orangepizero2w: fix ethernet using sunxi-gmac driver

[EvilOlaf]

Description

Micha did some cleanup after my mess with the sunxi patchset. Well, it is what it is when no professional wants to tackle an issue but leave it to an amateur like myself to do it 😁 . Anyway below is the commit message.

It is patched into Armbian kernel sources, and was enabled in Linux 6.12, but has not been enabled anymore with Linux 6.18 and above.

Additionally, a possible attempt to split the AC200 related patch ended up with half of sunxi-gmac dependencies missing, including such which are explicitly enabled in defconfs, including e.g. CONFIG_AC200_PHY_SUNXI.

The mainline driver dwmac-sun8i, that might have been seen as possible replacement for sunxi-gmac, does not support the Ethernet chip of the Orange Pi Zero 2W expansion board yet.

How Has This Been Tested?

• build sunxi/sunxi64
• boot orangepizero2 (H616) edge, ethernet works https://paste.armbian.com/ducapenibu
• boot orangepizero (H2+) current, ethernet works https://paste.armbian.com/umarimutuv (not because it is even affected, just because I can)
• boot orangepioneplus (H6) current, ethernet works https://paste.armbian.com/benupejuli

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

Summary by CodeRabbit

Release Notes

• New Features
  • Added support for the AC200 mixed-signal device, enabling audio codec and Ethernet PHY functionality
  • Enabled GMAC network driver for improved Ethernet support
  • Updated kernel driver integration across multiple kernel versions (6.18 and 7.0)

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR adds kernel network driver configuration and device support for two distinct components: the SUNXI GMAC Ethernet driver is enabled as a loadable module in current and edge kernel configurations, while support for the X-Powers AC200 mixed-signal chip (with MFD core, Ethernet PHY, and codec capability) is added via new driver patches for both the 6.18 and 7.0 kernel archives.

Changes

SUNXI GMAC Ethernet Driver Enablement

Layer / File(s)	Summary
GMAC driver module configuration config/kernel/linux-sunxi64-current.config, config/kernel/linux-sunxi64-edge.config	CONFIG_SUNXI_GMAC is enabled as a loadable module in both current and edge kernel configurations, placed in the network device driver section.

AC200 Mixed-Signal Chip Driver Support

Layer / File(s)	Summary
AC200 MFD core driver (Kernel 6.18) patch/kernel/archive/sunxi-6.18/patches.armbian/0201-drv-mfd-ac200-add-support.patch	Adds MFD Kconfig option MFD_AC200 and core I2C driver that initializes the AC200 regmap, manages clock and NVMEM bandgap values, and registers child devices (codec, EPHY control).
AC200 Ethernet PHY driver (Kernel 6.18) patch/kernel/archive/sunxi-6.18/patches.armbian/0202-drv-net-phy-ac200-ephy-add.patch	Adds AC200_PHY Kconfig option and PHY driver with config_init register programming, optional clock acquisition, and standard suspend/resume handlers.
Kernel 6.18 patch series reorganization patch/kernel/archive/sunxi-6.18/series.conf	Removes numbered patch references (0201/0202) and adds drv-mfd-ac200-add-support.patch with a new networking stmmac patch in the Armbian driver block.
AC200 MFD core driver (Kernel 7.0) patch/kernel/archive/sunxi-7.0/patches.armbian/0201-drv-mfd-ac200-add-support.patch	Adds MFD Kconfig option MFD_AC200 and core I2C driver; identical in functionality to the 6.18 version.
AC200 Ethernet PHY driver (Kernel 7.0) patch/kernel/archive/sunxi-7.0/patches.armbian/0202-drv-net-phy-ac200-ephy-add.patch	Adds AC200_PHY Kconfig option and PHY driver; identical in functionality to the 6.18 version.
Kernel 7.0 patch series reorganization patch/kernel/archive/sunxi-7.0/series.conf	Removes numbered patch references (0201/0202) and adds drv-mfd-ac200-add-support.patch while replacing an existing stmmac patch with drv-net-stmmac-sun8i-add-h618-emac.patch.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related issues

• [Bug]: Some sunxi boards require the GMAC driver that was dropped from the kernel #9814: Re-enables the SUNXI GMAC kernel driver (CONFIG_SUNXI_GMAC) as a module, directly addressing the reported issue about the driver being removed while still being required by certain sunxi boards.

Poem

🐰 A rabbit hops through kernel trees,
Where GMAC flows on Ethernet breeze,
AC200 chips now join the song,
With patches new and drivers strong!
hop hop ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly and specifically identifies the main change: enabling the sunxi-gmac driver to fix Ethernet support for Orange Pi Zero 2W, which aligns with the core purpose of the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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