Re: [PATCH v3 1/3] ACPI / PMIC: support PMIC operation region for CrystalCove

[Aaron Lu <aaron.lu@intel.com>]

On 11/24/2014 08:59 AM, Rafael J. Wysocki wrote:
> On Friday, November 21, 2014 03:11:49 PM Aaron Lu wrote:
>> The Baytrail-T platform firmware has defined two customized operation
>> regions for PMIC chip Crystal Cove - one is for power resource handling
>> and one is for thermal: sensor temperature reporting, trip point setting,
>> etc. This patch adds support for them on top of the existing Crystal Cove
>> PMIC driver.
>>
>> The reason to split code into a separate file intel_pmic.c is that there
>> are more PMIC drivers with ACPI operation region support coming and we can
>> re-use those code. The intel_pmic_opregion_data structure is created also
>> for this purpose: when we need to support a new PMIC's operation region,
>> we just need to fill those callbacks and the two register mapping tables.
>>
>> Signed-off-by: Aaron Lu <aaron.lu@intel.com>
>> Acked-by: Lee Jones <lee.jones@linaro.org> for the MFD part
> 
> Thanks for resending, looks better to me.
> 
> Some nitpicking below.

Thaks for taking a look at them, some response below.

> 
>> ---
>>  drivers/acpi/Kconfig               |  17 ++
>>  drivers/acpi/Makefile              |   3 +
>>  drivers/acpi/pmic/intel_pmic.c     | 339 +++++++++++++++++++++++++++++++++++++
>>  drivers/acpi/pmic/intel_pmic.h     |  34 ++++
>>  drivers/acpi/pmic/intel_pmic_crc.c | 216 +++++++++++++++++++++++
>>  drivers/mfd/intel_soc_pmic_crc.c   |   3 +
>>  6 files changed, 612 insertions(+)
>>  create mode 100644 drivers/acpi/pmic/intel_pmic.c
>>  create mode 100644 drivers/acpi/pmic/intel_pmic.h
>>  create mode 100644 drivers/acpi/pmic/intel_pmic_crc.c
>>
>> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
>> index 79078b8f5697..3e5f2056f946 100644
>> --- a/drivers/acpi/Kconfig
>> +++ b/drivers/acpi/Kconfig
>> @@ -393,4 +393,21 @@ config ACPI_EXTLOG
>>  	  driver adds support for that functionality with corresponding
>>  	  tracepoint which carries that information to userspace.
>>  
>> +menuconfig PMIC_OPREGION
>> +	bool "PMIC (Power Management Integrated Circuit) operation region support"
>> +	help
>> +	  Select this option to enable support for ACPI operation
>> +	  region of the PMIC chip. The operation region can be used
>> +	  to control power rails and sensor reading/writing on the
>> +	  PMIC chip.
>> +
>> +if PMIC_OPREGION
>> +config CRC_PMIC_OPREGION
> 
> If that is the only possible choice for PMIC_OPREGION, it should be selected
> automatically.  Alternatively, PMIC_OPREGION should be selected automatically
> if CRC_PMIC_OPREGION is set.

It is not the only possible choice, currently we have two(see patch 2/3):
CRC_PMIC_OPREGION and XPOWER_PMIC_OPREGION. I would assume this is a
increasing list with more and more PMIC opregion support added. I can
use select for PMIC_OPREGION for all those PMIC operation region drivers,
but it seems easier to use a "if PMIC_OPREGION ... endif" between them.
Please let me know if this is OK?

