u-boot device_0f_to_plat函数

 

 //

//递归函数来设定设备dev的数据，

1. 分配设备的私有数据

 

int device_of_to_plat(struct udevice *dev)

{

    const struct driver *drv;

    int ret;

    if (!dev)

        return -EINVAL;

    if (dev_get_flags(dev) & DM_FLAG_PLATDATA_VALID)

        return 0;

    /*

     * This is not needed if binding is disabled, since data is allocated

     * at build time.

     */

    if (!CONFIG_IS_ENABLED(OF_PLATDATA_NO_BIND)) {

        /* Ensure all parents have ofdata */

        if (dev->parent) {

            ret = device_of_to_plat(dev->parent);

            if (ret)

                goto fail;

            /*

             * The device might have already been probed during

             * the call to device_probe() on its parent device

             * (e.g. PCI bridge devices). Test the flags again

             * so that we don't mess up the device.

             */

            if (dev_get_flags(dev) & DM_FLAG_PLATDATA_VALID)

                return 0;

        }

//设定设备dev的私有数据

        ret = device_alloc_priv(dev);

        if (ret)

            goto fail;

    }

    drv = dev->driver;

    assert(drv);

 

//调用设备驱动程序的操作of_to_plat

    if (drv->of_to_plat &&

        (CONFIG_IS_ENABLED(OF_PLATDATA) || dev_has_ofnode(dev))) {

        ret = drv->of_to_plat(dev);

        if (ret)

            goto fail;

    }

 

//设定设备dev的flag

    dev_or_flags(dev, DM_FLAG_PLATDATA_VALID);

    return 0;

fail:

    device_free(dev);

    return ret;

}