

No need for the '\n'.

> +	.num_regs = 4,
> +	.status_base = PM88X_INT_STATUS1,
> +	.mask_base = PM88X_INT_ENA_1,
> +	.ack_base = PM88X_INT_STATUS1,
> +	.mask_invert = 1,
> +};
> +
> +int pm88x_irq_init(struct pm88x_chip *chip)
> +{
> +	int mask, data, ret;
> +	struct regmap *map;

Not sure this variable is even needed, but if you want to keep it,
please rename to regmap.

> +	if (!chip || !chip->base_regmap || !chip->irq) {
> +		pr_err("cannot initialize interrupt!\n");
> +		return -EINVAL;
> +	}
> +	map = chip->base_regmap;
> +
> +	/*
> +	 * irq_mode defines the way of clearing interrupt.
> +	 * it's read-clear by default.
> +	 */
> +	mask = PM88X_INV_INT | PM88X_INT_CLEAR | PM88X_INT_MASK_MODE;
> +	data = (chip->irq_mode) ? PM88X_INT_WC : PM88X_INT_RC;
> +	ret = regmap_update_bits(map, PM88X_MISC_CONFIG2, mask, data);
> +	if (ret < 0) {
> +		dev_err(chip->dev, "cannot set interrupt mode!\n");
> +		return ret;
> +	}
> +
> +	ret = regmap_add_irq_chip(map, chip->irq, IRQF_ONESHOT, -1,
> +				  &pm88x_irq_chip, &chip->irq_data);
> +	return ret;
> +}
> +
> +int pm88x_irq_exit(struct pm88x_chip *chip)
> +{
> +	regmap_del_irq_chip(chip->irq, chip->irq_data);
> +	return 0;
> +}
> diff --git a/drivers/mfd/88pm88x.h b/drivers/mfd/88pm88x.h
> new file mode 100644
> index 0000000..a85a486
> --- /dev/null
> +++ b/drivers/mfd/88pm88x.h
> @@ -0,0 +1,51 @@
> +#ifndef _MFD_88PM88X_H
> +#define _MFD_88PM88X_H
> +
> +#include <linux/kernel.h>
> +#include <linux/of.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/core.h>
> +
> +struct pmic_cell_info {
> +	const struct mfd_cell *cells;
> +	int		cell_nr;
> +};

No need for this, please move it.

> +#define CELL_IRQ_RESOURCE(_name, _irq) { \
> +	.name = _name, \
> +	.start = _irq, .end = _irq, \
> +	.flags = IORESOURCE_IRQ, \
> +	}

This already exists, DEFINE_RES*.

> +#define CELL_DEV(_name, _r, _compatible, _id) { \
> +	.name = _name, \
> +	.of_compatible = _compatible, \
> +	.num_resources = ARRAY_SIZE(_r), \
> +	.resources = _r, \
> +	.id = _id, \
> +	}

This is not required.

If you feel the need for an MFD Cell macro, you probably have too many
MFD cells and you have done something wrong..

> +/* 88pm886 */
> +extern const struct regmap_config pm886_base_i2c_regmap;
> +extern const struct regmap_config pm886_power_i2c_regmap;
> +extern const struct regmap_config pm886_gpadc_i2c_regmap;
> +extern const struct regmap_config pm886_battery_i2c_regmap;
> +extern const struct regmap_config pm886_test_i2c_regmap;
> +
> +extern const struct mfd_cell pm886_cell_devs[];
> +extern struct pmic_cell_info pm886_cell_info;
> +
> +int pm886_apply_patch(struct pm88x_chip *chip);
> +
> +/* 88pm880 */
> +extern const struct regmap_config pm880_base_i2c_regmap;
> +extern const struct regmap_config pm880_power_i2c_regmap;
> +extern const struct regmap_config pm880_gpadc_i2c_regmap;
> +extern const struct regmap_config pm880_battery_i2c_regmap;
> +extern const struct regmap_config pm880_test_i2c_regmap;
> +
> +extern const struct mfd_cell pm880_cell_devs[];
> +extern struct pmic_cell_info pm880_cell_info;
> +
> +int pm880_apply_patch(struct pm88x_chip *chip);

Place all of your code in the correct files and all these horrible
global externs should vanish.

