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bcm53xx: MR32: read mac-address from eeprom

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Meraki wrote the ethernet MAC-address of the device
onto the eeprom (AT24C64) at the fixed location 0x66
to 0x6C. Let's fetch it from there.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
This commit is contained in:
Christian Lamparter 2021-09-18 16:41:41 +02:00
parent fd67908647
commit 608baf44c6
2 changed files with 46 additions and 4 deletions
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4
target/linux/bcm53xx/base-files/etc/board.d/02_network
View File

@ -94,10 +94,6 @@ bcm53xx_setup_macs()
# As vendor doesn't use eth0 its MAC may be missing. Use one from eth2.
et2macaddr="$(nvram get et2macaddr)"
;;
meraki,mr32)
# The MAC is stored on an AT24C64 eeprom and not on the nvram
et2macaddr=$(get_mac_binary "/sys/bus/i2c/devices/0-0050/eeprom" 0x66)
;;
esac
[ -n "$et2macaddr" ] && ucidef_set_interface_macaddr "lan" "$et2macaddr"

46
target/linux/bcm53xx/patches-5.10/099-net-bcma-handle-deferred-probe.patch Normal file
View File

@ -0,0 +1,46 @@
From 029497e66bdc762e001880e4c85a91f35a54b1e2 Mon Sep 17 00:00:00 2001
From: Christian Lamparter <chunkeey@gmail.com>
Date: Sun, 19 Sep 2021 13:57:25 +0200
Subject: net: bgmac-bcma: handle deferred probe error due to mac-address
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Due to the inclusion of nvmem handling into the mac-address getter
function of_get_mac_address() by
commit d01f449c008a ("of_net: add NVMEM support to of_get_mac_address")
it is now possible to get a -EPROBE_DEFER return code. Which did cause
bgmac to assign a random ethernet address.
This exact issue happened on my Meraki MR32. The nvmem provider is
an EEPROM (at24c64) which gets instantiated once the module
driver is loaded... This happens once the filesystem becomes available.
With this patch, bgmac_probe() will propagate the -EPROBE_DEFER error.
Then the driver subsystem will reschedule the probe at a later time.
Cc: Petr Štetiar <ynezz@true.cz>
Cc: Michael Walle <michael@walle.cc>
Fixes: d01f449c008a ("of_net: add NVMEM support to of_get_mac_address")
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/ethernet/broadcom/bgmac-bcma.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/net/ethernet/broadcom/bgmac-bcma.c b/drivers/net/ethernet/broadcom/bgmac-bcma.c
index 85fa0ab7201c7..9513cfb5ba58c 100644
--- a/drivers/net/ethernet/broadcom/bgmac-bcma.c
+++ b/drivers/net/ethernet/broadcom/bgmac-bcma.c
@@ -129,6 +129,8 @@ static int bgmac_probe(struct bcma_device *core)
bcma_set_drvdata(core, bgmac);
err = of_get_mac_address(bgmac->dev->of_node, bgmac->net_dev->dev_addr);
+ if (err == -EPROBE_DEFER)
+ return err;
/* If no MAC address assigned via device tree, check SPROM */
if (err) {
--
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