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ddfb41ca2a
The LTC3880 PMBus command set is comparable to LTC2978. Add support for it to the LTC2978 driver. Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com> Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
104 lines
3.4 KiB
Plaintext
104 lines
3.4 KiB
Plaintext
Kernel driver ltc2978
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=====================
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Supported chips:
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* Linear Technology LTC2978
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Prefix: 'ltc2978'
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Addresses scanned: -
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Datasheet: http://cds.linear.com/docs/Datasheet/2978fa.pdf
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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://cds.linear.com/docs/Datasheet/3880f.pdf
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Author: Guenter Roeck <guenter.roeck@ericsson.com>
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Description
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-----------
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The LTC2978 is an octal power supply monitor, supervisor, sequencer and
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margin controller. The LTC3880 is a dual, PolyPhase DC/DC synchronous
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step-down switching regulator controller.
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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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in1_lcrit Critical minimum input voltage.
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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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in1_lcrit_alarm Input voltage critical low alarm.
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in1_crit_alarm Input voltage critical high alarm.
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in1_lowest Lowest input voltage. LTC2978 only.
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in1_highest Highest input voltage.
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in1_reset_history Reset history. Writing into this attribute will reset
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history for all attributes.
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in[2-9]_label "vout[1-8]". Channels 3 to 9 on LTC2978 only.
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in[2-9]_input Measured output voltage.
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in[2-9]_min Minimum output voltage.
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in[2-9]_max Maximum output voltage.
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in[2-9]_lcrit Critical minimum output voltage.
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in[2-9]_crit Critical maximum output voltage.
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in[2-9]_min_alarm Output voltage low alarm.
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in[2-9]_max_alarm Output voltage high alarm.
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in[2-9]_lcrit_alarm Output voltage critical low alarm.
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in[2-9]_crit_alarm Output voltage critical high alarm.
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in[2-9]_lowest Lowest output voltage. LTC2978 only.
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in[2-9]_highest Lowest output voltage.
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in[2-9]_reset_history Reset history. Writing into this attribute will reset
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history for all attributes.
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temp[1-3]_input Measured temperature.
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On LTC2978, only one temperature measurement is
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supported and reflects the internal temperature.
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On LTC3880, temp1 and temp2 report external
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temperatures, and temp3 reports the internal
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temperature.
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temp[1-3]_min Mimimum temperature.
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temp[1-3]_max Maximum temperature.
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temp[1-3]_lcrit Critical low temperature.
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temp[1-3]_crit Critical high temperature.
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temp[1-3]_min_alarm Chip temperature low alarm.
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temp[1-3]_max_alarm Chip temperature high alarm.
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temp[1-3]_lcrit_alarm Chip temperature critical low alarm.
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temp[1-3]_crit_alarm Chip temperature critical high alarm.
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temp[1-3]_lowest Lowest measured temperature. LTC2978 only.
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temp[1-3]_highest Highest measured temperature.
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temp[1-3]_reset_history Reset history. Writing into this attribute will reset
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history for all attributes.
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power[1-2]_label "pout[1-2]". LTC3880 only.
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power[1-2]_input Measured power.
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curr1_label "iin". LTC3880 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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curr[2-3]_label "iout[1-2]". LTC3880 only.
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curr[2-3]_input Measured input current.
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curr[2-3]_max Maximum input current.
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curr[2-3]_crit Critical input current.
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curr[2-3]_max_alarm Input current high alarm.
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curr[2-3]_crit_alarm Input current critical high alarm.
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