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hwmon: (pmbus/max16601) Determine and use number of populated phases

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The MAX16601 can report the number of populated phases. Use this
information to only create sysfs attributes for populated phases.

Cc: Alex Qiu <xqiu@google.com>
Cc: Ugur Usug <Ugur.Usug@maximintegrated.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20210125185327.93282-1-linux@roeck-us.net
Reviewed-by: Alex Qiu <xqiu@google.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2021-01-25 10:53:26 -08:00
parent 906ace80c2
commit 220c404dc7
2 changed files with 75 additions and 99 deletions
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157
Documentation/hwmon/max16601.rst
View File

@ -45,115 +45,76 @@ Sysfs entries
The following attributes are supported.
======================= =======================================================
in1_label "vin1"
in1_input VCORE input voltage.
in1_alarm Input voltage alarm.
=============================== ===============================================
in1_label "vin1"
in1_input VCORE input voltage.
in1_alarm Input voltage alarm.
in2_label "vout1"
in2_input VCORE output voltage.
in2_alarm Output voltage alarm.
in2_label "vout1"
in2_input VCORE output voltage.
in2_alarm Output voltage alarm.
curr1_label "iin1"
curr1_input VCORE input current, derived from duty cycle and output
current.
curr1_max Maximum input current.
curr1_max_alarm Current high alarm.
curr1_label "iin1"
curr1_input VCORE input current, derived from duty cycle
and output current.
curr1_max Maximum input current.
curr1_max_alarm Current high alarm.
curr2_label "iin1.0"
curr2_input VCORE phase 0 input current.
curr[P+2]_label "iin1.P"
curr[P+2]_input VCORE phase P input current.
curr3_label "iin1.1"
curr3_input VCORE phase 1 input current.
curr[N+2]_label "iin2"
curr[N+2]_input VCORE input current, derived from sensor
element.
'N' is the number of enabled/populated phases.
curr4_label "iin1.2"
curr4_input VCORE phase 2 input current.
curr[N+3]_label "iin3"
curr[N+3]_input VSA input current.
curr5_label "iin1.3"
curr5_input VCORE phase 3 input current.
curr[N+4]_label "iout1"
curr[N+4]_input VCORE output current.
curr[N+4]_crit Critical output current.
curr[N+4]_crit_alarm Output current critical alarm.
curr[N+4]_max Maximum output current.
curr[N+4]_max_alarm Output current high alarm.
curr6_label "iin1.4"
curr6_input VCORE phase 4 input current.
curr[N+P+5]_label "iout1.P"
curr[N+P+5]_input VCORE phase P output current.
curr7_label "iin1.5"
curr7_input VCORE phase 5 input current.
curr[2*N+5]_label "iout3"
curr[2*N+5]_input VSA output current.
curr[2*N+5]_highest Historical maximum VSA output current.
curr[2*N+5]_reset_history Write any value to reset curr21_highest.
curr[2*N+5]_crit Critical output current.
curr[2*N+5]_crit_alarm Output current critical alarm.
curr[2*N+5]_max Maximum output current.
curr[2*N+5]_max_alarm Output current high alarm.
curr8_label "iin1.6"
curr8_input VCORE phase 6 input current.
power1_label "pin1"
power1_input Input power, derived from duty cycle and output
current.
power1_alarm Input power alarm.
curr9_label "iin1.7"
curr9_input VCORE phase 7 input current.
power2_label "pin2"
power2_input Input power, derived from input current sensor.
curr10_label "iin2"
curr10_input VCORE input current, derived from sensor element.
power3_label "pout"
power3_input Output power.
curr11_label "iin3"
curr11_input VSA input current.
temp1_input VCORE temperature.
temp1_crit Critical high temperature.
temp1_crit_alarm Chip temperature critical high alarm.
temp1_max Maximum temperature.
temp1_max_alarm Chip temperature high alarm.
curr12_label "iout1"
curr12_input VCORE output current.
curr12_crit Critical output current.
curr12_crit_alarm Output current critical alarm.
curr12_max Maximum output current.
curr12_max_alarm Output current high alarm.
temp2_input TSENSE_0 temperature
temp3_input TSENSE_1 temperature
temp4_input TSENSE_2 temperature
temp5_input TSENSE_3 temperature
curr13_label "iout1.0"
curr13_input VCORE phase 0 output current.
curr14_label "iout1.1"
curr14_input VCORE phase 1 output current.
curr15_label "iout1.2"
curr15_input VCORE phase 2 output current.
curr16_label "iout1.3"
curr16_input VCORE phase 3 output current.
curr17_label "iout1.4"
curr17_input VCORE phase 4 output current.
curr18_label "iout1.5"
curr18_input VCORE phase 5 output current.
curr19_label "iout1.6"
curr19_input VCORE phase 6 output current.
curr20_label "iout1.7"
curr20_input VCORE phase 7 output current.
curr21_label "iout3"
curr21_input VSA output current.
curr21_highest Historical maximum VSA output current.
curr21_reset_history Write any value to reset curr21_highest.
curr21_crit Critical output current.
curr21_crit_alarm Output current critical alarm.
curr21_max Maximum output current.
curr21_max_alarm Output current high alarm.
power1_label "pin1"
power1_input Input power, derived from duty cycle and output current.
power1_alarm Input power alarm.
power2_label "pin2"
power2_input Input power, derived from input current sensor.
power3_label "pout"
power3_input Output power.
temp1_input VCORE temperature.
temp1_crit Critical high temperature.
temp1_crit_alarm Chip temperature critical high alarm.
temp1_max Maximum temperature.
temp1_max_alarm Chip temperature high alarm.
temp2_input TSENSE_0 temperature
temp3_input TSENSE_1 temperature
temp4_input TSENSE_2 temperature
temp5_input TSENSE_3 temperature
temp6_input VSA temperature.
temp6_crit Critical high temperature.
temp6_crit_alarm Chip temperature critical high alarm.
temp6_max Maximum temperature.
temp6_max_alarm Chip temperature high alarm.
======================= =======================================================
temp6_input VSA temperature.
temp6_crit Critical high temperature.
temp6_crit_alarm Chip temperature critical high alarm.
temp6_max Maximum temperature.
temp6_max_alarm Chip temperature high alarm.
=============================== ===============================================

