diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 46c030a..61f4dbf 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1364,6 +1364,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			Format: <unsigned int> such that (rxsize & ~0x1fffc0) == 0.
 			Default: 1024
 
+	gpio-mockup.gpio_mockup_ranges
+			[HW] Sets the ranges of gpiochip of for this device.
+			Format: <start1>,<end1>,<start2>,<end2>...
+
 	hardlockup_all_cpu_backtrace=
 			[KNL] Should the hard-lockup detector generate
 			backtraces on all cpus.
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 5eb7c86..4393bdf 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -271,6 +271,18 @@ config GPIO_MM_LANTIQ
 	  (EBU) found on Lantiq SoCs. The gpios are output only as they are
 	  created by attaching a 16bit latch to the bus.
 
+config GPIO_MOCKUP
+	tristate "GPIO Testing Driver"
+	depends on GPIOLIB
+	select GPIO_SYSFS
+	help
+	  This enables GPIO Testing driver, which provides a way to test GPIO
+	  subsystem through sysfs(or char device) and debugfs. GPIO_SYSFS
+	  must be selected for this test.
+	  User could use it through the script in
+	  tools/testing/selftests/gpio/gpio-mockup.sh. Reference the usage in
+	  it.
+
 config GPIO_MOXART
 	bool "MOXART GPIO support"
 	depends on ARCH_MOXART || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 691fb3a..540d7ab 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -72,6 +72,7 @@ obj-$(CONFIG_GPIO_MC9S08DZ60)	+= gpio-mc9s08dz60.o
 obj-$(CONFIG_GPIO_MCP23S08)	+= gpio-mcp23s08.o
 obj-$(CONFIG_GPIO_ML_IOH)	+= gpio-ml-ioh.o
 obj-$(CONFIG_GPIO_MM_LANTIQ)	+= gpio-mm-lantiq.o
+obj-$(CONFIG_GPIO_MOCKUP)      += gpio-mockup.o
 obj-$(CONFIG_GPIO_MOXART)	+= gpio-moxart.o
 obj-$(CONFIG_GPIO_MPC5200)	+= gpio-mpc5200.o
 obj-$(CONFIG_GPIO_MPC8XXX)	+= gpio-mpc8xxx.o
diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
new file mode 100644
index 0000000..1ef85b0
--- /dev/null
+++ b/drivers/gpio/gpio-mockup.c
@@ -0,0 +1,214 @@
+/*
+ * GPIO Testing Device Driver
+ *
+ * Copyright (C) 2014  Kamlakant Patel <kamlakant.patel@broadcom.com>
+ * Copyright (C) 2015-2016  Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>
+ *
+ * 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.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/gpio/driver.h>
+#include <linux/platform_device.h>
+
+#define GPIO_NAME	"gpio-mockup"
+#define	MAX_GC		10
+
+enum direction {
+	OUT,
+	IN
+};
+
+/*
+ * struct gpio_pin_status - structure describing a GPIO status
+ * @dir:       Configures direction of gpio as "in" or "out", 0=in, 1=out
+ * @value:     Configures status of the gpio as 0(low) or 1(high)
+ */
+struct gpio_pin_status {
+	enum direction dir;
+	bool value;
+};
+
+struct mockup_gpio_controller {
+	struct gpio_chip gc;
+	struct gpio_pin_status *stats;
+};
+
+static int gpio_mockup_ranges[MAX_GC << 1];
+static int gpio_mockup_params_nr;
+module_param_array(gpio_mockup_ranges, int, &gpio_mockup_params_nr, 0400);
+
+const char pins_name_start = 'A';
+
+static int mockup_gpio_get(struct gpio_chip *gc, unsigned int offset)
+{
+	struct mockup_gpio_controller *cntr = gpiochip_get_data(gc);
+
+	return cntr->stats[offset].value;
+}
+
+static void mockup_gpio_set(struct gpio_chip *gc, unsigned int offset,
+			    int value)
+{
+	struct mockup_gpio_controller *cntr = gpiochip_get_data(gc);
+
+	cntr->stats[offset].value = !!value;
+}
+
+static int mockup_gpio_dirout(struct gpio_chip *gc, unsigned int offset,
+			      int value)
