Merge branch 'net-ethernet-mtk_eth_soc-improve-device-tree-handling'

Daniel Golle says:

====================
net: ethernet: mtk_eth_soc: improve device tree handling

This series further improves the mtk_eth_soc driver in preparation to
complete upstream support for the MediaTek MT7988 SoC family.

Frank Wunderlich's previous attempt to have the ethernet node included
in mt7988a.dtsi and cover support for MT7988 in the device tree bindings
was criticized for the way mtk_eth_soc references SRAM in device tree[1].

Having a 2nd 'reg' property, like introduced by commit ebb1e4f9
("net: ethernet: mtk_eth_soc: add support for in-SoC SRAM") isn't
acceptable and a dedicated "mmio-sram" node should be used instead.

In order to make the code more clean and readable, the existing
hardcoded offsets for the scratch ring, RX and TX rings are dropped in
favor of using the generic allocator. However, support for the hardcoded
offset of the SRAM itself being included as part of the Ethernet's "reg"
MMIO space is kept as it will still be required in order to support
existing legacy device trees of the MT7986 SoC family.

While at it also replace confusing error messages when using legacy
device trees without "interrupt-names" with a warning informing users
that they are using a legacy device tree.

[1]: https://patchwork.ozlabs.org/comment/3533543/
====================

Link: https://patch.msgid.link/cover.1751461762.git.daniel@makrotopia.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>