From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
Many non-DT platforms read the MAC address from EEPROM. Usually it's
either done with callbacks defined in board files or from SoC-specific
ethernet drivers.
In order to generalize this, try to read the MAC from nvmem in
eth_platform_get_mac_address() using a standard lookup name:
"mac-address".
Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
---
net/ethernet/eth.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 39af03894598..af3b4b1b77eb 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -54,6 +54,7 @@
#include <linux/if_ether.h>
#include <linux/of_net.h>
#include <linux/pci.h>
+#include <linux/nvmem-consumer.h>
#include <net/dst.h>
#include <net/arp.h>
#include <net/sock.h>
@@ -527,8 +528,11 @@ unsigned char * __weak arch_get_platform_mac_address(void)
int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr)
{
+ unsigned char addrbuf[ETH_ALEN];
const unsigned char *addr;
+ struct nvmem_cell *nvmem;
struct device_node *dp;
+ size_t alen;
if (dev_is_pci(dev))
dp = pci_device_to_OF_node(to_pci_dev(dev));
@@ -541,6 +545,29 @@ int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr)
if (!addr)
addr = arch_get_platform_mac_address();
+ if (!addr) {
+ nvmem = nvmem_cell_get(dev, "mac-address");
+ if (IS_ERR(nvmem) && PTR_ERR(nvmem) == -EPROBE_DEFER)
+ /* We may have a lookup registered for MAC address but
+ * the corresponding nvmem provider hasn't been
+ * registered yet.
+ */
+ return -EPROBE_DEFER;
+
+ if (!IS_ERR(nvmem)) {
+ addr = nvmem_cell_read(nvmem, &alen);
+ if (!IS_ERR(addr)) {
+ if (alen == ETH_ALEN)
+ ether_addr_copy(addrbuf, addr);
+
+ kfree(addr);
+ addr = alen == ETH_ALEN ? addrbuf : NULL;
+ }
+
+ nvmem_cell_put(nvmem);
+ }
+ }
+
if (!addr || !is_valid_ether_addr(addr))
return -ENODEV;
--
2.17.1
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