hwmon: (ltc2978) Add support for LTC3886

LTC3886 is a is a dual PolyPhase DC/DC synchronous step-down switching
regulator controller. It is mostly command compatible to LTC3883,
but supports two phases instead of one.

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, 23 insertions, 3 deletions

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index af778aed4033..5ebc36255c88 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -53,7 +53,7 @@ config SENSORS_LTC2978
         help
           If you say yes here you get hardware monitoring support for Linear
           Technology LTC2974, LTC2975, LTC2977, LTC2978, LTC2980, LTC3880,
-          LTC3883, LTC3887, LTCM2987, and LTM4676.
+          LTC3883, LTC3886, 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 48dcde0bc740..60fe8f9839d3 100644
--- a/drivers/hwmon/pmbus/ltc2978.c
+++ b/drivers/hwmon/pmbus/ltc2978.c
@@ -25,7 +25,7 @@
 #include "pmbus.h"
 
 enum chips { ltc2974, ltc2975, ltc2977, ltc2978, ltc2980, ltc3880, ltc3882,
-        ltc3883, ltc3887, ltm2987, ltm4676 };
+        ltc3883, ltc3886, ltc3887, ltm2987, ltm4676 };
 
 /* Common for all chips */
 #define LTC2978_MFR_VOUT_PEAK           0xdd
@@ -47,7 +47,7 @@ enum chips { ltc2974, ltc2975, ltc2977, ltc2978, ltc2980, ltc3880, ltc3882,
 #define LTC3880_MFR_CLEAR_PEAKS         0xe3
 #define LTC3880_MFR_TEMPERATURE2_PEAK   0xf4
 
-/* LTC3883 only */
+/* LTC3883 and LTC3886 only */
 #define LTC3883_MFR_IIN_PEAK            0xe1
 
 /* LTC2975 only */
@@ -69,6 +69,7 @@ enum chips { ltc2974, ltc2975, ltc2977, ltc2978, ltc2980, ltc3880, ltc3882,
 #define LTC3882_ID                      0x4200
 #define LTC3882_ID_D1                   0x4240  /* Dash 1 */
 #define LTC3883_ID                      0x4300
+#define LTC3886_ID                      0x4600
 #define LTC3887_ID                      0x4700
 #define LTM2987_ID_A                    0x8010  /* A/B for two die IDs */
 #define LTM2987_ID_B                    0x8020
@@ -417,6 +418,7 @@ static const struct i2c_device_id ltc2978_id[] = {
         {"ltc3880", ltc3880},
         {"ltc3882", ltc3882},
         {"ltc3883", ltc3883},
+        {"ltc3886", ltc3886},
         {"ltc3887", ltc3887},
         {"ltm2987", ltm2987},
         {"ltm4676", ltm4676},
@@ -485,6 +487,8 @@ static int ltc2978_get_id(struct i2c_client *client)
                 return ltc3882;
         else if (chip_id == LTC3883_ID)
                 return ltc3883;
+        else if (chip_id == LTC3886_ID)
+                return ltc3886;
         else if (chip_id == LTC3887_ID)
                 return ltc3887;
         else if (chip_id == LTM2987_ID_A || chip_id == LTM2987_ID_B)
@@ -624,6 +628,21 @@ static int ltc2978_probe(struct i2c_client *client,
                   | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
                   | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
                 break;
+        case ltc3886:
+                data->features |= FEAT_CLEAR_PEAKS;
+                info->read_word_data = ltc3883_read_word_data;
+                info->pages = LTC3880_NUM_PAGES;
+                info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
+                  | PMBUS_HAVE_STATUS_INPUT
+                  | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+                  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+                  | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
+                  | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
+                info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+                  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+                  | PMBUS_HAVE_POUT
+                  | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
+                break;
         default:
                 return -ENODEV;
         }
@@ -650,6 +669,7 @@ static const struct of_device_id ltc2978_of_match[] = {
         { .compatible = "lltc,ltc3880" },
         { .compatible = "lltc,ltc3882" },
         { .compatible = "lltc,ltc3883" },
+        { .compatible = "lltc,ltc3886" },
         { .compatible = "lltc,ltc3887" },
         { .compatible = "lltc,ltm2987" },
         { .compatible = "lltc,ltm4676" },