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SPDX-License-Identifier: GPL-2.0 Kernel driver ltc2978 ===================== Supported chips: * Linear Technology LTC2972 Prefix: 'ltc2972' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltc2972.html * Linear Technology LTC2974 Prefix: 'ltc2974' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltc2974 * Linear Technology LTC2975 Prefix: 'ltc2975' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltc2975 * Linear Technology LTC2977 Prefix: 'ltc2977' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltc2977 * Linear Technology LTC2978, LTC2978A Prefix: 'ltc2978' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltc2978 https://www.analog.com/en/products/ltc2978a * Linear Technology LTC2979 Prefix: 'ltc2979' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltc2979 * Linear Technology LTC2980 Prefix: 'ltc2980' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltc2980 * Linear Technology LTC3880 Prefix: 'ltc3880' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltc3880 * Linear Technology LTC3882 Prefix: 'ltc3882' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltc3882 * Linear Technology LTC3883 Prefix: 'ltc3883' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltc3883 * Linear Technology LTC3884 Prefix: 'ltc3884' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltc3884 * Linear Technology LTC3886 Prefix: 'ltc3886' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltc3886 * Linear Technology LTC3887 Prefix: 'ltc3887' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltc3887 * Linear Technology LTC3889 Prefix: 'ltc3889' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltc3889 * Linear Technology LTC7841 Prefix: 'ltc7841' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltc7841 * Linear Technology LTC7880 Prefix: 'ltc7880' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltc7880 * Linear Technology LTM2987 Prefix: 'ltm2987' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltm2987 * Linear Technology LTM4644 Prefix: 'ltm4644' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltm4644 * Linear Technology LTM4675 Prefix: 'ltm4675' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltm4675 * Linear Technology LTM4676 Prefix: 'ltm4676' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltm4676 * Linear Technology LTM4677 Prefix: 'ltm4677' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltm4677 * Linear Technology LTM4678 Prefix: 'ltm4678' Addresses scanned: - Datasheet: https://www.analog.com/en/products/ltm4678 * Analog Devices LTM4680 Prefix: 'ltm4680' Addresses scanned: - Datasheet: https://www.analog.com/ltm4680 * Analog Devices LTM4686 Prefix: 'ltm4686' Addresses scanned: - Datasheet: https://www.analog.com/ltm4686 * Analog Devices LTM4700 Prefix: 'ltm4700' Addresses scanned: - Datasheet: https://www.analog.com/ltm4700 Author: Guenter Roeck 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, LTC2979 and LTM2987 only. in1_lcrit Critical minimum input voltage. LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, LTC2979 and LTM2987 only. in1_crit Critical maximum input voltage. in1_min_alarm Input voltage low alarm. in1_max_alarm Input voltage high alarm. LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, LTC2979 and LTM2987 only. in1_lcrit_alarm Input voltage critical low alarm. LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, LTC2979 and LTM2987 only. in1_crit_alarm Input voltage critical high alarm. in1_lowest Lowest input voltage. LTC2972, 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]". - LTC2972: N=2-3 - LTC2974, LTC2975: N=2-5 - LTC2977, LTC2979, LTC2980, LTM2987: N=2-9 - LTC2978: N=2-9 - LTC3880, LTC3882, LTC3884, LTC23886 LTC3887, LTC3889, LTC7880, LTM4644, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680, LTM4700: N=2-3 - LTC3883: N=2 - LTC7841: 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. LTC2972, 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 LTC2972, temp[1-2] report external temperatures, and temp 3 reports the chip temperature. - On LTC2974 and LTC2975, temp[1-4] report external temperatures, and temp5 reports the chip temperature. - On LTC2977, LTC2979, LTC2980, LTC2978, and LTM2987, only one temperature measurement is supported and reports the chip temperature. - On LTC3880, LTC3882, LTC3886, LTC3887, LTC3889, LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680, and LTM4700, 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 Minimum temperature. LTC2972, LTC2974, LCT2977, LTM2980, LTC2978, LTC2979, 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. LTC2972, LTC2974, LTC2975, LTC2977, LTM2980, LTC2978, LTC2979, 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. - LTC2972, LTC2974, LTC2975, LTC2977, LTM2980, LTC2978, LTC2979, 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]". - LTC2972: N=1-2 - LTC2974, LTC2975: N=1-4 - LTC2977, LTC2979, LTC2980, LTM2987: Not supported - LTC2978: Not supported - LTC3880, LTC3882, LTC3884, LTC3886, LTC3887, LTC3889, LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680, LTM4700: N=1-2 - LTC3883: N=2 power[N]_input Measured output power. curr1_label "iin". LTC3880, LTC3883, LTC3884, LTC3886, LTC3887, LTC3889, LTM4644, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680, and LTM4700 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]". - LTC2972: N-1-2 - LTC2974, LTC2975: N=1-4 - LTC2977, LTC2979, LTC2980, LTM2987: not supported - LTC2978: not supported - LTC3880, LTC3882, LTC3884, LTC3886, LTC3887, LTC3889, LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680, LTM4700: N=2-3 - LTC3883: N=2 - LTC7841: 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. LTC2972, 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. LTC2972, LTC2974 and LTC2975 only. curr[N]_lowest Lowest output current. LTC2972, LTC2974 and LTC2975 only. curr[N]_highest Highest output current. curr[N]_reset_history Reset output current history. ======================= ========================================================