Hi Jacob,

I think it would have been nice to have CC'd Carlo Caione, the
original writer of the driver on this.

On Mon, Sep 08, 2014 at 03:24:04PM -0700, Jacob Pan wrote:
> XPower AXP288 is a customized PMIC for Intel Baytrail-CR platforms. Similar
> to AXP202/209, AXP288 comes with USB charger, more LDO and BUCK channels, and
> AD converter. It also provides extended status and interrupt reporting
> capabilities than the devices supported in axp20x.c.
> 
> In addition to feature extension, this patch also adds ACPI binding for
> enumeration and hooks for ACPI custom operational region handlers.
> 
> Files and common data structures have been renamed from axp20x to axp2xx
> in order to suit the extended scope of devices.
> 
> This consolidated driver should support more Xpower PMICs in both device
> tree and ACPI based platforms.
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
> ---
>  drivers/mfd/axp2xx.c       | 424 +++++++++++++++++++++++++++++++++++----------
>  include/linux/mfd/axp2xx.h |  57 +++++-
>  2 files changed, 389 insertions(+), 92 deletions(-)
> 
> diff --git a/drivers/mfd/axp2xx.c b/drivers/mfd/axp2xx.c
> index c534443..cf7ed16 100644
> --- a/drivers/mfd/axp2xx.c
> +++ b/drivers/mfd/axp2xx.c
> @@ -1,10 +1,14 @@
>  /*
> - * axp20x.c - MFD core driver for the X-Powers AXP202 and AXP209
> + * axp2xx.c - MFD core driver for the X-Powers AXP202, AXP209, and AXP288

Could you do the s/axp20x/axp2xx/ in the first patch? It would make
more sense to have it there, and reduce the "noise" in this patch.

>   *
>   * AXP20x comprises an adaptive USB-Compatible PWM charger, 2 BUCK DC-DC
>   * converters, 5 LDOs, multiple 12-bit ADCs of voltage, current and temperature
>   * as well as 4 configurable GPIOs.
>   *
> + * AXP288 is a customized PMIC for Intel Baytrail CR platform. Similar to AXP20x
> + * it comes with USB charger, more LDO, BUCK channels, and status reporting
> + * capabilities.
> + *

Also, I'm not very convinced that maintaining the list of the
supported AXP chips is very future proof. We have at least 3 other
variants that we know of to support (AXP221, AXP223 and
AXP806/809). This would end up in a huge list :)

>   * Author: Carlo Caione <carlo@caione.org>
>   *
>   * This program is free software; you can redistribute it and/or modify
> @@ -25,9 +29,14 @@
>  #include <linux/mfd/core.h>
>  #include <linux/of_device.h>
>  #include <linux/of_irq.h>
> +#include <linux/acpi.h>
>  
>  #define AXP20X_OFF	0x80
>  
> +static struct mfd_cell *axp2xx_cells;
