diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 8a6c6ee28556..cf4c5e92738b 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -219,6 +219,15 @@ config I2C_CHT_WC
 	  combined with a FUSB302 Type-C port-controller as such it is advised
 	  to also select CONFIG_TYPEC_FUSB302=m.
 
+config I2C_NCT6775
+	tristate "Nuvoton NCT6775 and compatible SMBus controller"
+	help
+		If you say yes to this option, support will be included for the
+		Nuvoton NCT6775 and compatible SMBus controllers.
+
+		This driver can also be built as a module.  If so, the module
+		will be called i2c-nct6775.
+
 config I2C_NFORCE2
 	tristate "Nvidia nForce2, nForce3 and nForce4"
 	depends on PCI
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 1d00dce77098..450cde39c7d5 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_I2C_CHT_WC)	+= i2c-cht-wc.o
 obj-$(CONFIG_I2C_I801)		+= i2c-i801.o
 obj-$(CONFIG_I2C_ISCH)		+= i2c-isch.o
 obj-$(CONFIG_I2C_ISMT)		+= i2c-ismt.o
+obj-$(CONFIG_I2C_NCT6775)	+= i2c-nct6775.o
 obj-$(CONFIG_I2C_NFORCE2)	+= i2c-nforce2.o
 obj-$(CONFIG_I2C_NFORCE2_S4985)	+= i2c-nforce2-s4985.o
 obj-$(CONFIG_I2C_NVIDIA_GPU)	+= i2c-nvidia-gpu.o
diff --git a/drivers/i2c/busses/i2c-nct6775.c b/drivers/i2c/busses/i2c-nct6775.c
new file mode 100644
index 000000000000..fdffe30f595b
--- /dev/null
+++ b/drivers/i2c/busses/i2c-nct6775.c
@@ -0,0 +1,608 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * i2c-nct6775 - Driver for the SMBus master functionality of
+ *	       Nuvoton NCT677x Super-I/O chips
+ *
+ * Copyright (C) 2019  Adam Honse <calcprogrammer1@gmail.com>
+ *
+ * Derived from nct6775 hwmon driver
+ * Copyright (C) 2012  Guenter Roeck <linux@roeck-us.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/platform_device.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/hwmon-vid.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/i2c.h>
+#include <linux/acpi.h>
+#include <linux/bitops.h>
+#include <linux/dmi.h>
+#include <linux/io.h>
+#include <linux/nospec.h>
+
+#define DRVNAME "i2c-nct6775"
+
+/* Nuvoton SMBus address offsets */
+#define SMBHSTDAT       (0 + nuvoton_nct6793d_smba)
+#define SMBBLKSZ        (1 + nuvoton_nct6793d_smba)
+#define SMBHSTCMD       (2 + nuvoton_nct6793d_smba)
+#define SMBHSTIDX       (3 + nuvoton_nct6793d_smba)
+#define SMBHSTCTL       (4 + nuvoton_nct6793d_smba)
+#define SMBHSTADD       (5 + nuvoton_nct6793d_smba)
+#define SMBHSTERR       (9 + nuvoton_nct6793d_smba)
+#define SMBHSTSTS       (0xE + nuvoton_nct6793d_smba)
+
+/* Command register */
+#define NCT6793D_READ_BYTE      0
+#define NCT6793D_READ_WORD      1
+#define NCT6793D_READ_BLOCK     2
+#define NCT6793D_BLOCK_WRITE_READ_PROC_CALL 3
+#define NCT6793D_PROC_CALL      4
+#define NCT6793D_WRITE_BYTE     8
+#define NCT6793D_WRITE_WORD     9
+#define NCT6793D_WRITE_BLOCK    10
+
+/* Control register */
+#define NCT6793D_MANUAL_START   128
+#define NCT6793D_SOFT_RESET     64
+
+/* Error register */
+#define NCT6793D_NO_ACK         32
+
+/* Status register */
+#define NCT6793D_FIFO_EMPTY     1