> +#endif
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index d5ad04d..bdebca9 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -390,6 +390,18 @@ config MFD_KEMPLD
>  	  This driver can also be built as a module. If so, the module
>  	  will be called kempld-core.
>  
> +config MFD_88PM88X
> +	tristate "Marvell 88PM886/880 PMIC"
> +	depends on I2C=y
> +	select REGMAP_I2C
> +	select MFD_CORE
> +	help
> +	  This supports for Marvell 88PM88X Series Power Management IC:
> +	  88pm886 and 88pm880;
> +	  This includes the I2C driver, the interrupt resource distribution
> +	  and the core APIs, for individual sub-device as voltage regulators,
> +	  RTC, charger, fuelgauge, etc, select under the corresponding menus.
> +
>  config MFD_88PM800
>  	tristate "Marvell 88PM800"
>  	depends on I2C=y
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 0e5cfeb..365d1fa 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -6,6 +6,9 @@
>  obj-$(CONFIG_MFD_88PM860X)	+= 88pm860x.o
>  obj-$(CONFIG_MFD_88PM800)	+= 88pm800.o 88pm80x.o
>  obj-$(CONFIG_MFD_88PM805)	+= 88pm805.o 88pm80x.o
> +88pm88x-objs			:= 88pm88x-core.o 88pm88x-i2c.o 88pm88x-irq.o 88pm886-table.o 88pm880-table.o
> +obj-$(CONFIG_MFD_88PM88X)	+= 88pm88x.o
> +
>  obj-$(CONFIG_MFD_SM501)		+= sm501.o
>  obj-$(CONFIG_MFD_ASIC3)		+= asic3.o tmio_core.o
>  obj-$(CONFIG_MFD_BCM590XX)	+= bcm590xx.o
> diff --git a/include/linux/mfd/88pm880-reg.h b/include/linux/mfd/88pm880-reg.h
> new file mode 100644
> index 0000000..fdf2315
> --- /dev/null
> +++ b/include/linux/mfd/88pm880-reg.h

You don't need a seperate header file for register values.  Just put
them in include/linux/mfd/88pm880.h.