> +static int axp2xx_nr_cells;
> +static struct regmap_config *regmap_cfg;
> +
>  static const struct regmap_range axp20x_writeable_ranges[] = {
>  	regmap_reg_range(AXP20X_DATACACHE(0), AXP20X_IRQ5_STATE),
>  	regmap_reg_range(AXP20X_DCDC_MODE, AXP20X_FG_RES),
> @@ -47,6 +56,25 @@ static const struct regmap_access_table axp20x_volatile_table = {
>  	.n_yes_ranges	= ARRAY_SIZE(axp20x_volatile_ranges),
>  };
>  
> +static const struct regmap_range axp288_writeable_ranges[] = {
> +	regmap_reg_range(AXP20X_DATACACHE(0), AXP20X_IRQ6_STATE),
> +	regmap_reg_range(AXP20X_DCDC_MODE, AXP288_FG_TUNE5),
> +};
> +
> +static const struct regmap_range axp288_volatile_ranges[] = {
> +	regmap_reg_range(AXP20X_IRQ1_EN,  AXP20X_IPSOUT_V_HIGH_L),
> +};
> +
> +static const struct regmap_access_table axp288_writeable_table = {
> +	.yes_ranges	= axp288_writeable_ranges,
> +	.n_yes_ranges	= ARRAY_SIZE(axp288_writeable_ranges),
> +};
> +
> +static const struct regmap_access_table axp288_volatile_table = {
> +	.yes_ranges	= axp288_volatile_ranges,
> +	.n_yes_ranges	= ARRAY_SIZE(axp288_volatile_ranges),
> +};
> +
>  static struct resource axp20x_pek_resources[] = {
>  	{
>  		.name	= "PEK_DBR",
> @@ -61,7 +89,40 @@ static struct resource axp20x_pek_resources[] = {
>  	},
>  };
>  
> -static const struct regmap_config axp20x_regmap_config = {
> +static struct resource axp288_battery_resources[] = {
> +	{
> +		.start = AXP288_IRQ_QWBTU,
> +		.end   = AXP288_IRQ_QWBTU,
> +		.flags = IORESOURCE_IRQ,
> +	},
> +	{
> +		.start = AXP288_IRQ_WBTU,
> +		.end   = AXP288_IRQ_WBTU,
> +		.flags = IORESOURCE_IRQ,
> +	},
> +	{
> +		.start = AXP288_IRQ_QWBTO,
> +		.end   = AXP288_IRQ_QWBTO,
> +		.flags = IORESOURCE_IRQ,
> +	},
> +	{
> +		.start = AXP288_IRQ_WBTO,
> +		.end   = AXP288_IRQ_WBTO,
> +		.flags = IORESOURCE_IRQ,
> +	},
> +	{
> +		.start = AXP288_IRQ_WL2,
> +		.end   = AXP288_IRQ_WL2,
> +		.flags = IORESOURCE_IRQ,
> +	},
> +	{
> +		.start = AXP288_IRQ_WL1,
> +		.end   = AXP288_IRQ_WL1,
> +		.flags = IORESOURCE_IRQ,
> +	},
> +};
> +
> +static struct regmap_config axp20x_regmap_config = {
>  	.reg_bits	= 8,
>  	.val_bits	= 8,
>  	.wr_table	= &axp20x_writeable_table,
> @@ -70,47 +131,96 @@ static const struct regmap_config axp20x_regmap_config = {
>  	.cache_type	= REGCACHE_RBTREE,
>  };
>  
> -#define AXP20X_IRQ(_irq, _off, _mask) \
> -	[AXP20X_IRQ_##_irq] = { .reg_offset = (_off), .mask = BIT(_mask) }
> +static struct regmap_config axp288_regmap_config = {
> +	.reg_bits	= 8,
> +	.val_bits	= 8,
> +	.wr_table	= &axp288_writeable_table,
