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hwmon: (pmbus) Add support for MPS Multi-phase mp2975 controller 

Add support for mp295 device from Monolithic Power Systems, Inc. (MPS)
vendor. This is a dual-loop, digital, multi-phase controller.
This device:
- Supports two power rail.
- Provides 8 pulse-width modulations (PWMs), and can be configured up
  to 8-phase operation for rail 1 and up to 4-phase operation for rail
  2.
- Supports two pages 0 and 1 for telemetry and also pages 2 and 3 for
  configuration.
- Can configured VOUT readout in direct or VID format and allows
  setting of different formats on rails 1 and 2. For VID the following
  protocols are available: VR13 mode with 5-mV DAC; VR13 mode with
  10-mV DAC, IMVP9 mode with 5-mV DAC.

Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
Link: https://lore.kernel.org/r/20200926204957.10268-2-vadimp@nvidia.com
[groeck: Cleaned up a couple of error returns; fixed up API changes]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Vadim Pasternak 2020-09-26 23:49:56 +03:00 committed by Guenter Roeck
parent c073292b16
commit 2c6fcbb211
4 changed files with 895 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

116
Documentation/hwmon/mp2975.rst Normal file
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@ -0,0 +1,116 @@
.. SPDX-License-Identifier: GPL-2.0
Kernel driver mp2975
====================
Supported chips:
* MPS MP12254
Prefix: 'mp2975'
Author:
Vadim Pasternak <vadimp@nvidia.com>
Description
-----------
This driver implements support for Monolithic Power Systems, Inc. (MPS)
vendor dual-loop, digital, multi-phase controller MP2975.
This device:
- Supports up to two power rail.
- Provides 8 pulse-width modulations (PWMs), and can be configured up
to 8-phase operation for rail 1 and up to 4-phase operation for rail
2.
- Supports two pages 0 and 1 for telemetry and also pages 2 and 3 for
configuration.
- Can configured VOUT readout in direct or VID format and allows
setting of different formats on rails 1 and 2. For VID the following
protocols are available: VR13 mode with 5-mV DAC; VR13 mode with
10-mV DAC, IMVP9 mode with 5-mV DAC.
Device supports:
- SVID interface.
- AVSBus interface.
Device complaint with:
- PMBus rev 1.3 interface.
Device supports direct format for reading output current, output voltage,
input and output power and temperature.
Device supports linear format for reading input voltage and input power.
Device supports VID and direct formats for reading output voltage.
The below VID modes are supported: VR12, VR13, IMVP9.
The driver provides the next attributes for the current:
- for current in: input, maximum alarm;
- for current out input, maximum alarm and highest values;
- for phase current: input and label.
attributes.
The driver exports the following attributes via the 'sysfs' files, where
- 'n' is number of telemetry pages (from 1 to 2);
- 'k' is number of configured phases (from 1 to 8);
- indexes 1, 1*n for "iin";
- indexes n+1, n+2 for "iout";
- indexes 2*n+1 ... 2*n + k for phases.
**curr[1-{2n}]_alarm**
**curr[{n+1}-{n+2}]_highest**
**curr[1-{2n+k}]_input**
**curr[1-{2n+k}]_label**
The driver provides the next attributes for the voltage:
- for voltage in: input, high critical threshold, high critical alarm, all only
from page 0;
- for voltage out: input, low and high critical thresholds, low and high
critical alarms, from pages 0 and 1;
The driver exports the following attributes via the 'sysfs' files, where
- 'n' is number of telemetry pages (from 1 to 2);
- indexes 1 for "iin";
- indexes n+1, n+2 for "vout";
**in[1-{2n+1}]_crit**
**in[1-{2n+1}]_crit_alarm**
**in[1-{2n+1}]_input**
**in[1-{2n+1}]_label**
**in[2-{n+1}]_lcrit**
**in[2-{n+1}1_lcrit_alarm**
The driver provides the next attributes for the power:
- for power in alarm and input.
- for power out: highest and input.
