RK3568使能UART串口设备，并生成/dev/ttySx设备节点的代码

在Linux系统中，启用RK3568芯片的UART串口并将其映射到/dev/ttySx设备节点通常涉及到硬件初始化、注册字符设备驱动以及配置文件设置等步骤。这里是一个简化版的示例代码片段，假设你已经完成了相关的硬件连接和头文件包含：

#include <linux/module.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/platform_device.h>
#include <linux/tty.h>
#include <linux/serial_core.h>
#include <asm/io.h>

#define UART_NAME "rk3568_uart"
#define DEVICE_NAME "ttyS0" // 这里可以根据实际情况更改

static struct serial_port uart_data = {
    .port_id      = 0, // 需要确认实际的端口号
    .irq          = RXIrqLine, // RX中断线
};

static int rk3568_uart_probe(struct platform_device *pdev) {
    struct resource *res;
    int ret;

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (!res) {
        pr_err("Failed to get memory resource\n");
        return -ENODEV;
    }

    /* 初始化UART硬件 */
    // ... (具体的初始化步骤, 包括地址偏移和控制寄存器操作)

    /* 注册字符设备 */
    ret = alloc_chrdev_region(&minor, 0, 1, UART_NAME);
    if (ret < 0) {
        pr_err("Failed to allocate device region\n");
        return ret;
    }
    uart_data.dev = &device;
    device.type = TTY_DEV;
    device.major = MAJOR(UART_MINOR);
    device.minor = minor;
    device.name = UART_NAME;

    // 创建tty_driver实例
    tty_driver_init(&driver);
    driver.name = UART_NAME;
    driver.owner = THIS_MODULE;
    driver.driver_features = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_CHANNELS;
    driver.init_termios = init_termios;
    driver_termios(driver);

    // 将驱动与硬件关联起来
    ret = serial8250_register(&uart_data, &driver);
    if (ret < 0) {
        unregister_chrdev_region(minor, 1);
        return ret;
    }

    /* 设置设备名称 */
    device_node_name(res->node, DEVICE_NAME);
    platform_set_drvdata(pdev, &device);

    printk(KERN_INFO "%s: Registered as %s at /dev/%s\n", __func__, UART_NAME, DEVICE_NAME);
    return 0;
}

static void rk3568_uart_remove(struct platform_device *pdev) {
    struct tty_driver *driver = platform_get_drvdata(pdev);
    serial8250_unregister(driver);
    unregister_chrdev_region(driver->minor, 1);
    device_destroy(device_tree_root, devm_of_node_to_resource(pdev->dev.of_node, 0)->res_id);
}

static struct of_device_id rk3568_uart_match[] = {
    { .compatible = "rk3568,uart", },
    { /* end of list */ }
};
MODULE_DEVICE_TABLE(of, rk3568_uart_match);

static struct platform_driver rk3568_uart_driver = {
    .probe          = rk3568_uart_probe,
    .remove         = rk3568_uart_remove,
    .driver         = {
        .name   = UART_NAME,
        .of_match_table = rk3568_uart_match,
    },
};

module_platform_driver(rk3568_uart_driver);

MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("Raspberry Pi 3568 UART Driver");
MODULE_LICENSE("GPL");

//