Re: [PATCH v4 2/2] hwmon: (lm75) Add support for Nuvoton NCT7715

[Guenter Roeck <linux@roeck-us.net>]

On 9/18/26 01:40, hsyemail2@gmail.com wrote:
> From: Sheng-Yuan Huang <syhuang3@nuvoton.com>
> 
> 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 <syhuang3@nuvoton.com>


For my reference (waiting for DT patch approval):

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

Thanks,
Guenter

> ---
> v4:
> - Correct NCT7715 conversion-rate initialization during probe.
> 
> 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.
> 
>   Documentation/hwmon/lm75.rst |  6 ++++++
>   drivers/hwmon/lm75.c         | 18 ++++++++++++++++++
>   2 files changed, 24 insertions(+)
> 
> 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..6b482f688c9f 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 = 0xc080,	/* no one-shot mode, clear conversion rate */
> +		.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