> 
>> +	bool "ACPI operation region support for CrystalCove PMIC"
>> +	depends on INTEL_SOC_PMIC
>> +	help
>> +	  This config adds ACPI operation region support for CrystalCove PMIC.
>> +
>> +endif
>> +
>>  endif	# ACPI
>> diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
>> index 6d11522f0e48..f5938399ac14 100644
>> --- a/drivers/acpi/Makefile
>> +++ b/drivers/acpi/Makefile
>> @@ -88,3 +88,6 @@ obj-$(CONFIG_ACPI_PROCESSOR_AGGREGATOR) += acpi_pad.o
>>  obj-$(CONFIG_ACPI_APEI)		+= apei/
>>  
>>  obj-$(CONFIG_ACPI_EXTLOG)	+= acpi_extlog.o
>> +
>> +obj-$(CONFIG_PMIC_OPREGION)	+= pmic/intel_pmic.o
>> +obj-$(CONFIG_CRC_PMIC_OPREGION) += pmic/intel_pmic_crc.o
>> diff --git a/drivers/acpi/pmic/intel_pmic.c b/drivers/acpi/pmic/intel_pmic.c
>> new file mode 100644
>> index 000000000000..5dbc0fb4d536
>> --- /dev/null
>> +++ b/drivers/acpi/pmic/intel_pmic.c
>> @@ -0,0 +1,339 @@
>> +/*
>> + * intel_pmic.c - Intel PMIC operation region driver
>> + *
>> + * Copyright (C) 2014 Intel Corporation. All rights reserved.
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License version
>> + * 2 as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/module.h>
>> +#include <linux/acpi.h>
>> +#include <linux/regmap.h>
>> +#include "intel_pmic.h"
>> +
>> +#define PMIC_PMOP_OPREGION_ID		0x8d
>> +#define PMIC_THERMAL_OPREGION_ID	0x8c
>> +
>> +struct acpi_lpat {
>> +	int temp;
>> +	int raw;
>> +};
>> +
>> +struct intel_pmic_opregion {
>> +	struct mutex lock;
>> +	struct acpi_lpat *lpat;
>> +	int lpat_count;
>> +	struct regmap *regmap;
>> +	struct intel_pmic_opregion_data *data;
>> +};
>> +
>> +static struct pmic_pwr_reg *
>> +pmic_get_pwr_reg(int address, struct pmic_pwr_table *table, int count)
>> +{
>> +	int i;
>> +
>> +	for (i = 0; i < count; i++) {
>> +		if (table[i].address == address)
>> +			return &table[i].pwr_reg;
>> +	}
>> +	return NULL;
>> +}
>> +
>> +static int
>> +pmic_get_thermal_reg(int address, struct pmic_thermal_table *table, int count)
>> +{
>> +	int i;
>> +
>> +	for (i = 0; i < count; i++) {
>> +		if (table[i].address == address)
>> +			return table[i].reg;
>> +	}
>> +	return -ENOENT;
>> +}
> 
> This is slightly inconsistent.  While pmic_get_pwr_reg() returns a pointer
> to struct pmic_pwr_reg, this one returns an int.
> 
> I see that this is because the definitions of struct pmic_thermal_table
> and struct pmic_pwr_table are inconsistent, but is that really necessary?
> 
> You could define
> 
> struct pmic_table {
> 	int address;	/* operation region address */
> 	int reg;	/* corresponding PMIC register */
> 	int bit;	/* control bit for power */
> };
> 
> and use it for both power and thermal.  [The latter will not use the bit field,
> but is that really a problem?]
> 
> It looks like some code duplication might be reduced this way.

Yes.

> 
> Besides, "power" looks better than "pwr", especially that you use "thermal"
> instead of "thrm" (for example).

OK.

