From 92f38460229a8816404408f036f0a374f1013d0e Mon Sep 17 00:00:00 2001 From: John Crispin Date: Sun, 27 Jul 2014 09:40:01 +0100 Subject: [PATCH 34/57] 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 --- drivers/of/of_net.c | 37 +++++++++++++++++++++++++++++++++++++ include/linux/of_net.h | 1 + 2 files changed, 38 insertions(+) diff --git a/drivers/of/of_net.c b/drivers/of/of_net.c index a208a45..de93111 100644 --- a/drivers/of/of_net.c +++ b/drivers/of/of_net.c @@ -10,6 +10,7 @@ #include #include #include +#include /** * It maps 'enum phy_interface_t' found in include/linux/phy.h @@ -94,3 +95,39 @@ const void *of_get_mac_address(struct device_node *np) return NULL; } EXPORT_SYMBOL(of_get_mac_address); + +int of_get_mac_address_mtd(struct device_node *np, void *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; + + 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, (u_char *) mac); + put_mtd_device(mtd); + + return ret; +} +EXPORT_SYMBOL_GPL(of_get_mac_address_mtd); diff --git a/include/linux/of_net.h b/include/linux/of_net.h index 34597c8..cdfbc60 100644 --- a/include/linux/of_net.h +++ b/include/linux/of_net.h @@ -11,6 +11,7 @@ #include extern int of_get_phy_mode(struct device_node *np); extern const void *of_get_mac_address(struct device_node *np); +extern int of_get_mac_address_mtd(struct device_node *np, void *mac); #else static inline int of_get_phy_mode(struct device_node *np) { -- 1.7.10.4