target/linux/generic/patches-4.1/681-NET-add-of_get_mac_address_mtd.patch

   1 From: John Crispin <blogic@openwrt.org>
   2 Date: Sun, 27 Jul 2014 09:40:01 +0100
   3 Subject: NET: add of_get_mac_address_mtd()
   4
   5 Many embedded devices have information such as mac addresses stored inside mtd
   6 devices. This patch allows us to add a property inside a node describing a
   7 network interface. The new property points at a mtd partition with an offset
   8 where the mac address can be found.
   9
  10 Signed-off-by: John Crispin <blogic@openwrt.org>
  11 ---
  12  drivers/of/of_net.c    |   37 +++++++++++++++++++++++++++++++++++++
  13  include/linux/of_net.h |    1 +
  14  2 files changed, 38 insertions(+)
  15
  16 --- a/drivers/of/of_net.c
  17 +++ b/drivers/of/of_net.c
  18 @@ -10,6 +10,7 @@
  19  #include <linux/of_net.h>
  20  #include <linux/phy.h>
  21  #include <linux/export.h>
  22 +#include <linux/mtd/mtd.h>
  23
  24  /**
  25   * of_get_phy_mode - Get phy mode for given device_node
  26 @@ -80,3 +81,39 @@ const void *of_get_mac_address(struct de
  27         return of_get_mac_addr(np, "address");
  28  }
  29  EXPORT_SYMBOL(of_get_mac_address);
  30 +
  31 +int of_get_mac_address_mtd(struct device_node *np, void *mac)
  32 +{
  33 +       struct device_node *mtd_np = NULL;
  34 +       size_t retlen;
  35 +       int size, ret;
  36 +       struct mtd_info *mtd;
  37 +       const char *part;
  38 +       const __be32 *list;
  39 +       phandle phandle;
  40 +
  41 +       list = of_get_property(np, "mtd-mac-address", &size);
  42 +       if (!list || (size != (2 * sizeof(*list))))
  43 +               return -ENOENT;
  44 +
  45 +       phandle = be32_to_cpup(list++);
  46 +       if (phandle)
  47 +               mtd_np = of_find_node_by_phandle(phandle);
  48 +
  49 +       if (!mtd_np)
  50 +               return -ENOENT;
  51 +
  52 +       part = of_get_property(mtd_np, "label", NULL);
  53 +       if (!part)
  54 +               part = mtd_np->name;
  55 +
  56 +       mtd = get_mtd_device_nm(part);
  57 +       if (IS_ERR(mtd))
  58 +               return PTR_ERR(mtd);
  59 +
  60 +       ret = mtd_read(mtd, be32_to_cpup(list), 6, &retlen, (u_char *) mac);
  61 +       put_mtd_device(mtd);
  62 +
  63 +       return ret;
  64 +}
  65 +EXPORT_SYMBOL_GPL(of_get_mac_address_mtd);
  66 --- a/include/linux/of_net.h
  67 +++ b/include/linux/of_net.h
  68 @@ -13,6 +13,7 @@
  69  struct net_device;
  70  extern int of_get_phy_mode(struct device_node *np);
  71  extern const void *of_get_mac_address(struct device_node *np);
  72 +extern int of_get_mac_address_mtd(struct device_node *np, void *mac);
  73  extern struct net_device *of_find_net_device_by_node(struct device_node *np);
  74  #else
  75  static inline int of_get_phy_mode(struct device_node *np)