iio: adc: add Nuvoton NCT7201 ADC driver

Add a binding specification for the Nuvoton NCT7201/NCT7202 up to 12-bit ADCs with I2C interface.

Signed-off-by Eason Yang <[email protected]>

---
 .../bindings/iio/adc/nuvoton,nct7201.yaml     | 57 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 58 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml

Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml new file +22 -0

new file mode 100644
index 000000000000..830c37fd9f22
@@ -0,0 +1,57 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/nuvoton,nct7201.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Nuvoton nct7201 and similar ADCs
+
+maintainers:
+  - Eason Yang <[email protected]>
+
+description: |
+  The NCT7201/NCT7202 is a Nuvoton Hardware Monitor IC, contains up to 12 voltage
+  monitoring channels, with SMBus interface, and up to 4 sets SMBus address
+  selection by ADDR connection. It also provides ALERT# signal for event
+  notification and reset input RSTIN# to recover it from a fault condition.
+
+properties:
+  compatible:
+    enum:
+      - nuvoton,nct7201
+      - nuvoton,nct7202

Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml new file +25 -0

+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@1d {
+            compatible = "nuvoton,nct7202";
+            reg = <0x1d>;
+            interrupt-parent = <&gpio3>;
+            interrupts = <30 IRQ_TYPE_LEVEL_LOW>;
+            reset-gpios = <&gpio3 28 GPIO_ACTIVE_LOW>;
+        };
+    };
+...

MAINTAINERS +0 -0

index 3864d473f52f..fdc4aa5c7eff 100644

MAINTAINERS +0 -0

 F:	Documentation/devicetree/bindings/rtc/nuvoton,nct3018y.yaml
 F:	arch/arm/boot/dts/nuvoton/nuvoton-npcm*
 F:	arch/arm/mach-npcm/

Quoted 42 lines

Add a binding specification for the Nuvoton NCT7201/NCT7202 up to 12-bit ADCs with I2C interface.

Signed-off-by Eason Yang <[email protected]>

---
 .../bindings/iio/adc/nuvoton,nct7201.yaml     | 57 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 58 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml

Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml new file +26 -0

new file mode 100644
index 000000000000..830c37fd9f22
@@ -0,0 +1,57 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/nuvoton,nct7201.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Nuvoton nct7201 and similar ADCs
+
+maintainers:
+  - Eason Yang <[email protected]>
+
+description: |
+  The NCT7201/NCT7202 is a Nuvoton Hardware Monitor IC, contains up to 12 voltage
+  monitoring channels, with SMBus interface, and up to 4 sets SMBus address
+  selection by ADDR connection. It also provides ALERT# signal for event
+  notification and reset input RSTIN# to recover it from a fault condition.
+
+properties:
+  compatible:
+    enum:
+      - nuvoton,nct7201
+      - nuvoton,nct7202
+
+  reg:
+    maxItems: 1
+

Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml line 32

Quoted 6 lines

Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml new file +6 -0

+  interrupts:
+    maxItems: 1
+
+  reset-gpios:
+    maxItems: 1
+

Maybe this was brought up before, but no power supply?

Quoted 11 lines

Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml new file +11 -0

+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>

Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml line 51

Quoted 8 lines

Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml new file +8 -0

+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@1d {
+            compatible = "nuvoton,nct7202";
+            reg = <0x1d>;

Quoted 7 lines

Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml new file +6 -0

+            interrupt-parent = <&gpio3>;
+            interrupts = <30 IRQ_TYPE_LEVEL_LOW>;
+            reset-gpios = <&gpio3 28 GPIO_ACTIVE_LOW>;
+        };
+    };
+...

