u-boot lists_bind_fdt函数

函数位置driver/core/lists.c文件

int lists_bind_fdt(struct udevice *parent, ofnode node, struct udevice **devp,
           bool pre_reloc_only)
{
    struct driver *driver = ll_entry_start(struct driver, driver);
    const int n_ents = ll_entry_count(struct driver, driver);
    const struct udevice_id *id;
    struct driver *entry;
    struct udevice *dev;
    bool found = false;
    const char *name, *compat_list, *compat;
    int compat_length, i;
    int result = 0;
    int ret = 0;
//链表添加的父节点是root
    if (devp)
        *devp = NULL;
//获得节点的名称
    name = ofnode_get_name(node);
    log_debug("bind node %s\n", name);
//获得节点属性compatible的属性列表指针和长度
    compat_list = ofnode_get_property(node, "compatible", &compat_length);
//无compatible属性返回处理
    if (!compat_list) {
        if (compat_length == -FDT_ERR_NOTFOUND) {
            log_debug("Device '%s' has no compatible string\n",
                  name);
            return 0;
        }

        dm_warn("Device tree error at node '%s'\n", name);
        return compat_length;
    }

    /*
     * Walk through the compatible string list, attempting to match each
     * compatible string in order such that we match in order of priority
     * from the first string to the last.
     */
//compatible属性匹配

    for (i = 0; i < compat_length; i += strlen(compat) + 1) {
        compat = compat_list + i;
        log_debug("   - attempt to match compatible string '%s'\n",
              compat);

        for (entry = driver; entry != driver + n_ents; entry++) {
            ret = driver_check_compatible(entry->of_match, &id,
                              compat);
            if (!ret)
                break;
        }
        if (entry == driver + n_ents)
            continue;
//判断是否预先加载：1，pre_reloc_only为真，直接加载。2，fdt节点属性设置
        if (pre_reloc_only) {
            if (!ofnode_pre_reloc(node) &&
                !(entry->flags & DM_FLAG_PRE_RELOC)) {
                log_debug("Skipping device pre-relocation\n");
                return 0;
            }
        }

        log_debug("   - found match at '%s': '%s' matches '%s'\n",
              entry->name, entry->of_match->compatible,
              id->compatible);
        ret = device_bind_with_driver_data(parent, entry, name,
                           id->data, node, &dev);
        if (ret == -ENODEV) {
            log_debug("Driver '%s' refuses to bind\n", entry->name);
            continue;
        }
        if (ret) {
            dm_warn("Error binding driver '%s': %d\n", entry->name,
                ret);
            return log_msg_ret("bind", ret);
        } else {
            found = true;
            if (devp)
                *devp = dev;
        }
        break;
    }

    if (!found && !result && ret != -ENODEV)
        log_debug("No match for node '%s'\n", name);

    return result;
}

标签：compat,name,bind,boot,driver,ret,compatible,fdt,entry
来源： https://www.cnblogs.com/liujunhuasd/p/15914863.html