> +	.volatile_table	= &axp288_volatile_table,
> +	.max_register	= AXP288_FG_TUNE5,
> +	.cache_type	= REGCACHE_RBTREE,
> +};
> +
> +#define INIT_REGMAP_IRQ(_variant, _irq, _off, _mask)			\
> +	[_variant##_IRQ_##_irq] = { .reg_offset = (_off), .mask = BIT(_mask) }
>  
>  static const struct regmap_irq axp20x_regmap_irqs[] = {
> -	AXP20X_IRQ(ACIN_OVER_V,		0, 7),
> -	AXP20X_IRQ(ACIN_PLUGIN,		0, 6),
> -	AXP20X_IRQ(ACIN_REMOVAL,	0, 5),
> -	AXP20X_IRQ(VBUS_OVER_V,		0, 4),
> -	AXP20X_IRQ(VBUS_PLUGIN,		0, 3),
> -	AXP20X_IRQ(VBUS_REMOVAL,	0, 2),
> -	AXP20X_IRQ(VBUS_V_LOW,		0, 1),
> -	AXP20X_IRQ(BATT_PLUGIN,		1, 7),
> -	AXP20X_IRQ(BATT_REMOVAL,	1, 6),
> -	AXP20X_IRQ(BATT_ENT_ACT_MODE,	1, 5),
> -	AXP20X_IRQ(BATT_EXIT_ACT_MODE,	1, 4),
> -	AXP20X_IRQ(CHARG,		1, 3),
> -	AXP20X_IRQ(CHARG_DONE,		1, 2),
> -	AXP20X_IRQ(BATT_TEMP_HIGH,	1, 1),
> -	AXP20X_IRQ(BATT_TEMP_LOW,	1, 0),
> -	AXP20X_IRQ(DIE_TEMP_HIGH,	2, 7),
> -	AXP20X_IRQ(CHARG_I_LOW,		2, 6),
> -	AXP20X_IRQ(DCDC1_V_LONG,	2, 5),
> -	AXP20X_IRQ(DCDC2_V_LONG,	2, 4),
> -	AXP20X_IRQ(DCDC3_V_LONG,	2, 3),
> -	AXP20X_IRQ(PEK_SHORT,		2, 1),
> -	AXP20X_IRQ(PEK_LONG,		2, 0),
> -	AXP20X_IRQ(N_OE_PWR_ON,		3, 7),
> -	AXP20X_IRQ(N_OE_PWR_OFF,	3, 6),
> -	AXP20X_IRQ(VBUS_VALID,		3, 5),
> -	AXP20X_IRQ(VBUS_NOT_VALID,	3, 4),
> -	AXP20X_IRQ(VBUS_SESS_VALID,	3, 3),
> -	AXP20X_IRQ(VBUS_SESS_END,	3, 2),
> -	AXP20X_IRQ(LOW_PWR_LVL1,	3, 1),
> -	AXP20X_IRQ(LOW_PWR_LVL2,	3, 0),
> -	AXP20X_IRQ(TIMER,		4, 7),
> -	AXP20X_IRQ(PEK_RIS_EDGE,	4, 6),
> -	AXP20X_IRQ(PEK_FAL_EDGE,	4, 5),
> -	AXP20X_IRQ(GPIO3_INPUT,		4, 3),
> -	AXP20X_IRQ(GPIO2_INPUT,		4, 2),
> -	AXP20X_IRQ(GPIO1_INPUT,		4, 1),
> -	AXP20X_IRQ(GPIO0_INPUT,		4, 0),
> +	INIT_REGMAP_IRQ(AXP20X, ACIN_OVER_V,		0, 7),
> +	INIT_REGMAP_IRQ(AXP20X, ACIN_PLUGIN,		0, 6),
> +	INIT_REGMAP_IRQ(AXP20X, ACIN_REMOVAL,	        0, 5),
> +	INIT_REGMAP_IRQ(AXP20X, VBUS_OVER_V,		0, 4),
> +	INIT_REGMAP_IRQ(AXP20X, VBUS_PLUGIN,		0, 3),
> +	INIT_REGMAP_IRQ(AXP20X, VBUS_REMOVAL,	        0, 2),
> +	INIT_REGMAP_IRQ(AXP20X, VBUS_V_LOW,		0, 1),
> +	INIT_REGMAP_IRQ(AXP20X, BATT_PLUGIN,		1, 7),
> +	INIT_REGMAP_IRQ(AXP20X, BATT_REMOVAL,	        1, 6),
> +	INIT_REGMAP_IRQ(AXP20X, BATT_ENT_ACT_MODE,	1, 5),
> +	INIT_REGMAP_IRQ(AXP20X, BATT_EXIT_ACT_MODE,	1, 4),
> +	INIT_REGMAP_IRQ(AXP20X, CHARG,		        1, 3),
> +	INIT_REGMAP_IRQ(AXP20X, CHARG_DONE,		1, 2),
> +	INIT_REGMAP_IRQ(AXP20X, BATT_TEMP_HIGH,	        1, 1),
> +	INIT_REGMAP_IRQ(AXP20X, BATT_TEMP_LOW,	        1, 0),
> +	INIT_REGMAP_IRQ(AXP20X, DIE_TEMP_HIGH,	        2, 7),
