[PATCH 1/3] Documentation: hwmon: (nct6775) Document NCT6116D/NCT6122D/NCT6126D support

[PATCH 1/3] Documentation: hwmon: (nct6775) Document NCT6116D/NCT6122D/NCT6126D support

[Paul Louvel]

The NCT6112D/NCT6114D/NCT6116D family has been supported by the driver
since commit 29c7cb485b32 ("hwmon: (nct6775) Integrate new model
nct6116"), but was never added to the list of supported chips in the
driver documentation.

Also add the NCT6122D/NCT6126D.

Assisted-by: opencode:z-ai/glm-5.3-flash
Signed-off-by: Paul Louvel <paul.louvel@bootlin.com>
---
 Documentation/hwmon/nct6775.rst | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Documentation/hwmon/nct6775.rst b/Documentation/hwmon/nct6775.rst
index 41b21bed7e27..5199c083b9e7 100644
--- a/Documentation/hwmon/nct6775.rst
+++ b/Documentation/hwmon/nct6775.rst
@@ -16,6 +16,22 @@ Supported chips:
 
     Datasheet: Available from the Nuvoton web site
 
+  * Nuvoton NCT6112D/NCT6114D/NCT6116D
+
+    Prefix: 'nct6116'
+
+    Addresses scanned: ISA address retrieved from Super I/O registers
+
+    Datasheet: Available from the Nuvoton web site
+
+  * Nuvoton NCT6122D/NCT6126D
+
+    Prefix: 'nct6126'
+
+    Addresses scanned: ISA address retrieved from Super I/O registers
+
+    Datasheet: Available from the Nuvoton web site
+
   * Nuvoton NCT5572D/NCT6771F/NCT6772F/NCT6775F/W83677HG-I
 
     Prefix: 'nct6775'

-- 
2.55.0

[PATCH 2/3] hwmon: (nct6775) Add support for NCT6126D

[Paul Louvel]

Add support for the hardware monitoring functionality of the NCT6126D
Super-I/O chip.

The NCT6126D hardware monitor is nearly identical to the NCT6116D: the
fan, PWM, temperature, TSI, alarm.

The differences are:

- Device IDs 0xd283 (A version) and 0xd284 (B version), which both fall
  into the NCT6116D ID range (0xd280) when masked with SIO_ID_MASK.
  Instead, compare the full value to distinguish from NCT6116D.

- One additional VIN: VHIF scaled at 16 mV/LSB.

- The fan count limit registers are documented for all five fans.
  Also expose fan4_min.

Assisted-by: opencode:z-ai/glm-5.3-flash
Signed-Off: Paul Louvel <paul.louvel@bootlin.com>
---
 drivers/hwmon/nct6775-core.c     | 116 +++++++++++++++++++++++++++++++++++++++
 drivers/hwmon/nct6775-platform.c |  29 +++++++++-
 drivers/hwmon/nct6775.h          |   4 +-
 3 files changed, 146 insertions(+), 3 deletions(-)

diff --git a/drivers/hwmon/nct6775-core.c b/drivers/hwmon/nct6775-core.c
index 759ea3d1286e..cf27b9c7a89e 100644
--- a/drivers/hwmon/nct6775-core.c
+++ b/drivers/hwmon/nct6775-core.c
@@ -21,6 +21,8 @@
  * Chip        #vin    #fan    #pwm    #temp  chip IDs       man ID
  * nct6106d     9      3       3       6+3    0xc450 0xc1    0x5ca3
  * nct6116d     9      5       5       3+3    0xd280 0xc1    0x5ca3
+ * nct6126d    10      5       5       3+3    0xd283 0xc1    0x5ca3
+ *                                           (0xd284)
  * nct6775f     9      4       3       6+3    0xb470 0xc1    0x5ca3
  * nct6776f     9      5       3       6+3    0xc330 0xc1    0x5ca3
  * nct6779d    15      5       5       2+6    0xc560 0xc1    0x5ca3
@@ -66,6 +68,7 @@
 static const char * const nct6775_device_names[] = {
 	[nct6106] = "nct6106",
 	[nct6116] = "nct6116",
+	[nct6126] = "nct6126",
 	[nct6775] = "nct6775",
 	[nct6776] = "nct6776",
 	[nct6779] = "nct6779",
@@ -897,6 +900,31 @@ static const s8 NCT6116_BEEP_BITS[NUM_BEEP_BITS] = {
 
 static const u16 NCT6116_REG_TSI_TEMP[] = { 0x59, 0x5b };
 