> 
>> +
>> +/* Return temperature from raw value through LPAT table */
>> +static int raw_to_temp(struct acpi_lpat *lpat, int count, int raw)
>> +{
>> +	int i, delta_temp, delta_raw, temp;
>> +
>> +	for (i = 0; i < count - 1; i++) {
>> +		if ((raw >= lpat[i].raw && raw <= lpat[i+1].raw) ||
>> +		    (raw <= lpat[i].raw && raw >= lpat[i+1].raw))
>> +			break;
>> +	}
>> +
>> +	if (i == count - 1)
>> +		return -ENOENT;
>> +
>> +	delta_temp = lpat[i+1].temp - lpat[i].temp;
>> +	delta_raw = lpat[i+1].raw - lpat[i].raw;
>> +	temp = lpat[i].temp + (raw - lpat[i].raw) * delta_temp / delta_raw;
>> +
>> +	return temp;
>> +}
>> +
>> +/* Return raw value from temperature through LPAT table */
>> +static int temp_to_raw(struct acpi_lpat *lpat, int count, int temp)
>> +{
>> +	int i, delta_temp, delta_raw, raw;
>> +
>> +	for (i = 0; i < count - 1; i++) {
>> +		if (temp >= lpat[i].temp && temp <= lpat[i+1].temp)
>> +			break;
>> +	}
>> +
>> +	if (i == count - 1)
>> +		return -ENOENT;
>> +
>> +	delta_temp = lpat[i+1].temp - lpat[i].temp;
>> +	delta_raw = lpat[i+1].raw - lpat[i].raw;
>> +	raw = lpat[i].raw + (temp - lpat[i].temp) * delta_raw / delta_temp;
>> +
>> +	return raw;
>> +}
>> +
>> +static void
>> +pmic_thermal_lpat(struct intel_pmic_opregion *opregion, acpi_handle handle,
>> +		  struct device *dev)
>> +{
>> +	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
>> +	union acpi_object *obj_p, *obj_e;
>> +	int *lpat, i;
>> +	acpi_status status;
>> +
>> +	status = acpi_evaluate_object(handle, "LPAT", NULL, &buffer);
>> +	if (ACPI_FAILURE(status))
>> +		return;
>> +
>> +	obj_p = (union acpi_object *)buffer.pointer;
>> +	if (!obj_p || (obj_p->type != ACPI_TYPE_PACKAGE) ||
>> +	    (obj_p->package.count % 2) || (obj_p->package.count < 4))
>> +		goto out;
>> +
>> +	lpat = devm_kmalloc(dev, sizeof(*lpat) * obj_p->package.count,
>> +			    GFP_KERNEL);
> 
> This looks fishy.
> 
> Of course, sizeof(*lpat) is the same as sizeof(int), but is more obfuscated
> and you're allocating memory for an array of integers.

OK.

> 
>> +	if (!lpat)
>> +		goto out;
>> +
>> +	for (i = 0; i < obj_p->package.count; i++) {
>> +		obj_e = &obj_p->package.elements[i];
>> +		if (obj_e->type != ACPI_TYPE_INTEGER)
> 
> lpat[] has to be freed here.

Oh right.

> 
>> +			goto out;
>> +		lpat[i] = obj_e->integer.value;
> 
> Here, integer.value is generally u64, so I'd use an explicit cast to s64 before
> casting that to int.  Otherwise it looks like you've forgotten about possible
> overflows, which I assume is not the case.

OK.

> 
>> +	}
>> +
>> +	opregion->lpat = (struct acpi_lpat *)lpat;
>> +	opregion->lpat_count = obj_p->package.count / 2;
>> +
>> +out:
>> +	kfree(buffer.pointer);
>> +}
>> +
>> +static acpi_status
>> +intel_pmic_pmop_handler(u32 function, acpi_physical_address address,
>> +			u32 bits, u64 *value64, void *handler_context,
>> +			void *region_context)
>> +{
>> +	struct intel_pmic_opregion *opregion = region_context;
>> +	struct regmap *regmap = opregion->regmap;
>> +	struct intel_pmic_opregion_data *d = opregion->data;
>> +	struct pmic_pwr_reg *preg;
>> +	int result;
>> +
>> +	if (bits != 32 || !value64)
>> +		return AE_BAD_PARAMETER;
>> +
>> +	if (function == ACPI_WRITE && !(*value64 == 0 || *value64 == 1))
>> +		return AE_BAD_PARAMETER;
>> +
>> +	preg = pmic_get_pwr_reg(address, d->pwr_table, d->pwr_table_count);
>> +	if (!preg)
>> +		return AE_BAD_PARAMETER;
>> +
>> +	mutex_lock(&opregion->lock);
>> +
>> +	if (function == ACPI_READ)
>> +		result = d->get_power(regmap, preg, value64);
>> +	else
>> +		result = d->update_power(regmap, preg, *value64 == 1);
> 
> I'd write that as
> 
> 	retult = function == ACPI_READ ?
> 		d->get_power(regmap, preg, value64) :
> 		d->update_power(regmap, preg, *value64 == 1);
> 
> which will be consistent with the "return" statement below.