The driver exports the following attributes via the 'sysfs' files, where
- 'n' is number of telemetry pages (from 1 to 2);
- indexes 1 for "pin";
- indexes n+1, n+2 for "pout";
**power1_alarm**
**power[2-{n+1}]_highest**
**power[1-{2n+1}]_input**
**power[1-{2n+1}]_label**
The driver provides the next attributes for the temperature (only from page 0):
**temp1_crit**
**temp1_crit_alarm**
**temp1_input**
**temp1_max**
**temp1_max_alarm**

9
drivers/hwmon/pmbus/Kconfig
View File

@ -211,6 +211,15 @@ config SENSORS_MAX8688
This driver can also be built as a module. If so, the module will
be called max8688.
config SENSORS_MP2975
tristate "MPS MP2975"
help
If you say yes here you get hardware monitoring support for MPS
MP2975 Dual Loop Digital Multi-Phase Controller.
This driver can also be built as a module. If so, the module will
be called mp2975.
config SENSORS_PXE1610
tristate "Infineon PXE1610"
help

1
drivers/hwmon/pmbus/Makefile
View File

@ -24,6 +24,7 @@ obj-$(CONFIG_SENSORS_MAX20751) += max20751.o
obj-$(CONFIG_SENSORS_MAX31785) += max31785.o
obj-$(CONFIG_SENSORS_MAX34440) += max34440.o
obj-$(CONFIG_SENSORS_MAX8688) += max8688.o
obj-$(CONFIG_SENSORS_MP2975) += mp2975.o
obj-$(CONFIG_SENSORS_PXE1610) += pxe1610.o
obj-$(CONFIG_SENSORS_TPS40422) += tps40422.o
obj-$(CONFIG_SENSORS_TPS53679) += tps53679.o

769
drivers/hwmon/pmbus/mp2975.c Normal file
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@ -0,0 +1,769 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Hardware monitoring driver for MPS Multi-phase Digital VR Controllers
*
* Copyright (C) 2020 Nvidia Technologies Ltd.
*/
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include "pmbus.h"
/* Vendor specific registers. */
#define MP2975_MFR_APS_HYS_R2 0x0d
#define MP2975_MFR_SLOPE_TRIM3 0x1d
#define MP2975_MFR_VR_MULTI_CONFIG_R1 0x0d
#define MP2975_MFR_VR_MULTI_CONFIG_R2 0x1d
#define MP2975_MFR_APS_DECAY_ADV 0x56
#define MP2975_MFR_DC_LOOP_CTRL 0x59
#define MP2975_MFR_OCP_UCP_PHASE_SET 0x65
#define MP2975_MFR_VR_CONFIG1 0x68
#define MP2975_MFR_READ_CS1_2 0x82
#define MP2975_MFR_READ_CS3_4 0x83
#define MP2975_MFR_READ_CS5_6 0x84
#define MP2975_MFR_READ_CS7_8 0x85
#define MP2975_MFR_READ_CS9_10 0x86
#define MP2975_MFR_READ_CS11_12 0x87
#define MP2975_MFR_READ_IOUT_PK 0x90
#define MP2975_MFR_READ_POUT_PK 0x91
#define MP2975_MFR_READ_VREF_R1 0xa1
#define MP2975_MFR_READ_VREF_R2 0xa3
#define MP2975_MFR_OVP_TH_SET 0xe5
#define MP2975_MFR_UVP_SET 0xe6
#define MP2975_VOUT_FORMAT BIT(15)
#define MP2975_VID_STEP_SEL_R1 BIT(4)
#define MP2975_IMVP9_EN_R1 BIT(13)
#define MP2975_VID_STEP_SEL_R2 BIT(3)
#define MP2975_IMVP9_EN_R2 BIT(12)
#define MP2975_PRT_THRES_DIV_OV_EN BIT(14)
#define MP2975_DRMOS_KCS GENMASK(13, 12)
#define MP2975_PROT_DEV_OV_OFF 10
#define MP2975_PROT_DEV_OV_ON 5
#define MP2975_SENSE_AMPL BIT(11)
#define MP2975_SENSE_AMPL_UNIT 1
#define MP2975_SENSE_AMPL_HALF 2
#define MP2975_VIN_UV_LIMIT_UNIT 8
#define MP2975_MAX_PHASE_RAIL1 8
#define MP2975_MAX_PHASE_RAIL2 4
#define MP2975_PAGE_NUM 2
#define MP2975_RAIL2_FUNC (PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | \
PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | \
PMBUS_PHASE_VIRTUAL)
struct mp2975_data {
struct pmbus_driver_info info;
int vout_scale;
int vid_step[MP2975_PAGE_NUM];
int vref[MP2975_PAGE_NUM];
int vref_off[MP2975_PAGE_NUM];
int vout_max[MP2975_PAGE_NUM];
int vout_ov_fixed[MP2975_PAGE_NUM];
int vout_format[MP2975_PAGE_NUM];
int curr_sense_gain[MP2975_PAGE_NUM];
};
#define to_mp2975_data(x) container_of(x, struct mp2975_data, info)
static int mp2975_read_byte_data(struct i2c_client *client, int page, int reg)
{
switch (reg) {
case PMBUS_VOUT_MODE:
/*
* Enforce VOUT direct format, since device allows to set the
* different formats for the different rails. Conversion from
* VID to direct provided by driver internally, in case it is
* necessary.
