用platform bus driver的方式来写上述程序 ，给出设备树配置

好的，以下是使用platform bus driver的方式编写Winbond SPI Flash驱动程序的示例代码，以及相应的设备树配置。

首先，创建一个名为“winbond-spi-flash”或类似的设备节点，并将其添加到设备树中。以下是一个简单的设备树配置示例：

&spi0 {
    winbond_spi_flash: winbond-spi-flash@0 {
        compatible = "winbond,w25q64";
        reg = <0>;
        spi-max-frequency = <100000000>;
    };
};

在驱动程序中，您需要实现probe和remove函数，用于初始化和清理设备资源。以下是一个简单的驱动程序示例：

#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/spi/spi.h>

#define WINBOND_CMD_READ_ID 0x9f
#define WINBOND_CMD_READ_DATA 0x03

static struct spi_device *winbond_spi_device;

static int winbond_spi_probe(struct platform_device *pdev)
{
    int ret;
    struct device *dev = &pdev->dev;
    u8 id[3];

    printk(KERN_INFO "winbond_spi: probe\n");

    // get the SPI device pointer
    winbond_spi_device = dev_get_drvdata(dev);

    // read the Winbond Flash ID
    struct spi_transfer transfer = {
        .tx_buf = &WINBOND_CMD_READ_ID,
        .rx_buf = id,
        .len = 3,
    };
    struct spi_message message;
    spi_message_init(&message);
    spi_message_add_tail(&transfer, &message);
    ret = spi_sync(winbond_spi_device, &message);
    if (ret < 0) {
        printk(KERN_ERR "winbond_spi: failed to read Winbond Flash ID\n");
        return ret;
    }
    printk(KERN_INFO "winbond_spi: Winbond Flash ID: %02x %02x %02x\n",
           id[0], id[1], id[2]);

    return 0;
}

static int winbond_spi_remove(struct platform_device *pdev)
{
    printk(KERN_INFO "winbond_spi: remove\n");
    return 0;
}

static struct platform_driver winbond_spi_driver = {
    .driver = {
        .name = "winbond-spi-flash",
    },
    .probe = winbond_spi_probe,
    .remove = winbond_spi_remove,
};

static int winbond_spi_probe(struct spi_device *spi)
{
    return 0;
}

static int winbond_spi_remove(struct spi_device *spi)
{
    return 0;
}

static struct spi_driver winbond_spi_driver = {
    .driver = {
        .name = "winbond-spi-flash",
    },
    .probe = winbond_spi_probe,
    .remove = winbond_spi_remove,
};

static int __init winbond_spi_init(void)
{
    int ret;
    struct spi_master *master;
    struct platform_device *pdev;

    printk(KERN_INFO "winbond_spi: init\n");

    // find the SPI master controller
    master = spi_busnum_to_master(0);
    if (!master) {
        printk(KERN_ERR "winbond_spi: failed to find SPI master controller\n");
        return -ENODEV;
    }

    // register the SPI driver
    ret = spi_register_driver(&winbond_spi_driver);
    if (ret < 0) {
        printk(KERN_ERR "winbond_spi: failed to register SPI driver\n");
        return ret;
    }

    // create the platform device
    pdev = platform_device_alloc("winbond-spi-flash", 0);
    if (!pdev) {
        printk(KERN_ERR "winbond_spi: failed to allocate platform device\n");
        return -ENOMEM;
    }
    platform_device_add(pdev);

    return 0;
}

static void __exit winbond_spi_exit(void)
{
    printk(KERN_INFO "winbond_spi: exit\n");

    // remove the platform device
    platform_device_unregister(&winbond_spi_device->dev);

    // unregister the SPI driver
    spi_unregister_driver(&winbond_spi_driver);
}

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("Winbond SPI Flash Driver");

module_init(winbond_spi_init);
module_exit(winbond_spi_exit);

在该驱动程序中，probe函数用于初始化SPI总线并读取Winbond Flash的ID。在remove函数中，您可以清理和释放设备资源。

需要注意的是，驱动程序中的设备树配置和平台驱动程序名称需要匹配。在本例中，设备树中的节点名称为“winbond-spi-flash”，而平台驱动程序的名称为“winbond-spi-flash”。