netdev - 32-bit Amlogic SoCs: avoid using Ethernet MAC addresses

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Message-ID: <CAFBinCDRKJS-RXgVBDo2gjp_bU8Wmbhr+HGXNad4vCFyrvN_HA@mail.gmail.com>
Date:   Sun, 24 Feb 2019 21:55:09 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     linux.amoon@...il.com, linux-amlogic@...ts.infradead.org
Cc:     netdev@...r.kernel.org
Subject: 32-bit Amlogic SoCs: avoid using Ethernet MAC addresses

I have seen Anand's your question in [0]:
> only issue is I have is the each time their is random MAC address so I
> get new IP from dhcp server.
> How can I avoid this. I have tried to enable eFuse driver but with no success.

u-boot on the 64-bit SoCs can read the MAC address from the eFuse and
pass it (via the .dtb) to the kernel.
This requires an ethernet0 alias in the mainline .dts though, see [1]
for and example.

I'm not sure if this also works with the older u-boot on the 32-bit SoCs.
if it doesn't then there's a nvmem-cells binding for all Ethernet
controllers: [2] (please note that the function implementing this
binding was recently renamed: [3])
as far as I can tell the stmmac driver doesn't support the nvmem-cells
based binding yet

Anand, if you want to work on this: feel free to do so!
I have the SDHC MMC driver and a discussion about the power-domain
drivers on my TODO-list, so I'm pretty busy at the moment.

Regards
Martin

[0] http://lists.infradead.org/pipermail/linux-amlogic/2019-February/010464.html
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f7c36209c46c4d162202b65eed2e66962ad8c3c1
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9217e566bdee4583d0a9ea4879c8f5e004886eac
[3] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=afa64a72b862a7a9d04f8d07fba632eaf06b23f8