*/
return PB_VOUT_MODE_DIRECT;
default:
return -ENODATA;
}
}
static int
mp2975_read_word_helper(struct i2c_client *client, int page, int phase, u8 reg,
u16 mask)
{
int ret = pmbus_read_word_data(client, page, phase, reg);
return (ret > 0) ? ret & mask : ret;
}
static int
mp2975_vid2direct(int vrf, int val)
{
switch (vrf) {
case vr12:
if (val >= 0x01)
return 250 + (val - 1) * 5;
break;
case vr13:
if (val >= 0x01)
return 500 + (val - 1) * 10;
break;
case imvp9:
if (val >= 0x01)
return 200 + (val - 1) * 10;
break;
default:
return -EINVAL;
}
return 0;
}
static int
mp2975_read_phase(struct i2c_client *client, struct mp2975_data *data,
int page, int phase, u8 reg)
{
int ph_curr, ret;
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
if (!((phase + 1) % MP2975_PAGE_NUM))
ret >>= 8;
ret &= 0xff;
/*
* Output value is calculated as: (READ_CSx / 80 – 1.23) / (Kcs * Rcs)
* where:
* - Kcs is the DrMOS current sense gain of power stage, which is
* obtained from the register MP2975_MFR_VR_CONFIG1, bits 13-12 with
* the following selection of DrMOS (data->curr_sense_gain[page]):
* 00b - 5µA/A, 01b - 8.5µA/A, 10b - 9.7µA/A, 11b - 10µA/A.
* - Rcs is the internal phase current sense resistor which is constant
* value 1kΩ.
*/
ph_curr = ret * 100 - 9800;
/*
* Current phase sensing, providing by the device is not accurate
* for the light load. This because sampling of current occurrence of
* bit weight has a big deviation for light load. For handling such
* case phase current is represented as the maximum between the value
* calculated above and total rail current divided by number phases.
*/
ret = pmbus_read_word_data(client, page, phase, PMBUS_READ_IOUT);
if (ret < 0)
return ret;
return max_t(int, DIV_ROUND_CLOSEST(ret, data->info.phases[page]),
DIV_ROUND_CLOSEST(ph_curr, data->curr_sense_gain[page]));
}
static int
mp2975_read_phases(struct i2c_client *client, struct mp2975_data *data,
int page, int phase)
{
int ret;
if (page) {
switch (phase) {
case 0 ... 1:
ret = mp2975_read_phase(client, data, page, phase,
MP2975_MFR_READ_CS7_8);
break;
case 2 ... 3:
ret = mp2975_read_phase(client, data, page, phase,
MP2975_MFR_READ_CS9_10);
break;
case 4 ... 5:
ret = mp2975_read_phase(client, data, page, phase,
MP2975_MFR_READ_CS11_12);
break;
default:
return -ENODATA;
}
} else {
switch (phase) {
case 0 ... 1:
ret = mp2975_read_phase(client, data, page, phase,
MP2975_MFR_READ_CS1_2);
break;
case 2 ... 3:
ret = mp2975_read_phase(client, data, page, phase,
MP2975_MFR_READ_CS3_4);
break;
case 4 ... 5:
ret = mp2975_read_phase(client, data, page, phase,
MP2975_MFR_READ_CS5_6);
break;
case 6 ... 7:
ret = mp2975_read_phase(client, data, page, phase,
MP2975_MFR_READ_CS7_8);
break;
case 8 ... 9:
ret = mp2975_read_phase(client, data, page, phase,
MP2975_MFR_READ_CS9_10);
break;
case 10 ... 11:
ret = mp2975_read_phase(client, data, page, phase,
MP2975_MFR_READ_CS11_12);
break;
default:
return -ENODATA;
}
}
return ret;
}
static int mp2975_read_word_data(struct i2c_client *client, int page,
int phase, int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
struct mp2975_data *data = to_mp2975_data(info);
int ret;
switch (reg) {
case PMBUS_OT_FAULT_LIMIT:
ret = mp2975_read_word_helper(client, page, phase, reg,
GENMASK(7, 0));
break;
case PMBUS_VIN_OV_FAULT_LIMIT:
ret = mp2975_read_word_helper(client, page, phase, reg,
GENMASK(7, 0));
if (ret < 0)
return ret;
ret = DIV_ROUND_CLOSEST(ret, MP2975_VIN_UV_LIMIT_UNIT);
break;
case PMBUS_VOUT_OV_FAULT_LIMIT:
/*
* Register provides two values for over-voltage protection
* threshold for fixed (ovp2) and tracking (ovp1) modes. The
* minimum of these two values is provided as over-voltage
* fault alarm.