+/* NCT6122D/NCT6126D specific data */
+
+static const u16 NCT6126_REG_IN[] = {
+	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09 };
+static const u16 NCT6126_REG_IN_MAX[] = {
+	0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e, 0xa0, 0xa2 };
+static const u16 NCT6126_REG_IN_MIN[] = {
+	0x91, 0x93, 0x95, 0x97, 0x99, 0x9b, 0x9d, 0x9f, 0xa1, 0xa3 };
+
+static const s8 NCT6126_ALARM_BITS[NUM_ALARM_BITS] = {
+	 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, -1, -1,	  /* in0-in11     */
+	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,	  /* in12-in23    */
+	32, 33, 34, 35, 36, -1, -1, -1, -1, -1, -1, -1,	  /* fan1-fan12   */
+	16, 17, 18, -1, -1, -1, -1, -1, -1, -1, -1, -1,	  /* temp1-temp12 */
+	48, -1,						  /* intr0-intr1  */
+};
+
+static const s8 NCT6126_BEEP_BITS[NUM_BEEP_BITS] = {
+	 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,	  /* in0-in11     */
+	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,	  /* in12-in23    */
+	24, 25, 26, 27, 28, -1, -1, -1, -1, -1, -1, -1,	  /* fan1-fan12   */
+	16, 17, 18, -1, -1, -1, -1, -1, -1, -1, -1, -1,	  /* temp1-temp12 */
+	34, -1, 32					  /* intr0-intr1, beep_en */
+};
+
 static enum pwm_enable reg_to_pwm_enable(int pwm, int mode)
 {
 	if (mode == 0 && pwm == 255)
@@ -998,6 +1026,14 @@ static const u16 scale_in_6798[NUM_IN] = {
 	800, 800,  800, 1600, 800
 };
 
+/*
+ * NCT6126 scaling:
+ * CPUVCORE, VIN0, AVSB, 3VCC, VIN1, VIN2, VHIF, 3VSB, VBAT,  VTT
+ */
+static const u16 scale_in_6126[10] = {
+	800, 800, 1600, 1600, 800, 800, 1600, 1600, 1600, 800
+};
+
 static inline long in_from_reg(u8 reg, u8 nr, const u16 *scales)
 {
 	return DIV_ROUND_CLOSEST(reg * scales[nr], 100);
@@ -1156,6 +1192,7 @@ bool nct6775_reg_is_word_sized(struct nct6775_data *data, u16 reg)
 		  reg == 0xe0 || reg == 0xe2 || reg == 0xe4 ||
 		  reg == 0x111 || reg == 0x121 || reg == 0x131;
 	case nct6116:
+	case nct6126:
 		return reg == 0x20 || reg == 0x22 || reg == 0x24 ||
 		  reg == 0x26 || reg == 0x28 || reg == 0x59 || reg == 0x5b ||
 		  reg == 0xe0 || reg == 0xe2 || reg == 0xe4 || reg == 0xe6 ||
@@ -1538,6 +1575,7 @@ static int nct6775_update_pwm_limits(struct device *dev)
 			break;
 		case nct6106:
 		case nct6116:
+		case nct6126:
 		case nct6779:
 		case nct6791:
 		case nct6792:
@@ -3203,6 +3241,7 @@ store_auto_pwm(struct device *dev, struct device_attribute *attr,
 			break; /* always enabled, nothing to do */
 		case nct6106:
 		case nct6116:
+		case nct6126:
 		case nct6779:
 		case nct6791:
 		case nct6792:
@@ -3677,6 +3716,83 @@ int nct6775_probe(struct device *dev, struct nct6775_data *data,
 		reg_temp_crit_l = NCT6106_REG_TEMP_CRIT_L;
 		reg_temp_crit_h = NCT6106_REG_TEMP_CRIT_H;
 