> +	INIT_REGMAP_IRQ(AXP20X, CHARG_I_LOW,		2, 6),
> +	INIT_REGMAP_IRQ(AXP20X, DCDC1_V_LONG,	        2, 5),
> +	INIT_REGMAP_IRQ(AXP20X, DCDC2_V_LONG,	        2, 4),
> +	INIT_REGMAP_IRQ(AXP20X, DCDC3_V_LONG,	        2, 3),
> +	INIT_REGMAP_IRQ(AXP20X, PEK_SHORT,		2, 1),
> +	INIT_REGMAP_IRQ(AXP20X, PEK_LONG,		2, 0),
> +	INIT_REGMAP_IRQ(AXP20X, N_OE_PWR_ON,		3, 7),
> +	INIT_REGMAP_IRQ(AXP20X, N_OE_PWR_OFF,	        3, 6),
> +	INIT_REGMAP_IRQ(AXP20X, VBUS_VALID,		3, 5),
> +	INIT_REGMAP_IRQ(AXP20X, VBUS_NOT_VALID,	        3, 4),
> +	INIT_REGMAP_IRQ(AXP20X, VBUS_SESS_VALID,	3, 3),
> +	INIT_REGMAP_IRQ(AXP20X, VBUS_SESS_END,	        3, 2),
> +	INIT_REGMAP_IRQ(AXP20X, LOW_PWR_LVL1,	        3, 1),
> +	INIT_REGMAP_IRQ(AXP20X, LOW_PWR_LVL2,	        3, 0),
> +	INIT_REGMAP_IRQ(AXP20X, TIMER,		        4, 7),
> +	INIT_REGMAP_IRQ(AXP20X, PEK_RIS_EDGE,	        4, 6),
> +	INIT_REGMAP_IRQ(AXP20X, PEK_FAL_EDGE,	        4, 5),
> +	INIT_REGMAP_IRQ(AXP20X, GPIO3_INPUT,		4, 3),
> +	INIT_REGMAP_IRQ(AXP20X, GPIO2_INPUT,		4, 2),
> +	INIT_REGMAP_IRQ(AXP20X, GPIO1_INPUT,		4, 1),
> +	INIT_REGMAP_IRQ(AXP20X, GPIO0_INPUT,		4, 0),
> +};
> +
> +/* some IRQs are compatible with axp20x models */
> +static const struct regmap_irq axp288_regmap_irqs[] = {
> +	INIT_REGMAP_IRQ(AXP20X, VBUS_REMOVAL,           0, 2),
> +	INIT_REGMAP_IRQ(AXP20X, VBUS_PLUGIN,            0, 3),
> +	INIT_REGMAP_IRQ(AXP20X, VBUS_OVER_V,            0, 4),
> +
> +	INIT_REGMAP_IRQ(AXP20X, CHARG_DONE,             1, 2),
> +	INIT_REGMAP_IRQ(AXP20X, CHARG,                  1, 3),
> +	INIT_REGMAP_IRQ(AXP288, SAFE_QUIT,              1, 4),
> +	INIT_REGMAP_IRQ(AXP288, SAFE_ENTER,             1, 5),
> +	INIT_REGMAP_IRQ(AXP20X, BATT_REMOVAL,           1, 6),
> +	INIT_REGMAP_IRQ(AXP20X, BATT_PLUGIN,            1, 7),
> +
> +	INIT_REGMAP_IRQ(AXP288, QWBTU,                  2, 0),
> +	INIT_REGMAP_IRQ(AXP288, WBTU,                   2, 1),
> +	INIT_REGMAP_IRQ(AXP288, QWBTO,                  2, 2),
> +	INIT_REGMAP_IRQ(AXP288, WBTU,                   2, 3),
> +	INIT_REGMAP_IRQ(AXP288, QCBTU,                  2, 4),
> +	INIT_REGMAP_IRQ(AXP288, CBTU,                   2, 5),
> +	INIT_REGMAP_IRQ(AXP288, QCBTO,                  2, 6),
> +	INIT_REGMAP_IRQ(AXP288, CBTO,                   2, 7),
> +
> +	INIT_REGMAP_IRQ(AXP288, WL2,                    3, 0),
> +	INIT_REGMAP_IRQ(AXP288, WL1,                    3, 1),
> +	INIT_REGMAP_IRQ(AXP288, GPADC,                  3, 2),
> +	INIT_REGMAP_IRQ(AXP288, OT,                     3, 7),
> +
> +	INIT_REGMAP_IRQ(AXP288, GPIO0,                  4, 0),
