450 lines
9.9 KiB
ReStructuredText
450 lines
9.9 KiB
ReStructuredText
Kernel driver ltc2978
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=====================
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Supported chips:
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* Linear Technology LTC2972
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Prefix: 'ltc2972'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltc2972.html
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* Linear Technology LTC2974
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Prefix: 'ltc2974'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltc2974
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* Linear Technology LTC2975
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Prefix: 'ltc2975'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltc2975
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* Linear Technology LTC2977
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Prefix: 'ltc2977'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltc2977
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* Linear Technology LTC2978, LTC2978A
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Prefix: 'ltc2978'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltc2978
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https://www.analog.com/en/products/ltc2978a
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* Linear Technology LTC2979
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Prefix: 'ltc2979'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltc2979
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* Linear Technology LTC2980
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Prefix: 'ltc2980'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltc2980
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* Linear Technology LTC3880
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Prefix: 'ltc3880'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltc3880
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* Linear Technology LTC3882
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Prefix: 'ltc3882'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltc3882
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* Linear Technology LTC3883
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Prefix: 'ltc3883'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltc3883
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* Linear Technology LTC3884
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Prefix: 'ltc3884'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltc3884
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* Linear Technology LTC3886
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Prefix: 'ltc3886'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltc3886
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* Linear Technology LTC3887
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Prefix: 'ltc3887'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltc3887
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* Linear Technology LTC3889
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Prefix: 'ltc3889'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltc3889
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* Linear Technology LTC7880
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Prefix: 'ltc7880'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltc7880
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* Linear Technology LTM2987
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Prefix: 'ltm2987'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltm2987
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* Linear Technology LTM4644
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Prefix: 'ltm4644'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltm4644
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* Linear Technology LTM4675
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Prefix: 'ltm4675'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltm4675
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* Linear Technology LTM4676
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Prefix: 'ltm4676'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltm4676
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* Linear Technology LTM4677
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Prefix: 'ltm4677'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltm4677
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* Linear Technology LTM4678
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Prefix: 'ltm4678'
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Addresses scanned: -
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Datasheet: https://www.analog.com/en/products/ltm4678
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* Analog Devices LTM4680
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Prefix: 'ltm4680'
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Addresses scanned: -
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Datasheet: https://www.analog.com/ltm4680
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* Analog Devices LTM4686
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Prefix: 'ltm4686'
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Addresses scanned: -
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Datasheet: https://www.analog.com/ltm4686
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* Analog Devices LTM4700
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Prefix: 'ltm4700'
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Addresses scanned: -
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Datasheet: https://www.analog.com/ltm4700
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Author: Guenter Roeck <linux@roeck-us.net>
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Description
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-----------
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- LTC2974 and LTC2975 are quad digital power supply managers.
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- LTC2978 is an octal power supply monitor.
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- LTC2977 is a pin compatible replacement for LTC2978.
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- LTC2980 is a 16-channel Power System Manager, consisting of two LTC2977
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- in a single die. The chip is instantiated and reported as two separate chips
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- on two different I2C bus addresses.
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- LTC3880, LTC3882, LTC3886, and LTC3887 are dual output poly-phase step-down
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- DC/DC controllers.
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- LTC3883 is a single phase step-down DC/DC controller.
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- LTM2987 is a 16-channel Power System Manager with two LTC2977 plus
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- additional components on a single die. The chip is instantiated and reported
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- as two separate chips on two different I2C bus addresses.
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- LTM4675 is a dual 9A or single 18A μModule regulator
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- LTM4676 is a dual 13A or single 26A uModule regulator.
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- LTM4686 is a dual 10A or single 20A uModule regulator.
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Usage Notes
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-----------
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This driver does not probe for PMBus devices. You will have to instantiate
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devices explicitly.
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Example: the following commands will load the driver for an LTC2978 at address
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0x60 on I2C bus #1::
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# modprobe ltc2978
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# echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device
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Sysfs attributes
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----------------
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======================= ========================================================
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in1_label "vin"
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in1_input Measured input voltage.
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in1_min Minimum input voltage.
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in1_max Maximum input voltage.
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LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
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LTC2979 and LTM2987 only.
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in1_lcrit Critical minimum input voltage.
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LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
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LTC2979 and LTM2987 only.
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in1_crit Critical maximum input voltage.
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in1_min_alarm Input voltage low alarm.
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in1_max_alarm Input voltage high alarm.
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LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
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LTC2979 and LTM2987 only.
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in1_lcrit_alarm Input voltage critical low alarm.
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LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
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LTC2979 and LTM2987 only.
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in1_crit_alarm Input voltage critical high alarm.
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in1_lowest Lowest input voltage.
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LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
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and LTM2987 only.
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in1_highest Highest input voltage.
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in1_reset_history Reset input voltage history.
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in[N]_label "vout[1-8]".
