hwmon: (ltc2978) Add support for LTC2980 and LTM2987

LTC2980 and LTM2987 are command compatible to LTC2977. They consist of
two LTC2977 on a single die, and are instantiated as two separate chips,
each supporting eight channels.

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

2 files changed, 19 insertions, 5 deletions

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 8279727987cb..af778aed4033 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -52,8 +52,8 @@ config SENSORS_LTC2978
         default n
         help
           If you say yes here you get hardware monitoring support for Linear
-          Technology LTC2974, LTC2975, LTC2977, LTC2978, LTC3880, LTC3883,
-          LTC3887, and LTM4676.
+          Technology LTC2974, LTC2975, LTC2977, LTC2978, LTC2980, LTC3880,
+          LTC3883, LTC3887, LTCM2987, and LTM4676.
 
           This driver can also be built as a module. If so, the module will
           be called ltc2978.
diff --git a/drivers/hwmon/pmbus/ltc2978.c b/drivers/hwmon/pmbus/ltc2978.c
index e9d3f828fe46..48dcde0bc740 100644
--- a/drivers/hwmon/pmbus/ltc2978.c
+++ b/drivers/hwmon/pmbus/ltc2978.c
@@ -24,8 +24,8 @@
 #include <linux/regulator/driver.h>
 #include "pmbus.h"
 
-enum chips { ltc2974, ltc2975, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883,
-             ltc3887, ltm4676 };
+enum chips { ltc2974, ltc2975, ltc2977, ltc2978, ltc2980, ltc3880, ltc3882,
+        ltc3883, ltc3887, ltm2987, ltm4676 };
 
 /* Common for all chips */
 #define LTC2978_MFR_VOUT_PEAK           0xdd
@@ -33,7 +33,7 @@ enum chips { ltc2974, ltc2975, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883,
 #define LTC2978_MFR_TEMPERATURE_PEAK    0xdf
 #define LTC2978_MFR_SPECIAL_ID          0xe7    /* Undocumented on LTC3882 */
 
-/* LTC2974, LTC2975, LCT2977, and LTC2978 */
+/* LTC2974, LTC2975, LCT2977, LTC2980, LTC2978, and LTM2987 */
 #define LTC2978_MFR_VOUT_MIN            0xfb
 #define LTC2978_MFR_VIN_MIN             0xfc
 #define LTC2978_MFR_TEMPERATURE_MIN     0xfd
@@ -63,11 +63,15 @@ enum chips { ltc2974, ltc2975, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883,
 #define LTC2977_ID                      0x0130
 #define LTC2978_ID_REV1                 0x0110  /* Early revision */
 #define LTC2978_ID_REV2                 0x0120
+#define LTC2980_ID_A                    0x8030  /* A/B for two die IDs */
+#define LTC2980_ID_B                    0x8040
 #define LTC3880_ID                      0x4020
 #define LTC3882_ID                      0x4200
 #define LTC3882_ID_D1                   0x4240  /* Dash 1 */
 #define LTC3883_ID                      0x4300
 #define LTC3887_ID                      0x4700
+#define LTM2987_ID_A                    0x8010  /* A/B for two die IDs */
+#define LTM2987_ID_B                    0x8020
 #define LTM4676_ID_REV1                 0x4400
 #define LTM4676_ID_REV2                 0x4480
 #define LTM4676A_ID                     0x47e0
@@ -409,10 +413,12 @@ static const struct i2c_device_id ltc2978_id[] = {
         {"ltc2975", ltc2975},
         {"ltc2977", ltc2977},
         {"ltc2978", ltc2978},
+        {"ltc2980", ltc2980},
         {"ltc3880", ltc3880},
         {"ltc3882", ltc3882},
         {"ltc3883", ltc3883},
         {"ltc3887", ltc3887},
+        {"ltm2987", ltm2987},
         {"ltm4676", ltm4676},
         {}
 };
@@ -471,6 +477,8 @@ static int ltc2978_get_id(struct i2c_client *client)
                 return ltc2977;
         else if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2)
                 return ltc2978;
+        else if (chip_id == LTC2980_ID_A || chip_id == LTC2980_ID_B)
+                return ltc2980;
         else if (chip_id == LTC3880_ID)
                 return ltc3880;
         else if (chip_id == LTC3882_ID || chip_id == LTC3882_ID_D1)
@@ -479,6 +487,8 @@ static int ltc2978_get_id(struct i2c_client *client)
                 return ltc3883;
         else if (chip_id == LTC3887_ID)
                 return ltc3887;
+        else if (chip_id == LTM2987_ID_A || chip_id == LTM2987_ID_B)
+                return ltm2987;
         else if (chip_id == LTM4676_ID_REV1 || chip_id == LTM4676_ID_REV2 ||
                  chip_id == LTM4676A_ID)
                 return ltm4676;
@@ -559,6 +569,8 @@ static int ltc2978_probe(struct i2c_client *client,
                 break;
         case ltc2977:
         case ltc2978:
+        case ltc2980:
+        case ltm2987:
                 info->read_word_data = ltc2978_read_word_data;
                 info->pages = LTC2978_NUM_PAGES;
                 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
@@ -634,10 +646,12 @@ static const struct of_device_id ltc2978_of_match[] = {
         { .compatible = "lltc,ltc2975" },
         { .compatible = "lltc,ltc2977" },
         { .compatible = "lltc,ltc2978" },
+        { .compatible = "lltc,ltc2980" },
         { .compatible = "lltc,ltc3880" },
         { .compatible = "lltc,ltc3882" },
         { .compatible = "lltc,ltc3883" },
         { .compatible = "lltc,ltc3887" },
+        { .compatible = "lltc,ltm2987" },
         { .compatible = "lltc,ltm4676" },
         { }
 };