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samsung-gt58/gt510: Move to community

Administrator requested to merge gt5-community into master

Move Samsung Galaxy Tab A (2015) devices to community.

Those two tablets are very similar with primary differences being the display and some parts of sound.
(gt58 uses more "phone-like" sound with an earpiece so it shares similarity with a2015 phones in this regard)

I was using gt510 myself for about half a year and other than some quirks it is extremely usable and could even replace me a laptop in some cases.

Notable quirks:

  • Charger ic has no driver so both devices may not charge unless they were plugged in when turning on (then bootloader configures charging) Fuelgauge works well and is even aware of the current going to the battery. (however charging status will remain "Unknown" until a real charger driver exists to indicate otherwise)
  • As on most (all?) devices that control brightness via DSI, the panel video data gets corrupted on brightness changes. Workaround is to turn the screen off and on after changing brightness.
  • On gt510 voice calls are only possible via headphones as there is no earpiece and the speaker uses external amplifier which requires different software configuration. (But do you really want to use 10 inch tablet to talk via the speaker?)

Please note that those ports are covering both WIFI and LTE variants using the kernel selection:

  • Users who have WIFI variant or LTE variant but wish to have modem disabled can choose mainline kernel as those tablets are absolutely similar other than by modem firmware and the existence of cellular radio.
  • Users who have LTE variant and wish to have modem enabled should choose mainline-modem-lte kernel. This kernel has additional -lte suffix because on wifi variants modem can also be enabled to get GPS working but the sound routing must be different without call audio support. However this was not investigated well yet so we don't support GPS on WiFi variants at this time. We can add -modem-wifi kernel later should the need arise.

Prior also means that prebuilt images should be built for both kernels as -lte kernel shouldn't be used on wifi variants.

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