MAINTAINERS +0 -0

MAINTAINERS L: [email protected] (moderated for non-subscribers) · line 2834

Quoted 8 lines

index 3864d473f52f..fdc4aa5c7eff 100644

MAINTAINERS +1 -0

@@ -2831,6 +2831,7 @@ L:      [email protected] (moderated for non-subscribers)
 S:   Supported
 F:   Documentation/devicetree/bindings/*/*/*npcm*
 F:   Documentation/devicetree/bindings/*/*npcm*
+F:   Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml

This (ARM/NUVOTON NPCM ARCHITECTURE) doesn't look like the right place for adding a stand-alone chip. You will need to start a new section like:

NUVOTON NCT7201 IIO DRIVER

Quoted 3 lines

MAINTAINERS +0 -0

 F:   Documentation/devicetree/bindings/rtc/nuvoton,nct3018y.yaml
 F:   arch/arm/boot/dts/nuvoton/nuvoton-npcm*
 F:   arch/arm/mach-npcm/

Add a binding specification for the Nuvoton NCT7201/NCT7202 up to 12-bit ADCs with I2C interface.

Signed-off-by Eason Yang <[email protected]>

---
 .../bindings/iio/adc/nuvoton,nct7201.yaml     | 57 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 58 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml

Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml new file +12 -0

new file mode 100644
index 000000000000..830c37fd9f22
@@ -0,0 +1,57 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/nuvoton,nct7201.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Nuvoton nct7201 and similar ADCs
+
+maintainers:
+  - Eason Yang <[email protected]>
+
+description: |

Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml new file +35 -0

+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  reset-gpios:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@1d {
+            compatible = "nuvoton,nct7202";
+            reg = <0x1d>;
+            interrupt-parent = <&gpio3>;
+            interrupts = <30 IRQ_TYPE_LEVEL_LOW>;
+            reset-gpios = <&gpio3 28 GPIO_ACTIVE_LOW>;
+        };
+    };
+...

MAINTAINERS +1 -0

index 3864d473f52f..fdc4aa5c7eff 100644
@@ -2831,6 +2831,7 @@ L:	[email protected] (moderated for non-subscribers)
 S:	Supported
 F:	Documentation/devicetree/bindings/*/*/*npcm*
 F:	Documentation/devicetree/bindings/*/*npcm*
+F:	Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml
 F:	Documentation/devicetree/bindings/rtc/nuvoton,nct3018y.yaml
 F:	arch/arm/boot/dts/nuvoton/nuvoton-npcm*
 F:	arch/arm/mach-npcm/

Signature · 1 line

2.34.1

Add Nuvoton NCT7201/NCT7202 system voltage monitor 12-bit ADC driver

NCT7201/NCT7202 supports up to 12 analog voltage monitor inputs and up to 4 SMBus addresses by ADDR pin. Meanwhile, ALERT# hardware event pins for independent alarm signals, and the all threshold values could be set for system protection without any timing delay. It also supports reset input RSTIN# to recover system from a fault condition.

Currently, only single-edge mode conversion and threshold events support.

Signed-off-by Eason Yang <[email protected]>

---
 MAINTAINERS               |   1 +
 drivers/iio/adc/Kconfig   |  11 +
 drivers/iio/adc/Makefile  |   1 +
 drivers/iio/adc/nct7201.c | 487 ++++++++++++++++++++++++++++++++++++++
 4 files changed, 500 insertions(+)
 create mode 100644 drivers/iio/adc/nct7201.c

MAINTAINERS +0 -0

index fdc4aa5c7eff..389cbbdae1a7 100644

MAINTAINERS +0 -0

 F:	drivers/rtc/rtc-nct3018y.c
 F:	include/dt-bindings/clock/nuvoton,npcm7xx-clock.h
 F:	include/dt-bindings/clock/nuvoton,npcm845-clk.h

drivers/iio/adc/nct7201.c new file +5 -0

new file mode 100644
index 000000000000..c5d1540bcc00
@@ -0,0 +1,487 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Driver for Nuvoton nct7201 and nct7202 power monitor chips.
+ *
+ * Copyright (c) 2024-2025 Nuvoton Technology corporation.