+		break;
+	case nct6126:
+		data->in_num = 10;
+		data->scale_in = scale_in_6126;
+		data->pwm_num = 5;
+		data->auto_pwm_num = 4;
+		data->temp_fixed_num = 3;
+		data->num_temp_alarms = 3;
+		data->num_temp_beeps = 3;
+
+		data->fan_from_reg = fan_from_reg13;
+		data->fan_from_reg_min = fan_from_reg13;
+
+		data->temp_label = nct6776_temp_label;
+		data->temp_mask = NCT6776_TEMP_MASK;
+		data->virt_temp_mask = NCT6776_VIRT_TEMP_MASK;
+
+		data->REG_VBAT = NCT6106_REG_VBAT;
+		data->REG_DIODE = NCT6106_REG_DIODE;
+		data->DIODE_MASK = NCT6106_DIODE_MASK;
+		data->REG_VIN = NCT6126_REG_IN;
+		data->REG_IN_MINMAX[0] = NCT6126_REG_IN_MIN;
+		data->REG_IN_MINMAX[1] = NCT6126_REG_IN_MAX;
+		data->REG_TARGET = NCT6116_REG_TARGET;
+		data->REG_FAN = NCT6116_REG_FAN;
+		data->REG_FAN_MODE = NCT6116_REG_FAN_MODE;
+		data->REG_FAN_MIN = NCT6116_REG_FAN_MIN;
+		data->REG_FAN_PULSES = NCT6116_REG_FAN_PULSES;
+		data->FAN_PULSE_SHIFT = NCT6116_FAN_PULSE_SHIFT;
+		data->REG_FAN_TIME[0] = NCT6116_REG_FAN_STOP_TIME;
+		data->REG_FAN_TIME[1] = NCT6116_REG_FAN_STEP_UP_TIME;
+		data->REG_FAN_TIME[2] = NCT6116_REG_FAN_STEP_DOWN_TIME;
+		data->REG_TOLERANCE_H = NCT6116_REG_TOLERANCE_H;
+		data->REG_PWM[0] = NCT6116_REG_PWM;
+		data->REG_PWM[1] = NCT6116_REG_FAN_START_OUTPUT;
+		data->REG_PWM[2] = NCT6116_REG_FAN_STOP_OUTPUT;
+		data->REG_PWM[5] = NCT6106_REG_WEIGHT_DUTY_STEP;
+		data->REG_PWM[6] = NCT6106_REG_WEIGHT_DUTY_BASE;
+		data->REG_PWM_READ = NCT6106_REG_PWM_READ;
+		data->REG_PWM_MODE = NCT6106_REG_PWM_MODE;
+		data->PWM_MODE_MASK = NCT6106_PWM_MODE_MASK;
+		data->REG_AUTO_TEMP = NCT6116_REG_AUTO_TEMP;
+		data->REG_AUTO_PWM = NCT6116_REG_AUTO_PWM;
+		data->REG_CRITICAL_TEMP = NCT6116_REG_CRITICAL_TEMP;
+		data->REG_CRITICAL_TEMP_TOLERANCE =
+			NCT6116_REG_CRITICAL_TEMP_TOLERANCE;
+		data->REG_CRITICAL_PWM_ENABLE = NCT6116_REG_CRITICAL_PWM_ENABLE;
+		data->CRITICAL_PWM_ENABLE_MASK =
+			NCT6106_CRITICAL_PWM_ENABLE_MASK;
+		data->REG_CRITICAL_PWM = NCT6116_REG_CRITICAL_PWM;
+		data->REG_TEMP_OFFSET = NCT6106_REG_TEMP_OFFSET;
+		data->REG_TEMP_SOURCE = NCT6106_REG_TEMP_SOURCE;
+		data->REG_TEMP_SEL = NCT6116_REG_TEMP_SEL;
+		data->REG_WEIGHT_TEMP_SEL = NCT6106_REG_WEIGHT_TEMP_SEL;
+		data->REG_WEIGHT_TEMP[0] = NCT6106_REG_WEIGHT_TEMP_STEP;
+		data->REG_WEIGHT_TEMP[1] = NCT6106_REG_WEIGHT_TEMP_STEP_TOL;
+		data->REG_WEIGHT_TEMP[2] = NCT6106_REG_WEIGHT_TEMP_BASE;
+		data->REG_ALARM = NCT6106_REG_ALARM;
+		data->ALARM_BITS = NCT6126_ALARM_BITS;
+		data->REG_BEEP = NCT6106_REG_BEEP;
+		data->BEEP_BITS = NCT6126_BEEP_BITS;
+		data->REG_TSI_TEMP = NCT6116_REG_TSI_TEMP;
+
+		reg_temp = NCT6106_REG_TEMP;
+		reg_temp_mon = NCT6106_REG_TEMP_MON;
+		num_reg_temp = 3;
+		num_reg_temp_mon = ARRAY_SIZE(NCT6106_REG_TEMP_MON);
+		num_reg_tsi_temp = ARRAY_SIZE(NCT6116_REG_TSI_TEMP);
+		reg_temp_over = NCT6106_REG_TEMP_OVER;
+		reg_temp_hyst = NCT6106_REG_TEMP_HYST;
+		reg_temp_config = NCT6106_REG_TEMP_CONFIG;
+		num_reg_temp_config = 3;
+		reg_temp_alternate = NCT6106_REG_TEMP_ALTERNATE;
+		reg_temp_crit = NCT6106_REG_TEMP_CRIT;
+		reg_temp_crit_l = NCT6106_REG_TEMP_CRIT_L;
+		reg_temp_crit_h = NCT6106_REG_TEMP_CRIT_H;
+
 		break;
 	case nct6775:
 		data->in_num = 9;
diff --git a/drivers/hwmon/nct6775-platform.c b/drivers/hwmon/nct6775-platform.c
index d394376e4306..a8ef58d3a883 100644
--- a/drivers/hwmon/nct6775-platform.c
+++ b/drivers/hwmon/nct6775-platform.c
@@ -25,6 +25,7 @@ enum sensor_access { access_direct, access_asuswmi };
 static const char * const nct6775_sio_names[] __initconst = {
 	[nct6106] = "NCT6106D",
 	[nct6116] = "NCT6116D",
+	[nct6126] = "NCT6126D",
 	[nct6775] = "NCT6775F",
 	[nct6776] = "NCT6776D/F",
 	[nct6779] = "NCT6779D",
@@ -76,6 +77,8 @@ MODULE_PARM_DESC(fan_debounce, "Enable debouncing for fan RPM signal");
 
