diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 7284206b278b..a4687a6abe75 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -887,6 +887,13 @@ config I2C_OWL
 	  Say Y here if you want to use the I2C bus controller on
 	  the Actions Semiconductor Owl SoC's.
 
+config I2C_LS2X
+	tristate "Loongson LS2X I2C adapter"
+	depends on MACH_LOONGSON64 || COMPILE_TEST
+	help
+	  If you say yes to this option, support will be included for the
+	  I2C interface on the Loongson's LS2K/LS7A Platform-Bridge.
+
 config I2C_PASEMI
 	tristate "PA Semi SMBus interface"
 	depends on PPC_PASEMI && PCI
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index c5cac15f075c..721841361e34 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -86,6 +86,7 @@ obj-$(CONFIG_I2C_MV64XXX)	+= i2c-mv64xxx.o
 obj-$(CONFIG_I2C_MXS)		+= i2c-mxs.o
 obj-$(CONFIG_I2C_NOMADIK)	+= i2c-nomadik.o
 obj-$(CONFIG_I2C_NPCM)		+= i2c-npcm7xx.o
+obj-$(CONFIG_I2C_LS2X)		+= i2c-ls2x.o
 obj-$(CONFIG_I2C_OCORES)	+= i2c-ocores.o
 obj-$(CONFIG_I2C_OMAP)		+= i2c-omap.o
 obj-$(CONFIG_I2C_OWL)		+= i2c-owl.o
diff --git a/drivers/i2c/busses/i2c-ls2x.c b/drivers/i2c/busses/i2c-ls2x.c
new file mode 100644
index 000000000000..80d8f1e12876
--- /dev/null
+++ b/drivers/i2c/busses/i2c-ls2x.c
@@ -0,0 +1,364 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Loongson-2K/7A I2C master mode driver
+ *
+ * Copyright (C) 2013 Loongson Technology Corporation Limited
+ * Copyright (C) 2014-2017 Lemote, Inc.
+ *
+ * Originally written by liushaozong
+ */
+
+#include <linux/i2c.h>
+#include <linux/acpi.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/completion.h>
+#include <linux/platform_device.h>
+
+#define LS2X_I2C_PRER_LO_REG	0x0
+#define LS2X_I2C_PRER_HI_REG	0x1
+#define LS2X_I2C_CTR_REG	0x2
+#define LS2X_I2C_TXR_REG	0x3
+#define LS2X_I2C_RXR_REG	0x3
+#define LS2X_I2C_CR_REG		0x4
+#define LS2X_I2C_SR_REG		0x4
+
+#define LS2X_I2C_CMD_START	BIT(7)
+#define LS2X_I2C_CMD_STOP	BIT(6)
+#define LS2X_I2C_CMD_READ	BIT(5)
+#define LS2X_I2C_CMD_WRITE	BIT(4)
+#define LS2X_I2C_CMD_ACK	BIT(3)
+#define LS2X_I2C_CMD_IACK	BIT(0)
+
+#define LS2X_I2C_SR_NOACK	BIT(7)
+#define LS2X_I2C_SR_BUSY	BIT(6)
+#define LS2X_I2C_SR_AL		BIT(5)
+#define LS2X_I2C_SR_TIP		BIT(1)
+#define LS2X_I2C_SR_IF		BIT(0)
+
+#define I2C_MAX_RETRIES		5
+
+/* I2C clock frequency 50M */
+#define I2C_CLK_RATE_50M	(50 * 1000000)
+
+#define i2c_readb(addr)		readb(dev->base + addr)
+#define i2c_writeb(val, addr)	writeb(val, dev->base + addr)
+
+struct ls2x_i2c_dev {
+	unsigned int		suspended:1;
+	struct device		*dev;
+	void __iomem		*base;
+	int			irq;
+	u32			bus_freq_hz;
+	struct completion	cmd_complete;
+	struct i2c_adapter	adapter;
+};
+
+static void i2c_stop(struct ls2x_i2c_dev *dev)
+{
+again:
+	i2c_writeb(LS2X_I2C_CMD_STOP, LS2X_I2C_CR_REG);
+	wait_for_completion(&dev->cmd_complete);
+
+	i2c_readb(LS2X_I2C_SR_REG);
+
+	while (i2c_readb(LS2X_I2C_SR_REG) & LS2X_I2C_SR_BUSY)
+		goto again;
+}
+
+static int ls2x_i2c_start(struct ls2x_i2c_dev *dev,
+		     int dev_addr, int flags)
+{
