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SubjectRe: [PATCH v3 1/3] ACPI / PMIC: support PMIC operation region for CrystalCove
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 = {
>>
>



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