103 lines
2.8 KiB
Diff
103 lines
2.8 KiB
Diff
From 6f8e5369ae054ec6c9265581d5a7e39738a5cd84 Mon Sep 17 00:00:00 2001
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From: Ansuel Smith <ansuelsmth@gmail.com>
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Date: Tue, 30 Mar 2021 13:16:38 +0200
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Subject: [PATCH 1/2] NET: add mtd-mac-address support to of_get_mac_address()
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Many embedded devices have information such as mac addresses stored inside mtd
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devices. This patch allows us to add a property inside a node describing a
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network interface. The new property points at a mtd partition with an offset
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where the mac address can be found.
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Signed-off-by: John Crispin <blogic@openwrt.org>
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
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---
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drivers/of/of_net.c | 75 ++++++++++++++++++++++++++++++++++++++++++++-
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1 file changed, 74 insertions(+), 1 deletion(-)
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--- a/drivers/of/of_net.c
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+++ b/drivers/of/of_net.c
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@@ -12,6 +12,7 @@
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#include <linux/export.h>
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#include <linux/device.h>
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#include <linux/nvmem-consumer.h>
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+#include <linux/mtd/mtd.h>
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/**
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* of_get_phy_mode - Get phy mode for given device_node
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@@ -95,6 +96,52 @@ static int of_get_mac_addr_nvmem(struct
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return 0;
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}
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+static int of_get_mac_address_mtd(struct device_node *np, u8 *addr)
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+{
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+#ifdef CONFIG_MTD
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+ struct platform_device *pdev = of_find_device_by_node(np);
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+ struct device_node *mtd_np = NULL;
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+ size_t retlen;
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+ int size, ret;
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+ struct mtd_info *mtd;
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+ const char *part;
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+ const __be32 *list;
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+ phandle phandle;
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+ u8 mac[ETH_ALEN];
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+
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+ list = of_get_property(np, "mtd-mac-address", &size);
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+ if (!list || (size != (2 * sizeof(*list))))
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+ return -ENODEV;
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+
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+ phandle = be32_to_cpup(list++);
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+ if (phandle)
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+ mtd_np = of_find_node_by_phandle(phandle);
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+
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+ if (!mtd_np)
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+ return -ENODEV;
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+
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+ part = of_get_property(mtd_np, "label", NULL);
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+ if (!part)
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+ part = mtd_np->name;
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+
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+ mtd = get_mtd_device_nm(part);
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+ if (IS_ERR(mtd))
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+ return -ENODEV;
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+
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+ ret = mtd_read(mtd, be32_to_cpup(list), 6, &retlen, mac);
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+ put_mtd_device(mtd);
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+
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+ if (!is_valid_ether_addr(mac))
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+ return -EINVAL;
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+
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+ memcpy(addr, mac, ETH_ALEN);
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+
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+ return 0;
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+#endif
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+ return -EINVAL;
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+}
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+
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+
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/**
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* Search the device tree for the best MAC address to use. 'mac-address' is
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* checked first, because that is supposed to contain to "most recent" MAC
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@@ -115,6 +162,10 @@ static int of_get_mac_addr_nvmem(struct
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* this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
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* but is all zeros.
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*
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+ *
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+ * If a mtd-mac-address property exists, try to fetch the MAC address from the
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+ * specified mtd device.
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+ *
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* Return: 0 on success and errno in case of error.
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*/
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int of_get_mac_address(struct device_node *np, u8 *addr)
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@@ -136,6 +187,10 @@ int of_get_mac_address(struct device_nod
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if (!ret)
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return 0;
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+ ret = of_get_mac_address_mtd(np, addr);
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+ if (!ret)
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+ return 0;
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+
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return of_get_mac_addr_nvmem(np, addr);
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}
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EXPORT_SYMBOL(of_get_mac_address);
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