hwmon: (pmbus/ltc2978): Add support for LTC2977
LTC2977 is a pin compatible replacement for LTC2978.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
diff --git a/Documentation/hwmon/ltc2978 b/Documentation/hwmon/ltc2978
index dc0d08c..6934936 100644
--- a/Documentation/hwmon/ltc2978
+++ b/Documentation/hwmon/ltc2978
@@ -6,6 +6,10 @@
Prefix: 'ltc2974'
Addresses scanned: -
Datasheet: http://www.linear.com/product/ltc2974
+ * Linear Technology LTC2977
+ Prefix: 'ltc2977'
+ Addresses scanned: -
+ Datasheet: http://www.linear.com/product/ltc2977
* Linear Technology LTC2978
Prefix: 'ltc2978'
Addresses scanned: -
@@ -26,8 +30,9 @@
-----------
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.
+monitor. LTC2977 is a pin compatible replacement for LTC2978. LTC3880 is a dual
+output poly-phase step-down DC/DC controller. LTC3883 is a single phase
+step-down DC/DC controller.
Usage Notes
@@ -49,21 +54,25 @@
in1_label "vin"
in1_input Measured input voltage.
in1_min Minimum input voltage.
-in1_max Maximum input voltage. LTC2974 and LTC2978 only.
-in1_lcrit Critical minimum input voltage. LTC2974 and LTC2978
- only.
+in1_max Maximum input voltage.
+ LTC2974, LTC2977, and LTC2978 only.
+in1_lcrit Critical minimum input voltage.
+ LTC2974, 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 and LTC2978 only.
-in1_lcrit_alarm Input voltage critical low alarm. LTC2974 and LTC2978
- only.
+in1_max_alarm Input voltage high alarm.
+ LTC2974, LTC2977, and LTC2978 only.
+in1_lcrit_alarm Input voltage critical low alarm.
+ LTC2974, LTC2977, and LTC2978 only.
in1_crit_alarm Input voltage critical high alarm.
-in1_lowest Lowest input voltage. LTC2974 and LTC2978 only.
+in1_lowest Lowest input voltage.
+ LTC2974, 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
+ LTC2977: N=2-9
LTC2978: N=2-9
LTC3880: N=2-3
LTC3883: N=2
@@ -83,21 +92,23 @@
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 LTC2977 and 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.
On LTC3883, temp1 reports an external temperature,
and temp2 reports the chip temperature.
-temp[N]_min Mimimum temperature. LTC2974 and LTC2978 only.
+temp[N]_min Mimimum temperature. LTC2974, LCT2977, 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]_min_alarm Temperature low alarm.
+ LTC2974, 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 and LTC2978 only.
+temp[N]_lowest Lowest measured temperature.
+ LTC2974, LTC2977, 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.
@@ -109,6 +120,7 @@
power[N]_label "pout[1-4]".
LTC2974: N=1-4
+ LTC2977: Not supported
LTC2978: Not supported
LTC3880: N=1-2
LTC3883: N=2
@@ -123,6 +135,7 @@
curr[N]_label "iout[1-4]".
LTC2974: N=1-4
+ LTC2977: not supported
LTC2978: not supported
LTC3880: N=2-3
LTC3883: N=2
diff --git a/drivers/hwmon/pmbus/ltc2978.c b/drivers/hwmon/pmbus/ltc2978.c
index 586a89e..e05ff56 100644
--- a/drivers/hwmon/pmbus/ltc2978.c
+++ b/drivers/hwmon/pmbus/ltc2978.c
@@ -1,5 +1,6 @@
/*
- * Hardware monitoring driver for LTC2974, LTC2978, LTC3880, and LTC3883
+ * Hardware monitoring driver for LTC2974, LTC2977, LTC2978, LTC3880,
+ * and LTC3883
*
* Copyright (c) 2011 Ericsson AB.
* Copyright (c) 2013 Guenter Roeck
@@ -27,7 +28,7 @@
#include <linux/i2c.h>
#include "pmbus.h"
-enum chips { ltc2974, ltc2978, ltc3880, ltc3883 };
+enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3883 };
/* Common for all chips */
#define LTC2978_MFR_VOUT_PEAK 0xdd
@@ -35,7 +36,7 @@
#define LTC2978_MFR_TEMPERATURE_PEAK 0xdf
#define LTC2978_MFR_SPECIAL_ID 0xe7
-/* LTC2974 and LTC2978 */
+/* LTC2974, LCT2977, and LTC2978 */
#define LTC2978_MFR_VOUT_MIN 0xfb
#define LTC2978_MFR_VIN_MIN 0xfc
#define LTC2978_MFR_TEMPERATURE_MIN 0xfd
@@ -53,6 +54,7 @@
#define LTC3883_MFR_IIN_PEAK 0xe1
#define LTC2974_ID 0x0212
+#define LTC2977_ID 0x0130
#define LTC2978_ID_REV1 0x0121
#define LTC2978_ID_REV2 0x0122
#define LTC3880_ID 0x4000
@@ -363,6 +365,7 @@
static const struct i2c_device_id ltc2978_id[] = {
{"ltc2974", ltc2974},
+ {"ltc2977", ltc2977},
{"ltc2978", ltc2978},
{"ltc3880", ltc3880},
{"ltc3883", ltc3883},
@@ -392,6 +395,8 @@
if (chip_id == LTC2974_ID) {
data->id = ltc2974;
+ } else if (chip_id == LTC2977_ID) {
+ data->id = ltc2977;
} else if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2) {
data->id = ltc2978;
} else if ((chip_id & LTC3880_ID_MASK) == LTC3880_ID) {
@@ -438,6 +443,7 @@
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
}
break;
+ case ltc2977:
case ltc2978:
info->read_word_data = ltc2978_read_word_data;
info->pages = LTC2978_NUM_PAGES;