> @@ -0,0 +1,98 @@
> +/*
> + * Marvell 88PM880 registers
> + *
> + * Copyright (C) 2014 Marvell International Ltd.
> + *  Yi Zhang <yizhang-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.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.
> + */
> +
> +#ifndef __LINUX_MFD_88PM880_REG_H
> +#define __LINUX_MFD_88PM880_REG_H
> +
> +#define PM880_BUCK1_VOUT	(0x28)
> +
> +#define PM880_BUCK1A_VOUT	(0x28) /* voltage 0 */
> +#define PM880_BUCK1A_1_VOUT	(0x29)
> +#define PM880_BUCK1A_2_VOUT	(0x2a)
> +#define PM880_BUCK1A_3_VOUT	(0x2b)
> +#define PM880_BUCK1A_4_VOUT	(0x2c)
> +#define PM880_BUCK1A_5_VOUT	(0x2d)
> +#define PM880_BUCK1A_6_VOUT	(0x2e)
> +#define PM880_BUCK1A_7_VOUT	(0x2f)
> +#define PM880_BUCK1A_8_VOUT	(0x30)
> +#define PM880_BUCK1A_9_VOUT	(0x31)
> +#define PM880_BUCK1A_10_VOUT	(0x32)
> +#define PM880_BUCK1A_11_VOUT	(0x33)
> +#define PM880_BUCK1A_12_VOUT	(0x34)
> +#define PM880_BUCK1A_13_VOUT	(0x35)
> +#define PM880_BUCK1A_14_VOUT	(0x36)
> +#define PM880_BUCK1A_15_VOUT	(0x37)
> +
> +#define PM880_BUCK1B_VOUT	(0x40)
> +#define PM880_BUCK1B_1_VOUT	(0x41)
> +#define PM880_BUCK1B_2_VOUT	(0x42)
> +#define PM880_BUCK1B_3_VOUT	(0x43)
> +#define PM880_BUCK1B_4_VOUT	(0x44)
> +#define PM880_BUCK1B_5_VOUT	(0x45)
> +#define PM880_BUCK1B_6_VOUT	(0x46)
> +#define PM880_BUCK1B_7_VOUT	(0x47)
> +#define PM880_BUCK1B_8_VOUT	(0x48)
> +#define PM880_BUCK1B_9_VOUT	(0x49)
> +#define PM880_BUCK1B_10_VOUT	(0x4a)
> +#define PM880_BUCK1B_11_VOUT	(0x4b)
> +#define PM880_BUCK1B_12_VOUT	(0x4c)
> +#define PM880_BUCK1B_13_VOUT	(0x4d)
> +#define PM880_BUCK1B_14_VOUT	(0x4e)
> +#define PM880_BUCK1B_15_VOUT	(0x4f)
> +
> +/* buck7 has dvc function */
> +#define PM880_BUCK7_VOUT	(0xb8) /* voltage 0 */
> +#define PM880_BUCK7_1_VOUT	(0xb9)
> +#define PM880_BUCK7_2_VOUT	(0xba)
> +#define PM880_BUCK7_3_VOUT	(0xbb)
> +
> +/*
> + * buck sleep mode control registers:
> + * 00-disable,
> + * 01/10-sleep voltage,
> + * 11-active voltage
> + */
> +#define PM880_BUCK1A_SLP_CTRL	(0x27)
> +#define PM880_BUCK1B_SLP_CTRL	(0x3c)
> +#define PM880_BUCK2_SLP_CTRL	(0x54)
> +#define PM880_BUCK3_SLP_CTRL	(0x6c)
> +/* TODO: there are 7 controls bit for buck4~7 */
> +#define PM880_BUCK4_SLP_CTRL	(0x84)
> +#define PM880_BUCK5_SLP_CTRL	(0x94)
> +#define PM880_BUCK6_SLP_CTRL	(0xa4)
> +#define PM880_BUCK7_SLP_CTRL	(0xb4)
> +
> +/*
> + * ldo sleep mode control registers:
> + * 00-disable,
> + * 01/10-sleep voltage,
> + * 11-active voltage
> + */
> +#define PM880_LDO1_SLP_CTRL	(0x21)
> +#define PM880_LDO2_SLP_CTRL	(0x27)
> +#define PM880_LDO3_SLP_CTRL	(0x2d)
> +#define PM880_LDO4_SLP_CTRL	(0x33)
> +#define PM880_LDO5_SLP_CTRL	(0x39)
> +#define PM880_LDO6_SLP_CTRL	(0x3f)
> +#define PM880_LDO7_SLP_CTRL	(0x45)
> +#define PM880_LDO8_SLP_CTRL	(0x4b)
> +#define PM880_LDO9_SLP_CTRL	(0x51)
> +#define PM880_LDO10_SLP_CTRL	(0x57)
> +#define PM880_LDO11_SLP_CTRL	(0x5d)
> +#define PM880_LDO12_SLP_CTRL	(0x63)
> +#define PM880_LDO13_SLP_CTRL	(0x69)
> +#define PM880_LDO14_SLP_CTRL	(0x6f)
> +#define PM880_LDO15_SLP_CTRL	(0x75)
> +#define PM880_LDO16_SLP_CTRL	(0x7b)
> +#define PM880_LDO17_SLP_CTRL	(0x81)
> +#define PM880_LDO18_SLP_CTRL	(0x87)

Remove the brackets around all of the above.

> +#endif /*__LINUX_MFD_88PM880_REG_H */
> diff --git a/include/linux/mfd/88pm880.h b/include/linux/mfd/88pm880.h
> new file mode 100644
> index 0000000..94b9e063
> --- /dev/null
> +++ b/include/linux/mfd/88pm880.h
> @@ -0,0 +1,59 @@
> +/*
> + * Marvell 88PM880 Interface
> + *
> + * Copyright (C) 2015 Marvell International Ltd.
> + *  Yi Zhang <yizhang-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.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.
> + *
> + * 88pm880 specific configuration: at present it's regulators and dvc part
> + */
> +
> +#ifndef __LINUX_MFD_88PM880_H
> +#define __LINUX_MFD_88PM880_H
> +
> +#include <linux/platform_device.h>
> +#include <linux/interrupt.h>
> +#include <linux/regmap.h>
> +#include <linux/atomic.h>
> +#include <linux/reboot.h>

Why are these required?

