[Task]: Improve code for meson-gxm-c400-plus.dtb

[jomadeto]

Task description

With default meson-gxm-q201.dts in linux kernel code ethernet and wifi works, only need to add bluetooth driver. But in armbian the patch "meson-gxl-gxm-arm64-dts-meson-set-p212-p23x-q20x-SDIO-to-100MH.patch" broke wifi, more exactly the problem is increase to 100MH in the file "/arch/arm64/boot/dts/amlogic/meson-gx-p23x-q20x.dtsi", the line "max-frequency = <100000000>;". If revert this line to "max-frequency = <50000000>;" wifi works perfect.

In my actual code take the meson-gxm-q201.dts base, add bluetooth driver and duplicate all the code of "/* Wireless SDIO Module */" reverting only "max-frequency = <50000000>;", but all the rest of the code is duplicated.

I'm trying to change the code for not duplicate the code:

• Try to add a new patch for partialy revert previous patch. But this patch affect all the dtbs that uses meson-gx-p23x-q20x.dtsi so this is not the solution.
• Actually are testing removing the line "#include "meson-gx-p23x-q20x.dtsi"" in meson-gxm-c400-plus.dts and manually adding and adapting all the code in patched meson-gx-p23x-q20x.dtsi (present in folder /build/cache/sources/linux-kernel-worktree/meson64__arm64/arch/arm64/boot/dts/amlogic), in theory must work, but in the future need to manually add all new patches added to meson-gx-p23x-q20x.dtsi.

I think that the better option is keep #include "meson-gx-p23x-q20x.dtsi" in meson-gxm-c400-plus.dts, remove duplicated "/* Wireless SDIO Module */" and make a patch that revert max-frequency = <100000000>; to max-frequency = <50000000>; only when build aml-c400-plus, but don't know how to do this, don't know if somebody can help me will be apreciated.

Sorry for my bad english.

[github-actions]

Jira ticket: AR-2582