+#define NCT6793D_FIFO_FULL      2
+#define NCT6793D_MANUAL_ACTIVE  4
+
+#define NCT6775_LD_SMBUS		0x0B
+
+/* Other settings */
+#define MAX_RETRIES		400
+
+enum kinds { nct6106, nct6775, nct6776, nct6779, nct6791, nct6792, nct6793,
+	     nct6795, nct6796, nct6798 };
+
+struct nct6775_sio_data {
+	int sioreg;
+	enum kinds kind;
+};
+
+/* used to set data->name = nct6775_device_names[data->sio_kind] */
+static const char * const nct6775_device_names[] = {
+	"nct6106",
+	"nct6775",
+	"nct6776",
+	"nct6779",
+	"nct6791",
+	"nct6792",
+	"nct6793",
+	"nct6795",
+	"nct6796",
+	"nct6798",
+};
+
+static const char * const nct6775_sio_names[] __initconst = {
+	"NCT6106D",
+	"NCT6775F",
+	"NCT6776D/F",
+	"NCT6779D",
+	"NCT6791D",
+	"NCT6792D",
+	"NCT6793D",
+	"NCT6795D",
+	"NCT6796D",
+	"NCT6798D",
+};
+
+#define SIO_REG_LDSEL		0x07	/* Logical device select */
+#define SIO_REG_DEVID		0x20	/* Device ID (2 bytes) */
+#define SIO_REG_SMBA		0x62	/* SMBus base address register */
+
+#define SIO_NCT6106_ID		0xc450
+#define SIO_NCT6775_ID		0xb470
+#define SIO_NCT6776_ID		0xc330
+#define SIO_NCT6779_ID		0xc560
+#define SIO_NCT6791_ID		0xc800
+#define SIO_NCT6792_ID		0xc910
+#define SIO_NCT6793_ID		0xd120
+#define SIO_NCT6795_ID		0xd350
+#define SIO_NCT6796_ID		0xd420
+#define SIO_NCT6798_ID		0xd428
+#define SIO_ID_MASK			0xFFF0
+
+static inline void
+superio_outb(int ioreg, int reg, int val)
+{
+	outb(reg, ioreg);
+	outb(val, ioreg + 1);
+}
+
+static inline int
+superio_inb(int ioreg, int reg)
+{
+	outb(reg, ioreg);
+	return inb(ioreg + 1);
+}
+
+static inline void
+superio_select(int ioreg, int ld)
+{
+	outb(SIO_REG_LDSEL, ioreg);
+	outb(ld, ioreg + 1);
+}
+
+static inline int
+superio_enter(int ioreg)
+{
+	/*
+	 * Try to reserve <ioreg> and <ioreg + 1> for exclusive access.
+	 */
+	if (!request_muxed_region(ioreg, 2, DRVNAME))
+		return -EBUSY;
+
+	outb(0x87, ioreg);
+	outb(0x87, ioreg);
+
+	return 0;
+}
+
+static inline void
+superio_exit(int ioreg)
+{
+	outb(0xaa, ioreg);
+	outb(0x02, ioreg);
+	outb(0x02, ioreg + 1);
+	release_region(ioreg, 2);
+}
+
+/*
+ * ISA constants
+ */
+
+#define IOREGION_ALIGNMENT	(~7)
+#define IOREGION_LENGTH		2
+#define ADDR_REG_OFFSET		0
+#define DATA_REG_OFFSET		1
+
+#define NCT6775_REG_BANK	0x4E
+#define NCT6775_REG_CONFIG	0x40
+
+static struct i2c_adapter *nct6775_adapter;
+
+struct i2c_nct6775_adapdata {
+	unsigned short smba;
+};
+
+/* Return negative errno on error. */
+static s32 nct6775_access(struct i2c_adapter *adap, u16 addr,
+		 unsigned short flags, char read_write,
+		 u8 command, int size, union i2c_smbus_data *data)
+{
+	struct i2c_nct6775_adapdata *adapdata = i2c_get_adapdata(adap);
+	unsigned short nuvoton_nct6793d_smba = adapdata->smba;
+	int i, len, cnt;
+	union i2c_smbus_data tmp_data;
+	int timeout = 0;
+
+	tmp_data.word = 0;
+	cnt = 0;
+	len = 0;
+
+	outb_p(NCT6793D_SOFT_RESET, SMBHSTCTL);
+
+	switch (size) {
+	case I2C_SMBUS_QUICK:
+		outb_p((addr << 1) | read_write,
+				SMBHSTADD);
+		break;
+	case I2C_SMBUS_BYTE_DATA:
+		tmp_data.byte = data->byte;
+	case I2C_SMBUS_BYTE:
+		outb_p((addr << 1) | read_write,
+				SMBHSTADD);
+		outb_p(command, SMBHSTIDX);
+		if (read_write == I2C_SMBUS_WRITE) {
+			outb_p(tmp_data.byte, SMBHSTDAT);
+			outb_p(NCT6793D_WRITE_BYTE, SMBHSTCMD);
+		} else {
+			outb_p(NCT6793D_READ_BYTE, SMBHSTCMD);
+		}
+		break;
+	case I2C_SMBUS_WORD_DATA:
+		outb_p((addr << 1) | read_write,
+				SMBHSTADD);
+		outb_p(command, SMBHSTIDX);
+		if (read_write == I2C_SMBUS_WRITE) {
+			outb_p(data->word & 0xff, SMBHSTDAT);
+			outb_p((data->word & 0xff00) >> 8, SMBHSTDAT);
+			outb_p(NCT6793D_WRITE_WORD, SMBHSTCMD);
+		} else {
+			outb_p(NCT6793D_READ_WORD, SMBHSTCMD);
+		}
+		break;
+	case I2C_SMBUS_BLOCK_DATA:
+		outb_p((addr << 1) | read_write,
+				SMBHSTADD);
+		outb_p(command, SMBHSTIDX);
+		if (read_write == I2C_SMBUS_WRITE) {
+			len = data->block[0];
+			if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
+				return -EINVAL;
+			outb_p(len, SMBBLKSZ);
+
+			cnt = 1;
+			if (len >= 4) {
+				for (i = cnt; i <= 4; i++)
+					outb_p(data->block[i], SMBHSTDAT);
+
+				len -= 4;
+				cnt += 4;
+			} else {
+				for (i = cnt; i <= len; i++)
+					outb_p(data->block[i], SMBHSTDAT);
+
+				len = 0;
+			}
+
+			outb_p(NCT6793D_WRITE_BLOCK, SMBHSTCMD);
+		} else {
+			return -EOPNOTSUPP;
+		}
+		break;
+	default:
+		dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
+		return -EOPNOTSUPP;
+	}
+
+	outb_p(NCT6793D_MANUAL_START, SMBHSTCTL);
+
+	while ((size == I2C_SMBUS_BLOCK_DATA) && (len > 0)) {
+		if (read_write == I2C_SMBUS_WRITE) {
+			timeout = 0;
+			while ((inb_p(SMBHSTSTS) & NCT6793D_FIFO_EMPTY) == 0) {
+				if (timeout > MAX_RETRIES)
+					return -ETIMEDOUT;
+
+				usleep_range(250, 500);
+				timeout++;
+			}
+
+			//Load more bytes into FIFO
+			if (len >= 4) {
+				for (i = cnt; i <= (cnt + 4); i++)
+					outb_p(data->block[i], SMBHSTDAT);
+
+				len -= 4;
+				cnt += 4;
+			} else {
+				for (i = cnt; i <= (cnt + len); i++)
+					outb_p(data->block[i], SMBHSTDAT);
+
+				len = 0;
+			}
+		} else {
+			return -EOPNOTSUPP;
+		}
+
+	}
+
+	//wait for manual mode to complete
+	timeout = 0;
+	while ((inb_p(SMBHSTSTS) & NCT6793D_MANUAL_ACTIVE) != 0) {
+		if (timeout > MAX_RETRIES)
+			return -ETIMEDOUT;
+
+		usleep_range(250, 500);
+		timeout++;
+	}
+
+	if ((inb_p(SMBHSTERR) & NCT6793D_NO_ACK) != 0)
+		return -ENXIO;
+
+	else if ((read_write == I2C_SMBUS_WRITE) || (size == I2C_SMBUS_QUICK))
+		return 0;
+
+	switch (size) {
+	case I2C_SMBUS_QUICK:
+	case I2C_SMBUS_BYTE_DATA:
+		data->byte = inb_p(SMBHSTDAT);
+		break;
+	case I2C_SMBUS_WORD_DATA:
+		data->word = inb_p(SMBHSTDAT) + (inb_p(SMBHSTDAT) << 8);
+		break;
+	}
+	return 0;
+}
+
+static u32 nct6775_func(struct i2c_adapter *adapter)
+{
+	return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
+	    I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
+	    I2C_FUNC_SMBUS_BLOCK_DATA;
+}
+
+static const struct i2c_algorithm smbus_algorithm = {
+	.smbus_xfer	= nct6775_access,
+	.functionality	= nct6775_func,