> +#include "88pm880-reg.h"

<linux/mfd/88pm880.h>

> +enum {
> +	PM880_ID_BUCK1A = 0,
> +	PM880_ID_BUCK2,
> +	PM880_ID_BUCK3,
> +	PM880_ID_BUCK4,
> +	PM880_ID_BUCK5,
> +	PM880_ID_BUCK6,
> +	PM880_ID_BUCK7,
> +
> +	PM880_ID_BUCK_MAX = 7,
> +};
> +
> +enum {
> +	PM880_ID_LDO1 = 0,
> +	PM880_ID_LDO2,
> +	PM880_ID_LDO3,
> +	PM880_ID_LDO4,
> +	PM880_ID_LDO5,
> +	PM880_ID_LDO6,
> +	PM880_ID_LDO7,
> +	PM880_ID_LDO8,
> +	PM880_ID_LDO9,
> +	PM880_ID_LDO10,
> +	PM880_ID_LDO11,
> +	PM880_ID_LDO12,
> +	PM880_ID_LDO13,
> +	PM880_ID_LDO14 = 13,
> +	PM880_ID_LDO15,
> +	PM880_ID_LDO16 = 15,
> +
> +	PM880_ID_LDO17 = 16,
> +	PM880_ID_LDO18 = 17,
> +
> +	PM880_ID_LDO_MAX = 18,
> +};
> +#endif /* __LINUX_MFD_88PM880_H */
> diff --git a/include/linux/mfd/88pm886-reg.h b/include/linux/mfd/88pm886-reg.h
> new file mode 100644
> index 0000000..38a7ecd
> --- /dev/null
> +++ b/include/linux/mfd/88pm886-reg.h
> @@ -0,0 +1,59 @@
> +/*
> + * Marvell 88PM886 registers
> + *
> + * Copyright (C) 2014 Marvell International Ltd.
> + *  Yi Zhang <yizhang-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.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.
> + */
> +
> +#ifndef __LINUX_MFD_88PM886_REG_H
> +#define __LINUX_MFD_88PM886_REG_H
> +
> +#define PM886_BUCK1_VOUT	(0xa5)
> +#define PM886_BUCK1_1_VOUT	(0xa6)
> +#define PM886_BUCK1_2_VOUT	(0xa7)
> +#define PM886_BUCK1_3_VOUT	(0xa8)
> +#define PM886_BUCK1_4_VOUT	(0x9a)
> +#define PM886_BUCK1_5_VOUT	(0x9b)
> +#define PM886_BUCK1_6_VOUT	(0x9c)
> +#define PM886_BUCK1_7_VOUT	(0x9d)
> +
> +/*
> + * buck sleep mode control registers:
> + * 00-disable,
> + * 01/10-sleep voltage,
> + * 11-active voltage
> + */
> +#define PM886_BUCK1_SLP_CTRL	(0xa2)
> +#define PM886_BUCK2_SLP_CTRL	(0xb0)
> +#define PM886_BUCK3_SLP_CTRL	(0xbe)
> +#define PM886_BUCK4_SLP_CTRL	(0xcc)
> +#define PM886_BUCK5_SLP_CTRL	(0xda)
> +
> +/*
> + * ldo sleep mode control registers:
> + * 00-disable,
> + * 01/10-sleep voltage,
> + * 11-active voltage
> + */
> +#define PM886_LDO1_SLP_CTRL	(0x21)
> +#define PM886_LDO2_SLP_CTRL	(0x27)
> +#define PM886_LDO3_SLP_CTRL	(0x2d)
> +#define PM886_LDO4_SLP_CTRL	(0x33)
> +#define PM886_LDO5_SLP_CTRL	(0x39)
> +#define PM886_LDO6_SLP_CTRL	(0x3f)
> +#define PM886_LDO7_SLP_CTRL	(0x45)
> +#define PM886_LDO8_SLP_CTRL	(0x4b)
> +#define PM886_LDO9_SLP_CTRL	(0x51)
> +#define PM886_LDO10_SLP_CTRL	(0x57)
> +#define PM886_LDO11_SLP_CTRL	(0x5d)
> +#define PM886_LDO12_SLP_CTRL	(0x63)
> +#define PM886_LDO13_SLP_CTRL	(0x69)
> +#define PM886_LDO14_SLP_CTRL	(0x6f)
> +#define PM886_LDO15_SLP_CTRL	(0x75)
> +#define PM886_LDO16_SLP_CTRL	(0x7b)
> +
> +#endif
> diff --git a/include/linux/mfd/88pm886.h b/include/linux/mfd/88pm886.h
> new file mode 100644
> index 0000000..9390406
> --- /dev/null
> +++ b/include/linux/mfd/88pm886.h
> @@ -0,0 +1,55 @@
> +/*
> + * Marvell 88PM886 Interface
> + *
> + * Copyright (C) 2015 Marvell International Ltd.
> + *  Yi Zhang <yizhang-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.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.
> + *
> + * 88pm886 specific configuration: at present it's regulators and dvc part
> + */
> +
> +#ifndef __LINUX_MFD_88PM886_H
> +#define __LINUX_MFD_88PM886_H
> +
> +#include <linux/platform_device.h>
> +#include <linux/interrupt.h>
> +#include <linux/regmap.h>
> +#include <linux/atomic.h>
> +#include <linux/reboot.h>
> +#include "88pm886-reg.h"
> +
> +enum {
> +	PM886_ID_BUCK1 = 0,
> +	PM886_ID_BUCK2,
> +	PM886_ID_BUCK3,
> +	PM886_ID_BUCK4,
> +	PM886_ID_BUCK5,
> +
> +	PM886_ID_BUCK_MAX = 5,
> +};
> +
> +enum {
> +	PM886_ID_LDO1 = 0,
> +	PM886_ID_LDO2,
> +	PM886_ID_LDO3,
> +	PM886_ID_LDO4,
> +	PM886_ID_LDO5,
> +	PM886_ID_LDO6,
> +	PM886_ID_LDO7,
> +	PM886_ID_LDO8,
> +	PM886_ID_LDO9,
> +	PM886_ID_LDO10,
> +	PM886_ID_LDO11,
> +	PM886_ID_LDO12,
> +	PM886_ID_LDO13,
> +	PM886_ID_LDO14,
> +	PM886_ID_LDO15,
> +	PM886_ID_LDO16 = 15,
> +
> +	PM886_ID_LDO_MAX = 16,
> +};
> +
> +#endif /* __LINUX_MFD_88PM886_H */
> diff --git a/include/linux/mfd/88pm88x-reg.h b/include/linux/mfd/88pm88x-reg.h
> new file mode 100644
> index 0000000..d767b31
> --- /dev/null
> +++ b/include/linux/mfd/88pm88x-reg.h
> @@ -0,0 +1,118 @@
> +/*
> + * Marvell 88PM88X registers
> + *
> + * Copyright (C) 2014 Marvell International Ltd.
> + *  Yi Zhang <yizhang-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.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.
> + */
> +
> +#ifndef __LINUX_MFD_88PM88X_REG_H
> +#define __LINUX_MFD_88PM88X_REG_H
> +/*
> + * This file is just used for the common registers,
> + * which are shared by sub-clients
> + */
> +
> +/*--base page:--------------------------------------------------------------*/

