写一个IMX6uLL LED闪烁的驱动程序

以下是一个简单的 IMX6uLL LED 闪烁的驱动程序的例子：

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>

/* GPIO register offsets */
#define GPIO_DR_OFFSET 0x0
#define GPIO_GDIR_OFFSET 0x4
#define GPIO_PSR_OFFSET 0x8
#define GPIO_ICR1_OFFSET 0x10
#define GPIO_ICR2_OFFSET 0x14

/* LED GPIO pin number */
#define LED_GPIO_PIN 10

/* Module information */
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("LED Blink Driver");
MODULE_LICENSE("GPL");

/* GPIO base address */
static void __iomem *gpio_base;

/* Module initialization function */
static int led_blink_probe(struct platform_device *pdev)
{
    int ret;
    u32 gpio_val;

    /* Get the GPIO base address from the device tree */
    struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    gpio_base = devm_ioremap_resource(&pdev->dev, res);
    if (IS_ERR(gpio_base)) {
        dev_err(&pdev->dev, "Failed to map GPIO registers\n");
        return PTR_ERR(gpio_base);
    }

    /* Configure the GPIO direction */
    gpio_val = readl(gpio_base + GPIO_GDIR_OFFSET);
    gpio_val |= (1 << LED_GPIO_PIN);
    writel(gpio_val, gpio_base + GPIO_GDIR_OFFSET);

    /* Blink the LED */
    while (!kthread_should_stop()) {
        gpio_val = readl(gpio_base + GPIO_DR_OFFSET);
        gpio_val ^= (1 << LED_GPIO_PIN);
        writel(gpio_val, gpio_base + GPIO_DR_OFFSET);
        msleep(500);
    }

    return 0;
}

/* Module exit function */
static int led_blink_remove(struct platform_device *pdev)
{
    return 0;
}

/* Device tree match table */
static const struct of_device_id led_blink_of_match[] = {
    { .compatible = "led-blink-gpio", },
    {},
};

MODULE_DEVICE_TABLE(of, led_blink_of_match);

/* Platform driver structure */
static struct platform_driver led_blink_driver = {
    .probe = led_blink_probe,
    .remove = led_blink_remove,
    .driver = {
        .name = "led-blink-gpio",
        .of_match_table = led_blink_of_match,
    },
};

/* Module initialization function */
static int __init led_blink_init(void)
{
    /* Register the platform driver */
    return platform_driver_register(&led_blink_driver);
}

/* Module exit function */
static void __exit led_blink_exit(void)
{
    /* Unregister the platform driver */
    platform_driver_unregister(&led_blink_driver);
}

/* Module entry and exit points */
module_init(led_blink_init);
module_exit(led_blink_exit);

这个驱动程序使用了平台设备和设备树来获取 LED GPIO 的地址和配置信息，并使用 GPIO 控制 LED 的闪烁。在这个例子中，我们使用了 GPIO1_IO10 作为 LED 的控制引脚，然后使用 `msleep()` 函数来控制闪烁的频率。注意，驱动程序中的代码仅供参考，需要针对具体的硬件进行修改。