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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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