| .. SPDX-License-Identifier: GPL-2.0 |
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| Kernel driver ltc2978 |
| ===================== |
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| Supported chips: |
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| * Linear Technology LTC2972 |
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| Prefix: 'ltc2972' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltc2972.html |
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| * Linear Technology LTC2974 |
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| Prefix: 'ltc2974' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltc2974 |
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| * Linear Technology LTC2975 |
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| Prefix: 'ltc2975' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltc2975 |
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| * Linear Technology LTC2977 |
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| Prefix: 'ltc2977' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltc2977 |
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| * Linear Technology LTC2978, LTC2978A |
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| Prefix: 'ltc2978' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltc2978 |
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| https://www.analog.com/en/products/ltc2978a |
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| * Linear Technology LTC2979 |
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| Prefix: 'ltc2979' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltc2979 |
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| * Linear Technology LTC2980 |
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| Prefix: 'ltc2980' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltc2980 |
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| * Linear Technology LTC3880 |
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| Prefix: 'ltc3880' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltc3880 |
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| * Linear Technology LTC3882 |
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| Prefix: 'ltc3882' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltc3882 |
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| * Linear Technology LTC3883 |
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| Prefix: 'ltc3883' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltc3883 |
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| * Linear Technology LTC3884 |
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| Prefix: 'ltc3884' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltc3884 |
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| * Linear Technology LTC3886 |
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| Prefix: 'ltc3886' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltc3886 |
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| * Linear Technology LTC3887 |
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| Prefix: 'ltc3887' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltc3887 |
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| * Linear Technology LTC3889 |
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| Prefix: 'ltc3889' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltc3889 |
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| * Linear Technology LTC7841 |
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| Prefix: 'ltc7841' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltc7841 |
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| * Linear Technology LTC7880 |
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| Prefix: 'ltc7880' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltc7880 |
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| * Linear Technology LTM2987 |
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| Prefix: 'ltm2987' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltm2987 |
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| * Linear Technology LTM4644 |
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| Prefix: 'ltm4644' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltm4644 |
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| * Linear Technology LTM4675 |
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| Prefix: 'ltm4675' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltm4675 |
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| * Linear Technology LTM4676 |
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| Prefix: 'ltm4676' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltm4676 |
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| * Linear Technology LTM4677 |
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| Prefix: 'ltm4677' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltm4677 |
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| * Linear Technology LTM4678 |
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| Prefix: 'ltm4678' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/en/products/ltm4678 |
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| * Analog Devices LTM4680 |
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| Prefix: 'ltm4680' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/ltm4680 |
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| * Analog Devices LTM4686 |
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| Prefix: 'ltm4686' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/ltm4686 |
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| * Analog Devices LTM4700 |
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| Prefix: 'ltm4700' |
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| Addresses scanned: - |
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| Datasheet: https://www.analog.com/ltm4700 |
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| Author: Guenter Roeck <linux@roeck-us.net> |
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| 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. |
| |
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| Usage Notes |
| ----------- |
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| This driver does not probe for PMBus devices. You will have to instantiate |
| devices explicitly. |
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| 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 |
| |
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| Sysfs attributes |
| ---------------- |
| |
| ======================= ======================================================== |
| 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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| LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, |
| LTC2979 and LTM2987 only. |
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| in1_lcrit Critical minimum input voltage. |
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| LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, |
| LTC2979 and LTM2987 only. |
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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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| LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, |
| LTC2979 and LTM2987 only. |
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| in1_lcrit_alarm Input voltage critical low alarm. |
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| LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, |
| LTC2979 and LTM2987 only. |
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| in1_crit_alarm Input voltage critical high alarm. |
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| in1_lowest Lowest input voltage. |
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| LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, |
| and LTM2987 only. |
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| in1_highest Highest input voltage. |
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| in1_reset_history Reset input voltage history. |
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| in[N]_label "vout[1-8]". |
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| - 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 |
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| in[N]_input Measured output voltage. |
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| in[N]_min Minimum output voltage. |
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| in[N]_max Maximum output voltage. |
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| in[N]_lcrit Critical minimum output voltage. |
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| in[N]_crit Critical maximum output voltage. |
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| in[N]_min_alarm Output voltage low alarm. |
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| in[N]_max_alarm Output voltage high alarm. |
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| in[N]_lcrit_alarm Output voltage critical low alarm. |
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| in[N]_crit_alarm Output voltage critical high alarm. |
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| in[N]_lowest Lowest output voltage. |
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| LTC2972, LTC2974, LTC2975,and LTC2978 only. |
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| in[N]_highest Highest output voltage. |
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| in[N]_reset_history Reset output voltage history. |
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| temp[N]_input Measured temperature. |
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| - 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. |
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| temp[N]_min Minimum temperature. |
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| LTC2972, LTC2974, LCT2977, LTM2980, LTC2978, |
| LTC2979, and LTM2987 only. |
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| temp[N]_max Maximum temperature. |
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| temp[N]_lcrit Critical low temperature. |
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| temp[N]_crit Critical high temperature. |
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| temp[N]_min_alarm Temperature low alarm. |
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| LTC2972, LTC2974, LTC2975, LTC2977, LTM2980, LTC2978, |
| LTC2979, and LTM2987 only. |
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| temp[N]_max_alarm Temperature high alarm. |
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| temp[N]_lcrit_alarm Temperature critical low alarm. |
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| temp[N]_crit_alarm Temperature critical high alarm. |
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| temp[N]_lowest Lowest measured temperature. |
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| - LTC2972, LTC2974, LTC2975, LTC2977, LTM2980, LTC2978, |
| LTC2979, and LTM2987 only. |
| - Not supported for chip temperature sensor on LTC2974 |
| and LTC2975. |
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| temp[N]_highest Highest measured temperature. |
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| Not supported for chip temperature sensor on |
| LTC2974 and LTC2975. |
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| temp[N]_reset_history Reset temperature history. |
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| Not supported for chip temperature sensor on |
| LTC2974 and LTC2975. |
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| power1_label "pin". LTC3883 and LTC3886 only. |
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| power1_input Measured input power. |
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| power[N]_label "pout[1-4]". |
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| - 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 |
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| power[N]_input Measured output power. |
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| curr1_label "iin". |
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| LTC3880, LTC3883, LTC3884, LTC3886, LTC3887, LTC3889, |
| LTM4644, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680, |
| and LTM4700 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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| curr1_highest Highest input current. |
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| LTC3883 and LTC3886 only. |
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| curr1_reset_history Reset input current history. |
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| LTC3883 and LTC3886 only. |
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| 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 |
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| curr[N]_input Measured output current. |
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| curr[N]_max Maximum output current. |
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| curr[N]_crit Critical high output current. |
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| curr[N]_lcrit Critical low output current. |
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| LTC2972, LTC2974 and LTC2975 only. |
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| curr[N]_max_alarm Output current high alarm. |
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| curr[N]_crit_alarm Output current critical high alarm. |
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| curr[N]_lcrit_alarm Output current critical low alarm. |
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| LTC2972, LTC2974 and LTC2975 only. |
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| curr[N]_lowest Lowest output current. |
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| LTC2972, LTC2974 and LTC2975 only. |
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| curr[N]_highest Highest output current. |
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| curr[N]_reset_history Reset output current history. |
| ======================= ======================================================== |
