hwmon: (pmbus/ltc2978) Add support for LTC3880 to LTC2978 driver

The LTC3880 PMBus command set is comparable to LTC2978. Add support for it
to the LTC2978 driver.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>

1 files changed, 41 insertions, 16 deletions

diff --git a/Documentation/hwmon/ltc2978 b/Documentation/hwmon/ltc2978
index 499129e11897..c365f9beb5dd 100644
--- a/Documentation/hwmon/ltc2978
+++ b/Documentation/hwmon/ltc2978
@@ -6,6 +6,10 @@ Supported chips:
     Prefix: 'ltc2978'
     Addresses scanned: -
     Datasheet: http://cds.linear.com/docs/Datasheet/2978fa.pdf
+  * Linear Technology LTC3880
+    Prefix: 'ltc3880'
+    Addresses scanned: -
+    Datasheet: http://cds.linear.com/docs/Datasheet/3880f.pdf
 
 Author: Guenter Roeck <guenter.roeck@ericsson.com>
 
@@ -14,7 +18,8 @@ Description
 -----------
 
 The LTC2978 is an octal power supply monitor, supervisor, sequencer and
-margin controller.
+margin controller. The LTC3880 is a dual, PolyPhase DC/DC synchronous
+step-down switching regulator controller.
 
 
 Usage Notes
@@ -43,12 +48,12 @@ in1_min_alarm		Input voltage low alarm.
 in1_max_alarm           Input voltage high alarm.
 in1_lcrit_alarm         Input voltage critical low alarm.
 in1_crit_alarm          Input voltage critical high alarm.
-in1_lowest              Lowest input voltage.
+in1_lowest              Lowest input voltage. LTC2978 only.
 in1_highest             Highest input voltage.
 in1_reset_history       Reset history. Writing into this attribute will reset
                         history for all attributes.
 
-in[2-9]_label           "vout[1-8]".
+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.
@@ -58,21 +63,41 @@ 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.
+in[2-9]_lowest          Lowest output voltage. LTC2978 only.
 in[2-9]_highest         Lowest output voltage.
 in[2-9]_reset_history   Reset history. Writing into this attribute will reset
                         history for all attributes.
 
-temp1_input             Measured temperature.
-temp1_min               Mimimum temperature.
-temp1_max               Maximum temperature.
-temp1_lcrit             Critical low temperature.
-temp1_crit              Critical high temperature.
-temp1_min_alarm         Chip temperature low alarm.
-temp1_max_alarm         Chip temperature high alarm.
-temp1_lcrit_alarm       Chip temperature critical low alarm.
-temp1_crit_alarm        Chip temperature critical high alarm.
-temp1_lowest            Lowest measured temperature.
-temp1_highest           Highest measured temperature.
-temp1_reset_history     Reset history. Writing into this attribute will reset
+temp[1-3]_input         Measured temperature.
+                        On LTC2978, only one temperature measurement is
+                        supported and reflects the internal temperature.
+                        On LTC3880, temp1 and temp2 report external
+                        temperatures, and temp3 reports the internal
+                        temperature.
+temp[1-3]_min           Mimimum temperature.
+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     Chip temperature low alarm.
+temp[1-3]_max_alarm     Chip temperature high alarm.
+temp[1-3]_lcrit_alarm   Chip temperature critical low alarm.
+temp[1-3]_crit_alarm    Chip 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 history. Writing into this attribute will reset
                         history for all attributes.
+
+power[1-2]_label        "pout[1-2]". LTC3880 only.
+power[1-2]_input        Measured power.
+
+curr1_label             "iin". LTC3880 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 input current.
+curr[2-3]_max           Maximum input current.
+curr[2-3]_crit          Critical input current.
+curr[2-3]_max_alarm     Input current high alarm.
+curr[2-3]_crit_alarm    Input current critical high alarm.