 #define SIO_NCT6106_ID		0xc450
 #define SIO_NCT6116_ID		0xd280
+#define SIO_NCT6126_A_ID	0xd283
+#define SIO_NCT6126_B_ID	0xd284
 #define SIO_NCT6775_ID		0xb470
 #define SIO_NCT6776_ID		0xc330
 #define SIO_NCT6779_ID		0xc560
@@ -565,6 +568,25 @@ nct6775_check_fan_inputs(struct nct6775_data *data, struct nct6775_sio_data *sio
 		pwm3pin = fan3pin && (cr24 & 0x08);
 		pwm4pin = fan4pin;
 		pwm5pin = fan5pin;
+	} else if (data->kind == nct6126) {
+		int cr1a = sio_data->sio_inb(sio_data, 0x1a);
+		int cr1b = sio_data->sio_inb(sio_data, 0x1b);
+		int cr24 = sio_data->sio_inb(sio_data, 0x24);
+		int cr2a = sio_data->sio_inb(sio_data, 0x2a);
+		int cr2b = sio_data->sio_inb(sio_data, 0x2b);
+		int cr2f = sio_data->sio_inb(sio_data, 0x2f);
+
+		fan3pin = !(cr2b & 0x10);
+		fan4pin = (cr2b & 0x80) ||			/* pin 1(2) */
+			(!(cr2f & 0x10) && (cr1a & 0x04));	/* pin 65(66) */
+		fan5pin = (cr2b & 0x80) ||			/* pin 126(127) */
+			(!(cr1b & 0x03) && (cr2a & 0x02));	/* pin 94(96) */
+
+		pwm3pin = fan3pin && (cr24 & 0x08);
+		pwm4pin = fan4pin;
+		pwm5pin = fan5pin;
+
+		fan4min = fan4pin;
 	} else {
 		/*
 		 * NCT6779D, NCT6791D, NCT6792D, NCT6793D, NCT6795D, NCT6796D,
@@ -861,6 +883,7 @@ static int nct6775_platform_probe_init(struct nct6775_data *data)
 		break;
 	case nct6106:
 	case nct6116:
+	case nct6126:
 	case nct6779:
 	case nct6791:
 	case nct6792:
@@ -892,6 +915,7 @@ static int nct6775_platform_probe_init(struct nct6775_data *data)
 		switch (data->kind) {
 		case nct6106:
 		case nct6116:
+		case nct6126:
 			tmp |= 0xe0;
 			break;
 		case nct6775:
@@ -1006,7 +1030,10 @@ static int __init nct6775_find(int sioaddr, struct nct6775_sio_data *sio_data)
 		sio_data->kind = nct6106;
 		break;
 	case SIO_NCT6116_ID:
-		sio_data->kind = nct6116;
+		if (val == SIO_NCT6126_A_ID || val == SIO_NCT6126_B_ID)
+			sio_data->kind = nct6126;
+		else
+			sio_data->kind = nct6116;
 		break;
 	case SIO_NCT6775_ID:
 		sio_data->kind = nct6775;
diff --git a/drivers/hwmon/nct6775.h b/drivers/hwmon/nct6775.h
index 296eff99d003..d18ac91be497 100644
--- a/drivers/hwmon/nct6775.h
+++ b/drivers/hwmon/nct6775.h
@@ -4,8 +4,8 @@
 
