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hwmon: (pmbus/tps53679) Add support for TPS53681 

TPS53681 is a dual-channel multiphase step-down controller
supporting per-phase and per-channel output telemetry.

Cc: Vadim Pasternak <vadimp@mellanox.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2020-01-20 08:11:07 -08:00
parent 39c749aca8
commit 53030bcc87
2 changed files with 119 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/hwmon/pmbus/Kconfig
View File

@ -210,10 +210,10 @@ config SENSORS_TPS40422
be called tps40422.
config SENSORS_TPS53679
tristate "TI TPS53679, TPS53688"
tristate "TI TPS53679, TPS53681, TPS53688"
help
If you say yes here you get hardware monitoring support for TI
TPS53679, TPS53688
TPS53679, TPS53681, and TPS53688.
This driver can also be built as a module. If so, the module will
be called tps53679.

120
drivers/hwmon/pmbus/tps53679.c
View File

@ -6,6 +6,7 @@
* Copyright (c) 2017 Vadim Pasternak <vadimp@mellanox.com>
*/
#include <linux/bits.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
@ -15,7 +16,7 @@
#include "pmbus.h"
enum chips {
tps53679, tps53688,
tps53679, tps53681, tps53688
};
#define TPS53679_PROT_VR12_5MV 0x01 /* VR12.0 mode, 5-mV DAC */
@ -25,8 +26,14 @@ enum chips {
#define TPS53679_PROT_VR13_5MV 0x07 /* VR13.0 mode, 5-mV DAC */
#define TPS53679_PAGE_NUM 2
static int tps53679_identify(struct i2c_client *client,
struct pmbus_driver_info *info)
#define TPS53681_DEVICE_ID 0x81
#define TPS53681_PMBUS_REVISION 0x33
#define TPS53681_MFR_SPECIFIC_20 0xe4 /* Number of phases, per page */
static int tps53679_identify_mode(struct i2c_client *client,
struct pmbus_driver_info *info)
{
u8 vout_params;
int i, ret;
@ -57,6 +64,99 @@ static int tps53679_identify(struct i2c_client *client,
return 0;
}
static int tps53679_identify_phases(struct i2c_client *client,
struct pmbus_driver_info *info)
{
int ret;
/* On TPS53681, only channel A provides per-phase output current */
ret = pmbus_read_byte_data(client, 0, TPS53681_MFR_SPECIFIC_20);
if (ret < 0)
return ret;
info->phases[0] = (ret & 0x07) + 1;
return 0;
}
static int tps53679_identify_chip(struct i2c_client *client,
u8 revision, u16 id)
{
u8 buf[I2C_SMBUS_BLOCK_MAX];
int ret;
ret = pmbus_read_byte_data(client, 0, PMBUS_REVISION);
if (ret < 0)
return ret;
if (ret != revision) {
dev_err(&client->dev, "Unexpected PMBus revision 0x%x\n", ret);
return -ENODEV;
}
ret = i2c_smbus_read_block_data(client, PMBUS_IC_DEVICE_ID, buf);
if (ret < 0)
return ret;
if (ret != 1 || buf[0] != id) {
dev_err(&client->dev, "Unexpected device ID 0x%x\n", buf[0]);
return -ENODEV;
}
return 0;
}
/*
* Common identification function for chips with multi-phase support.
* Since those chips have special configuration registers, we want to have
* some level of reassurance that we are really talking with the chip
* being probed. Check PMBus revision and chip ID.
*/
static int tps53679_identify_multiphase(struct i2c_client *client,
struct pmbus_driver_info *info,
int pmbus_rev, int device_id)
{
int ret;
ret = tps53679_identify_chip(client, pmbus_rev, device_id);
if (ret < 0)
return ret;
ret = tps53679_identify_mode(client, info);
if (ret < 0)
return ret;
return tps53679_identify_phases(client, info);
}
static int tps53679_identify(struct i2c_client *client,
struct pmbus_driver_info *info)
{
return tps53679_identify_mode(client, info);
}
static int tps53681_identify(struct i2c_client *client,
struct pmbus_driver_info *info)
{
return tps53679_identify_multiphase(client, info,
TPS53681_PMBUS_REVISION,
TPS53681_DEVICE_ID);
}
static int tps53681_read_word_data(struct i2c_client *client, int page,
int phase, int reg)
{
/*
* For reading the total output current (READ_IOUT) for all phases,
* the chip datasheet is a bit vague. It says "PHASE must be set to
* FFh to access all phases simultaneously. PHASE may also be set to
* 80h readack (!) the total phase current".
* Experiments show that the command does _not_ report the total
* current for all phases if the phase is set to 0xff. Instead, it
* appears to report the current of one of the phases. Override phase
* parameter with 0x80 when reading the total output current on page 0.
*/
if (reg == PMBUS_READ_IOUT && page == 0 && phase == 0xff)
return pmbus_read_word_data(client, page, 0x80, reg);
return -ENODATA;
}
static struct pmbus_driver_info tps53679_info = {
.format[PSC_VOLTAGE_IN] = linear,
.format[PSC_VOLTAGE_OUT] = vid,
@ -73,6 +173,12 @@ static struct pmbus_driver_info tps53679_info = {
PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
PMBUS_HAVE_POUT,
.pfunc[0] = PMBUS_HAVE_IOUT,
.pfunc[1] = PMBUS_HAVE_IOUT,
.pfunc[2] = PMBUS_HAVE_IOUT,
.pfunc[3] = PMBUS_HAVE_IOUT,
.pfunc[4] = PMBUS_HAVE_IOUT,
.pfunc[5] = PMBUS_HAVE_IOUT,
};
static int tps53679_probe(struct i2c_client *client,
@ -97,6 +203,12 @@ static int tps53679_probe(struct i2c_client *client,
info->pages = TPS53679_PAGE_NUM;
info->identify = tps53679_identify;
break;
case tps53681:
info->pages = TPS53679_PAGE_NUM;
info->phases[0] = 6;
info->identify = tps53681_identify;
info->read_word_data = tps53681_read_word_data;
break;
default:
return -ENODEV;
}
@ -106,6 +218,7 @@ static int tps53679_probe(struct i2c_client *client,
static const struct i2c_device_id tps53679_id[] = {
{"tps53679", tps53679},
{"tps53681", tps53681},
{"tps53688", tps53688},
{}
};
@ -114,6 +227,7 @@ MODULE_DEVICE_TABLE(i2c, tps53679_id);
static const struct of_device_id __maybe_unused tps53679_of_match[] = {
{.compatible = "ti,tps53679", .data = (void *)tps53679},
{.compatible = "ti,tps53681", .data = (void *)tps53681},
{.compatible = "ti,tps53688", .data = (void *)tps53688},
{}
};