drivers/iio/adc/nct7201.c new file +10 -0

+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/regmap.h>
+#include <linux/types.h>
+#include <linux/unaligned.h>
+
+#include <linux/iio/events.h>
+#include <linux/iio/iio.h>
+

drivers/iio/adc/nct7201.c new file +32 -0

+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		err = regmap_read(chip->regmap16, NCT7201_REG_VIN(chan->address), &value);
+		if (err < 0)
+			return err;
+		volt = value;
+		*val = FIELD_GET(NCT7201_REG_VIN_MASK, volt);
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		/* From the datasheet, we have to multiply by 0.0004995 */
+		*val = 0;
+		*val2 = 499500;
+		return IIO_VAL_INT_PLUS_NANO;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int nct7201_read_event_value(struct iio_dev *indio_dev,
+				    const struct iio_chan_spec *chan,
+				    enum iio_event_type type,
+				    enum iio_event_direction dir,
+				    enum iio_event_info info,
+				    int *val, int *val2)
+{
+	struct nct7201_chip_info *chip = iio_priv(indio_dev);
+	u16 volt;
+	unsigned int value;
+	int err;
+
+	if (chan->type != IIO_VOLTAGE)
+		return -EOPNOTSUPP;

drivers/iio/adc/nct7201.c new file +21 -0

+	} else {
+		err = regmap_read(chip->regmap16, NCT7201_REG_VIN_HIGH_LIMIT(chan->address),
+				  &value);
+		if (err < 0)
+			return err;
+		volt = value;
+	}
+
+	*val = FIELD_GET(NCT7201_REG_VIN_MASK, volt);
+
+	return IIO_VAL_INT;
+}
+
+static int nct7201_write_event_value(struct iio_dev *indio_dev,
+				     const struct iio_chan_spec *chan,
+				     enum iio_event_type type,
+				     enum iio_event_direction dir,
+				     enum iio_event_info info,
+				     int val, int val2)
+{
+	struct nct7201_chip_info *chip = iio_priv(indio_dev);

drivers/iio/adc/nct7201.c new file +7 -0

+	else
+		regmap_write(chip->regmap16, NCT7201_REG_VIN_HIGH_LIMIT(chan->address),
+			     FIELD_PREP(NCT7201_REG_VIN_MASK, val));
+
+	return 0;
+}
+

drivers/iio/adc/nct7201.c new file +8 -0

+static int nct7201_write_event_config(struct iio_dev *indio_dev,
+				      const struct iio_chan_spec *chan,
+				      enum iio_event_type type,
+				      enum iio_event_direction dir,
+				      bool state)
+{
+	struct nct7201_chip_info *chip = iio_priv(indio_dev);
+	unsigned int mask;

drivers/iio/adc/nct7201.c new file +7 -0

+	else
+		regmap_bulk_write(chip->regmap, NCT7201_REG_CHANNEL_ENABLE_1,
+				  &chip->vin_mask, sizeof(chip->vin_mask));
+
+	return 0;
+}
+

drivers/iio/adc/nct7201.c new file +21 -0

+
+	/*
+	 * After about 25 msecs, the device should be ready and then
+	 * the Power Up bit will be set to 1. If not, wait for it.
+	 */
+	mdelay(25);
+	err = regmap_read(chip->regmap, NCT7201_REG_BUSY_STATUS, &value);
+	if (err < 0)
+		return err;
+	if (!(value & NCT7201_BIT_PWR_UP))
+		return dev_err_probe(&chip->client->dev, -EIO,
+				     "Failed to power up after reset\n");
+
+	/* Enable Channel */
+	if (chip->num_vin_channels <= 8) {
+		data[0] = NCT7201_REG_CHANNEL_ENABLE_1_MASK;
+		err = regmap_write(chip->regmap, NCT7201_REG_CHANNEL_ENABLE_1, data[0]);
+		if (err < 0)
+			return dev_err_probe(&chip->client->dev, -EIO,
+					     "Failed to write NCT7201_REG_CHANNEL_ENABLE_1\n");
+	} else {

drivers/iio/adc/nct7201.c new file +12 -0

+
+	/* Start monitoring if needed */
+	err = regmap_read(chip->regmap, NCT7201_REG_CONFIGURATION, &value);
+	if (err < 0)
+		return dev_err_probe(&chip->client->dev, -EIO,
+				     "Failed to read NCT7201_REG_CONFIGURATION\n");
+
+	regmap_set_bits(chip->regmap, NCT7201_REG_CONFIGURATION, NCT7201_BIT_CONFIGURATION_START);
+
+	return 0;
+}
+

Add Nuvoton NCT7201/NCT7202 system voltage monitor 12-bit ADC driver

NCT7201/NCT7202 supports up to 12 analog voltage monitor inputs and up to 4 SMBus addresses by ADDR pin. Meanwhile, ALERT# hardware event pins for independent alarm signals, and the all threshold values could be set for system protection without any timing delay. It also supports reset input RSTIN# to recover system from a fault condition.

