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Kernel driver ltc2978

Documentation/hwmon/ltc2978.rst

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Kernel driver ltc2978

Supported chips:

Prefix: 'ltm4675'

Addresses scanned: -

Datasheet: https://www.analog.com/en/products/ltm4675

Author: Guenter Roeck [email protected]

Description

  • LTC2974 and LTC2975 are quad digital power supply managers.
  • LTC2978 is an octal power supply monitor.
  • LTC2977 is a pin compatible replacement for LTC2978.
  • LTC2980 is a 16-channel Power System Manager, consisting of two LTC2977
  • in a single die. The chip is instantiated and reported as two separate chips
  • on two different I2C bus addresses.
  • LTC3880, LTC3882, LTC3886, and LTC3887 are dual output poly-phase step-down
  • DC/DC controllers.
  • LTC3883 is a single phase step-down DC/DC controller.
  • LTM2987 is a 16-channel Power System Manager with two LTC2977 plus
  • additional components on a single die. The chip is instantiated and reported
  • as two separate chips on two different I2C bus addresses.
  • LTM4675 is a dual 9A or single 18A μModule regulator
  • LTM4676 is a dual 13A or single 26A uModule regulator.
  • LTM4686 is a dual 10A or single 20A uModule regulator.

Usage Notes

This driver does not probe for PMBus devices. You will have to instantiate devices explicitly.

Example: the following commands will load the driver for an LTC2978 at address 0x60 on I2C bus #1::

# modprobe ltc2978
# echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device

Sysfs attributes

======================= ======================================================== in1_label "vin"

in1_input Measured input voltage.

in1_min Minimum input voltage.

in1_max Maximum input voltage.

		LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
		LTC2979 and LTM2987 only.

in1_lcrit Critical minimum input voltage.

		LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
		LTC2979 and LTM2987 only.

in1_crit Critical maximum input voltage.

in1_min_alarm Input voltage low alarm.

in1_max_alarm Input voltage high alarm.

		LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
		LTC2979 and LTM2987 only.

in1_lcrit_alarm Input voltage critical low alarm.

		LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
		LTC2979 and LTM2987 only.

in1_crit_alarm Input voltage critical high alarm.

in1_lowest Lowest input voltage.

		LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
		and LTM2987 only.

in1_highest Highest input voltage.

in1_reset_history Reset input voltage history.

in[N]_label "vout[1-8]".

		- LTC2972: N=2-3
		- LTC2974, LTC2975: N=2-5
		- LTC2977, LTC2979, LTC2980, LTM2987: N=2-9
		- LTC2978: N=2-9
		- LTC3880, LTC3882, LTC3884, LTC23886 LTC3887, LTC3889,
		  LTC7880, LTM4644, LTM4675, LTM4676, LTM4677, LTM4678,
		  LTM4680, LTM4700: N=2-3
		- LTC3883: N=2

in[N]_input Measured output voltage.

in[N]_min Minimum output voltage.

in[N]_max Maximum output voltage.

in[N]_lcrit Critical minimum output voltage.

in[N]_crit Critical maximum output voltage.

in[N]_min_alarm Output voltage low alarm.

in[N]_max_alarm Output voltage high alarm.

in[N]_lcrit_alarm Output voltage critical low alarm.

in[N]_crit_alarm Output voltage critical high alarm.

in[N]_lowest Lowest output voltage.

		LTC2972, LTC2974, LTC2975,and LTC2978 only.

in[N]_highest Highest output voltage.

in[N]_reset_history Reset output voltage history.

temp[N]_input Measured temperature.

		- On LTC2972, temp[1-2] report external temperatures,
		  and temp 3 reports the chip temperature.
		- On LTC2974 and LTC2975, temp[1-4] report external
		  temperatures, and temp5 reports the chip temperature.
		- On LTC2977, LTC2979, LTC2980, LTC2978, and LTM2987,
		  only one temperature measurement is supported and
		  reports the chip temperature.
		- On LTC3880, LTC3882, LTC3886, LTC3887, LTC3889,
		  LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,
		  and LTM4700, temp1 and temp2 report external
		  temperatures, and temp3 reports the chip temperature.
		- On LTC3883, temp1 reports an external temperature,
		  and temp2 reports the chip temperature.

temp[N]_min Minimum temperature.

		LTC2972, LTC2974, LCT2977, LTM2980, LTC2978,
		LTC2979, and LTM2987 only.

temp[N]_max Maximum temperature.

temp[N]_lcrit Critical low temperature.

temp[N]_crit Critical high temperature.

temp[N]_min_alarm Temperature low alarm.

		LTC2972, LTC2974, LTC2975, LTC2977, LTM2980, LTC2978,
		LTC2979, and LTM2987 only.

temp[N]_max_alarm Temperature high alarm.

temp[N]_lcrit_alarm Temperature critical low alarm.

temp[N]_crit_alarm Temperature critical high alarm.

temp[N]_lowest Lowest measured temperature.

		- LTC2972, LTC2974, LTC2975, LTC2977, LTM2980, LTC2978,
		  LTC2979, and LTM2987 only.
		- Not supported for chip temperature sensor on LTC2974
		  and LTC2975.

temp[N]_highest Highest measured temperature.

		Not supported for chip temperature sensor on
		LTC2974 and LTC2975.

temp[N]_reset_history Reset temperature history.

		Not supported for chip temperature sensor on
		LTC2974 and LTC2975.

power1_label "pin". LTC3883 and LTC3886 only.

power1_input Measured input power.

power[N]_label "pout[1-4]".

		- LTC2972: N=1-2
		- LTC2974, LTC2975: N=1-4
		- LTC2977, LTC2979, LTC2980, LTM2987: Not supported
		- LTC2978: Not supported
		- LTC3880, LTC3882, LTC3884, LTC3886, LTC3887, LTC3889,
		  LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,
		  LTM4700: N=1-2
		- LTC3883: N=2

power[N]_input Measured output power.

curr1_label "iin".

		LTC3880, LTC3883, LTC3884, LTC3886, LTC3887, LTC3889,
		LTM4644, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,
		and LTM4700 only.

curr1_input Measured input current.

curr1_max Maximum input current.

curr1_max_alarm Input current high alarm.

curr1_highest Highest input current.

		LTC3883 and LTC3886 only.

curr1_reset_history Reset input current history.

		LTC3883 and LTC3886 only.

curr[N]_label "iout[1-4]".

		- LTC2972: N-1-2
		- LTC2974, LTC2975: N=1-4
		- LTC2977, LTC2979, LTC2980, LTM2987: not supported
		- LTC2978: not supported
		- LTC3880, LTC3882, LTC3884, LTC3886, LTC3887, LTC3889,
		  LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,
		  LTM4700: N=2-3
		- LTC3883: N=2

curr[N]_input Measured output current.

curr[N]_max Maximum output current.

curr[N]_crit Critical high output current.

curr[N]_lcrit Critical low output current.

		LTC2972, LTC2974 and LTC2975 only.

curr[N]_max_alarm Output current high alarm.

curr[N]_crit_alarm Output current critical high alarm.

curr[N]_lcrit_alarm Output current critical low alarm.

		LTC2972, LTC2974 and LTC2975 only.

curr[N]_lowest Lowest output current.

		LTC2972, LTC2974 and LTC2975 only.

curr[N]_highest Highest output current.

curr[N]_reset_history Reset output current history. ======================= ========================================================