 #include <linux/types.h>
 
-enum kinds { nct6106, nct6116, nct6775, nct6776, nct6779, nct6791, nct6792,
-	     nct6793, nct6795, nct6796, nct6797, nct6798, nct6799 };
+enum kinds { nct6106, nct6116, nct6126, nct6775, nct6776, nct6779, nct6791,
+	     nct6792, nct6793, nct6795, nct6796, nct6797, nct6798, nct6799 };
 enum pwm_enable { off, manual, thermal_cruise, speed_cruise, sf3, sf4 };
 
 #define NUM_TEMP	12	/* Max number of temp attribute sets w/ limits*/

-- 
2.55.0

[PATCH 3/3] hwmon: (nct6775) Add support for NCT6122D

[Paul Louvel]

The NCT6122D hardware monitor is the same as the NCT6126D, the only
difference if the number of UARTs: two instead of six.
Add it to the driver using the nct6126 chip kind to avoid code
duplication.

Assisted-by: opencode:z-ai/glm-5.3-flash
Signed-off-by: Paul Louvel <paul.louvel@bootlin.com>
---
 drivers/hwmon/nct6775-platform.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/nct6775-platform.c b/drivers/hwmon/nct6775-platform.c
index a8ef58d3a883..d359c28f3e0f 100644
--- a/drivers/hwmon/nct6775-platform.c
+++ b/drivers/hwmon/nct6775-platform.c
@@ -25,7 +25,7 @@ enum sensor_access { access_direct, access_asuswmi };
 static const char * const nct6775_sio_names[] __initconst = {
 	[nct6106] = "NCT6106D",
 	[nct6116] = "NCT6116D",
-	[nct6126] = "NCT6126D",
+	[nct6126] = "NCT6122D/NCT6126D",
 	[nct6775] = "NCT6775F",
 	[nct6776] = "NCT6776D/F",
 	[nct6779] = "NCT6779D",
@@ -77,6 +77,7 @@ MODULE_PARM_DESC(fan_debounce, "Enable debouncing for fan RPM signal");
 
 #define SIO_NCT6106_ID		0xc450
 #define SIO_NCT6116_ID		0xd280
+#define SIO_NCT6122_ID		0xd2a0
 #define SIO_NCT6126_A_ID	0xd283
 #define SIO_NCT6126_B_ID	0xd284
 #define SIO_NCT6775_ID		0xb470
@@ -1035,6 +1036,9 @@ static int __init nct6775_find(int sioaddr, struct nct6775_sio_data *sio_data)
 		else
 			sio_data->kind = nct6116;
 		break;
+	case SIO_NCT6122_ID:
+		sio_data->kind = nct6126;
+		break;
 	case SIO_NCT6775_ID:
 		sio_data->kind = nct6775;
 		break;