> +	INIT_REGMAP_IRQ(AXP288, GPIO1,                  4, 1),
> +	INIT_REGMAP_IRQ(AXP288, POKO,                   4, 2),
> +	INIT_REGMAP_IRQ(AXP288, POKL,                   4, 3),
> +	INIT_REGMAP_IRQ(AXP288, POKS,                   4, 4),
> +	INIT_REGMAP_IRQ(AXP288, POKN,                   4, 5),
> +	INIT_REGMAP_IRQ(AXP288, POKP,                   4, 6),
> +	INIT_REGMAP_IRQ(AXP20X, TIMER,                  4, 7),
> +
> +	INIT_REGMAP_IRQ(AXP288, MV_CHNG,                5, 0),
> +	INIT_REGMAP_IRQ(AXP288, BC_USB_CHNG,            5, 1),
>  };
>  
>  static const struct of_device_id axp20x_of_match[] = {
> @@ -123,19 +233,26 @@ MODULE_DEVICE_TABLE(of, axp20x_of_match);
>  /*
>   * This is useless for OF-enabled devices, but it is needed by I2C subsystem
>   */
> -static const struct i2c_device_id axp20x_i2c_id[] = {
> +static const struct i2c_device_id axp2xx_i2c_id[] = {
>  	{ },
>  };
> -MODULE_DEVICE_TABLE(i2c, axp20x_i2c_id);
> +MODULE_DEVICE_TABLE(i2c, axp2xx_i2c_id);
>  
> -static const struct regmap_irq_chip axp20x_regmap_irq_chip = {
> -	.name			= "axp20x_irq_chip",
> +static struct acpi_device_id axp2xx_acpi_match[] = {
> +	{
> +		.id = "INT33F4",
> +		.driver_data = (kernel_ulong_t)AXP288_ID,
> +	},
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(acpi, axp2xx_acpi_match);
> +
> +/* common irq chip attributes only */
> +static struct regmap_irq_chip axp2xx_regmap_irq_chip = {
> +	.name			= "axp2xx_irq_chip",
>  	.status_base		= AXP20X_IRQ1_STATE,
>  	.ack_base		= AXP20X_IRQ1_STATE,
>  	.mask_base		= AXP20X_IRQ1_EN,
> -	.num_regs		= 5,
> -	.irqs			= axp20x_regmap_irqs,
> -	.num_irqs		= ARRAY_SIZE(axp20x_regmap_irqs),
>  	.mask_invert		= true,
>  	.init_ack_masked	= true,
>  };
> @@ -161,98 +278,223 @@ static struct mfd_cell axp20x_cells[] = {
>  	},
>  };
>  
> -static struct axp20x_dev *axp20x_pm_power_off;
> -static void axp20x_power_off(void)
> +static struct resource axp288_adc_resources[] = {
> +	{
> +		.name	= "GPADC",
> +		.start = AXP288_IRQ_GPADC,
> +		.end   = AXP288_IRQ_GPADC,
> +		.flags = IORESOURCE_IRQ,
> +	},
> +};
> +
> +static struct resource axp288_charger_resources[] = {
> +	{
> +		.start = AXP288_IRQ_OV,
> +		.end   = AXP288_IRQ_OV,
> +		.flags = IORESOURCE_IRQ,
> +	},
> +	{
> +		.start = AXP288_IRQ_DONE,
> +		.end   = AXP288_IRQ_DONE,
> +		.flags = IORESOURCE_IRQ,
> +	},
> +	{
> +		.start = AXP288_IRQ_CHARGING,
> +		.end   = AXP288_IRQ_CHARGING,
> +		.flags = IORESOURCE_IRQ,
> +	},
> +	{
> +		.start = AXP288_IRQ_SAFE_QUIT,
> +		.end   = AXP288_IRQ_SAFE_QUIT,