*/
ret = mp2975_read_word_helper(client, page, phase,
MP2975_MFR_OVP_TH_SET,
GENMASK(2, 0));
if (ret < 0)
return ret;
ret = min_t(int, data->vout_max[page] + 50 * (ret + 1),
data->vout_ov_fixed[page]);
break;
case PMBUS_VOUT_UV_FAULT_LIMIT:
ret = mp2975_read_word_helper(client, page, phase,
MP2975_MFR_UVP_SET,
GENMASK(2, 0));
if (ret < 0)
return ret;
ret = DIV_ROUND_CLOSEST(data->vref[page] * 10 - 50 *
(ret + 1) * data->vout_scale, 10);
break;
case PMBUS_READ_VOUT:
ret = mp2975_read_word_helper(client, page, phase, reg,
GENMASK(11, 0));
if (ret < 0)
return ret;
/*
* READ_VOUT can be provided in VID or direct format. The
* format type is specified by bit 15 of the register
* MP2975_MFR_DC_LOOP_CTRL. The driver enforces VOUT direct
* format, since device allows to set the different formats for
* the different rails and also all VOUT limits registers are
* provided in a direct format. In case format is VID - convert
* to direct.
*/
if (data->vout_format[page] == vid)
ret = mp2975_vid2direct(info->vrm_version[page], ret);
break;
case PMBUS_VIRT_READ_POUT_MAX:
ret = mp2975_read_word_helper(client, page, phase,
MP2975_MFR_READ_POUT_PK,
GENMASK(12, 0));
if (ret < 0)
return ret;
ret = DIV_ROUND_CLOSEST(ret, 4);
break;
case PMBUS_VIRT_READ_IOUT_MAX:
ret = mp2975_read_word_helper(client, page, phase,
MP2975_MFR_READ_IOUT_PK,
GENMASK(12, 0));
if (ret < 0)
return ret;
ret = DIV_ROUND_CLOSEST(ret, 4);
break;
case PMBUS_READ_IOUT:
ret = mp2975_read_phases(client, data, page, phase);
if (ret < 0)
return ret;
break;
case PMBUS_UT_WARN_LIMIT:
case PMBUS_UT_FAULT_LIMIT:
case PMBUS_VIN_UV_WARN_LIMIT:
case PMBUS_VIN_UV_FAULT_LIMIT:
case PMBUS_VOUT_UV_WARN_LIMIT:
case PMBUS_VOUT_OV_WARN_LIMIT:
case PMBUS_VIN_OV_WARN_LIMIT:
case PMBUS_IIN_OC_FAULT_LIMIT:
case PMBUS_IOUT_OC_LV_FAULT_LIMIT:
case PMBUS_IIN_OC_WARN_LIMIT:
case PMBUS_IOUT_OC_WARN_LIMIT:
case PMBUS_IOUT_OC_FAULT_LIMIT:
case PMBUS_IOUT_UC_FAULT_LIMIT:
case PMBUS_POUT_OP_FAULT_LIMIT:
case PMBUS_POUT_OP_WARN_LIMIT:
case PMBUS_PIN_OP_WARN_LIMIT:
return -ENXIO;
default:
return -ENODATA;
}
return ret;
}
static int mp2975_identify_multiphase_rail2(struct i2c_client *client)
{
int ret;
/*
* Identify multiphase for rail 2 - could be from 0 to 4.
