mirror of
https://github.com/torvalds/linux.git
synced 2024-12-22 19:01:37 +00:00
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
|
|
=====================
|
|
|
|
Supported chips:
|
|
* Linear Technology LTC2978
|
|
Prefix: 'ltc2978'
|
|
Addresses scanned: -
|
|
Datasheet: http://cds.linear.com/docs/Datasheet/2978fa.pdf
|
|
* Linear Technology LTC3880
|
|
Prefix: 'ltc3880'
|
|
Addresses scanned: -
|
|
Datasheet: http://cds.linear.com/docs/Datasheet/3880f.pdf
|
|
|
|
Author: Guenter Roeck <guenter.roeck@ericsson.com>
|
|
|
|
|
|
Description
|
|
-----------
|
|
|
|
The LTC2978 is an octal power supply monitor, supervisor, sequencer and
|
|
margin controller. The LTC3880 is a dual, PolyPhase DC/DC synchronous
|
|
step-down switching regulator controller.
|
|
|
|
|
|
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.
|
|
in1_lcrit Critical minimum input voltage.
|
|
in1_crit Critical maximum input voltage.
|
|
in1_min_alarm Input voltage low alarm.
|
|
in1_max_alarm Input voltage high alarm.
|
|
in1_lcrit_alarm Input voltage critical low alarm.
|
|
in1_crit_alarm Input voltage critical high alarm.
|
|
in1_lowest Lowest input voltage. LTC2978 only.
|
|
in1_highest Highest input voltage.
|
|
in1_reset_history Reset history. Writing into this attribute will reset
|
|
history for all attributes.
|
|
|
|
in[2-9]_label "vout[1-8]". Channels 3 to 9 on LTC2978 only.
|
|
in[2-9]_input Measured output voltage.
|
|
in[2-9]_min Minimum output voltage.
|
|
in[2-9]_max Maximum output voltage.
|
|
in[2-9]_lcrit Critical minimum output voltage.
|
|
in[2-9]_crit Critical maximum output voltage.
|
|
in[2-9]_min_alarm Output voltage low alarm.
|
|
in[2-9]_max_alarm Output voltage high alarm.
|
|
in[2-9]_lcrit_alarm Output voltage critical low alarm.
|
|
in[2-9]_crit_alarm Output voltage critical high alarm.
|
|
in[2-9]_lowest Lowest output voltage. LTC2978 only.
|
|
in[2-9]_highest Lowest output voltage.
|
|
in[2-9]_reset_history Reset history. Writing into this attribute will reset
|
|
history for all attributes.
|
|
|
|
temp[1-3]_input Measured temperature.
|
|
On LTC2978, only one temperature measurement is
|
|
supported and reflects the internal temperature.
|
|
On LTC3880, temp1 and temp2 report external
|
|
temperatures, and temp3 reports the internal
|
|
temperature.
|
|
temp[1-3]_min Mimimum temperature.
|
|
temp[1-3]_max Maximum temperature.
|
|
temp[1-3]_lcrit Critical low temperature.
|
|
temp[1-3]_crit Critical high temperature.
|
|
temp[1-3]_min_alarm Chip temperature low alarm.
|
|
temp[1-3]_max_alarm Chip temperature high alarm.
|
|
temp[1-3]_lcrit_alarm Chip temperature critical low alarm.
|
|
temp[1-3]_crit_alarm Chip temperature critical high alarm.
|
|
temp[1-3]_lowest Lowest measured temperature. LTC2978 only.
|
|
temp[1-3]_highest Highest measured temperature.
|
|
temp[1-3]_reset_history Reset history. Writing into this attribute will reset
|
|
history for all attributes.
|
|
|
|
power[1-2]_label "pout[1-2]". LTC3880 only.
|
|
power[1-2]_input Measured power.
|
|
|
|
curr1_label "iin". LTC3880 only.
|
|
curr1_input Measured input current.
|
|
curr1_max Maximum input current.
|
|
curr1_max_alarm Input current high alarm.
|
|
|
|
curr[2-3]_label "iout[1-2]". LTC3880 only.
|
|
curr[2-3]_input Measured input current.
|
|
curr[2-3]_max Maximum input current.
|
|
curr[2-3]_crit Critical input current.
|
|
curr[2-3]_max_alarm Input current high alarm.
|
|
curr[2-3]_crit_alarm Input current critical high alarm.
|