-- 
2.55.0

Re: [PATCH 1/3] Documentation: hwmon: (nct6775) Document NCT6116D/NCT6122D/NCT6126D support

[Guenter Roeck]

On Wed, Sep 09, 2026 at 08:25:54PM +0200, Paul Louvel wrote:
> The NCT6112D/NCT6114D/NCT6116D family has been supported by the driver
> since commit 29c7cb485b32 ("hwmon: (nct6775) Integrate new model
> nct6116"), but was never added to the list of supported chips in the
> driver documentation.
> 
> Also add the NCT6122D/NCT6126D.
> 
> Assisted-by: opencode:z-ai/glm-5.3-flash
> Signed-off-by: Paul Louvel <paul.louvel@bootlin.com>

Applied.

Thanks,
Guenter

Re: [PATCH 2/3] hwmon: (nct6775) Add support for NCT6126D

[Guenter Roeck]

On Wed, Sep 09, 2026 at 08:25:55PM +0200, Paul Louvel wrote:
> Add support for the hardware monitoring functionality of the NCT6126D
> Super-I/O chip.
> 
> The NCT6126D hardware monitor is nearly identical to the NCT6116D: the
> fan, PWM, temperature, TSI, alarm.
> 
> The differences are:
> 
> - Device IDs 0xd283 (A version) and 0xd284 (B version), which both fall
>   into the NCT6116D ID range (0xd280) when masked with SIO_ID_MASK.
>   Instead, compare the full value to distinguish from NCT6116D.
> 
> - One additional VIN: VHIF scaled at 16 mV/LSB.
> 
> - The fan count limit registers are documented for all five fans.
>   Also expose fan4_min.
> 
> Assisted-by: opencode:z-ai/glm-5.3-flash
> Signed-Off: Paul Louvel <paul.louvel@bootlin.com>

Signed-off-by:

I can not change that, so you'll have to resend.

Thanks,
Guenter

Re: [PATCH 2/3] hwmon: (nct6775) Add support for NCT6126D

[Paul Louvel]

On Wed Sep 9, 2026 at 10:28 PM CEST, Guenter Roeck wrote:
> On Wed, Sep 09, 2026 at 08:25:55PM +0200, Paul Louvel wrote:
>> Add support for the hardware monitoring functionality of the NCT6126D
>> Super-I/O chip.
>> 
>> The NCT6126D hardware monitor is nearly identical to the NCT6116D: the
>> fan, PWM, temperature, TSI, alarm.
>> 
>> The differences are:
>> 
>> - Device IDs 0xd283 (A version) and 0xd284 (B version), which both fall
>>   into the NCT6116D ID range (0xd280) when masked with SIO_ID_MASK.
>>   Instead, compare the full value to distinguish from NCT6116D.
>> 
>> - One additional VIN: VHIF scaled at 16 mV/LSB.
>> 
>> - The fan count limit registers are documented for all five fans.
>>   Also expose fan4_min.
>> 
>> Assisted-by: opencode:z-ai/glm-5.3-flash
>> Signed-Off: Paul Louvel <paul.louvel@bootlin.com>
>
> Signed-off-by:
>
> I can not change that, so you'll have to resend.
>
> Thanks,
> Guenter

Whoops, sorry.
I guess manually adding this trailer is not a very good idea..

Thanks,
-- 
Paul Louvel, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

Re: [PATCH 3/3] hwmon: (nct6775) Add support for NCT6122D

[Guenter Roeck]

On Wed, Sep 09, 2026 at 08:25:56PM +0200, Paul Louvel wrote:
> The NCT6122D hardware monitor is the same as the NCT6126D, the only
> difference if the number of UARTs: two instead of six.
> Add it to the driver using the nct6126 chip kind to avoid code
> duplication.
> 
> Assisted-by: opencode:z-ai/glm-5.3-flash
> Signed-off-by: Paul Louvel <paul.louvel@bootlin.com>

Applied.

Thanks,
Guenter