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The chip's programming interface is quite similar to LTC3880 and supports the same set of sensors. Reviewed-by: Robert Coulson <rob.coulson@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
157 lines
5.3 KiB
Text
157 lines
5.3 KiB
Text
Kernel driver ltc2978
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=====================
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Supported chips:
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* Linear Technology LTC2974
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Prefix: 'ltc2974'
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Addresses scanned: -
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Datasheet: http://www.linear.com/product/ltc2974
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* Linear Technology LTC2977
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Prefix: 'ltc2977'
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Addresses scanned: -
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Datasheet: http://www.linear.com/product/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: http://www.linear.com/product/ltc2978
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http://www.linear.com/product/ltc2978a
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* Linear Technology LTC3880
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Prefix: 'ltc3880'
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Addresses scanned: -
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Datasheet: http://www.linear.com/product/ltc3880
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* Linear Technology LTC3883
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Prefix: 'ltc3883'
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Addresses scanned: -
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Datasheet: http://www.linear.com/product/ltc3883
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* Linear Technology LTM4676
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Prefix: 'ltm4676'
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Addresses scanned: -
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Datasheet: http://www.linear.com/product/ltm4676
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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 is a quad digital power supply manager. LTC2978 is an octal power supply
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monitor. LTC2977 is a pin compatible replacement for LTC2978. LTC3880 is a dual
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output poly-phase step-down DC/DC controller. LTC3883 is a single phase
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step-down DC/DC controller. LTM4676 is a dual 13A or single 26A uModule
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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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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, LTC2977, and LTC2978 only.
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in1_lcrit Critical minimum input voltage.
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LTC2974, LTC2977, and LTC2978 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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LTC2974, LTC2977, and LTC2978 only.
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in1_lcrit_alarm Input voltage critical low alarm.
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LTC2974, LTC2977, and LTC2978 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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LTC2974, LTC2977, and LTC2978 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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LTC2974: N=2-5
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LTC2977: N=2-9
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LTC2978: N=2-9
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LTC3880, LTM4676: 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. LTC2974 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 LTC2974, temp[1-4] report external temperatures,
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and temp5 reports the chip temperature.
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On LTC2977 and LTC2978, only one temperature measurement
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is supported and reports the chip temperature.
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On LTC3880 and LTM4676, 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. LTC2974, LCT2977, and LTC2978 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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LTC2974, LTC2977, and LTC2978 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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LTC2974, LTC2977, and LTC2978 only.
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Not supported for chip temperature sensor on LTC2974.
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temp[N]_highest Highest measured temperature. Not supported for chip
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temperature sensor on LTC2974.
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temp[N]_reset_history Reset temperature history. Not supported for chip
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temperature sensor on LTC2974.
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power1_label "pin". LTC3883 only.
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power1_input Measured input power.
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power[N]_label "pout[1-4]".
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LTC2974: N=1-4
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LTC2977: Not supported
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LTC2978: Not supported
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LTC3880, LTM4676: 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". LTC3880, LTC3883, and LTM4676 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. LTC3883 only.
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curr1_reset_history Reset input current history. LTC3883 only.
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curr[N]_label "iout[1-4]".
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LTC2974: N=1-4
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LTC2977: not supported
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LTC2978: not supported
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LTC3880, LTM4676: 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. LTC2974 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. LTC2974 only.
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curr[N]_lowest Lowest output current. LTC2974 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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