[PATCH 2/3] hwmon: (pmbus/ltc2978) Add support for LT7175 and LT7176P
From: Christopher de Guzman
Date: Tue Oct 20 2026 - 07:47:13 EST
Add support for LT7175/LT7175-1 and LT7176P/LT7176P-1 PMBus buck
regulators. These parts share the LT7170 family MFR_SPECIAL_ID
(0x1C1D masked to 0x1C10) and use the same PMBus register layout,
so they reuse the existing lt7170/lt7171 probe path. Variants are
distinguished by reading the PMBUS_IC_DEVICE_ID ASCII string.
Signed-off-by: Christopher de Guzman <christopher.deguzman@xxxxxxxxxx>
---
drivers/hwmon/pmbus/Kconfig | 6 +++---
drivers/hwmon/pmbus/ltc2978.c | 28 +++++++++++++++++++++++++++-
2 files changed, 30 insertions(+), 4 deletions(-)
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index fd6641316454..63fb4d5dd87d 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -306,9 +306,9 @@ config SENSORS_LTC2978_REGULATOR
depends on SENSORS_LTC2978 && REGULATOR
help
If you say yes here you get regulator support for Linear Technology
- LT7170, LT7171, LTC3880, LTC3883, LTC3884, LTC3886, LTC3887, LTC3889,
- LTC7841, LTC7880, LTM4644, LTM4673, LTM4675, LTM4676, LTM4677,
- LTM4678, LTM4680, LTM4686, and LTM4700.
+ LT7170, LT7171, LT7175, LT7176P, LTC3880, LTC3883, LTC3884, LTC3886,
+ LTC3887, LTC3889, LTC7841, LTC7880, LTM4644, LTM4673, LTM4675, LTM4676,
+ LTM4677, LTM4678, LTM4680, LTM4686, and LTM4700.
config SENSORS_LTC3815
tristate "Linear Technologies LTC3815"
diff --git a/drivers/hwmon/pmbus/ltc2978.c b/drivers/hwmon/pmbus/ltc2978.c
index aea7b6c93e74..a42cdc1fe124 100644
--- a/drivers/hwmon/pmbus/ltc2978.c
+++ b/drivers/hwmon/pmbus/ltc2978.c
@@ -23,7 +23,7 @@ enum chips {
/* Managers */
ltc2972, ltc2974, ltc2975, ltc2977, ltc2978, ltc2979, ltc2980,
/* Controllers */
- lt7170, lt7171, ltc3880, ltc3882, ltc3883, ltc3884, ltc3886, ltc3887,
+ lt7170, lt7171, lt7175, lt7176p, ltc3880, ltc3882, ltc3883, ltc3884, ltc3886, ltc3887,
ltc3889, ltc7132, ltc7841, ltc7880,
/* Modules */
ltm2987, ltm4664, ltm4673, ltm4675, ltm4676, ltm4677, ltm4678, ltm4680,
@@ -540,6 +540,10 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page,
static const struct i2c_device_id ltc2978_id[] = {
{ .name = "lt7170", .driver_data = lt7170 },
{ .name = "lt7171", .driver_data = lt7171 },
+ { .name = "lt7175", .driver_data = lt7175 },
+ { .name = "lt7175-1", .driver_data = lt7175 },
+ { .name = "lt7176p", .driver_data = lt7176p },
+ { .name = "lt7176p-1", .driver_data = lt7176p },
{ .name = "ltc2972", .driver_data = ltc2972 },
{ .name = "ltc2974", .driver_data = ltc2974 },
{ .name = "ltc2975", .driver_data = ltc2975 },
@@ -645,6 +649,10 @@ static int ltc2978_get_id(struct i2c_client *client)
return lt7170;
if (!strncmp(buf, "LT7171", 6))
return lt7171;
+ if (!strncmp(buf, "LT7175", 6))
+ return lt7175;
+ if (!strncmp(buf, "LT7176P", 7))
+ return lt7176p;
return -ENODEV;
}
@@ -774,6 +782,20 @@ static int ltc2978_probe(struct i2c_client *client)
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
break;
+ case lt7175:
+ case lt7176p:
+ data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING;
+ info->read_word_data = ltc3883_read_word_data;
+ info->pages = LTC3883_NUM_PAGES;
+ info->format[PSC_VOLTAGE_IN] = ieee754;
+ info->format[PSC_VOLTAGE_OUT] = ieee754;
+ info->format[PSC_CURRENT_OUT] = ieee754;
+ info->format[PSC_TEMPERATURE] = ieee754;
+ info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
+ | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+ | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
+ break;
case ltc2972:
info->read_word_data = ltc2975_read_word_data;
info->pages = LTC2972_NUM_PAGES;
@@ -962,6 +984,10 @@ static int ltc2978_probe(struct i2c_client *client)
static const struct of_device_id ltc2978_of_match[] = {
{ .compatible = "lltc,lt7170" },
{ .compatible = "lltc,lt7171" },
+ { .compatible = "lltc,lt7175" },
+ { .compatible = "lltc,lt7175-1" },
+ { .compatible = "lltc,lt7176p" },
+ { .compatible = "lltc,lt7176p-1" },
{ .compatible = "lltc,ltc2972" },
{ .compatible = "lltc,ltc2974" },
{ .compatible = "lltc,ltc2975" },
--
2.43.0