diff options
Diffstat (limited to 'target/linux/generic/pending-5.4/681-NET-add-mtd-mac-address-support-to-of_get_mac_addres.patch')
| -rw-r--r-- | target/linux/generic/pending-5.4/681-NET-add-mtd-mac-address-support-to-of_get_mac_addres.patch | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/target/linux/generic/pending-5.4/681-NET-add-mtd-mac-address-support-to-of_get_mac_addres.patch b/target/linux/generic/pending-5.4/681-NET-add-mtd-mac-address-support-to-of_get_mac_addres.patch new file mode 100644 index 0000000000..44a6b6a047 --- /dev/null +++ b/target/linux/generic/pending-5.4/681-NET-add-mtd-mac-address-support-to-of_get_mac_addres.patch @@ -0,0 +1,134 @@ +From 6f8e5369ae054ec6c9265581d5a7e39738a5cd84 Mon Sep 17 00:00:00 2001 +From: Ansuel Smith <ansuelsmth@gmail.com> +Date: Tue, 30 Mar 2021 13:16:38 +0200 +Subject: [PATCH 1/2] NET: add mtd-mac-address support to of_get_mac_address() + +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> +Signed-off-by: Felix Fietkau <nbd@nbd.name> +Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com> +--- + drivers/of/of_net.c | 75 ++++++++++++++++++++++++++++++++++++++++++++- + 1 file changed, 74 insertions(+), 1 deletion(-) + +diff --git a/drivers/of/of_net.c b/drivers/of/of_net.c +index 6e411821583e..f072e2509cc9 100644 +--- a/drivers/of/of_net.c ++++ b/drivers/of/of_net.c +@@ -11,6 +11,7 @@ + #include <linux/phy.h> + #include <linux/export.h> + #include <linux/device.h> ++#include <linux/mtd/mtd.h> + + /** + * of_get_phy_mode - Get phy mode for given device_node +@@ -45,7 +46,7 @@ int of_get_phy_mode(struct device_node *np, phy_interface_t *interface) + } + EXPORT_SYMBOL_GPL(of_get_phy_mode); + +-static const void *of_get_mac_addr(struct device_node *np, const char *name) ++static void *of_get_mac_addr(struct device_node *np, const char *name) + { + struct property *pp = of_find_property(np, name, NULL); + +@@ -78,6 +79,70 @@ static const void *of_get_mac_addr_nvmem(struct device_node *np) + return mac; + } + ++static const void *of_get_mac_address_mtd(struct device_node *np) ++{ ++#ifdef CONFIG_MTD ++ struct device_node *mtd_np = NULL; ++ struct property *prop; ++ size_t retlen; ++ int size, ret; ++ struct mtd_info *mtd; ++ const char *part; ++ const __be32 *list; ++ phandle phandle; ++ u8 mac[ETH_ALEN]; ++ void *addr; ++ ++ list = of_get_property(np, "mtd-mac-address", &size); ++ if (!list || (size != (2 * sizeof(*list)))) ++ return NULL; ++ ++ phandle = be32_to_cpup(list++); ++ if (phandle) ++ mtd_np = of_find_node_by_phandle(phandle); ++ ++ if (!mtd_np) ++ return NULL; ++ ++ 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 NULL; ++ ++ ret = mtd_read(mtd, be32_to_cpup(list), 6, &retlen, mac); ++ put_mtd_device(mtd); ++ ++ if (!is_valid_ether_addr(mac)) ++ return NULL; ++ ++ addr = of_get_mac_addr(np, "mac-address"); ++ if (addr) { ++ memcpy(addr, mac, ETH_ALEN); ++ return addr; ++ } ++ ++ prop = kzalloc(sizeof(*prop), GFP_KERNEL); ++ if (!prop) ++ return NULL; ++ ++ prop->name = "mac-address"; ++ prop->length = ETH_ALEN; ++ prop->value = kmemdup(mac, ETH_ALEN, GFP_KERNEL); ++ if (!prop->value || of_add_property(np, prop)) ++ goto free; ++ ++ return prop->value; ++free: ++ kfree(prop->value); ++ kfree(prop); ++#endif ++ return NULL; ++} ++ ++ + /** + * Search the device tree for the best MAC address to use. 'mac-address' is + * checked first, because that is supposed to contain to "most recent" MAC +@@ -98,6 +163,10 @@ static const void *of_get_mac_addr_nvmem(struct device_node *np) + * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists + * but is all zeros. + * ++ * ++ * If a mtd-mac-address property exists, try to fetch the MAC address from the ++ * specified mtd device, and store it as a 'mac-address' property ++ * + * Return: Will be a valid pointer on success and ERR_PTR in case of error. + */ + const void *of_get_mac_address(struct device_node *np) +@@ -116,6 +185,10 @@ const void *of_get_mac_address(struct device_node *np) + if (addr) + return addr; + ++ addr = of_get_mac_address_mtd(np); ++ if (addr) ++ return addr; ++ + return of_get_mac_addr_nvmem(np); + } + EXPORT_SYMBOL(of_get_mac_address); +-- +2.30.2 + |