OK.

> 
>> +
>> +	mutex_unlock(&opregion->lock);
>> +
>> +	return result ? AE_ERROR : AE_OK;
>> +}
>> +
>> +static acpi_status pmic_read_temp(struct intel_pmic_opregion *opregion,
>> +				  int reg, u64 *value)
>> +{
>> +	int raw_temp, temp;
>> +
>> +	if (!opregion->data->get_raw_temp)
>> +		return AE_BAD_PARAMETER;
>> +
>> +	raw_temp = opregion->data->get_raw_temp(opregion->regmap, reg);
>> +	if (raw_temp < 0)
>> +		return AE_ERROR;
>> +
>> +	if (!opregion->lpat) {
>> +		*value = raw_temp;
>> +		return AE_OK;
>> +	}
>> +
>> +	temp = raw_to_temp(opregion->lpat, opregion->lpat_count, raw_temp);
>> +	if (temp < 0)
>> +		return AE_ERROR;
>> +
>> +	*value = temp;
>> +	return AE_OK;
>> +}
>> +
>> +static acpi_status pmic_thermal_temp(struct intel_pmic_opregion *opregion,
>> +				     int reg, u32 function, u64 *value)
>> +{
>> +	if (function != ACPI_READ)
>> +		return AE_BAD_PARAMETER;
>> +
>> +	return pmic_read_temp(opregion, reg, value);
> 
> What about
> 
> 	return function == ACPI_READ ?
> 		pmic_read_temp(opregion, reg, value) : AE_BAD_PARAMETER;
> 
> ?

OK.

> 
>> +}
>> +
>> +static acpi_status pmic_thermal_aux(struct intel_pmic_opregion *opregion,
>> +				    int reg, u32 function, u64 *value)
>> +{
>> +	int raw_temp;
>> +
>> +	if (function == ACPI_READ)
>> +		return pmic_read_temp(opregion, reg, value);
>> +
>> +	if (!opregion->data->update_aux)
>> +		return AE_BAD_PARAMETER;
>> +
>> +	if (opregion->lpat) {
>> +		raw_temp = temp_to_raw(opregion->lpat, opregion->lpat_count,
>> +					 *value);
>> +		if (raw_temp < 0)
>> +			return AE_ERROR;
>> +	} else {
>> +		raw_temp = *value;
>> +	}
>> +
>> +	return opregion->data->update_aux(opregion->regmap, reg, raw_temp) ?
>> +		AE_ERROR : AE_OK;
> 
> You seem to be casting all error codes into AE_ERROR here.  Should the function
> simply return int and pass the original error code to the caller instead?

You mean pass the original error code to intel_pmic_thermal_handler?
Yes, I can do that. But since there isn't a 1-1 mapping between the
standard error code and ACPICA error values, I'm afriad I'll need to
cast them into AE_ERROR in intel_pmic_thermal_handler before return.

