hwmon: (pmbus/ltc2978) Add support for LTC2974 and LTC3883

Signed-off-by: Guenter Roeck <linux@roeck-us.net>

1 files changed, 86 insertions, 48 deletions

diff --git a/Documentation/hwmon/ltc2978 b/Documentation/hwmon/ltc2978
index dcb10be36e7f..dc0d08c61305 100644
--- a/Documentation/hwmon/ltc2978
+++ b/Documentation/hwmon/ltc2978
@@ -2,6 +2,10 @@ Kernel driver ltc2978
 =====================
 
 Supported chips:
+  * Linear Technology LTC2974
+    Prefix: 'ltc2974'
+    Addresses scanned: -
+    Datasheet: http://www.linear.com/product/ltc2974
   * Linear Technology LTC2978
     Prefix: 'ltc2978'
     Addresses scanned: -
@@ -10,6 +14,10 @@ Supported chips:
     Prefix: 'ltc3880'
     Addresses scanned: -
     Datasheet: http://www.linear.com/product/ltc3880
+  * Linear Technology LTC3883
+    Prefix: 'ltc3883'
+    Addresses scanned: -
+    Datasheet: http://www.linear.com/product/ltc3883
 
 Author: Guenter Roeck <linux@roeck-us.net>
 
@@ -17,9 +25,9 @@ Author: Guenter Roeck <linux@roeck-us.net>
 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.
+LTC2974 is a quad digital power supply manager. LTC2978 is an octal power supply
+monitor. LTC3880 is a dual output poly-phase step-down DC/DC controller. LTC3883
+is a single phase step-down DC/DC controller.
 
 
 Usage Notes
@@ -41,60 +49,90 @@ Sysfs attributes
 in1_label               "vin"
 in1_input               Measured input voltage.
 in1_min                 Minimum input voltage.
-in1_max                 Maximum input voltage. LTC2978 only.
-in1_lcrit               Critical minimum input voltage. LTC2978 only.
+in1_max                 Maximum input voltage. LTC2974 and LTC2978 only.
+in1_lcrit               Critical minimum input voltage. LTC2974 and LTC2978
+                        only.
 in1_crit                Critical maximum input voltage.
 in1_min_alarm           Input voltage low alarm.
-in1_max_alarm           Input voltage high alarm. LTC2978 only.
-in1_lcrit_alarm         Input voltage critical low alarm. LTC2978 only.
+in1_max_alarm           Input voltage high alarm. LTC2974 and LTC2978 only.
+in1_lcrit_alarm         Input voltage critical low alarm. LTC2974 and LTC2978
+                        only.
 in1_crit_alarm          Input voltage critical high alarm.
-in1_lowest              Lowest input voltage. LTC2978 only.
+in1_lowest              Lowest input voltage. LTC2974 and LTC2978 only.
 in1_highest             Highest input voltage.
 in1_reset_history       Reset input voltage history.
 
-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 output voltage history.
-
-temp[1-3]_input         Measured temperature.
+in[N]_label             "vout[1-8]".
+                        LTC2974: N=2-5
+                        LTC2978: N=2-9
+                        LTC3880: 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 and LTC2978 only.
+in[N]_highest           Highest output voltage.
+in[N]_reset_history     Reset output voltage history.
+
+temp[N]_input           Measured temperature.
+                        On LTC2974, temp[1-4] report external temperatures,
+                        and temp5 reports the chip temperature.
                         On LTC2978, only one temperature measurement is
                         supported and reports the chip temperature.
                         On LTC3880, temp1 and temp2 report external
-                        temperatures, and temp3 reports the chip
-                        temperature.
-temp[1-3]_min           Mimimum temperature. LTC2978 only.
-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     Temperature low alarm. LTC2978 only.
-temp[1-3]_max_alarm     Temperature high alarm.
-temp[1-3]_lcrit_alarm   Temperature critical low alarm.
-temp[1-3]_crit_alarm    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 temperature history.
-
-power[1-2]_label        "pout[1-2]". LTC3880 only.
-power[1-2]_input        Measured power.
-
-curr1_label             "iin". LTC3880 only.
+                        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 and LTC2978 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 and LTC2978 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 and LTC2978 only.
+                        Not supported for chip temperature sensor on LTC2974.
+temp[N]_highest         Highest measured temperature. Not supported for chip
+                        temperature sensor on LTC2974.
+temp[N]_reset_history   Reset temperature history. Not supported for chip
+                        temperature sensor on LTC2974.
+
+power1_label            "pin". LTC3883 only.
+power1_input            Measured input power.
+
+power[N]_label          "pout[1-4]".
+                        LTC2974: N=1-4
+                        LTC2978: Not supported
+                        LTC3880: N=1-2
+                        LTC3883: N=2
+power[N]_input          Measured output power.
+
+curr1_label             "iin". LTC3880 and LTC3883 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 output current.
-curr[2-3]_max           Maximum output current.
-curr[2-3]_crit          Critical output current.
-curr[2-3]_max_alarm     Output current high alarm.
-curr[2-3]_crit_alarm    Output current critical high alarm.
+curr1_highest           Highest input current. LTC3883 only.
+curr1_reset_history     Reset input current history. LTC3883 only.
+
+curr[N]_label           "iout[1-4]".
+                        LTC2974: N=1-4
+                        LTC2978: not supported
+                        LTC3880: 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 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 only.
+curr[N]_lowest          Lowest output current. LTC2974 only.
+curr[N]_highest         Highest output current.
+curr[N]_reset_history   Reset output current history.