| 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. |
