mellanox 2700 platform sensor does not have PSU information.

[lguohan]

PSU information is gone in new version.

Below is the output from

ii hw-management 1.mlnx.15.11.15 amd64 Hardware Management kernel drivers

dps460-i2c-10-59
Adapter: i2c-1-mux (chan_id 0)
vin:         +209.25 V  (crit min =  +0.00 V, min =  +0.00 V)
                       (max =  +0.00 V, crit max =  +0.00 V)
vcap:         +0.00 V  
vout1:       +12.01 V  (crit min = +10.50 V, min =  +0.00 V)
                       (max =  +0.00 V, crit max =  +0.00 V)
fan1:        1830 RPM
temp1:        +41.0 C  (low  =  +0.0 C, high = +100.0 C)
                       (crit low =  +0.0 C, crit =  +0.0 C)
temp2:        +43.5 C  (low  =  +0.0 C, high = +100.0 C)
                       (crit low =  +0.0 C, crit =  +0.0 C)
temp3:         +0.0 C  (low  =  +0.0 C, high = +100.0 C)
                       (crit low =  +0.0 C, crit =  +0.0 C)
pin:          46.25 W  (max = 675.00 W)
pout1:        34.50 W  (max = 564.00 W, crit =   0.00 W)
                       (cap =   0.00 W)
iin:          +0.23 A  (max =  +3.75 A, crit max =  +4.00 A)
iout1:        +2.88 A  (crit min =  +0.00 A, max = +47.00 A)
                       (crit max = +50.00 A)

dps460-i2c-10-58
Adapter: i2c-1-mux (chan_id 0)
vin:         +209.25 V  (crit min =  +0.00 V, min =  +0.00 V)
                       (max =  +0.00 V, crit max =  +0.00 V)
vcap:         +0.00 V  
vout1:       +12.00 V  (crit min = +10.50 V, min =  +0.00 V)
                       (max =  +0.00 V, crit max =  +0.00 V)
fan1:        1800 RPM
temp1:        +42.0 C  (low  =  +0.0 C, high = +100.0 C)
                       (crit low =  +0.0 C, crit =  +0.0 C)
temp2:        +45.0 C  (low  =  +0.0 C, high = +100.0 C)
                       (crit low =  +0.0 C, crit =  +0.0 C)
temp3:         +0.0 C  (low  =  +0.0 C, high = +100.0 C)
                       (crit low =  +0.0 C, crit =  +0.0 C)
pin:          52.00 W  (max = 675.00 W)
pout1:        40.44 W  (max = 564.00 W, crit =   0.00 W)
                       (cap =   0.00 W)
iin:          +0.26 A  (max =  +3.75 A, crit max =  +4.00 A)
iout1:        +3.38 A  (crit min =  +0.00 A, max = +47.00 A)
                       (crit max = +50.00 A)

admin@str-msn2700-05:/bsp/power$ ls /sys/bus/i2c/devices/10-0059/hwmon
ls: cannot access /sys/bus/i2c/devices/10-0059/hwmon: No such file or directory

[lguohan]

it looks like there is a bug in msn2700 start script. we need add this psu_control_driver=dps460, currently it is not there.

        if is_module mlnx_cpld_drv; then
                log_warning_msg "mlnx_cpld_drv module has already been loaded"
        else
                if modprobe mlnx_cpld_drv psu_control_driver=dps460 2>/dev/null; then
                        log_success_msg "mlnx_cpld_drv module load passed"
                else
                        log_failure_msg "mlnx_cpld_drv module load failed"
                fi
        fi

[liatgrozovik]

fixed by sonic-net/sonic-buildimage#541