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diff --git a/Documentation/hwmon/ltc2978.rst b/Documentation/hwmon/ltc2978.rst new file mode 100644 index 000000000000..01a24fd6d5fe --- /dev/null +++ b/Documentation/hwmon/ltc2978.rst @@ -0,0 +1,355 @@ +Kernel driver ltc2978 +===================== + +Supported chips: + + * Linear Technology LTC2974 + + Prefix: 'ltc2974' + + Addresses scanned: - + + Datasheet: http://www.linear.com/product/ltc2974 + + * Linear Technology LTC2975 + + Prefix: 'ltc2975' + + Addresses scanned: - + + Datasheet: http://www.linear.com/product/ltc2975 + + * Linear Technology LTC2977 + + Prefix: 'ltc2977' + + Addresses scanned: - + + Datasheet: http://www.linear.com/product/ltc2977 + + * Linear Technology LTC2978, LTC2978A + + Prefix: 'ltc2978' + + Addresses scanned: - + + Datasheet: http://www.linear.com/product/ltc2978 + + http://www.linear.com/product/ltc2978a + + * Linear Technology LTC2980 + + Prefix: 'ltc2980' + + Addresses scanned: - + + Datasheet: http://www.linear.com/product/ltc2980 + + * Linear Technology LTC3880 + + Prefix: 'ltc3880' + + Addresses scanned: - + + Datasheet: http://www.linear.com/product/ltc3880 + + * Linear Technology LTC3882 + + Prefix: 'ltc3882' + + Addresses scanned: - + + Datasheet: http://www.linear.com/product/ltc3882 + + * Linear Technology LTC3883 + + Prefix: 'ltc3883' + + Addresses scanned: - + + Datasheet: http://www.linear.com/product/ltc3883 + + * Linear Technology LTC3886 + + Prefix: 'ltc3886' + + Addresses scanned: - + + Datasheet: http://www.linear.com/product/ltc3886 + + * Linear Technology LTC3887 + + Prefix: 'ltc3887' + + Addresses scanned: - + + Datasheet: http://www.linear.com/product/ltc3887 + + * Linear Technology LTM2987 + + Prefix: 'ltm2987' + + Addresses scanned: - + + Datasheet: http://www.linear.com/product/ltm2987 + + * Linear Technology LTM4675 + + Prefix: 'ltm4675' + + Addresses scanned: - + + Datasheet: http://www.linear.com/product/ltm4675 + + * Linear Technology LTM4676 + + Prefix: 'ltm4676' + + Addresses scanned: - + + Datasheet: http://www.linear.com/product/ltm4676 + + * Analog Devices LTM4686 + + Prefix: 'ltm4686' + + Addresses scanned: - + + Datasheet: http://www.analog.com/ltm4686 + + +Author: Guenter Roeck <linux@roeck-us.net> + + +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, and + LTM2987 only. + +in1_lcrit Critical minimum input voltage. + + LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and + LTM2987 only. + +in1_crit Critical maximum input voltage. + +in1_min_alarm Input voltage low alarm. + +in1_max_alarm Input voltage high alarm. + + LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and + LTM2987 only. +in1_lcrit_alarm Input voltage critical low alarm. + + LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and + LTM2987 only. +in1_crit_alarm Input voltage critical high alarm. + +in1_lowest Lowest input voltage. + + 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]". + + - LTC2974, LTC2975: N=2-5 + - LTC2977, LTC2980, LTM2987: N=2-9 + - LTC2978: N=2-9 + - LTC3880, LTC3882, LTC23886 LTC3887, LTM4675, LTM4676: + 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. + + + 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 LTC2974 and LTC2975, temp[1-4] report external + temperatures, and temp5 reports the chip temperature. + - On LTC2977, LTC2980, LTC2978, and LTM2987, only one + temperature measurement is supported and reports + the chip temperature. + - On LTC3880, LTC3882, LTC3887, LTM4675, and LTM4676, + 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 Mimimum temperature. + + LTC2974, LCT2977, LTM2980, LTC2978, 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. + + LTC2974, LTC2975, LTC2977, LTM2980, LTC2978, 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. + + - LTC2974, LTC2975, LTC2977, LTM2980, LTC2978, 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]". + + - LTC2974, LTC2975: N=1-4 + - LTC2977, LTC2980, LTM2987: Not supported + - LTC2978: Not supported + - LTC3880, LTC3882, LTC3886, LTC3887, LTM4675, LTM4676: + N=1-2 + - LTC3883: N=2 + +power[N]_input Measured output power. + +curr1_label "iin". + + LTC3880, LTC3883, LTC3886, LTC3887, LTM4675, + and LTM4676 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]". + + - LTC2974, LTC2975: N=1-4 + - LTC2977, LTC2980, LTM2987: not supported + - LTC2978: not supported + - LTC3880, LTC3882, LTC3886, LTC3887, LTM4675, LTM4676: + 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. + + 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. + + LTC2974 and LTC2975 only. + +curr[N]_lowest Lowest output current. + + LTC2974 and LTC2975 only. + +curr[N]_highest Highest output current. + +curr[N]_reset_history Reset output current history. +======================= ======================================================== |