+};
+
+static int nct6775_add_adapter(unsigned short smba, const char *name, struct i2c_adapter **padap)
+{
+	struct i2c_adapter *adap;
+	struct i2c_nct6775_adapdata *adapdata;
+	int retval;
+
+	adap = kzalloc(sizeof(*adap), GFP_KERNEL);
+	if (adap == NULL)
+		return -ENOMEM;
+
+	adap->owner = THIS_MODULE;
+	adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
+	adap->algo = &smbus_algorithm;
+
+	adapdata = kzalloc(sizeof(*adapdata), GFP_KERNEL);
+	if (adapdata == NULL) {
+		kfree(adap);
+		return -ENOMEM;
+	}
+
+	adapdata->smba = smba;
+
+	snprintf(adap->name, sizeof(adap->name),
+		"SMBus NCT67xx adapter%s at %04x", name, smba);
+
+	i2c_set_adapdata(adap, adapdata);
+
+	retval = i2c_add_adapter(adap);
+	if (retval) {
+		kfree(adapdata);
+		kfree(adap);
+		return retval;
+	}
+
+	*padap = adap;
+	return 0;
+}
+
+static void nct6775_remove_adapter(struct i2c_adapter *adap)
+{
+	struct i2c_nct6775_adapdata *adapdata = i2c_get_adapdata(adap);
+
+	if (adapdata->smba) {
+		i2c_del_adapter(adap);
+		kfree(adapdata);
+		kfree(adap);
+	}
+}
+
+/*
+ * when Super-I/O functions move to a separate file, the Super-I/O
+ * bus will manage the lifetime of the device and this module will only keep
+ * track of the nct6775 driver. But since we use platform_device_alloc(), we
+ * must keep track of the device
+ */
+static struct platform_device *pdev[2];
+
+static int nct6775_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct nct6775_sio_data *sio_data = dev_get_platdata(dev);
+	struct resource *res;
+
+	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+	if (!devm_request_region(&pdev->dev, res->start, IOREGION_LENGTH,
+				 DRVNAME))
+		return -EBUSY;
+
+	switch (sio_data->kind) {
+	case nct6791:
+	case nct6792:
+	case nct6793:
+	case nct6795:
+	case nct6796:
+	case nct6798:
+		nct6775_add_adapter(res->start, "", &nct6775_adapter);
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static struct platform_driver i2c_nct6775_driver = {
+	.driver = {
+		.name	= DRVNAME,
+	},
+	.probe		= nct6775_probe,
+};
+
+static void __exit i2c_nct6775_exit(void)
+{
+	int i;
+
+	if (nct6775_adapter)
+		nct6775_remove_adapter(nct6775_adapter);
+
+	for (i = 0; i < ARRAY_SIZE(pdev); i++) {
+		if (pdev[i])
+			platform_device_unregister(pdev[i]);
+	}
+	platform_driver_unregister(&i2c_nct6775_driver);
+}
+
+/* nct6775_find() looks for a '627 in the Super-I/O config space */
+static int __init nct6775_find(int sioaddr, struct nct6775_sio_data *sio_data)
+{
+	u16 val;
+	int err;
+	int addr;
+
+	err = superio_enter(sioaddr);
+	if (err)
+		return err;
+
+	val = (superio_inb(sioaddr, SIO_REG_DEVID) << 8) |
+		superio_inb(sioaddr, SIO_REG_DEVID + 1);
+
+	switch (val & SIO_ID_MASK) {
+	case SIO_NCT6106_ID:
+		sio_data->kind = nct6106;
+		break;
+	case SIO_NCT6775_ID:
+		sio_data->kind = nct6775;
+		break;
+	case SIO_NCT6776_ID:
+		sio_data->kind = nct6776;
+		break;
+	case SIO_NCT6779_ID:
+		sio_data->kind = nct6779;
+		break;
+	case SIO_NCT6791_ID:
+		sio_data->kind = nct6791;
+		break;