Currently, only single-edge mode conversion and threshold events support.

Signed-off-by Eason Yang <[email protected]>

drivers/iio/adc/nct7201.c new file +27 -0

new file mode 100644
index 000000000000..c5d1540bcc00
@@ -0,0 +1,487 @@
 
+
+#define NCT7201_VOLTAGE_CHANNEL(chan, addr)				\
+	{								\
+		.type = IIO_VOLTAGE,					\
+		.indexed = 1,						\
+		.channel = chan,					\
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
+		.address = addr,					\
+		.event_spec = nct7201_events,				\
+		.num_event_specs = ARRAY_SIZE(nct7201_events),		\
+	}
+
+static const struct iio_chan_spec nct7201_channels[] = {
+	NCT7201_VOLTAGE_CHANNEL(1, 0),
+	NCT7201_VOLTAGE_CHANNEL(2, 1),
+	NCT7201_VOLTAGE_CHANNEL(3, 2),
+	NCT7201_VOLTAGE_CHANNEL(4, 3),
+	NCT7201_VOLTAGE_CHANNEL(5, 4),
+	NCT7201_VOLTAGE_CHANNEL(6, 5),
+	NCT7201_VOLTAGE_CHANNEL(7, 6),
+	NCT7201_VOLTAGE_CHANNEL(8, 7),
+};
+
+static const struct iio_chan_spec nct7202_channels[] = {
+	NCT7201_VOLTAGE_CHANNEL(1, 0),
+	NCT7201_VOLTAGE_CHANNEL(2, 1),

drivers/iio/adc/nct7201.c new file +21 -0

+};
 
+static int nct7201_read_event_value(struct iio_dev *indio_dev,
+				    const struct iio_chan_spec *chan,
+				    enum iio_event_type type,
+				    enum iio_event_direction dir,
+				    enum iio_event_info info,
+				    int *val, int *val2)
+{
+	struct nct7201_chip_info *chip = iio_priv(indio_dev);
+	u16 volt;
+	unsigned int value;
+	int err;
+
+	if (chan->type != IIO_VOLTAGE)
+		return -EOPNOTSUPP;
+
+	if (info != IIO_EV_INFO_VALUE)
+		return -EINVAL;
+
+	if (dir == IIO_EV_DIR_FALLING) {
+		err = regmap_read(chip->regmap16, NCT7201_REG_VIN_LOW_LIMIT(chan->address),

drivers/iio/adc/nct7201.c new file +18 -0

+	}
+
+	*val = FIELD_GET(NCT7201_REG_VIN_MASK, volt);
+
+	return IIO_VAL_INT;
+}
+
+static int nct7201_write_event_value(struct iio_dev *indio_dev,
+				     const struct iio_chan_spec *chan,
+				     enum iio_event_type type,
+				     enum iio_event_direction dir,
+				     enum iio_event_info info,
+				     int val, int val2)
+{
+	struct nct7201_chip_info *chip = iio_priv(indio_dev);
+
+	if (chan->type != IIO_VOLTAGE)
+		return -EOPNOTSUPP;

drivers/iio/adc/nct7201.c new file +31 -0

+
+	return 0;
+}
+
+static int nct7201_read_event_config(struct iio_dev *indio_dev,
+				     const struct iio_chan_spec *chan,
+				     enum iio_event_type type,
+				     enum iio_event_direction dir)
+{
+	struct nct7201_chip_info *chip = iio_priv(indio_dev);
+
+	if (chan->type != IIO_VOLTAGE)
+		return -EOPNOTSUPP;
+
+	return !!(chip->vin_mask & BIT(chan->address));
+}
+
+static int nct7201_write_event_config(struct iio_dev *indio_dev,
+				      const struct iio_chan_spec *chan,
+				      enum iio_event_type type,
+				      enum iio_event_direction dir,
+				      bool state)
+{
+	struct nct7201_chip_info *chip = iio_priv(indio_dev);
+	unsigned int mask;
+
+	if (chan->type != IIO_VOLTAGE)
+		return -EOPNOTSUPP;
+
+	mask = BIT(chan->address);
+