All of the commenting above is superfluous.

> +#define PM88X_ID_REG			(0x0)
> +
> +#define PM88X_STATUS1			(0x1)
> +#define PM88X_CHG_DET			(1 << 2)
> +#define PM88X_BAT_DET			(1 << 3)
> +
> +#define PM88X_MISC_CONFIG1		(0x14)
> +#define PM88X_LONKEY_RST		(1 << 3)
> +
> +#define PM88X_WDOG			(0x1d)
> +
> +#define PM88X_LOWPOWER2			(0x21)
> +#define PM88X_LOWPOWER4			(0x23)
> +
> +/* clk control register */
> +#define PM88X_CLK_CTRL1			(0x25)
> +
> +/* gpio */
> +#define PM88X_GPIO_CTRL1		(0x30)
> +#define PM88X_GPIO0_VAL_MSK		(0x1 << 0)
> +#define PM88X_GPIO0_MODE_MSK		(0x7 << 1)
> +#define PM88X_GPIO1_VAL_MSK		(0x1 << 4)
> +#define PM88X_GPIO1_MODE_MSK		(0x7 << 5)
> +#define PM88X_GPIO1_SET_DVC		(0x2 << 5)
> +
> +#define PM88X_GPIO_CTRL2		(0x31)
> +#define PM88X_GPIO2_VAL_MSK		(0x1 << 0)
> +#define PM88X_GPIO2_MODE_MSK		(0x7 << 1)
> +
> +#define PM88X_GPIO_CTRL3		(0x32)
> +
> +#define PM88X_GPIO_CTRL4		(0x33)
> +#define PM88X_GPIO5V_1_VAL_MSK		(0x1 << 0)
> +#define PM88X_GPIO5V_1_MODE_MSK		(0x7 << 1)
> +#define PM88X_GPIO5V_2_VAL_MSK		(0x1 << 4)
> +#define PM88X_GPIO5V_2_MODE_MSK		(0x7 << 5)
> +
> +#define PM88X_BK_OSC_CTRL1		(0x50)
> +#define PM88X_BK_OSC_CTRL3		(0x52)
> +
> +#define PM88X_RTC_ALARM_CTRL1		(0xd0)
> +#define PM88X_ALARM_WAKEUP		(1 << 4)
> +#define PM88X_USE_XO			(1 << 7)
> +
> +#define PM88X_AON_CTRL2			(0xe2)
> +#define PM88X_AON_CTRL3			(0xe3)
> +#define PM88X_AON_CTRL4			(0xe4)
> +#define PM88X_AON_CTRL7			(0xe7)
> +
> +/* 0xea, 0xeb, 0xec, 0xed are reserved by RTC */
> +#define PM88X_RTC_SPARE5		(0xee)
> +#define PM88X_RTC_SPARE6		(0xef)
> +/*-------------------------------------------------------------------------*/
> +
> +/*--power page:------------------------------------------------------------*/
> +
> +/*-------------------------------------------------------------------------*/
> +
> +/*--gpadc page:------------------------------------------------------------*/

