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From: John Crispin <blogic@openwrt.org>
Date: Sun, 27 Jul 2014 09:40:01 +0100
Subject: NET: add of_get_mac_address_mtd()
Many embedded devices have information such as mac addresses stored inside mtd
devices. This patch allows us to add a property inside a node describing a
network interface. The new property points at a mtd partition with an offset
where the mac address can be found.
Signed-off-by: John Crispin <blogic@openwrt.org>
---
drivers/of/of_net.c | 37 +++++++++++++++++++++++++++++++++++++
include/linux/of_net.h | 1 +
2 files changed, 38 insertions(+)
--- a/drivers/of/of_net.c
+++ b/drivers/of/of_net.c
@@ -10,6 +10,7 @@
#include <linux/of_net.h>
#include <linux/phy.h>
#include <linux/export.h>
+#include <linux/mtd/mtd.h>
/**
* of_get_phy_mode - Get phy mode for given device_node
@@ -75,3 +76,45 @@ const void *of_get_mac_address(struct de
return NULL;
}
EXPORT_SYMBOL(of_get_mac_address);
+
+#ifdef CONFIG_MTD
+int of_get_mac_address_mtd(struct device_node *np, unsigned char *mac)
+{
+ struct device_node *mtd_np = NULL;
+ size_t retlen;
+ int size, ret;
+ struct mtd_info *mtd;
+ const char *part;
+ const __be32 *list;
+ phandle phandle;
+ u32 mac_inc = 0;
+
+ list = of_get_property(np, "mtd-mac-address", &size);
+ if (!list || (size != (2 * sizeof(*list))))
+ return -ENOENT;
+
+ phandle = be32_to_cpup(list++);
+ if (phandle)
+ mtd_np = of_find_node_by_phandle(phandle);
+
+ if (!mtd_np)
+ return -ENOENT;
+
+ part = of_get_property(mtd_np, "label", NULL);
+ if (!part)
+ part = mtd_np->name;
+
+ mtd = get_mtd_device_nm(part);
+ if (IS_ERR(mtd))
+ return PTR_ERR(mtd);
+
+ ret = mtd_read(mtd, be32_to_cpup(list), 6, &retlen, mac);
+ put_mtd_device(mtd);
+
+ if (!of_property_read_u32(np, "mtd-mac-address-increment", &mac_inc))
+ mac[5] += mac_inc;
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(of_get_mac_address_mtd);
+#endif
--- a/include/linux/of_net.h
+++ b/include/linux/of_net.h
@@ -11,6 +11,14 @@
#include <linux/of.h>
extern int of_get_phy_mode(struct device_node *np);
extern const void *of_get_mac_address(struct device_node *np);
+#ifdef CONFIG_MTD
+extern int of_get_mac_address_mtd(struct device_node *np, unsigned char *mac);
+#else
+static inline int of_get_mac_address_mtd(struct device_node *np, unsigned char *mac)
+{
+ return -ENOENT;
+}
+#endif
#else
static inline int of_get_phy_mode(struct device_node *np)
{
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