diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 46c030a49186faabaa588afd2d284975c72c2017..61f4dbf9d97ee84afbd68f680c498e46a5c649ea 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 0e41c45a2936b897ab1a238d79997f4632a629c4..79429b9b4e202fc680f2d557c0141cafabef6b4f 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -279,6 +279,18 @@ 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 b3e039c3ae8d6146d64d9bf30b45827f5f7c915e..915c7de1dd1b7f180b7cada8fa1390d648f62e8a 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -74,6 +74,7 @@ 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 0000000000000000000000000000000000000000..1ef85b0c2b1f2cc414f2393cd035a94a03ed7565
--- /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");