1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Copyright (C) 2016 Google, Inc 4 * Written by Simon Glass <sjg@chromium.org> 5 */ 6 7#include <common.h> 8#include <errno.h> 9#include <image.h> 10#include <log.h> 11#include <linux/libfdt.h> 12 13ulong fdt_getprop_u32(const void *fdt, int node, const char *prop) 14{ 15 const u32 *cell; 16 int len; 17 18 cell = fdt_getprop(fdt, node, prop, &len); 19 if (!cell || len != sizeof(*cell)) 20 return FDT_ERROR; 21 22 return fdt32_to_cpu(*cell); 23} 24 25__weak int board_fit_config_name_match(const char *name) 26{ 27 return -EINVAL; 28} 29 30/* 31 * Iterate over all /configurations subnodes and call a platform specific 32 * function to find the matching configuration. 33 * Returns the node offset or a negative error number. 34 */ 35int fit_find_config_node(const void *fdt) 36{ 37 const char *name; 38 int conf, node, len; 39 const char *dflt_conf_name; 40 const char *dflt_conf_desc = NULL; 41 int dflt_conf_node = -ENOENT; 42 43 conf = fdt_path_offset(fdt, FIT_CONFS_PATH); 44 if (conf < 0) { 45 debug("%s: Cannot find /configurations node: %d\n", __func__, 46 conf); 47 return -EINVAL; 48 } 49 50 dflt_conf_name = fdt_getprop(fdt, conf, "default", &len); 51 52 for (node = fdt_first_subnode(fdt, conf); 53 node >= 0; 54 node = fdt_next_subnode(fdt, node)) { 55 name = fdt_getprop(fdt, node, "description", &len); 56 if (!name) { 57#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT 58 printf("%s: Missing FDT description in DTB\n", 59 __func__); 60#endif 61 return -EINVAL; 62 } 63 64 if (dflt_conf_name) { 65 const char *node_name = fdt_get_name(fdt, node, NULL); 66 if (strcmp(dflt_conf_name, node_name) == 0) { 67 dflt_conf_node = node; 68 dflt_conf_desc = name; 69 } 70 } 71 72 if (board_fit_config_name_match(name)) 73 continue; 74 75 debug("Selecting config '%s'\n", name); 76 77 return node; 78 } 79 80 if (dflt_conf_node != -ENOENT) { 81 debug("Selecting default config '%s'\n", dflt_conf_desc); 82 return dflt_conf_node; 83 } 84 85 return -ENOENT; 86} 87