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- From 6f8e5369ae054ec6c9265581d5a7e39738a5cd84 Mon Sep 17 00:00:00 2001
- From: Ansuel Smith <[email protected]>
- 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 <[email protected]>
- Signed-off-by: Felix Fietkau <[email protected]>
- Signed-off-by: Ansuel Smith <[email protected]>
- ---
- 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
- @@ -12,6 +12,7 @@
- #include <linux/export.h>
- #include <linux/device.h>
- #include <linux/nvmem-consumer.h>
- +#include <linux/mtd/mtd.h>
-
- /**
- * of_get_phy_mode - Get phy mode for given device_node
- @@ -89,6 +90,52 @@ static int of_get_mac_addr_nvmem(struct
- return 0;
- }
-
- +static int of_get_mac_address_mtd(struct device_node *np, u8 *addr)
- +{
- +#ifdef CONFIG_MTD
- + struct platform_device *pdev = of_find_device_by_node(np);
- + struct device_node *mtd_np = NULL;
- + size_t retlen;
- + int size, ret;
- + struct mtd_info *mtd;
- + const char *part;
- + const __be32 *list;
- + phandle phandle;
- + u8 mac[ETH_ALEN];
- +
- + list = of_get_property(np, "mtd-mac-address", &size);
- + if (!list || (size != (2 * sizeof(*list))))
- + return -ENODEV;
- +
- + phandle = be32_to_cpup(list++);
- + if (phandle)
- + mtd_np = of_find_node_by_phandle(phandle);
- +
- + if (!mtd_np)
- + return -ENODEV;
- +
- + 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 -ENODEV;
- +
- + ret = mtd_read(mtd, be32_to_cpup(list), 6, &retlen, mac);
- + put_mtd_device(mtd);
- +
- + if (!is_valid_ether_addr(mac))
- + return -EINVAL;
- +
- + memcpy(addr, mac, ETH_ALEN);
- +
- + return 0;
- +#endif
- + return -EINVAL;
- +}
- +
- +
- /**
- * 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
- @@ -109,6 +156,10 @@ static int of_get_mac_addr_nvmem(struct
- * 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: 0 on success and errno in case of error.
- */
- int of_get_mac_address(struct device_node *np, u8 *addr)
- @@ -130,6 +181,10 @@ int of_get_mac_address(struct device_nod
- if (!ret)
- return 0;
-
- + ret = of_get_mac_address_mtd(np, addr);
- + if (!ret)
- + return 0;
- +
- return of_get_mac_addr_nvmem(np, addr);
- }
- EXPORT_SYMBOL(of_get_mac_address);
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