+	int retry = I2C_MAX_RETRIES;
+	unsigned char addr = (dev_addr & 0x7f) << 1;
+
+	addr |= (flags & I2C_M_RD) ? 1 : 0;
+start:
+	mdelay(1);
+	i2c_writeb(addr, LS2X_I2C_TXR_REG);
+	dev_dbg(dev->dev, "%s <line%d>: i2c device address: 0x%x\n",
+			__func__, __LINE__, addr);
+
+	i2c_writeb((LS2X_I2C_CMD_START | LS2X_I2C_CMD_WRITE),
+			LS2X_I2C_CR_REG);
+	wait_for_completion(&dev->cmd_complete);
+
+	if (i2c_readb(LS2X_I2C_SR_REG) & LS2X_I2C_SR_NOACK) {
+		i2c_stop(dev);
+		while (retry--)
+			goto start;
+		dev_info(dev->dev, "There is no i2c device ack\n");
+		return 0;
+	}
+
+	return 1;
+}
+
+static void ls2x_i2c_reginit(struct ls2x_i2c_dev *dev)
+{
+	u16 val = 0x12c;
+
+	if (dev->bus_freq_hz)
+		val = I2C_CLK_RATE_50M / (5 * dev->bus_freq_hz) - 1;
+
+	i2c_writeb(0, LS2X_I2C_CTR_REG);
+	i2c_writeb(val & 0xff, LS2X_I2C_PRER_LO_REG);
+	i2c_writeb((val & 0xff00) >> 8, LS2X_I2C_PRER_HI_REG);
+	i2c_writeb(0xc0, LS2X_I2C_CTR_REG);
+}
+
+static int ls2x_i2c_read(struct ls2x_i2c_dev *dev,
+			unsigned char *buf, int count)
+{
+	int i;
+	int cmd = LS2X_I2C_CMD_READ;
+
+	for (i = 0; i < count; i++) {
+		if (i == count - 1)
+			cmd |= LS2X_I2C_CMD_ACK;
+
+		i2c_writeb(cmd, LS2X_I2C_CR_REG);
+		wait_for_completion(&dev->cmd_complete);
+
+		buf[i] = i2c_readb(LS2X_I2C_RXR_REG);
+		dev_dbg(dev->dev, "%s <line%d>: read buf[%d] <= %02x\n",
+				__func__, __LINE__, i, buf[i]);
+	}
+
+	return i;
+}
+
+static int ls2x_i2c_write(struct ls2x_i2c_dev *dev,
+			unsigned char *buf, int count)
+{
+	int i;
+
+	for (i = 0; i < count; i++) {
+		i2c_writeb(buf[i], LS2X_I2C_TXR_REG);
+		dev_dbg(dev->dev, "%s <line%d>: write buf[%d] => %02x\n",
+				__func__, __LINE__, i, buf[i]);
+
+		i2c_writeb(LS2X_I2C_CMD_WRITE, LS2X_I2C_CR_REG);
+		wait_for_completion(&dev->cmd_complete);
+
+		if (i2c_readb(LS2X_I2C_SR_REG) & LS2X_I2C_SR_NOACK) {
+			dev_dbg(dev->dev, "%s <line%d>: device no ack\n",
+					__func__, __LINE__);
+			i2c_stop(dev);
+			return 0;
+		}
+	}
+
+	return i;
+}
+
+static int ls2x_i2c_doxfer(struct ls2x_i2c_dev *dev,
+			struct i2c_msg *msgs, int num)
+{
+	int i;
+	struct i2c_msg *m = msgs;
+
+	for (i = 0; i < num; i++) {
+		reinit_completion(&dev->cmd_complete);
+		if (!ls2x_i2c_start(dev, m->addr, m->flags))
+			return 0;
+
+		if (m->flags & I2C_M_RD)
+			ls2x_i2c_read(dev, m->buf, m->len);
+		else
+			ls2x_i2c_write(dev, m->buf, m->len);
+		++m;
+	}
+
+	i2c_stop(dev);
+
+	return i;
+}
+
+static int ls2x_i2c_xfer(struct i2c_adapter *adap,
+			struct i2c_msg *msgs, int num)
+{
+	int ret, retry;
+	struct ls2x_i2c_dev *dev;
+
+	dev = i2c_get_adapdata(adap);
+	for (retry = 0; retry < adap->retries; retry++) {
+		ret = ls2x_i2c_doxfer(dev, msgs, num);
+		if (ret != -EAGAIN)
+			return ret;
+
+		udelay(100);
+	}
+
+	return -EREMOTEIO;
+}
+
+static unsigned int ls2x_i2c_func(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm ls2x_i2c_algo = {
+	.master_xfer	= ls2x_i2c_xfer,
+	.functionality	= ls2x_i2c_func,
+};
+
+/*
+ * Interrupt service routine. This gets called whenever an I2C interrupt
+ * occurs.