> 
>> +}
>> +
>> +static acpi_status pmic_thermal_pen(struct intel_pmic_opregion *opregion,
>> +				    int reg, u32 function, u64 *value)
>> +{
>> +	struct intel_pmic_opregion_data *d = opregion->data;
>> +	struct regmap *regmap = opregion->regmap;
>> +
>> +	if (!d->get_policy || !d->update_policy)
>> +		return AE_BAD_PARAMETER;
>> +
>> +	if (function == ACPI_READ)
>> +		return d->get_policy(regmap, reg, value) ? AE_ERROR : AE_OK;
>> +
>> +	if (*value != 0 || *value != 1)
>> +		return AE_BAD_PARAMETER;
>> +
>> +	return d->update_policy(regmap, reg, *value) ? AE_ERROR : AE_OK;
> 
> Well, same here.
> 
>> +}
>> +
>> +static bool pmic_thermal_is_temp(int address)
>> +{
>> +	return (address <= 0x3c) && !(address % 12);
>> +}
>> +
>> +static bool pmic_thermal_is_aux(int address)
>> +{
>> +	return (address >= 4 && address <= 0x40 && !((address - 4) % 12)) ||
>> +	       (address >= 8 && address <= 0x44 && !((address - 8) % 12));
>> +}
>> +
>> +static bool pmic_thermal_is_pen(int address)
>> +{
>> +	return address >= 0x48 && address <= 0x5c;
>> +}
>> +
>> +static acpi_status
>> +intel_pmic_thermal_handler(u32 function, acpi_physical_address address,
>> +			   u32 bits, u64 *value64, void *handler_context,
>> +			   void *region_context)
>> +{
>> +	struct intel_pmic_opregion *opregion = region_context;
>> +	int reg;
>> +	int result;
>> +
>> +	if (bits != 32 || !value64)
>> +		return AE_BAD_PARAMETER;
>> +
>> +	reg = pmic_get_thermal_reg(address, opregion->data->thermal_table,
>> +				   opregion->data->thermal_table_count);
>> +	if (!reg)
>> +		return AE_BAD_PARAMETER;
>> +
>> +	mutex_lock(&opregion->lock);
>> +
>> +	result = AE_BAD_PARAMETER;
>> +	if (pmic_thermal_is_temp(address))
>> +		result = pmic_thermal_temp(opregion, reg, function, value64);
>> +	else if (pmic_thermal_is_aux(address))
>> +		result = pmic_thermal_aux(opregion, reg, function, value64);
>> +	else if (pmic_thermal_is_pen(address))
>> +		result = pmic_thermal_pen(opregion, reg, function, value64);
>> +
>> +	mutex_unlock(&opregion->lock);
>> +
>> +	return result;
>> +}
>> +
>> +int intel_pmic_install_opregion_handler(struct device *dev, acpi_handle handle,
>> +					struct regmap *regmap,
>> +					struct intel_pmic_opregion_data *d)
>> +{
>> +	acpi_status status;
>> +	struct intel_pmic_opregion *opregion;
>> +
>> +	if (!dev || !regmap || !d)
>> +		return -EINVAL;
>> +
>> +	if (!handle)
>> +		return -ENODEV;
>> +
>> +	opregion = devm_kzalloc(dev, sizeof(*opregion), GFP_KERNEL);
>> +	if (!opregion)
>> +		return -ENOMEM;
>> +
>> +	mutex_init(&opregion->lock);
>> +	opregion->regmap = regmap;
>> +	pmic_thermal_lpat(opregion, handle, dev);
>> +
>> +	status = acpi_install_address_space_handler(handle,
>> +						    PMIC_PMOP_OPREGION_ID,
>> +						    intel_pmic_pmop_handler,
>> +						    NULL, opregion);
>> +	if (ACPI_FAILURE(status))
>> +		return -ENODEV;
> 
> And you return a int from here.

I prefer to use int whenever possible, i.e. if the function is not
returning a value to a ACPICA function, I'll use int as the return value
instead of acpi_status.

> 
> Would it make sense for the majority of functions in this file to return ints
> rather than acpi_status values?

Yes, I think I can do that. Then I just need to do one cast in the
operation region handler function for those error return values.

> 
>> +
>> +	status = acpi_install_address_space_handler(handle,
>> +						    PMIC_THERMAL_OPREGION_ID,
>> +						    intel_pmic_thermal_handler,
>> +						    NULL, opregion);
>> +	if (ACPI_FAILURE(status)) {
>> +		acpi_remove_address_space_handler(handle, PMIC_PMOP_OPREGION_ID,
>> +						  intel_pmic_pmop_handler);
>> +		return -ENODEV;
>> +	}
>> +
>> +	opregion->data = d;
> 
> I guess the opregion will never be removed, right?