* In case phase number is zero – only page zero is supported
*/
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 2);
if (ret < 0)
return ret;
/* Identify multiphase for rail 2 - could be from 0 to 4. */
ret = i2c_smbus_read_word_data(client, MP2975_MFR_VR_MULTI_CONFIG_R2);
if (ret < 0)
return ret;
ret &= GENMASK(2, 0);
return (ret >= 4) ? 4 : ret;
}
static void mp2975_set_phase_rail1(struct pmbus_driver_info *info)
{
int i;
for (i = 0 ; i < info->phases[0]; i++)
info->pfunc[i] = PMBUS_HAVE_IOUT;
}
static void
mp2975_set_phase_rail2(struct pmbus_driver_info *info, int num_phases)
{
int i;
/* Set phases for rail 2 from upper to lower. */
for (i = 1; i <= num_phases; i++)
info->pfunc[MP2975_MAX_PHASE_RAIL1 - i] = PMBUS_HAVE_IOUT;
}
static int
mp2975_identify_multiphase(struct i2c_client *client, struct mp2975_data *data,
struct pmbus_driver_info *info)
{
int num_phases2, ret;
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 2);
if (ret < 0)
return ret;
/* Identify multiphase for rail 1 - could be from 1 to 8. */
ret = i2c_smbus_read_word_data(client, MP2975_MFR_VR_MULTI_CONFIG_R1);
if (ret <= 0)
return ret;
info->phases[0] = ret & GENMASK(3, 0);
/*
* The device provides a total of 8 PWM pins, and can be configured
* to different phase count applications for rail 1 and rail 2.
* Rail 1 can be set to 8 phases, while rail 2 can only be set to 4
* phases at most. When rail 1’s phase count is configured as 0, rail
* 1 operates with 1-phase DCM. When rail 2 phase count is configured
* as 0, rail 2 is disabled.
*/
if (info->phases[0] > MP2975_MAX_PHASE_RAIL1)
return -EINVAL;
mp2975_set_phase_rail1(info);
num_phases2 = min(MP2975_MAX_PHASE_RAIL1 - info->phases[0],
MP2975_MAX_PHASE_RAIL2);
if (info->phases[1] && info->phases[1] <= num_phases2)
mp2975_set_phase_rail2(info, num_phases2);
return 0;
}
static int
mp2975_identify_vid(struct i2c_client *client, struct mp2975_data *data,
struct pmbus_driver_info *info, u32 reg, int page,
u32 imvp_bit, u32 vr_bit)
{
int ret;
/* Identify VID mode and step selection. */
ret = i2c_smbus_read_word_data(client, reg);
if (ret < 0)
return ret;
if (ret & imvp_bit) {
info->vrm_version[page] = imvp9;
data->vid_step[page] = MP2975_PROT_DEV_OV_OFF;
} else if (ret & vr_bit) {
info->vrm_version[page] = vr12;
data->vid_step[page] = MP2975_PROT_DEV_OV_ON;
} else {
info->vrm_version[page] = vr13;
data->vid_step[page] = MP2975_PROT_DEV_OV_OFF;
}
return 0;
}
static int
mp2975_identify_rails_vid(struct i2c_client *client, struct mp2975_data *data,
struct pmbus_driver_info *info)
{
int ret;
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 2);
if (ret < 0)
return ret;
/* Identify VID mode for rail 1. */
ret = mp2975_identify_vid(client, data, info,
MP2975_MFR_VR_MULTI_CONFIG_R1, 0,
MP2975_IMVP9_EN_R1, MP2975_VID_STEP_SEL_R1);
if (ret < 0)
return ret;
/* Identify VID mode for rail 2, if connected. */
if (info->phases[1])
ret = mp2975_identify_vid(client, data, info,
MP2975_MFR_VR_MULTI_CONFIG_R2, 1,
MP2975_IMVP9_EN_R2,
MP2975_VID_STEP_SEL_R2);
return ret;
}
static int
mp2975_current_sense_gain_get(struct i2c_client *client,
struct mp2975_data *data)
{
int i, ret;
/*
* Obtain DrMOS current sense gain of power stage from the register
* MP2975_MFR_VR_CONFIG1, bits 13-12. The value is selected as below:
* 00b - 5µA/A, 01b - 8.5µA/A, 10b - 9.7µA/A, 11b - 10µA/A. Other
* values are invalid.
