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path: root/drivers/of/of_net.c
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Diffstat (limited to 'drivers/of/of_net.c')
-rw-r--r--drivers/of/of_net.c54
1 files changed, 51 insertions, 3 deletions
diff --git a/drivers/of/of_net.c b/drivers/of/of_net.c
index d820f3edd431..9649cd53e955 100644
--- a/drivers/of/of_net.c
+++ b/drivers/of/of_net.c
@@ -8,8 +8,10 @@
#include <linux/etherdevice.h>
#include <linux/kernel.h>
#include <linux/of_net.h>
+#include <linux/of_platform.h>
#include <linux/phy.h>
#include <linux/export.h>
+#include <linux/device.h>
/**
* of_get_phy_mode - Get phy mode for given device_node
@@ -47,12 +49,52 @@ static const void *of_get_mac_addr(struct device_node *np, const char *name)
return NULL;
}
+static const void *of_get_mac_addr_nvmem(struct device_node *np)
+{
+ int ret;
+ u8 mac[ETH_ALEN];
+ struct property *pp;
+ struct platform_device *pdev = of_find_device_by_node(np);
+
+ if (!pdev)
+ return ERR_PTR(-ENODEV);
+
+ ret = nvmem_get_mac_address(&pdev->dev, &mac);
+ if (ret)
+ return ERR_PTR(ret);
+
+ pp = devm_kzalloc(&pdev->dev, sizeof(*pp), GFP_KERNEL);
+ if (!pp)
+ return ERR_PTR(-ENOMEM);
+
+ pp->name = "nvmem-mac-address";
+ pp->length = ETH_ALEN;
+ pp->value = devm_kmemdup(&pdev->dev, mac, ETH_ALEN, GFP_KERNEL);
+ if (!pp->value) {
+ ret = -ENOMEM;
+ goto free;
+ }
+
+ ret = of_add_property(np, pp);
+ if (ret)
+ goto free;
+
+ return pp->value;
+free:
+ devm_kfree(&pdev->dev, pp->value);
+ devm_kfree(&pdev->dev, pp);
+
+ return ERR_PTR(ret);
+}
+
/**
* 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
* address. If that isn't set, then 'local-mac-address' is checked next,
- * because that is the default address. If that isn't set, then the obsolete
- * 'address' is checked, just in case we're using an old device tree.
+ * because that is the default address. If that isn't set, then the obsolete
+ * 'address' is checked, just in case we're using an old device tree. If any
+ * of the above isn't set, then try to get MAC address from nvmem cell named
+ * 'mac-address'.
*
* Note that the 'address' property is supposed to contain a virtual address of
* the register set, but some DTS files have redefined that property to be the
@@ -64,6 +106,8 @@ static const void *of_get_mac_addr(struct device_node *np, const char *name)
* addresses. Some older U-Boots only initialized 'local-mac-address'. In
* this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
* but is all zeros.
+ *
+ * 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)
{
@@ -77,6 +121,10 @@ const void *of_get_mac_address(struct device_node *np)
if (addr)
return addr;
- return of_get_mac_addr(np, "address");
+ addr = of_get_mac_addr(np, "address");
+ if (addr)
+ return addr;
+
+ return of_get_mac_addr_nvmem(np);
}
EXPORT_SYMBOL(of_get_mac_address);