> +		.flags = IORESOURCE_IRQ,
> +	},
> +	{
> +		.start = AXP288_IRQ_SAFE_ENTER,
> +		.end   = AXP288_IRQ_SAFE_ENTER,
> +		.flags = IORESOURCE_IRQ,
> +	},
> +	{
> +		.start = AXP288_IRQ_QCBTU,
> +		.end   = AXP288_IRQ_QCBTU,
> +		.flags = IORESOURCE_IRQ,
> +	},
> +	{
> +		.start = AXP288_IRQ_CBTU,
> +		.end   = AXP288_IRQ_CBTU,
> +		.flags = IORESOURCE_IRQ,
> +	},
> +	{
> +		.start = AXP288_IRQ_QCBTO,
> +		.end   = AXP288_IRQ_QCBTO,
> +		.flags = IORESOURCE_IRQ,
> +	},
> +	{
> +		.start = AXP288_IRQ_CBTO,
> +		.end   = AXP288_IRQ_CBTO,
> +		.flags = IORESOURCE_IRQ,
> +	},
> +};
> +
> +static struct mfd_cell axp288_cells[] = {
> +	{
> +		.name = "axp288_adc",
> +		.num_resources = ARRAY_SIZE(axp288_adc_resources),
> +		.resources = axp288_adc_resources,
> +	},
> +	{
> +		.name = "axp288_charger",
> +		.num_resources = ARRAY_SIZE(axp288_charger_resources),
> +		.resources = axp288_charger_resources,
> +	},
> +	{
> +		.name = "axp288_battery",
> +		.num_resources = ARRAY_SIZE(axp288_battery_resources),
> +		.resources = axp288_battery_resources,
> +	},
> +	{
> +		.name = "axp288_acpi_opregion",
> +	},
> +};
> +
> +static struct axp2xx_dev *axp2xx_pm_power_off;
> +static void axp2xx_power_off(void)
>  {
> -	regmap_write(axp20x_pm_power_off->regmap, AXP20X_OFF_CTRL,
> +	if (axp2xx_pm_power_off->variant == AXP288_ID)
> +		return;
> +	regmap_write(axp2xx_pm_power_off->regmap, AXP20X_OFF_CTRL,
>  		     AXP20X_OFF);
>  }
>  
> -static int axp20x_i2c_probe(struct i2c_client *i2c,
> -			 const struct i2c_device_id *id)
> +static int axp2xx_match_device(struct axp2xx_dev *axp2xx, struct device *dev)
>  {
> -	struct axp20x_dev *axp20x;
> +	const struct acpi_device_id *acpi_id;
>  	const struct of_device_id *of_id;
> -	int ret;
>  
> -	axp20x = devm_kzalloc(&i2c->dev, sizeof(*axp20x), GFP_KERNEL);
> -	if (!axp20x)
> -		return -ENOMEM;
> +	of_id = of_match_device(axp2xx_of_match, dev);
> +	if (of_id) {
> +		axp2xx->variant = (long) of_id->data;
> +		goto found_match;
> +	}
>  
> -	of_id = of_match_device(axp20x_of_match, &i2c->dev);
> -	if (!of_id) {
> -		dev_err(&i2c->dev, "Unable to setup AXP20X data\n");
> +	acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
> +	if (!acpi_id || !acpi_id->driver_data) {
> +		dev_err(dev, "Unable to setup AXP2XX ACPI data\n");
>  		return -ENODEV;
>  	}
> -	axp20x->variant = (long) of_id->data;
> +	axp2xx->variant = (long) acpi_id->driver_data;

Shouldn't that be in the if statement above? I guess acpi_id will be
null on a DT-based system.