*/
for (i = 0 ; i < data->info.pages; i++) {
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i);
if (ret < 0)
return ret;
ret = i2c_smbus_read_word_data(client,
MP2975_MFR_VR_CONFIG1);
if (ret < 0)
return ret;
switch ((ret & MP2975_DRMOS_KCS) >> 12) {
case 0:
data->curr_sense_gain[i] = 50;
break;
case 1:
data->curr_sense_gain[i] = 85;
break;
case 2:
data->curr_sense_gain[i] = 97;
break;
default:
data->curr_sense_gain[i] = 100;
break;
}
}
return 0;
}
static int
mp2975_vref_get(struct i2c_client *client, struct mp2975_data *data,
struct pmbus_driver_info *info)
{
int ret;
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 3);
if (ret < 0)
return ret;
/* Get voltage reference value for rail 1. */
ret = i2c_smbus_read_word_data(client, MP2975_MFR_READ_VREF_R1);
if (ret < 0)
return ret;
data->vref[0] = ret * data->vid_step[0];
/* Get voltage reference value for rail 2, if connected. */
if (data->info.pages == MP2975_PAGE_NUM) {
ret = i2c_smbus_read_word_data(client, MP2975_MFR_READ_VREF_R2);
if (ret < 0)
return ret;
data->vref[1] = ret * data->vid_step[1];
}
return 0;
}
static int
mp2975_vref_offset_get(struct i2c_client *client, struct mp2975_data *data,
int page)
{
int ret;
ret = i2c_smbus_read_word_data(client, MP2975_MFR_OVP_TH_SET);
if (ret < 0)
return ret;
switch ((ret & GENMASK(5, 3)) >> 3) {
case 1:
data->vref_off[page] = 140;
break;
case 2:
data->vref_off[page] = 220;
break;
case 4:
data->vref_off[page] = 400;
break;
default:
return -EINVAL;
}
return 0;
}
static int
mp2975_vout_max_get(struct i2c_client *client, struct mp2975_data *data,
struct pmbus_driver_info *info, int page)
{
int ret;
/* Get maximum reference voltage of VID-DAC in VID format. */
ret = i2c_smbus_read_word_data(client, PMBUS_VOUT_MAX);
if (ret < 0)
return ret;
data->vout_max[page] = mp2975_vid2direct(info->vrm_version[page], ret &
GENMASK(8, 0));
return 0;
}
static int
mp2975_identify_vout_format(struct i2c_client *client,
struct mp2975_data *data, int page)
{
int ret;
ret = i2c_smbus_read_word_data(client, MP2975_MFR_DC_LOOP_CTRL);
if (ret < 0)
return ret;
if (ret & MP2975_VOUT_FORMAT)
data->vout_format[page] = vid;
else
data->vout_format[page] = direct;
return 0;
}
static int
mp2975_vout_ov_scale_get(struct i2c_client *client, struct mp2975_data *data,
struct pmbus_driver_info *info)
{
int thres_dev, sense_ampl, ret;
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
if (ret < 0)
return ret;
/*
* Get divider for over- and under-voltage protection thresholds
* configuration from the Advanced Options of Auto Phase Shedding and
* decay register.
*/
ret = i2c_smbus_read_word_data(client, MP2975_MFR_APS_DECAY_ADV);
if (ret < 0)
return ret;
thres_dev = ret & MP2975_PRT_THRES_DIV_OV_EN ? MP2975_PROT_DEV_OV_ON :
MP2975_PROT_DEV_OV_OFF;
/* Select the gain of remote sense amplifier. */
ret = i2c_smbus_read_word_data(client, PMBUS_VOUT_SCALE_LOOP);
if (ret < 0)
return ret;
sense_ampl = ret & MP2975_SENSE_AMPL ? MP2975_SENSE_AMPL_HALF :
MP2975_SENSE_AMPL_UNIT;
data->vout_scale = sense_ampl * thres_dev;
return 0;
}
static int
mp2975_vout_per_rail_config_get(struct i2c_client *client,
struct mp2975_data *data,
struct pmbus_driver_info *info)
{
int i, ret;
for (i = 0; i < data->info.pages; i++) {
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i);
if (ret < 0)
return ret;
/* Obtain voltage reference offsets. */
ret = mp2975_vref_offset_get(client, data, i);
if (ret < 0)
return ret;
/* Obtain maximum voltage values. */
ret = mp2975_vout_max_get(client, data, info, i);
if (ret < 0)
return ret;
/*
* Get VOUT format for READ_VOUT command : VID or direct.
