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Dev/lm75 add max31875 #2751

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439c116
dt-bindings: hwmon: Add Analog Devices Inc. MAX31875
jemfgeronimo Mar 24, 2025
004ae13
hwmon: (lm75) Add ADI MAX31875 support
jemfgeronimo Mar 24, 2025
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1 change: 1 addition & 0 deletions Documentation/devicetree/bindings/hwmon/lm75.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@ properties:
compatible:
enum:
- adi,adt75
- adi,max31875
- atmel,at30ts74
- dallas,ds1775
- dallas,ds75
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6 changes: 4 additions & 2 deletions Documentation/hwmon/lm75.rst
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Expand Up @@ -63,16 +63,18 @@ Supported chips:

http://www.microchip.com/

* Analog Devices ADT75
* Analog Devices ADT75, MAX31875

Prefix: 'adt75'
Prefix: 'adt75', 'max31875'

Addresses scanned: none

Datasheet: Publicly available at the Analog Devices website

https://www.analog.com/adt75

https://www.analog.com/max31875

* ST Microelectronics STDS75

Prefix: 'stds75'
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2 changes: 1 addition & 1 deletion drivers/hwmon/Kconfig
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Expand Up @@ -1338,7 +1338,7 @@ config SENSORS_LM75
If you say yes here you get support for one common type of
temperature sensor chip, with models including:

- Analog Devices ADT75
- Analog Devices ADT75, MAX31875
- Atmel (now Microchip) AT30TS74
- Dallas Semiconductor DS75, DS1775 and DS7505
- Global Mixed-mode Technology (GMT) G751
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20 changes: 20 additions & 0 deletions drivers/hwmon/lm75.c
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Expand Up @@ -36,6 +36,7 @@ enum lm75_type { /* keep sorted in alphabetical order */
max6625,
max6626,
max31725,
max31875,
mcp980x,
pct2075,
stds75,
Expand Down Expand Up @@ -204,6 +205,13 @@ static const struct lm75_params device_params[] = {
.default_resolution = 16,
.default_sample_time = MSEC_PER_SEC / 20,
},
[max31875] = {
.default_resolution = 10,
.resolutions = (u8 []) {8, 9, 10, 12 },
.default_sample_time = 4000,
.num_sample_times = 4,
.sample_times = (unsigned int []){ 125, 250, 1000, 4000 },
},
[tcn75] = {
.default_resolution = 9,
.default_sample_time = MSEC_PER_SEC / 18,
Expand Down Expand Up @@ -446,6 +454,13 @@ static int lm75_update_interval(struct device *dev, long val)
return err;
data->sample_time = data->params->sample_times[index];
break;
case max31875:
err = regmap_update_bits(data->regmap, LM75_REG_CONF,
0x0600, (3 - index) << 9);
if (err < 0)
return err;
data->sample_time = data->params->sample_times[index];
break;
case pct2075:
err = i2c_smbus_write_byte_data(data->client, PCT2075_REG_IDLE,
index + 1);
Expand Down Expand Up @@ -665,6 +680,7 @@ static const struct i2c_device_id lm75_ids[] = {
{ "max6626", max6626, },
{ "max31725", max31725, },
{ "max31726", max31725, },
{ "max31875", max31875, },
{ "mcp980x", mcp980x, },
{ "pct2075", pct2075, },
{ "stds75", stds75, },
Expand All @@ -689,6 +705,10 @@ static const struct of_device_id __maybe_unused lm75_of_match[] = {
.compatible = "adi,adt75",
.data = (void *)adt75
},
{
.compatible = "adi,max31875",
.data = (void *)max31875
},
{
.compatible = "atmel,at30ts74",
.data = (void *)at30ts74
Expand Down