+ */
+static irqreturn_t ls2x_i2c_isr(int this_irq, void *dev_id)
+{
+	unsigned char iflag;
+	struct ls2x_i2c_dev *dev = dev_id;
+
+	iflag = i2c_readb(LS2X_I2C_SR_REG);
+
+	if (iflag & LS2X_I2C_SR_IF) {
+		i2c_writeb(LS2X_I2C_CMD_IACK, LS2X_I2C_CR_REG);
+		complete(&dev->cmd_complete);
+	} else
+		return IRQ_NONE;
+
+	return IRQ_HANDLED;
+}
+
+static int ls2x_i2c_probe(struct platform_device *pdev)
+{
+	int r;
+	struct ls2x_i2c_dev *dev;
+	struct i2c_adapter *adap;
+
+	dev = devm_kzalloc(&pdev->dev, sizeof(struct ls2x_i2c_dev), GFP_KERNEL);
+	if (unlikely(!dev))
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, dev);
+	init_completion(&dev->cmd_complete);
+	dev->dev = &pdev->dev;
+
+	/* Map hardware registers */
+	dev->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(dev->base))
+		return PTR_ERR(dev->base);
+
+	r = platform_get_irq(pdev, 0);
+	if (unlikely(r <= 0))
+		return -ENODEV;
+	dev->irq = r;
+
+	r = devm_request_irq(&pdev->dev, dev->irq, ls2x_i2c_isr,
+			      IRQF_SHARED, "ls2x-i2c", dev);
+	if (unlikely(r)) {
+		dev_err(dev->dev, "failure requesting irq %i\n", dev->irq);
+		return r;
+	}
+
+	dev->bus_freq_hz = i2c_acpi_find_bus_speed(&pdev->dev);
+	if (!dev->bus_freq_hz)
+		device_property_read_u32(&pdev->dev, "clock-frequency",
+					&dev->bus_freq_hz);
+
+	ls2x_i2c_reginit(dev);
+
+	/* Add the i2c adapter */
+	adap = &dev->adapter;
+	i2c_set_adapdata(adap, dev);
+	adap->nr = pdev->id;
+	strscpy(adap->name, pdev->name, sizeof(adap->name));
+	adap->owner = THIS_MODULE;
+	adap->class = I2C_CLASS_HWMON;
+	adap->retries = I2C_MAX_RETRIES;
+	adap->algo = &ls2x_i2c_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+	ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
+
+	/* i2c device drivers may be active on return from add_adapter() */
+	r = i2c_add_adapter(adap);
+	if (r) {
+		dev_err(dev->dev, "failure adding adapter\n");
+		return r;
+	}
+
+	return 0;
+}
+
+static int ls2x_i2c_remove(struct platform_device *pdev)
+{
+	struct ls2x_i2c_dev *dev = platform_get_drvdata(pdev);
+
+	i2c_del_adapter(&dev->adapter);
+	return 0;
+}
+
+static int __maybe_unused ls2x_i2c_suspend_noirq(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct ls2x_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
+
+	i2c_dev->suspended = 1;
+
+	return 0;
+}
+
+static int __maybe_unused ls2x_i2c_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct ls2x_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
+
+	i2c_dev->suspended = 0;
+	ls2x_i2c_reginit(i2c_dev);
+
+	return 0;
+}
+
+static const struct dev_pm_ops ls2x_i2c_dev_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(ls2x_i2c_suspend_noirq, ls2x_i2c_resume)
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id ls2x_i2c_id_table[] = {
+	{.compatible = "loongson,ls2k-i2c"},
+	{.compatible = "loongson,ls7a-i2c"},
+	{},
+};
+MODULE_DEVICE_TABLE(of, ls2x_i2c_id_table);
+#endif
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id ls2x_i2c_acpi_match[] = {
+	{"LOON0004"},
+	{}
+};
+MODULE_DEVICE_TABLE(acpi, ls2x_i2c_acpi_match);
+#endif
+
+static struct platform_driver ls2x_i2c_driver = {
+	.probe		= ls2x_i2c_probe,
+	.remove		= ls2x_i2c_remove,
+	.driver		= {
+		.name	= "ls2x-i2c",
+		.owner	= THIS_MODULE,
+		.pm	= &ls2x_i2c_dev_pm_ops,
+		.of_match_table = of_match_ptr(ls2x_i2c_id_table),
+		.acpi_match_table = ACPI_PTR(ls2x_i2c_acpi_match),
+	},
+};
+
+static int __init ls2x_i2c_init_driver(void)
+{
+	return platform_driver_register(&ls2x_i2c_driver);
+}
+subsys_initcall(ls2x_i2c_init_driver);
+
+static void __exit ls2x_i2c_exit_driver(void)
+{
+	platform_driver_unregister(&ls2x_i2c_driver);
+}
+module_exit(ls2x_i2c_exit_driver);
+
+MODULE_AUTHOR("Loongson Technology Corporation Limited");
+MODULE_DESCRIPTION("Loongson LS2X I2C bus adapter");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ls2x-i2c");