This type of commenting is messy and unwanted.

> +#define PM88X_GPADC_CONFIG1		(0x1)
> +
> +#define PM88X_GPADC_CONFIG2		(0x2)
> +#define PM88X_GPADC0_MEAS_EN		(1 << 2)
> +#define PM88X_GPADC1_MEAS_EN		(1 << 3)
> +#define PM88X_GPADC2_MEAS_EN		(1 << 4)
> +#define PM88X_GPADC3_MEAS_EN		(1 << 5)
> +
> +#define PM88X_GPADC_CONFIG3		(0x3)
> +
> +#define PM88X_GPADC_CONFIG6		(0x6)
> +#define PM88X_GPADC_CONFIG8		(0x8)
> +
> +#define PM88X_GPADC0_LOW_TH		(0x20)
> +#define PM88X_GPADC1_LOW_TH		(0x21)
> +#define PM88X_GPADC2_LOW_TH		(0x22)
> +#define PM88X_GPADC3_LOW_TH		(0x23)
> +
> +#define PM88X_GPADC0_UPP_TH		(0x30)
> +#define PM88X_GPADC1_UPP_TH		(0x31)
> +#define PM88X_GPADC2_UPP_TH		(0x32)
> +#define PM88X_GPADC3_UPP_TH		(0x33)
> +
> +#define PM88X_VBUS_MEAS1		(0x4A)
> +#define PM88X_GPADC0_MEAS1		(0x54)
> +#define PM88X_GPADC1_MEAS1		(0x56)
> +#define PM88X_GPADC2_MEAS1		(0x58)
> +#define PM88X_GPADC3_MEAS1		(0x5A)
> +
> +
> +/*--charger page:------------------------------------------------------------*/
> +#define PM88X_CHG_CONFIG1		(0x28)
> +#define PM88X_CHGBK_CONFIG6		(0x50)
> +/*-------------------------------------------------------------------------*/
> +
> +/*--test page:-------------------------------------------------------------*/
> +
> +/*-------------------------------------------------------------------------*/
> +#endif
> diff --git a/include/linux/mfd/88pm88x.h b/include/linux/mfd/88pm88x.h
> new file mode 100644
> index 0000000..efa2fe6
> --- /dev/null
> +++ b/include/linux/mfd/88pm88x.h
> @@ -0,0 +1,202 @@
> +/*
> + * Marvell 88PM88X PMIC Common Interface
> + *
> + * Copyright (C) 2014 Marvell International Ltd.
> + *  Yi Zhang <yizhang-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.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.
> + *
> + *
> + * This file configures the common part of the 88pm88x series PMIC
> + */
> +
> +#ifndef __LINUX_MFD_88PM88X_H
> +#define __LINUX_MFD_88PM88X_H
> +
> +#include <linux/platform_device.h>
> +#include <linux/interrupt.h>
> +#include <linux/regmap.h>
> +#include <linux/atomic.h>
> +#include <linux/reboot.h>
> +#include "88pm88x-reg.h"
> +#include "88pm886-reg.h"

Why are all of these required?