drivers/iio/adc/nct7201.c new file +18 -0

+	 */
+	mdelay(25);
+	err = regmap_read(chip->regmap, NCT7201_REG_BUSY_STATUS, &value);
+	if (err < 0)
+		return err;
+	if (!(value & NCT7201_BIT_PWR_UP))
+		return dev_err_probe(&chip->client->dev, -EIO,
+				     "Failed to power up after reset\n");
+
+	/* Enable Channel */
+	if (chip->num_vin_channels <= 8) {
+		data[0] = NCT7201_REG_CHANNEL_ENABLE_1_MASK;
+		err = regmap_write(chip->regmap, NCT7201_REG_CHANNEL_ENABLE_1, data[0]);
+		if (err < 0)
+			return dev_err_probe(&chip->client->dev, -EIO,
+					     "Failed to write NCT7201_REG_CHANNEL_ENABLE_1\n");
+	} else {
+		data[0] = NCT7201_REG_CHANNEL_ENABLE_1_MASK;

drivers/iio/adc/nct7201.c new file +22 -0

+
+	/* Start monitoring if needed */
+	err = regmap_read(chip->regmap, NCT7201_REG_CONFIGURATION, &value);
+	if (err < 0)
+		return dev_err_probe(&chip->client->dev, -EIO,
+				     "Failed to read NCT7201_REG_CONFIGURATION\n");
+
+	regmap_set_bits(chip->regmap, NCT7201_REG_CONFIGURATION, NCT7201_BIT_CONFIGURATION_START);
+
+	return 0;
+}
+
+static int nct7201_probe(struct i2c_client *client)
+{
+	const struct nct7201_adc_model_data *model_data;
+	struct nct7201_chip_info *chip;
+	struct iio_dev *indio_dev;
+	int ret;
+
+	model_data = i2c_get_match_data(client);
+	if (!model_data)
+		return -EINVAL;

drivers/iio/adc/nct7201.c new file +29 -0

+
+	chip->regmap16 = devm_regmap_init_i2c(client, &nct7201_regmap16_config);
+	if (IS_ERR(chip->regmap16))
+		return dev_err_probe(&client->dev, PTR_ERR(chip->regmap16),
+			"Failed to init regmap16\n");
+
+	chip->num_vin_channels = model_data->num_vin_channels;
+
+	ret = devm_mutex_init(&client->dev, &chip->access_lock);
+	if (ret)
+		return ret;
+
+	chip->client = client;
+
+	ret = nct7201_init_chip(chip);
+	if (ret < 0)
+		return ret;
+
+	indio_dev->name = model_data->model_name;
+	indio_dev->channels = model_data->channels;
+	indio_dev->num_channels = model_data->num_channels;
+	if (client->irq)
+		indio_dev->info = &nct7201_info;
+	else
+		indio_dev->info = &nct7201_info_no_irq;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+
+	return devm_iio_device_register(&client->dev, indio_dev);
+}

Add Nuvoton NCT7201/NCT7202 system voltage monitor 12-bit ADC driver

NCT7201/NCT7202 supports up to 12 analog voltage monitor inputs and up to 4 SMBus addresses by ADDR pin. Meanwhile, ALERT# hardware event pins for independent alarm signals, and the all threshold values could be set for

system protection without any timing delay. It also supports reset input RSTIN# to recover system from a fault condition.

Currently, only single-edge mode conversion and threshold events support.