Once installed properly, it will not be removed.

> 
>> +	return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(intel_pmic_install_opregion_handler);
>> +
>> +MODULE_LICENSE("GPL");
>> diff --git a/drivers/acpi/pmic/intel_pmic.h b/drivers/acpi/pmic/intel_pmic.h
>> new file mode 100644
>> index 000000000000..18b9bb80f8b6
>> --- /dev/null
>> +++ b/drivers/acpi/pmic/intel_pmic.h
>> @@ -0,0 +1,34 @@
>> +#ifndef __INTEL_PMIC_H
>> +#define __INTEL_PMIC_H
>> +
>> +struct pmic_pwr_reg {
>> +	int reg;	/* corresponding PMIC register */
>> +	int bit;	/* control bit for power */
>> +};
>> +
>> +struct pmic_pwr_table {
>> +	int address;	/* operation region address */
>> +	struct pmic_pwr_reg pwr_reg;
>> +};
>> +
>> +struct pmic_thermal_table {
>> +	int address;	/* operation region address */
>> +	int reg;	/* corresponding thermal register */
>> +};
>> +
>> +struct intel_pmic_opregion_data {
>> +	int (*get_power)(struct regmap *r, struct pmic_pwr_reg *preg, u64 *value);
>> +	int (*update_power)(struct regmap *r, struct pmic_pwr_reg *preg, bool on);
>> +	int (*get_raw_temp)(struct regmap *r, int reg);
>> +	int (*update_aux)(struct regmap *r, int reg, int raw_temp);
>> +	int (*get_policy)(struct regmap *r, int reg, u64 *value);
>> +	int (*update_policy)(struct regmap *r, int reg, int enable);
>> +	struct pmic_pwr_table *pwr_table;
>> +	int pwr_table_count;
>> +	struct pmic_thermal_table *thermal_table;
>> +	int thermal_table_count;
>> +};
>> +
>> +int intel_pmic_install_opregion_handler(struct device *dev, acpi_handle handle, struct regmap *regmap, struct intel_pmic_opregion_data *d);
>> +
>> +#endif
>> diff --git a/drivers/acpi/pmic/intel_pmic_crc.c b/drivers/acpi/pmic/intel_pmic_crc.c
>> new file mode 100644
>> index 000000000000..7629f16d1526
>> --- /dev/null
>> +++ b/drivers/acpi/pmic/intel_pmic_crc.c
>> @@ -0,0 +1,216 @@
>> +/*
>> + * intel_pmic_crc.c - Intel CrystalCove PMIC operation region driver
>> + *
>> + * Copyright (C) 2014 Intel Corporation. All rights reserved.
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License version
>> + * 2 as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/module.h>
>> +#include <linux/acpi.h>
>> +#include <linux/mfd/intel_soc_pmic.h>
>> +#include <linux/regmap.h>
>> +#include <linux/platform_device.h>
>> +#include "intel_pmic.h"
>> +
>> +#define PWR_SOURCE_SELECT	BIT(1)
>> +
>> +#define PMIC_A0LOCK_REG		0xc5
>> +
>> +static struct pmic_pwr_table pwr_table[] = {