> +
> +found_match:
> +	switch (axp2xx->variant) {
> +	case AXP202_ID:
> +	case AXP209_ID:
> +		dev_dbg(dev, "AXP2xx variant AXP202/209 found\n");
> +		axp2xx_nr_cells = ARRAY_SIZE(axp20x_cells);
> +		axp2xx_cells = axp20x_cells;
> +		regmap_cfg = &axp20x_regmap_config;
> +		axp2xx_regmap_irq_chip.num_regs	= 5;
> +		axp2xx_regmap_irq_chip.irqs = axp20x_regmap_irqs;
> +		axp2xx_regmap_irq_chip.num_irqs	=
> +			ARRAY_SIZE(axp20x_regmap_irqs);
> +		break;
> +	case AXP288_ID:
> +		dev_dbg(dev, "AXP2xx variant AXP288 found\n");
> +		axp2xx_cells = axp288_cells;
> +		axp2xx_nr_cells = ARRAY_SIZE(axp288_cells);
> +		axp2xx_regmap_irq_chip.irqs = axp288_regmap_irqs;
> +		axp2xx_regmap_irq_chip.num_irqs	=
> +			ARRAY_SIZE(axp288_regmap_irqs);
> +		axp2xx_regmap_irq_chip.num_regs	= 6;
> +		regmap_cfg = &axp288_regmap_config;
> +		break;
> +	default:
> +		dev_err(dev, "unsupported AXP2XX ID %lu\n", axp2xx->variant);
> +		return -ENODEV;
> +	}
> +
> +	return 0;
> +}
> +
> +static int axp2xx_i2c_probe(struct i2c_client *i2c,
> +			const struct i2c_device_id *id)
> +{
> +	struct axp2xx_dev *axp2xx;
> +	int ret;
>  
> -	axp20x->i2c_client = i2c;
> -	axp20x->dev = &i2c->dev;
> -	dev_set_drvdata(axp20x->dev, axp20x);
> +	axp2xx = devm_kzalloc(&i2c->dev, sizeof(*axp2xx), GFP_KERNEL);
> +	if (!axp2xx)
> +		return -ENOMEM;
> +
> +	ret = axp2xx_match_device(axp2xx, &i2c->dev);
> +	if (ret)
> +		return ret;
> +	axp2xx->i2c_client = i2c;
> +	axp2xx->dev = &i2c->dev;
> +	dev_set_drvdata(axp2xx->dev, axp2xx);
>  
> -	axp20x->regmap = devm_regmap_init_i2c(i2c, &axp20x_regmap_config);
> -	if (IS_ERR(axp20x->regmap)) {
> -		ret = PTR_ERR(axp20x->regmap);
> +	axp2xx->regmap = devm_regmap_init_i2c(i2c, regmap_cfg);
> +	if (IS_ERR(axp2xx->regmap)) {
> +		ret = PTR_ERR(axp2xx->regmap);
>  		dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
>  		return ret;
>  	}
>  
> -	ret = regmap_add_irq_chip(axp20x->regmap, i2c->irq,
> +	ret = regmap_add_irq_chip(axp2xx->regmap, i2c->irq,
>  				  IRQF_ONESHOT | IRQF_SHARED, -1,
> -				  &axp20x_regmap_irq_chip,
> -				  &axp20x->regmap_irqc);
> +				  &axp2xx_regmap_irq_chip,
> +				  &axp2xx->regmap_irqc);
>  	if (ret) {
>  		dev_err(&i2c->dev, "failed to add irq chip: %d\n", ret);
>  		return ret;
>  	}
>  
> -	ret = mfd_add_devices(axp20x->dev, -1, axp20x_cells,
> -			      ARRAY_SIZE(axp20x_cells), NULL, 0, NULL);
> +	ret = mfd_add_devices(axp2xx->dev, -1, axp2xx_cells,
> +			axp2xx_nr_cells, NULL, 0, NULL);
>  
>  	if (ret) {
