uboot 设备树scan

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drivers/core/root.c

int dm_init_and_scan(bool pre_reloc_only){ int ret;
 ret = dm_init(); if (ret) {  debug("dm_init() failed: %d\n", ret);  return ret; } ret = dm_scan_platdata(pre_reloc_only); if (ret) {  debug("dm_scan_platdata() failed: %d\n", ret);  return ret; }
 if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {  ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only);  if (ret) {   debug("dm_scan_fdt() failed: %d\n", ret);   return ret;  } }
 ret = dm_scan_other(pre_reloc_only); if (ret)  return ret;
 return 0;}

int dm_init(void){ int ret;
 if (gd->dm_root) {  dm_warn("Virtual root driver already exists!\n");  return -EINVAL; } INIT_LIST_HEAD(&DM_UCLASS_ROOT_NON_CONST);
#if defined(CONFIG_NEEDS_MANUAL_RELOC) fix_drivers(); fix_uclass(); fix_devices();#endif
 ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST); if (ret)  return ret;#if CONFIG_IS_ENABLED(OF_CONTROL) DM_ROOT_NON_CONST->of_offset = 0;#endif ret = device_probe(DM_ROOT_NON_CONST); if (ret)  return ret;
 return 0;}

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