>> +	{
>> +		.address = 0x24,
>> +		.pwr_reg = {
>> +			.reg = 0x66,
>> +			.bit = 0x00,
>> +		},
>> +	},	/* X285 -> V2P85SX, camara */
>> +	{
>> +		.address = 0x48,
>> +		.pwr_reg = {
>> +			.reg = 0x5d,
>> +			.bit = 0x00,
>> +		},
>> +	},	/* V18X -> V1P8SX, eMMC/camara/audio */
>> +};
>> +
>> +static struct pmic_thermal_table thermal_table[] = {
>> +	{
>> +		.address = 0x00,
>> +		.reg = 0x75
>> +	},	/* TMP0 -> SYS0_THRM_RSLT_L */
>> +	{
>> +		.address = 0x04,
>> +		.reg = 0x95
>> +	},	/* AX00 -> SYS0_THRMALRT0_L */
>> +	{
>> +		.address = 0x08,
>> +		.reg = 0x97
>> +	},	/* AX01 -> SYS0_THRMALRT1_L */
>> +	{
>> +		.address = 0x0c,
>> +		.reg = 0x77
>> +	},	/* TMP1 -> SYS1_THRM_RSLT_L */
>> +	{
>> +		.address = 0x10,
>> +		.reg = 0x9a
>> +	},	/* AX10 -> SYS1_THRMALRT0_L */
>> +	{
>> +		.address = 0x14,
>> +		.reg = 0x9c
>> +	},	/* AX11 -> SYS1_THRMALRT1_L */
>> +	{
>> +		.address = 0x18,
>> +		.reg = 0x79
>> +	},	/* TMP2 -> SYS2_THRM_RSLT_L */
>> +	{
>> +		.address = 0x1c,
>> +		.reg = 0x9f
>> +	},	/* AX20 -> SYS2_THRMALRT0_L */
>> +	{
>> +		.address = 0x20,
>> +		.reg = 0xa1
>> +	},	/* AX21 -> SYS2_THRMALRT1_L */
>> +	{
>> +		.address = 0x48,
>> +		.reg = 0x94
>> +	},	/* PEN0 -> SYS0_THRMALRT0_H */
>> +	{
>> +		.address = 0x4c,
>> +		.reg = 0x99
>> +	},	/* PEN1 -> SYS1_THRMALRT1_H */
>> +	{
>> +		.address = 0x50,
>> +		.reg = 0x9e
>> +	},	/* PEN2 -> SYS2_THRMALRT2_H */
>> +};
>> +
>> +static int intel_crc_pmic_get_power(struct regmap *regmap,
>> +				    struct pmic_pwr_reg *preg, u64 *value)
>> +{
>> +	int data;
>> +
>> +	if (regmap_read(regmap, preg->reg, &data))
>> +		return -EIO;
>> +
>> +	*value = (data & PWR_SOURCE_SELECT) && (data & BIT(preg->bit)) ? 1 : 0;
>> +	return 0;
>> +}
>> +
>> +static int intel_crc_pmic_update_power(struct regmap *regmap,
>> +				       struct pmic_pwr_reg *preg, bool on)
>> +{
>> +	int data;
>> +
>> +	if (regmap_read(regmap, preg->reg, &data))
>> +		return -EIO;
>> +
>> +	if (on) {
>> +		data |= PWR_SOURCE_SELECT | BIT(preg->bit);
>> +	} else {
>> +		data &= ~BIT(preg->bit);
>> +		data |= PWR_SOURCE_SELECT;
>> +	}
>> +
>> +	if (regmap_write(regmap, preg->reg, data))
>> +		return -EIO;
>> +	return 0;
>> +}
>> +
>> +/* Raw temperature value is 10bits: 8bits in reg and 2bits in reg-1 bit0,1 */
> 
> Proper kerneldoc, please.  Here and elsewhere where it makes sense.
> 
> All functions that aren't static need to have kerneldoc comments.