>  		dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret);
> -		regmap_del_irq_chip(i2c->irq, axp20x->regmap_irqc);
> +		regmap_del_irq_chip(i2c->irq, axp2xx->regmap_irqc);
>  		return ret;
>  	}
>  
>  	if (!pm_power_off) {
> -		axp20x_pm_power_off = axp20x;
> -		pm_power_off = axp20x_power_off;
> +		axp2xx_pm_power_off = axp2xx;
> +		pm_power_off = axp2xx_power_off;
>  	}
>  
> -	dev_info(&i2c->dev, "AXP20X driver loaded\n");
> +	dev_info(&i2c->dev, "AXP2XX driver loaded\n");
>  
>  	return 0;
>  }
>  
> -static int axp20x_i2c_remove(struct i2c_client *i2c)
> +static int axp2xx_i2c_remove(struct i2c_client *i2c)
>  {
> -	struct axp20x_dev *axp20x = i2c_get_clientdata(i2c);
> +	struct axp2xx_dev *axp2xx = i2c_get_clientdata(i2c);
>  
> -	if (axp20x == axp20x_pm_power_off) {
> -		axp20x_pm_power_off = NULL;
> +	if (axp2xx == axp2xx_pm_power_off) {
> +		axp2xx_pm_power_off = NULL;
>  		pm_power_off = NULL;
>  	}
>  
> -	mfd_remove_devices(axp20x->dev);
> -	regmap_del_irq_chip(axp20x->i2c_client->irq, axp20x->regmap_irqc);
> +	mfd_remove_devices(axp2xx->dev);
> +	regmap_del_irq_chip(axp2xx->i2c_client->irq, axp2xx->regmap_irqc);
>  
>  	return 0;
>  }
>  
> -static struct i2c_driver axp20x_i2c_driver = {
> +static struct i2c_driver axp2xx_i2c_driver = {
>  	.driver = {
> -		.name	= "axp20x",
> +		.name	= "axp2xx",
>  		.owner	= THIS_MODULE,
> -		.of_match_table	= of_match_ptr(axp20x_of_match),
> +		.of_match_table	= of_match_ptr(axp2xx_of_match),
> +		.acpi_match_table = ACPI_PTR(axp2xx_acpi_match),
>  	},
> -	.probe		= axp20x_i2c_probe,
> -	.remove		= axp20x_i2c_remove,
> -	.id_table	= axp20x_i2c_id,
> +	.probe		= axp2xx_i2c_probe,
> +	.remove		= axp2xx_i2c_remove,
> +	.id_table	= axp2xx_i2c_id,
>  };
>  
> -module_i2c_driver(axp20x_i2c_driver);
> +module_i2c_driver(axp2xx_i2c_driver);
>  
> -MODULE_DESCRIPTION("PMIC MFD core driver for AXP20X");
> +MODULE_DESCRIPTION("PMIC MFD core driver for AXP2XX");
>  MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
>  MODULE_LICENSE("GPL");
> diff --git a/include/linux/mfd/axp2xx.h b/include/linux/mfd/axp2xx.h
> index d0e31a2..672f048 100644
> --- a/include/linux/mfd/axp2xx.h
> +++ b/include/linux/mfd/axp2xx.h
> @@ -14,6 +14,8 @@
>  enum {
>  	AXP202_ID = 0,
>  	AXP209_ID,
> +	AXP288_ID,
> +	NR_AXP288_VARIANTS,

Can't that be a more generic name? Something like NR_AXP2XX instead?

Also, could you put me in CC in the later iterations of the patches?

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com