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