Will do that.

> 
>> +static int intel_crc_pmic_get_raw_temp(struct regmap *regmap, int reg)
>> +{
>> +	int temp_l, temp_h;
>> +
>> +	if (regmap_read(regmap, reg, &temp_l) ||
>> +	    regmap_read(regmap, reg - 1, &temp_h))
>> +		return -EIO;
>> +
>> +	return (temp_l | ((temp_h & 0x3) << 8));
> 
> At least one paren is not necessary here.
> 
>> +}
>> +
>> +static int
>> +intel_crc_pmic_update_aux(struct regmap *regmap, int reg, int raw)
>> +{
>> +	if (regmap_write(regmap, reg, raw) ||
>> +	    regmap_update_bits(regmap, reg - 1, 0x3, raw >> 8))
>> +		return -EIO;
>> +
>> +	return 0;
> 
> What about
> 
> 	return regmap_write(regmap, reg, raw) ||
> 		regmap_update_bits(regmap, reg - 1, 0x3, raw >> 8) ? -EIO : 0;

OK.

> 
>> +}
>> +
>> +static int
>> +intel_crc_pmic_get_policy(struct regmap *regmap, int reg, u64 *value)
>> +{
>> +	int pen;
>> +
>> +	if (regmap_read(regmap, reg, &pen))
>> +		return -EIO;
>> +	*value = pen >> 7;
>> +	return 0;
>> +}
>> +
>> +static int intel_crc_pmic_update_policy(struct regmap *regmap,
>> +					int reg, int enable)
>> +{
>> +	int alert0;
>> +
>> +	/* Update to policy enable bit requires unlocking a0lock */
>> +	if (regmap_read(regmap, PMIC_A0LOCK_REG, &alert0))
>> +		return -EIO;
> 
> Empty line here?

OK.

Thanks a lot for the review.

-Aaron

> 
>> +	if (regmap_update_bits(regmap, PMIC_A0LOCK_REG, 0x01, 0))
>> +		return -EIO;
>> +
>> +	if (regmap_update_bits(regmap, reg, 0x80, enable << 7))
>> +		return -EIO;
>> +
>> +	/* restore alert0 */
>> +	if (regmap_write(regmap, PMIC_A0LOCK_REG, alert0))
>> +		return -EIO;
>> +
>> +	return 0;
>> +}
>> +
>> +static struct intel_pmic_opregion_data intel_crc_pmic_opregion_data = {
>> +	.get_power	= intel_crc_pmic_get_power,
>> +	.update_power	= intel_crc_pmic_update_power,
>> +	.get_raw_temp	= intel_crc_pmic_get_raw_temp,
>> +	.update_aux	= intel_crc_pmic_update_aux,
>> +	.get_policy	= intel_crc_pmic_get_policy,
>> +	.update_policy	= intel_crc_pmic_update_policy,
>> +	.pwr_table	= pwr_table,
>> +	.pwr_table_count= ARRAY_SIZE(pwr_table),
>> +	.thermal_table	= thermal_table,
>> +	.thermal_table_count = ARRAY_SIZE(thermal_table),
>> +};
>> +
>> +static int intel_crc_pmic_opregion_probe(struct platform_device *pdev)
>> +{
>> +	struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
>> +	return intel_pmic_install_opregion_handler(&pdev->dev,
>> +			ACPI_HANDLE(pdev->dev.parent), pmic->regmap,
>> +			&intel_crc_pmic_opregion_data);
>> +}
>> +
>> +static struct platform_driver intel_crc_pmic_opregion_driver = {
>> +	.probe = intel_crc_pmic_opregion_probe,
>> +	.driver = {
>> +		.name = "crystal_cove_region",
>> +	},
>> +};
>> +
>> +static int __init intel_crc_pmic_opregion_driver_init(void)
>> +{
>> +	return platform_driver_register(&intel_crc_pmic_opregion_driver);
>> +}
>> +module_init(intel_crc_pmic_opregion_driver_init);
>> +
>> +MODULE_DESCRIPTION("CrystalCove ACPI opration region driver");
>> +MODULE_LICENSE("GPL");
>> diff --git a/drivers/mfd/intel_soc_pmic_crc.c b/drivers/mfd/intel_soc_pmic_crc.c
>> index 7107cab832e6..48845d636bba 100644
>> --- a/drivers/mfd/intel_soc_pmic_crc.c
>> +++ b/drivers/mfd/intel_soc_pmic_crc.c
>> @@ -106,6 +106,9 @@ static struct mfd_cell crystal_cove_dev[] = {
>>  		.num_resources = ARRAY_SIZE(gpio_resources),
>>  		.resources = gpio_resources,
>>  	},
>> +	{
>> +		.name = "crystal_cove_region",
>> +	},
>>  };
>>  
>>  static struct regmap_config crystal_cove_regmap_config = {
>>
>