kernel/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_address_to_resource(dn, 0, &res)) {
  15                         if (res.start == base_address) {
  16                                 of_node_put(dn);
  17                                 return true;
  18                         }
  19                 }
  20                 dn = of_find_all_nodes(dn);
  21         }
  22
  23         return false;
  24 }
  25
  26 bool __init board_staging_dt_node_available(const struct resource *resource,
  27                                             unsigned int num_resources)
  28 {
  29         unsigned int i;
  30
  31         for (i = 0; i < num_resources; i++) {
  32                 const struct resource *r = resource + i;
  33
  34                 if (resource_type(r) == IORESOURCE_MEM)
  35                         if (find_by_address(r->start))
  36                                 return true; /* DT node available */
  37         }
  38
  39         return false; /* Nothing found */
  40 }