target/linux/ramips/patches-3.14/0034-NET-add-of_get_mac_address_mtd.patch

   1 From 92f38460229a8816404408f036f0a374f1013d0e Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Sun, 27 Jul 2014 09:40:01 +0100
   4 Subject: [PATCH 34/57] NET: add of_get_mac_address_mtd()
   5
   6 Many embedded devices have information such as mac addresses stored inside mtd
   7 devices. This patch allows us to add a property inside a node describing a
   8 network interface. The new property points at a mtd partition with an offset
   9 where the mac address can be found.
  10
  11 Signed-off-by: John Crispin <blogic@openwrt.org>
  12 ---
  13  drivers/of/of_net.c    |   37 +++++++++++++++++++++++++++++++++++++
  14  include/linux/of_net.h |    1 +
  15  2 files changed, 38 insertions(+)
  16
  17 --- a/drivers/of/of_net.c
  18 +++ b/drivers/of/of_net.c
  19 @@ -10,6 +10,7 @@
  20  #include <linux/of_net.h>
  21  #include <linux/phy.h>
  22  #include <linux/export.h>
  23 +#include <linux/mtd/mtd.h>
  24
  25  /**
  26   * It maps 'enum phy_interface_t' found in include/linux/phy.h
  27 @@ -94,3 +95,39 @@ const void *of_get_mac_address(struct de
  28         return NULL;
  29  }
  30  EXPORT_SYMBOL(of_get_mac_address);
  31 +
  32 +int of_get_mac_address_mtd(struct device_node *np, void *mac)
  33 +{
  34 +       struct device_node *mtd_np = NULL;
  35 +       size_t retlen;
  36 +       int size, ret;
  37 +       struct mtd_info *mtd;
  38 +       const char *part;
  39 +       const __be32 *list;
  40 +       phandle phandle;
  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, (u_char *) mac);
  62 +       put_mtd_device(mtd);
  63 +
  64 +       return ret;
  65 +}
  66 +EXPORT_SYMBOL_GPL(of_get_mac_address_mtd);
  67 --- a/include/linux/of_net.h
  68 +++ b/include/linux/of_net.h
  69 @@ -11,6 +11,7 @@
  70  #include <linux/of.h>
  71  extern int of_get_phy_mode(struct device_node *np);
  72  extern const void *of_get_mac_address(struct device_node *np);
  73 +extern int of_get_mac_address_mtd(struct device_node *np, void *mac);
  74  #else
  75  static inline int of_get_phy_mode(struct device_node *np)
  76  {