drivers/staging/board/board.c

   1 #include <linux/init.h>
   2 #include <linux/device.h>
   3 #include <linux/kernel.h>
   4 #include <linux/of.h>
   5 #include <linux/of_address.h>
   6 #include "board.h"
   7
   8 static bool find_by_address(u64 base_address)
   9 {
  10         struct device_node *dn = of_find_all_nodes(NULL);
  11         struct resource res;
  12
  13         while (dn) {
  14                 if (of_can_translate_address(dn)
  15                     && !of_address_to_resource(dn, 0, &res)) {
  16                         if (res.start == base_address) {
  17                                 of_node_put(dn);
  18                                 return true;
  19                         }
  20                 }
  21                 dn = of_find_all_nodes(dn);
  22         }
  23
  24         return false;
  25 }
  26
  27 bool __init board_staging_dt_node_available(const struct resource *resource,
  28                                             unsigned int num_resources)
  29 {
  30         unsigned int i;
  31
  32         for (i = 0; i < num_resources; i++) {
  33                 const struct resource *r = resource + i;
  34
  35                 if (resource_type(r) == IORESOURCE_MEM)
  36                         if (find_by_address(r->start))
  37                                 return true; /* DT node available */
  38         }
  39
  40         return false; /* Nothing found */
  41 }