hwmon: (ltc2978) Add support for LTC2975

LTC2975 is mostly compatible to LTC2974, but supports input current
and power measurement.

Tested-by: Michael Jones <mike@proclivis.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

2 files changed, 29 insertions, 21 deletions

diff --git a/Documentation/devicetree/bindings/hwmon/ltc2978.txt b/Documentation/devicetree/bindings/hwmon/ltc2978.txt
index c1d23c1..e434d5f 100644
--- a/Documentation/devicetree/bindings/hwmon/ltc2978.txt
+++ b/Documentation/devicetree/bindings/hwmon/ltc2978.txt
@@ -3,6 +3,7 @@ ltc2978
 Required properties:
 - compatible: should contain one of:
   * "lltc,ltc2974"
+  * "lltc,ltc2975"
   * "lltc,ltc2977"
   * "lltc,ltc2978"
   * "lltc,ltc3880"
@@ -19,7 +20,7 @@ Optional properties:
   standard binding for regulators; see regulator.txt.
 
 Valid names of regulators depend on number of supplies supported per device:
-  * ltc2974 : vout0 - vout3
+  * ltc2974, ltc2975 : vout0 - vout3
   * ltc2977 : vout0 - vout7
   * ltc2978 : vout0 - vout7
   * ltc3880, ltc3882 : vout0 - vout1
diff --git a/Documentation/hwmon/ltc2978 b/Documentation/hwmon/ltc2978
index ff13099..7e98288 100644
--- a/Documentation/hwmon/ltc2978
+++ b/Documentation/hwmon/ltc2978
@@ -6,6 +6,10 @@ Supported chips:
     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: -
@@ -42,7 +46,7 @@ Author: Guenter Roeck <linux@roeck-us.net>
 Description
 -----------
 
-LTC2974 is a quad digital power supply managers.
+LTC2974 and LTC2975 are quad digital power supply managers.
 LTC2978 is an octal power supply monitor.
 LTC2977 is a pin compatible replacement for LTC2978.
 LTC3880, LTC3882, and LTC3887 are dual output poly-phase step-down DC/DC
@@ -71,23 +75,23 @@ in1_label		"vin"
 in1_input		Measured input voltage.
 in1_min			Minimum input voltage.
 in1_max			Maximum input voltage.
-			LTC2974, LTC2977, and LTC2978 only.
+			LTC2974, LTC2975, LTC2977, and LTC2978 only.
 in1_lcrit		Critical minimum input voltage.
-			LTC2974, LTC2977, and LTC2978 only.
+			LTC2974, LTC2975, LTC2977, and LTC2978 only.
 in1_crit		Critical maximum input voltage.
 in1_min_alarm		Input voltage low alarm.
 in1_max_alarm		Input voltage high alarm.
-			LTC2974, LTC2977, and LTC2978 only.
+			LTC2974, LTC2975, LTC2977, and LTC2978 only.
 in1_lcrit_alarm		Input voltage critical low alarm.
-			LTC2974, LTC2977, and LTC2978 only.
+			LTC2974, LTC2975, LTC2977, and LTC2978 only.
 in1_crit_alarm		Input voltage critical high alarm.
 in1_lowest		Lowest input voltage.
-			LTC2974, LTC2977, and LTC2978 only.
+			LTC2974, LTC2975, LTC2977, and LTC2978 only.
 in1_highest		Highest input voltage.
 in1_reset_history	Reset input voltage history.
 
 in[N]_label		"vout[1-8]".
-			LTC2974: N=2-5
+			LTC2974, LTC2975: N=2-5
 			LTC2977: N=2-9
 			LTC2978: N=2-9
 			LTC3880, LTC3882, LTC3887, LTM4676: N=2-3
@@ -101,13 +105,14 @@ 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]_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, temp[1-4] report external temperatures,
-			and temp5 reports the chip temperature.
+			On LTC2974 and LTC2975, temp[1-4] report external
+			temperatures, and temp5 reports the chip temperature.
 			On LTC2977 and LTC2978, only one temperature measurement
 			is supported and reports the chip temperature.
 			On LTC3880, LTC3882, LTC3887, and LTM4676, temp1 and
@@ -120,23 +125,24 @@ 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, LTC2977, and LTC2978 only.
+			LTC2974, LTC2975, LTC2977, 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, LTC2977, and LTC2978 only.
-			Not supported for chip temperature sensor on LTC2974.
+			LTC2974, LTC2975, LTC2977, and LTC2978 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.
+			temperature sensor on LTC2974 and LTC2975.
 temp[N]_reset_history	Reset temperature history. Not supported for chip
-			temperature sensor on LTC2974.
+			temperature sensor on LTC2974 and LTC2975.
 
 power1_label		"pin". LTC3883 only.
 power1_input		Measured input power.
 
 power[N]_label		"pout[1-4]".
-			LTC2974: N=1-4
+			LTC2974, LTC2975: N=1-4
 			LTC2977: Not supported
 			LTC2978: Not supported
 			LTC3880, LTC3882, LTC3887, LTM4676: N=1-2
@@ -151,7 +157,7 @@ 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
+			LTC2974, LTC2975: N=1-4
 			LTC2977: not supported
 			LTC2978: not supported
 			LTC3880, LTC3882, LTC3887, LTM4676: N=2-3
@@ -159,10 +165,11 @@ curr[N]_label		"iout[1-4]".
 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]_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 only.
-curr[N]_lowest		Lowest output current. LTC2974 only.
+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.