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- LTC2972: N=2-3
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- LTC2974, LTC2975: N=2-5
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- LTC2977, LTC2979, LTC2980, LTM2987: N=2-9
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- LTC2978: N=2-9
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- LTC3880, LTC3882, LTC3884, LTC23886 LTC3887, LTC3889,
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LTC7880, LTM4644, LTM4675, LTM4676, LTM4677, LTM4678,
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LTM4680, LTM4700: N=2-3
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- LTC3883: N=2
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in[N]_input Measured output voltage.
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in[N]_min Minimum output voltage.
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in[N]_max Maximum output voltage.
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in[N]_lcrit Critical minimum output voltage.
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in[N]_crit Critical maximum output voltage.
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in[N]_min_alarm Output voltage low alarm.
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in[N]_max_alarm Output voltage high alarm.
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in[N]_lcrit_alarm Output voltage critical low alarm.
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in[N]_crit_alarm Output voltage critical high alarm.
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in[N]_lowest Lowest output voltage.
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LTC2972, LTC2974, LTC2975,and LTC2978 only.
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in[N]_highest Highest output voltage.
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in[N]_reset_history Reset output voltage history.
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temp[N]_input Measured temperature.
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- On LTC2972, temp[1-2] report external temperatures,
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and temp 3 reports the chip temperature.
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- On LTC2974 and LTC2975, temp[1-4] report external
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temperatures, and temp5 reports the chip temperature.
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- On LTC2977, LTC2979, LTC2980, LTC2978, and LTM2987,
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only one temperature measurement is supported and
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reports the chip temperature.
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- On LTC3880, LTC3882, LTC3886, LTC3887, LTC3889,
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LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,
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and LTM4700, temp1 and temp2 report external
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temperatures, and temp3 reports the chip temperature.
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- On LTC3883, temp1 reports an external temperature,
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and temp2 reports the chip temperature.
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temp[N]_min Mimimum temperature.
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LTC2972, LTC2974, LCT2977, LTM2980, LTC2978,
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LTC2979, and LTM2987 only.
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temp[N]_max Maximum temperature.
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temp[N]_lcrit Critical low temperature.
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temp[N]_crit Critical high temperature.
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temp[N]_min_alarm Temperature low alarm.
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LTC2972, LTC2974, LTC2975, LTC2977, LTM2980, LTC2978,
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LTC2979, and LTM2987 only.
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temp[N]_max_alarm Temperature high alarm.
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temp[N]_lcrit_alarm Temperature critical low alarm.
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temp[N]_crit_alarm Temperature critical high alarm.
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temp[N]_lowest Lowest measured temperature.
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- LTC2972, LTC2974, LTC2975, LTC2977, LTM2980, LTC2978,
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LTC2979, and LTM2987 only.
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- Not supported for chip temperature sensor on LTC2974
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and LTC2975.
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temp[N]_highest Highest measured temperature.
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Not supported for chip temperature sensor on
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LTC2974 and LTC2975.
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temp[N]_reset_history Reset temperature history.
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Not supported for chip temperature sensor on
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LTC2974 and LTC2975.
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power1_label "pin". LTC3883 and LTC3886 only.
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power1_input Measured input power.
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power[N]_label "pout[1-4]".
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- LTC2972: N=1-2
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- LTC2974, LTC2975: N=1-4
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- LTC2977, LTC2979, LTC2980, LTM2987: Not supported
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- LTC2978: Not supported
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- LTC3880, LTC3882, LTC3884, LTC3886, LTC3887, LTC3889,
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LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,
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LTM4700: N=1-2
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- LTC3883: N=2
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power[N]_input Measured output power.
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curr1_label "iin".
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LTC3880, LTC3883, LTC3884, LTC3886, LTC3887, LTC3889,
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LTM4644, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,
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and LTM4700 only.
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curr1_input Measured input current.
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curr1_max Maximum input current.
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curr1_max_alarm Input current high alarm.
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curr1_highest Highest input current.
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LTC3883 and LTC3886 only.
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curr1_reset_history Reset input current history.
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LTC3883 and LTC3886 only.
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curr[N]_label "iout[1-4]".
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- LTC2972: N-1-2
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- LTC2974, LTC2975: N=1-4
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- LTC2977, LTC2979, LTC2980, LTM2987: not supported
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- LTC2978: not supported
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- LTC3880, LTC3882, LTC3884, LTC3886, LTC3887, LTC3889,
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LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,
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LTM4700: N=2-3
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- LTC3883: N=2
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curr[N]_input Measured output current.
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curr[N]_max Maximum output current.
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curr[N]_crit Critical high output current.
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curr[N]_lcrit Critical low output current.
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LTC2972, LTC2974 and LTC2975 only.
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curr[N]_max_alarm Output current high alarm.
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curr[N]_crit_alarm Output current critical high alarm.
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curr[N]_lcrit_alarm Output current critical low alarm.
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LTC2972, LTC2974 and LTC2975 only.
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curr[N]_lowest Lowest output current.
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LTC2972, LTC2974 and LTC2975 only.
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curr[N]_highest Highest output current.
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curr[N]_reset_history Reset output current history.
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======================= ========================================================
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