+{
+	struct mockup_gpio_controller *cntr = gpiochip_get_data(gc);
+
+	mockup_gpio_set(gc, offset, value);
+	cntr->stats[offset].dir = OUT;
+	return 0;
+}
+
+static int mockup_gpio_dirin(struct gpio_chip *gc, unsigned int offset)
+{
+	struct mockup_gpio_controller *cntr = gpiochip_get_data(gc);
+
+	cntr->stats[offset].dir = IN;
+	return 0;
+}
+
+static int mockup_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
+{
+	struct mockup_gpio_controller *cntr = gpiochip_get_data(gc);
+
+	return cntr->stats[offset].dir;
+}
+
+static int mockup_gpio_add(struct device *dev,
+			   struct mockup_gpio_controller *cntr,
+			   const char *name, int base, int ngpio)
+{
+	int ret;
+
+	cntr->gc.base = base;
+	cntr->gc.ngpio = ngpio;
+	cntr->gc.label = name;
+	cntr->gc.owner = THIS_MODULE;
+	cntr->gc.parent = dev;
+	cntr->gc.get = mockup_gpio_get;
+	cntr->gc.set = mockup_gpio_set;
+	cntr->gc.direction_output = mockup_gpio_dirout;
+	cntr->gc.direction_input = mockup_gpio_dirin;
+	cntr->gc.get_direction = mockup_gpio_get_direction;
+	cntr->stats = devm_kzalloc(dev, sizeof(*cntr->stats) * cntr->gc.ngpio,
+				   GFP_KERNEL);
+	if (!cntr->stats) {
+		ret = -ENOMEM;
+		goto err;
+	}
+	ret = devm_gpiochip_add_data(dev, &cntr->gc, cntr);
+	if (ret)
+		goto err;
+
+	dev_info(dev, "gpio<%d..%d> add successful!", base, base + ngpio);
+	return 0;
+err:
+	dev_err(dev, "gpio<%d..%d> add failed!", base, base + ngpio);
+	return ret;
+}
+
+static int mockup_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct mockup_gpio_controller *cntr;
+	int ret;
+	int i;
+	int base;
+	int ngpio;
+	char chip_name[sizeof(GPIO_NAME) + 3];
+
+	if (gpio_mockup_params_nr < 2)
+		return -EINVAL;
+
+	cntr = devm_kzalloc(dev, sizeof(*cntr) * (gpio_mockup_params_nr >> 1),
+			    GFP_KERNEL);
+	if (!cntr)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, cntr);
+
+	for (i = 0; i < gpio_mockup_params_nr >> 1; i++) {
+		base = gpio_mockup_ranges[i * 2];
+		if (base == -1)
+			ngpio = gpio_mockup_ranges[i * 2 + 1];
+		else
+			ngpio = gpio_mockup_ranges[i * 2 + 1] - base;
+
+		if (ngpio >= 0) {
+			sprintf(chip_name, "%s-%c", GPIO_NAME,
+				pins_name_start + i);
+			ret = mockup_gpio_add(dev, &cntr[i],
+					      chip_name, base, ngpio);
+		} else {
+			ret = -1;
+		}
+		if (ret) {
+			if (base < 0)
+				dev_err(dev, "gpio<%d..%d> add failed\n",
+					base, ngpio);
+			else
+				dev_err(dev, "gpio<%d..%d> add failed\n",
+					base, base + ngpio);
+
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static struct platform_driver mockup_gpio_driver = {
+	.driver = {
+		   .name = GPIO_NAME,
+		   },
+	.probe = mockup_gpio_probe,
+};
+
+static struct platform_device *pdev;
+static int __init mock_device_init(void)
+{
+	int err;
+
+	pdev = platform_device_alloc(GPIO_NAME, -1);
+	if (!pdev)
+		return -ENOMEM;
+
+	err = platform_device_add(pdev);
+	if (err) {
+		platform_device_put(pdev);
+		return err;
+	}
+
+	err = platform_driver_register(&mockup_gpio_driver);
+	if (err) {
+		platform_device_unregister(pdev);
+		return err;
+	}
+
+	return 0;
+}
+
+static void __exit mock_device_exit(void)
+{
+	platform_driver_unregister(&mockup_gpio_driver);
+	platform_device_unregister(pdev);
+}
+
+module_init(mock_device_init);
+module_exit(mock_device_exit);
+
+MODULE_AUTHOR("Kamlakant Patel <kamlakant.patel@broadcom.com>");
+MODULE_AUTHOR("Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>");
+MODULE_DESCRIPTION("GPIO Testing driver");
+MODULE_LICENSE("GPL v2");
