hwmon: (pmbus/ltc2978) add support for ltc7841

Add support for LTC7841. The LTC7841 is a high performance
PolyPhase® single output synchronous boost converter controller.
Multiphase operation reduces input and output capacitor
requirements and allows the use of smaller inductors than the
single-phase equivalent.

The relevant registers in the LTC7841 are similar to the
LTC7880, only reduced by some amount. So it's just a matter of adding
the chip id. The device also doesn't support polling, on top of the
reduced register set, so a separate case for setting the chip info is
added.

Signed-off-by: Mariel Tinaco <Mariel.Tinaco@analog.com>
Message-ID: <20241029013734.293024-4-Mariel.Tinaco@analog.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index a4f02cad92fdadaafb15bb8459bf56f8e1722568..f6d3528419536a68011d67a4a239c0cba1bbf475 100644 (file)
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -224,9 +224,9 @@ config SENSORS_LTC2978_REGULATOR
        depends on SENSORS_LTC2978 && REGULATOR
        help
          If you say yes here you get regulator support for Linear Technology
-         LTC3880, LTC3883, LTC3884, LTC3886, LTC3887, LTC3889, LTC7880,
-         LTM4644, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680, LTM4686,
-         and LTM4700.
+         LTC3880, LTC3883, LTC3884, LTC3886, LTC3887, LTC3889, LTC7841,
+         LTC7880, LTM4644, 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 73a86f4d647288be97615f19a5c6314e4036e6a3..a6eb4d4b5487e049ce36f38374dea802618d4eff 100644 (file)
--- a/drivers/hwmon/pmbus/ltc2978.c
+++ b/drivers/hwmon/pmbus/ltc2978.c
@@ -23,7 +23,8 @@ enum chips {
        /* Managers */
        ltc2972, ltc2974, ltc2975, ltc2977, ltc2978, ltc2979, ltc2980,
        /* Controllers */
-       ltc3880, ltc3882, ltc3883, ltc3884, ltc3886, ltc3887, ltc3889, ltc7132, ltc7880,
+       ltc3880, ltc3882, ltc3883, ltc3884, ltc3886, ltc3887, ltc3889, ltc7132,
+       ltc7841, ltc7880,
        /* Modules */
        ltm2987, ltm4664, ltm4675, ltm4676, ltm4677, ltm4678, ltm4680, ltm4686,
        ltm4700,
@@ -50,7 +51,7 @@ enum chips {
 #define LTC3880_MFR_CLEAR_PEAKS                0xe3
 #define LTC3880_MFR_TEMPERATURE2_PEAK  0xf4
 
-/* LTC3883, LTC3884, LTC3886, LTC3889, LTC7132, LTC7880 */
+/* LTC3883, LTC3884, LTC3886, LTC3889, LTC7132, LTC7841 and LTC7880 only */
 #define LTC3883_MFR_IIN_PEAK           0xe1
 
 /* LTC2975 only */
@@ -80,6 +81,7 @@ enum chips {
 #define LTC3887_ID                     0x4700
 #define LTC3889_ID                     0x4900
 #define LTC7132_ID                     0x4CE0
+#define LTC7841_ID                     0x40D0
 #define LTC7880_ID                     0x49E0
 #define LTM2987_ID_A                   0x8010  /* A/B for two die IDs */
 #define LTM2987_ID_B                   0x8020
@@ -548,6 +550,7 @@ static const struct i2c_device_id ltc2978_id[] = {
        {"ltc3887", ltc3887},
        {"ltc3889", ltc3889},
        {"ltc7132", ltc7132},
+       {"ltc7841", ltc7841},
        {"ltc7880", ltc7880},
        {"ltm2987", ltm2987},
        {"ltm4664", ltm4664},
@@ -654,6 +657,8 @@ static int ltc2978_get_id(struct i2c_client *client)
                return ltc3889;
        else if (chip_id == LTC7132_ID)
                return ltc7132;
+       else if (chip_id == LTC7841_ID)
+               return ltc7841;
        else if (chip_id == LTC7880_ID)
                return ltc7880;
        else if (chip_id == LTM2987_ID_A || chip_id == LTM2987_ID_B)
@@ -854,6 +859,16 @@ static int ltc2978_probe(struct i2c_client *client)
                  | PMBUS_HAVE_POUT
                  | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
                break;
+       case ltc7841:
+               data->features |= FEAT_CLEAR_PEAKS;
+               info->read_word_data = ltc3883_read_word_data;
+               info->pages = LTC3883_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_TEMP | PMBUS_HAVE_STATUS_TEMP;
+               break;
        default:
                return -ENODEV;
        }
@@ -907,6 +922,7 @@ static const struct of_device_id ltc2978_of_match[] = {
        { .compatible = "lltc,ltc3887" },
        { .compatible = "lltc,ltc3889" },
        { .compatible = "lltc,ltc7132" },
+       { .compatible = "lltc,ltc7841" },
        { .compatible = "lltc,ltc7880" },
        { .compatible = "lltc,ltm2987" },
        { .compatible = "lltc,ltm4664" },