common/common_fit.c

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