17
drivers/hwmon/pmbus/max16601.c
View File

@ -31,6 +31,7 @@
#include "pmbus.h"
#define REG_DEFAULT_NUM_POP 0xc4
#define REG_SETPT_DVID 0xd1
#define DAC_10MV_MODE BIT(4)
#define REG_IOUT_AVG_PK 0xee
@ -40,6 +41,8 @@
#define CORE_RAIL_INDICATOR BIT(7)
#define REG_PHASE_REPORTING 0xf4
#define MAX16601_NUM_PHASES 8
struct max16601_data {
struct pmbus_driver_info info;
struct i2c_client *vsa;
@ -195,6 +198,18 @@ static int max16601_identify(struct i2c_client *client,
else
info->vrm_version[0] = vr12;
reg = i2c_smbus_read_byte_data(client, REG_DEFAULT_NUM_POP);
if (reg < 0)
return reg;
/*
* If REG_DEFAULT_NUM_POP returns 0, we don't know how many phases
* are populated. Stick with the default in that case.
*/
reg &= 0x0f;
if (reg && reg <= MAX16601_NUM_PHASES)
info->phases[0] = reg;
return 0;
}
@ -216,7 +231,7 @@ static struct pmbus_driver_info max16601_info = {
.func[2] = PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT |
PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | PMBUS_PAGE_VIRTUAL,
.phases[0] = 8,
.phases[0] = MAX16601_NUM_PHASES,
.pfunc[0] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP,
.pfunc[1] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT,
.pfunc[2] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP,