When downloading the firmware for this router on their website, I saw GPL code. So I downloaded it, and it has openwrt folder in it. I wonder how hard it is to support it if they already has the source for it?
That, by itself doesn't mean anything and won't help you.
It depends entirely on the given hardware (primarily SOC, switch, wlan, amount of flash/ RAM) and how hard the vendor wants to make it for you (secure boot, signed firmwares, etc.), as well as your own developer abilities to write the necessary patches.
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Go figure - mips32 kmods, some with lantiq written over
Lantiq as we know it (vr9) is not fast enough to drive 802.11ax wireless cards, but that spec would match grx350 (unsupported SOC and unsupported WLAN).
tplink may display boot log - set log level to maximum and after reboot check logs in web interface, something starting at "Linux version 3.10" should show hardware initialization process, including list thereof.