* Pages on same device can be configured with different
* formats.
*/
ret = mp2975_identify_vout_format(client, data, i);
if (ret < 0)
return ret;
/*
* Set over-voltage fixed value. Thresholds are provided as
* fixed value, and tracking value. The minimum of them are
* exposed as over-voltage critical threshold.
*/
data->vout_ov_fixed[i] = data->vref[i] +
DIV_ROUND_CLOSEST(data->vref_off[i] *
data->vout_scale,
10);
}
return 0;
}
static struct pmbus_driver_info mp2975_info = {
.pages = 1,
.format[PSC_VOLTAGE_IN] = linear,
.format[PSC_VOLTAGE_OUT] = direct,
.format[PSC_TEMPERATURE] = direct,
.format[PSC_CURRENT_IN] = linear,
.format[PSC_CURRENT_OUT] = direct,
.format[PSC_POWER] = direct,
.m[PSC_TEMPERATURE] = 1,
.m[PSC_VOLTAGE_OUT] = 1,
.R[PSC_VOLTAGE_OUT] = 3,
.m[PSC_CURRENT_OUT] = 1,
.m[PSC_POWER] = 1,
.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_POUT |
PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT | PMBUS_PHASE_VIRTUAL,
.read_byte_data = mp2975_read_byte_data,
.read_word_data = mp2975_read_word_data,
};
static int mp2975_probe(struct i2c_client *client)
{
struct pmbus_driver_info *info;
struct mp2975_data *data;
int ret;
data = devm_kzalloc(&client->dev, sizeof(struct mp2975_data),
GFP_KERNEL);
if (!data)
return -ENOMEM;
memcpy(&data->info, &mp2975_info, sizeof(*info));
info = &data->info;
/* Identify multiphase configuration for rail 2. */
ret = mp2975_identify_multiphase_rail2(client);
if (ret < 0)
return ret;
if (ret) {
/* Two rails are connected. */
data->info.pages = MP2975_PAGE_NUM;
data->info.phases[1] = ret;
data->info.func[1] = MP2975_RAIL2_FUNC;
}
/* Identify multiphase configuration. */
ret = mp2975_identify_multiphase(client, data, info);
if (ret)
return ret;
/* Identify VID setting per rail. */
ret = mp2975_identify_rails_vid(client, data, info);
if (ret < 0)
return ret;
/* Obtain current sense gain of power stage. */
ret = mp2975_current_sense_gain_get(client, data);
if (ret)
return ret;
/* Obtain voltage reference values. */
ret = mp2975_vref_get(client, data, info);
if (ret)
return ret;
/* Obtain vout over-voltage scales. */
ret = mp2975_vout_ov_scale_get(client, data, info);
if (ret < 0)
return ret;
/* Obtain offsets, maximum and format for vout. */
ret = mp2975_vout_per_rail_config_get(client, data, info);
if (ret)
return ret;
return pmbus_do_probe(client, info);
}
static const struct i2c_device_id mp2975_id[] = {
{"mp2975", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, mp2975_id);
static const struct of_device_id __maybe_unused mp2975_of_match[] = {
{.compatible = "mps,mp2975"},
{}
};
MODULE_DEVICE_TABLE(of, mp2975_of_match);
static struct i2c_driver mp2975_driver = {
.driver = {
.name = "mp2975",
.of_match_table = of_match_ptr(mp2975_of_match),
},
.probe_new = mp2975_probe,
.remove = pmbus_do_remove,
.id_table = mp2975_id,
};
module_i2c_driver(mp2975_driver);
MODULE_AUTHOR("Vadim Pasternak <vadimp@nvidia.com>");
MODULE_DESCRIPTION("PMBus driver for MPS MP2975 device");
MODULE_LICENSE("GPL");