[PATCH v3] hwmon: (lm75) Add support for Nuvoton NCT7715
From: <hidden>
Date: 2026-09-15 05:20:42
Also in:
linux-devicetree, linux-hwmon, lkml
Subsystem:
documentation, hardware monitoring, open firmware and flattened device tree bindings, the rest · Maintainers:
Jonathan Corbet, Guenter Roeck, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
From: Sheng-Yuan Huang <redacted> The Nuvoton NCT7715 is compatible with the LM75 temperature and limit register layout. Its 16-bit configuration register shares the TMP112 configuration layout. Signed-off-by: Sheng-Yuan Huang <redacted> --- v3: - Reuse the existing TMP112 handling for NCT7715 configuration, update intervals, and alarms. v2: - Use the standard SMBus word representation for the NCT7715 configuration register, removing the NCT7715-specific byte swapping and updating its configuration masks accordingly. .../devicetree/bindings/hwmon/lm75.yaml | 2 ++ Documentation/hwmon/lm75.rst | 6 ++++++ drivers/hwmon/lm75.c | 21 ++++++++++++++++++- 3 files changed, 28 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/hwmon/lm75.yaml b/Documentation/devicetree/bindings/hwmon/lm75.yaml
index b48bf3fd721f..d55b8b7e49c5 100644
--- a/Documentation/devicetree/bindings/hwmon/lm75.yaml
+++ b/Documentation/devicetree/bindings/hwmon/lm75.yaml@@ -31,6 +31,7 @@ properties: - nxp,p3t1750 - nxp,p3t1755 - nxp,pct2075 + - nuvoton,nct7715 - st,stds75 - st,stlm75 - microchip,tcn75
@@ -78,6 +79,7 @@ allOf: - ti,tmp101 - ti,tmp112 - ti,tmp75 + - nuvoton,nct7715 then: properties: interrupts: false
diff --git a/Documentation/hwmon/lm75.rst b/Documentation/hwmon/lm75.rst
index ca46754e028b..fac0b8f29ddc 100644
--- a/Documentation/hwmon/lm75.rst
+++ b/Documentation/hwmon/lm75.rst@@ -150,6 +150,12 @@ Supported chips: https://ams.com/documents/20143/36005/AS6200_DS000449_4-00.pdf + * Nuvoton NCT7715 + + Prefix: 'nct7715' + + Addresses scanned: none + Author: Frodo Looijaard <frodol@dds.nl> Description
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index 2d2d752aeac9..1a98ecb142c9 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c@@ -39,6 +39,7 @@ enum lm75_type { /* keep sorted in alphabetical order */ max6626, max31725, mcp980x, + nct7715, p3t1750, p3t1755, pct2075,
@@ -259,6 +260,16 @@ static const struct lm75_params device_params[] = { .sample_times = (unsigned int []){ 30, 60, 120, 240 }, .resolutions = (u8 []) {9, 10, 11, 12 }, }, + [nct7715] = { + .config_reg_16bits = true, + .set_mask = 0x8060, /* 12-bit mode, 4 samples / second */ + .clr_mask = 1 << 7, /* no one-shot mode */ + .default_resolution = 12, + .default_sample_time = 250, + .num_sample_times = 4, + .sample_times = (unsigned int []){ 125, 250, 1000, 4000 }, + .alarm = true, + }, [tmp100] = { .set_mask = 3 << 5, /* 12-bit mode */ .clr_mask = 1 << 7, /* not one-shot mode */
@@ -417,6 +428,7 @@ static int lm75_read(struct device *dev, enum hwmon_sensor_types type, if (attr == hwmon_temp_alarm) { switch (data->kind) { case as6200: + case nct7715: case tmp112: *val = !!(regval & BIT(13)) == !!(regval & BIT(2)); break;
@@ -486,6 +498,7 @@ static int lm75_update_interval(struct device *dev, long val) if (data->params->resolutions) data->resolution = data->params->resolutions[index]; break; + case nct7715: case tmp112: case as6200: err = regmap_update_bits(data->regmap, LM75_REG_CONF,
@@ -848,6 +861,7 @@ static const struct i2c_device_id lm75_i2c_ids[] = { { .name = "max31725", .driver_data = max31725 }, { .name = "max31726", .driver_data = max31725 }, { .name = "mcp980x", .driver_data = mcp980x }, + { .name = "nct7715", .driver_data = nct7715 }, { .name = "p3t1750", .driver_data = p3t1750 }, { .name = "p3t1755", .driver_data = p3t1755 }, { .name = "pct2075", .driver_data = pct2075 },
@@ -972,6 +986,10 @@ static const struct of_device_id lm75_of_match[] = { .compatible = "nxp,pct2075", .data = (void *)pct2075 }, + { + .compatible = "nuvoton,nct7715", + .data = (void *)nct7715 + }, { .compatible = "st,stds75", .data = (void *)stds75
@@ -1129,7 +1147,8 @@ static int lm75_suspend(struct device *dev) { struct lm75_data *data = dev_get_drvdata(dev); - return regmap_update_bits(data->regmap, LM75_REG_CONF, LM75_SHUTDOWN, LM75_SHUTDOWN); + return regmap_update_bits(data->regmap, LM75_REG_CONF, + LM75_SHUTDOWN, LM75_SHUTDOWN); } static int lm75_resume(struct device *dev)
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2.43.0