> +#define PM88X_RTC_NAME		"88pm88x-rtc"
> +#define PM88X_ONKEY_NAME	"88pm88x-onkey"
> +#define PM88X_CHARGER_NAME	"88pm88x-charger"
> +#define PM88X_BATTERY_NAME	"88pm88x-battery"
> +#define PM88X_HEADSET_NAME	"88pm88x-headset"
> +#define PM88X_VBUS_NAME		"88pm88x-vbus"
> +#define PM88X_CFD_NAME		"88pm88x-leds"
> +#define PM88X_RGB_NAME		"88pm88x-rgb"
> +#define PM88X_GPADC_NAME	"88pm88x-gpadc"
> +#define PM88X_DVC_NAME		"88pm88x-dvc"

I would prefer that you just used the name directly.

> +enum pm88x_type {
> +	PM886 = 1,
> +	PM880 = 2,
> +};
> +
> +enum pm88x_pages {
> +	PM88X_BASE_PAGE = 0,
> +	PM88X_LDO_PAGE,
> +	PM88X_GPADC_PAGE,
> +	PM88X_BATTERY_PAGE,
> +	PM88X_BUCK_PAGE = 4,

This is 4 anyway.

> +	PM88X_TEST_PAGE = 7,
> +};
> +
> +enum pm88x_gpadc {
> +	PM88X_NO_GPADC = -1,
> +	PM88X_GPADC0 = 0,
> +	PM88X_GPADC1,
> +	PM88X_GPADC2,
> +	PM88X_GPADC3,
> +};
> +
> +/* interrupt number */
> +enum pm88x_irq_number {
> +	PM88X_IRQ_ONKEY,	/* EN1b0 *//* 0 */

At least put a space between the comments.

> +	PM88X_IRQ_EXTON,	/* EN1b1 */
> +	PM88X_IRQ_CHG_GOOD,	/* EN1b2 */
> +	PM88X_IRQ_BAT_DET,	/* EN1b3 */
> +	PM88X_IRQ_RTC,		/* EN1b4 */
> +	PM88X_IRQ_CLASSD,	/* EN1b5 *//* 5 */
> +	PM88X_IRQ_XO,		/* EN1b6 */
> +	PM88X_IRQ_GPIO,		/* EN1b7 */
> +
> +	PM88X_IRQ_VBAT,		/* EN2b0 *//* 8 */
> +				/* EN2b1 */
> +	PM88X_IRQ_VBUS,		/* EN2b2 */
> +	PM88X_IRQ_ITEMP,	/* EN2b3 *//* 10 */
> +	PM88X_IRQ_BUCK_PGOOD,	/* EN2b4 */
> +	PM88X_IRQ_LDO_PGOOD,	/* EN2b5 */
> +
> +	PM88X_IRQ_GPADC0,	/* EN3b0 */
> +	PM88X_IRQ_GPADC1,	/* EN3b1 */
> +	PM88X_IRQ_GPADC2,	/* EN3b2 *//* 15 */
> +	PM88X_IRQ_GPADC3,	/* EN3b3 */
> +	PM88X_IRQ_MIC_DET,	/* EN3b4 */
> +	PM88X_IRQ_HS_DET,	/* EN3b5 */
> +	PM88X_IRQ_GND_DET,	/* EN3b6 */
> +
> +	PM88X_IRQ_CHG_FAIL,	/* EN4b0 *//* 20 */
> +	PM88X_IRQ_CHG_DONE,	/* EN4b1 */
> +				/* EN4b2 */
> +	PM88X_IRQ_CFD_FAIL,	/* EN4b3 */
> +	PM88X_IRQ_OTG_FAIL,	/* EN4b4 */
> +	PM88X_IRQ_CHG_ILIM,	/* EN4b5 *//* 25 */
> +				/* EN4b6 */
> +	PM88X_IRQ_CC,		/* EN4b7 *//* 27 */
> +
> +	PM88X_MAX_IRQ,			   /* 28 */
> +};
> +
> +/* 3 rgb led indicators */
> +enum {
> +	PM88X_RGB_LED0,
> +	PM88X_RGB_LED1,
> +	PM88X_RGB_LED2,
> +};
> +
> +/* camera flash/torch */
> +enum {
> +	PM88X_NO_LED = -1,
> +	PM88X_FLASH_LED = 0,
> +	PM88X_TORCH_LED,
> +};
> +
> +struct pm88x_dvc_ops {
> +	void (*level_to_reg)(u8 level);
> +};

This appears to be unused.

