hwmon: (pmbus/ltc2978): Add support for LTC2978A

Detect LTC2978A chip ID. Treat it as LC2978.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/hwmon/pmbus/ltc2978.c b/drivers/hwmon/pmbus/ltc2978.c
index e05ff565ef61..de3c152a1d9a 100644
--- a/drivers/hwmon/pmbus/ltc2978.c
+++ b/drivers/hwmon/pmbus/ltc2978.c
@@ -57,6 +57,7 @@ enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3883 };
 #define LTC2977_ID                      0x0130
 #define LTC2978_ID_REV1                 0x0121
 #define LTC2978_ID_REV2                 0x0122
+#define LTC2978A_ID                     0x0124
 #define LTC3880_ID                      0x4000
 #define LTC3880_ID_MASK                 0xff00
 #define LTC3883_ID                      0x4300
@@ -397,7 +398,8 @@ static int ltc2978_probe(struct i2c_client *client,
                 data->id = ltc2974;
         } else if (chip_id == LTC2977_ID) {
                 data->id = ltc2977;
-        } else if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2) {
+        } else if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2 ||
+                   chip_id == LTC2978A_ID) {
                 data->id = ltc2978;
         } else if ((chip_id & LTC3880_ID_MASK) == LTC3880_ID) {
                 data->id = ltc3880;