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 +81,43 @@ 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, unsigned char *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 +       u32 mac_inc = 0;
  41 +
  42 +       list = of_get_property(np, "mtd-mac-address", &size);
  43 +       if (!list || (size != (2 * sizeof(*list))))
  44 +               return -ENOENT;
  45 +
  46 +       phandle = be32_to_cpup(list++);
  47 +       if (phandle)
  48 +               mtd_np = of_find_node_by_phandle(phandle);
  49 +
  50 +       if (!mtd_np)
  51 +               return -ENOENT;
  52 +
  53 +       part = of_get_property(mtd_np, "label", NULL);
  54 +       if (!part)
  55 +               part = mtd_np->name;
  56 +
  57 +       mtd = get_mtd_device_nm(part);
  58 +       if (IS_ERR(mtd))
  59 +               return PTR_ERR(mtd);
  60 +
  61 +       ret = mtd_read(mtd, be32_to_cpup(list), 6, &retlen, mac);
  62 +       put_mtd_device(mtd);
  63 +
  64 +       if (!of_property_read_u32(np, "mtd-mac-address-increment", &mac_inc))
  65 +               mac[5] += mac_inc;
  66 +
  67 +       return ret;
  68 +}
  69 +EXPORT_SYMBOL_GPL(of_get_mac_address_mtd);
  70 --- a/include/linux/of_net.h
  71 +++ b/include/linux/of_net.h
  72 @@ -13,6 +13,7 @@
  73  struct net_device;
  74  extern int of_get_phy_mode(struct device_node *np);
  75  extern const void *of_get_mac_address(struct device_node *np);
  76 +extern int of_get_mac_address_mtd(struct device_node *np, unsigned char *mac);
  77  extern struct net_device *of_find_net_device_by_node(struct device_node *np);
  78  #else
  79  static inline int of_get_phy_mode(struct device_node *np)