> +struct pm88x_buck1_dvc_desc {
> +	u8 current_reg;
> +	int max_level;
> +	int uV_step1;
> +	int uV_step2;
> +	int min_uV;
> +	int mid_uV;
> +	int max_uV;
> +	int mid_reg_val;
> +};
>
> +struct pm88x_dvc {
> +	struct device *dev;
> +	struct pm88x_chip *chip;
> +	struct pm88x_dvc_ops ops;
> +	struct pm88x_buck1_dvc_desc desc;
> +};
> +
> +struct pm88x_chip {
> +	struct i2c_client *client;
> +	struct device *dev;
> +
> +	struct i2c_client *ldo_page;	/* chip client for ldo page */
> +	struct i2c_client *power_page;	/* chip client for power page */
> +	struct i2c_client *gpadc_page;	/* chip client for gpadc page */
> +	struct i2c_client *battery_page;/* chip client for battery page */
> +	struct i2c_client *buck_page;	/* chip client for buck page */
> +	struct i2c_client *test_page;	/* chip client for test page */
> +
> +	struct regmap *base_regmap;
> +	struct regmap *ldo_regmap;
> +	struct regmap *power_regmap;
> +	struct regmap *gpadc_regmap;
> +	struct regmap *battery_regmap;
> +	struct regmap *buck_regmap;
> +	struct regmap *test_regmap;
> +	struct regmap *codec_regmap;
> +
> +	unsigned short ldo_page_addr;	/* ldo page I2C address */
> +	unsigned short power_page_addr;	/* power page I2C address */
> +	unsigned short gpadc_page_addr;	/* gpadc page I2C address */
> +	unsigned short battery_page_addr;/* battery page I2C address */
> +	unsigned short buck_page_addr;	/* buck page I2C address */
> +	unsigned short test_page_addr;	/* test page I2C address */
> +
> +	unsigned int chip_id;
> +	long type;			/* specific chip */
> +	int irq;
> +
> +	int irq_mode;			/* write/read clear */
> +	struct regmap_irq_chip_data *irq_data;
> +
> +	bool rtc_wakeup;		/* is it powered up by expired alarm? */
> +	u8 powerdown1;			/* save power down reason */
> +	u8 powerdown2;
> +	u8 powerup;			/* the reason of power on */
> +
> +	struct notifier_block reboot_notifier;
> +	struct pm88x_dvc *dvc;
> +};

This is an awful lot of junk to be held in a device data structure.
Try to remove as much as you can.

> +extern struct regmap_irq_chip pm88x_irq_chip;
> +extern const struct of_device_id pm88x_of_match[];
> +
> +struct pm88x_chip *pm88x_init_chip(struct i2c_client *client);
> +int pm88x_parse_dt(struct device_node *np, struct pm88x_chip *chip);
> +
> +int pm88x_init_pages(struct pm88x_chip *chip);
> +int pm88x_post_init_chip(struct pm88x_chip *chip);
> +void pm800_exit_pages(struct pm88x_chip *chip);
> +
> +int pm88x_init_subdev(struct pm88x_chip *chip);
> +long pm88x_of_get_type(struct device *dev);
> +void pm88x_dev_exit(struct pm88x_chip *chip);
> +
> +int pm88x_irq_init(struct pm88x_chip *chip);
> +int pm88x_irq_exit(struct pm88x_chip *chip);
> +int pm88x_apply_patch(struct pm88x_chip *chip);
> +int pm88x_stepping_fixup(struct pm88x_chip *chip);
> +int pm88x_apply_board_fixup(struct pm88x_chip *chip, struct device_node *np);
> +
> +struct pm88x_chip *pm88x_get_chip(void);
> +void pm88x_set_chip(struct pm88x_chip *chip);
> +void pm88x_power_off(void);
> +int pm88x_reboot_notifier_callback(struct notifier_block *nb,
> +				   unsigned long code, void *unused);

All of these should probably be moved into a single file, unless you
have a good reason to spread them out?

> +#endif /* __LINUX_MFD_88PM88X_H */

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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