cd39aba402
The label-mac logic relies on the mac-address property of a netdev devices of-node. However, the mac address can also be stored as a different property or read from e.g. an mtd device. Create this node when reading a mac-address from OF if it does not already exist and copy the mac-address used for the device to this property. This way, the MAC address can be accessed using procfs. Signed-off-by: David Bauer <mail@david-bauer.net>
114 lines
3.2 KiB
Diff
114 lines
3.2 KiB
Diff
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(-)
|
|
|
|
--- 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 *
|
|
}
|
|
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 +79,55 @@ static const void *of_get_mac_addr_nvmem
|
|
return mac;
|
|
}
|
|
|
|
+static const void *of_get_mac_address_mtd(struct device_node *np)
|
|
+{
|
|
+#ifdef CONFIG_MTD
|
|
+ struct platform_device *pdev = of_find_device_by_node(np);
|
|
+ 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 = devm_kmemdup(&pdev->dev, mac, ETH_ALEN, GFP_KERNEL);
|
|
+ if (!addr)
|
|
+ return ERR_PTR(-ENOMEM);
|
|
+
|
|
+ return addr;
|
|
+#endif
|
|
+}
|
|
+
|
|
+
|
|
/**
|
|
* 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 +148,10 @@ static const void *of_get_mac_addr_nvmem
|
|
* 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.
|
|
+ *
|
|
* 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 +170,10 @@ const void *of_get_mac_address(struct de
|
|
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);
|