+	case SIO_NCT6792_ID:
+		sio_data->kind = nct6792;
+		break;
+	case SIO_NCT6793_ID:
+		sio_data->kind = nct6793;
+		break;
+	case SIO_NCT6795_ID:
+		sio_data->kind = nct6795;
+		break;
+	case SIO_NCT6796_ID:
+		sio_data->kind = nct6796;
+		break;
+	case SIO_NCT6798_ID:
+		sio_data->kind = nct6798;
+		break;
+	default:
+		if (val != 0xffff)
+			pr_debug("unsupported chip ID: 0x%04x\n", val);
+		superio_exit(sioaddr);
+		return -ENODEV;
+	}
+
+	/* We have a known chip, find the SMBus I/O address */
+	superio_select(sioaddr, NCT6775_LD_SMBUS);
+	val = (superio_inb(sioaddr, SIO_REG_SMBA) << 8)
+	    | superio_inb(sioaddr, SIO_REG_SMBA + 1);
+	addr = val & IOREGION_ALIGNMENT;
+	if (addr == 0) {
+		pr_err("Refusing to enable a Super-I/O device with a base I/O port 0\n");
+		superio_exit(sioaddr);
+		return -ENODEV;
+	}
+
+	superio_exit(sioaddr);
+	pr_info("Found %s or compatible chip at %#x:%#x\n",
+		nct6775_sio_names[sio_data->kind], sioaddr, addr);
+	sio_data->sioreg = sioaddr;
+
+	return addr;
+}
+
+static int __init i2c_nct6775_init(void)
+{
+	int i, err;
+	bool found = false;
+	int address;
+	struct resource res;
+	struct nct6775_sio_data sio_data;
+	int sioaddr[2] = { 0x2e, 0x4e };
+
+	err = platform_driver_register(&i2c_nct6775_driver);
+	if (err)
+		return err;
+
+	/*
+	 * initialize sio_data->kind and sio_data->sioreg.
+	 *
+	 * when Super-I/O functions move to a separate file, the Super-I/O
+	 * driver will probe 0x2e and 0x4e and auto-detect the presence of a
+	 * nct6775 hardware monitor, and call probe()
+	 */
+	for (i = 0; i < ARRAY_SIZE(pdev); i++) {
+		address = nct6775_find(sioaddr[i], &sio_data);
+		if (address <= 0)
+			continue;
+
+		found = true;
+
+		pdev[i] = platform_device_alloc(DRVNAME, address);
+		if (!pdev[i]) {
+			err = -ENOMEM;
+			goto exit_device_unregister;
+		}
+
+		err = platform_device_add_data(pdev[i], &sio_data,
+					       sizeof(struct nct6775_sio_data));
+		if (err)
+			goto exit_device_put;
+
+		memset(&res, 0, sizeof(res));
+		res.name = DRVNAME;
+		res.start = address;
+		res.end = address + IOREGION_LENGTH - 1;
+		res.flags = IORESOURCE_IO;
+
+		err = acpi_check_resource_conflict(&res);
+		if (err) {
+			platform_device_put(pdev[i]);
+			pdev[i] = NULL;
+			continue;
+		}
+
+		err = platform_device_add_resources(pdev[i], &res, 1);
+		if (err)
+			goto exit_device_put;
+
+		/* platform_device_add calls probe() */
+		err = platform_device_add(pdev[i]);
+		if (err)
+			goto exit_device_put;
+	}
+	if (!found) {
+		err = -ENODEV;
+		goto exit_unregister;
+	}
+
+	return 0;
+
+exit_device_put:
+	platform_device_put(pdev[i]);
+exit_device_unregister:
+	while (--i >= 0) {
+		if (pdev[i])
+			platform_device_unregister(pdev[i]);
+	}
+exit_unregister:
+	platform_driver_unregister(&i2c_nct6775_driver);
+	return err;
+}
+
+MODULE_AUTHOR("Adam Honse <calcprogrammer1@gmail.com>");
+MODULE_DESCRIPTION("SMBus driver for NCT6775F and compatible chips");
+MODULE_LICENSE("GPL");
+
+module_init(i2c_nct6775_init);
+module_exit(i2c_nct6775_exit);