Signed-off-by Eason Yang <[email protected]>

---
  MAINTAINERS               |   1 +
  drivers/iio/adc/Kconfig   |  11 +
  drivers/iio/adc/Makefile  |   1 +
  drivers/iio/adc/nct7201.c | 487 ++++++++++++++++++++++++++++++++++++++
  4 files changed, 500 insertions(+)

create mode 100644 drivers/iio/adc/nct7201.c

Change since version 4:
- Fix comments
- Add interrupts and reset-gpios to the DT example
- Use the FIELD_PREP and FIELD_GET
- Add use_single_write in regmap_config
- Use regmap_access_table

Change since version 3:
- Fix comments
- Don't put nct720"x" in the name, just call it nct7201
- Remove differential inputs until conversions are finished
- Add NCT7201_ prefix in all macros and avoid the tables
- Correct event threshold values in raw units
- Add with and without interrupt callback function to have the event config part and one that doesn't
- Remove print an error message if regmap_wirte failed case

Change since version 2:
- Remvoe read-vin-data-size property, default use read word vin data
- Use regmap instead of i2c smbus API
- IIO should be IIO_CHAN_INFO_RAW and _SCALE not _PROCESSED
- Use dev_xxx_probe in probe function and dev_xxx in other functions
- Use devm_iio_device_register replace of iio_device_register
- Use guard(mutex) replace of mutex_lock
- Use get_unaligned_le16 conversion API

Changes since version 1:
- Add new property in iio:adc binding document
- Add new driver for Nuvoton NCT720x driver

Eason Yang (2):
dt-bindings: iio: adc: add NCT7201 ADCs
iio: adc: add support for Nuvoton NCT7201

 .../bindings/iio/adc/nuvoton,nct7201.yaml     |  57 ++
 MAINTAINERS                                   |   2 +
 drivers/iio/adc/Kconfig                       |  11 +
 drivers/iio/adc/Makefile                      |   1 +
 drivers/iio/adc/nct7201.c                     | 487 ++++++++++++++++++
 5 files changed, 558 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml
 create mode 100644 drivers/iio/adc/nct7201.c

On Fri, 21 Feb 2025 17:09:16 +0800
Eason Yang <[email protected]> wrote:

Hi Eason,

Not sure if I asked this before, but this is a device that seems to be typically used for hardware monitoring and there are a number of similar sounding device in drivers/hwmon/

That raises a couple of questions:
1) Is it compatible with any of those existing drivers?

2) Why IIO rather than HWMON?

There isn't normally a problem with having a hardware monitoring related device supported by IIO, it is just good to know if your usecase makes that a good idea. We have the iio-hwmon bridge driver to solve the problem of a device than can be used either as a generic ADC or as a hwmon type monitoring device (which tends to have more alarms etc)

Jonathan

Quoted 43 lines

Change since version 4:
- Fix comments
- Add interrupts and reset-gpios to the DT example
- Use the FIELD_PREP and FIELD_GET
- Add use_single_write in regmap_config
- Use regmap_access_table

Change since version 3:
- Fix comments
- Don't put nct720"x" in the name, just call it nct7201
- Remove differential inputs until conversions are finished
- Add NCT7201_ prefix in all macros and avoid the tables
- Correct event threshold values in raw units
- Add with and without interrupt callback function to have the event config part and one that doesn't
- Remove print an error message if regmap_wirte failed case

Change since version 2:
- Remvoe read-vin-data-size property, default use read word vin data
- Use regmap instead of i2c smbus API
- IIO should be IIO_CHAN_INFO_RAW and _SCALE not _PROCESSED
- Use dev_xxx_probe in probe function and dev_xxx in other functions
- Use devm_iio_device_register replace of iio_device_register
- Use guard(mutex) replace of mutex_lock
- Use get_unaligned_le16 conversion API

Changes since version 1:
- Add new property in iio:adc binding document
- Add new driver for Nuvoton NCT720x driver

Eason Yang (2):
dt-bindings: iio: adc: add NCT7201 ADCs
iio: adc: add support for Nuvoton NCT7201

 .../bindings/iio/adc/nuvoton,nct7201.yaml     |  57 ++
 MAINTAINERS                                   |   2 +
 drivers/iio/adc/Kconfig                       |  11 +
 drivers/iio/adc/Makefile                      |   1 +
 drivers/iio/adc/nct7201.c                     | 487 ++++++++++++++++++
 5 files changed, 558 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml
 create mode 100644 drivers/iio/adc/nct7201.c